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zhaijia pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/bookkeeper.git


The following commit(s) were added to refs/heads/master by this push:
     new 257c216  ISSUE #230: Enable checkstyle for more packages
257c216 is described below

commit 257c21630ab93b6adccbf955899451bd550a1d07
Author: Aaron Coburn <acob...@amherst.edu>
AuthorDate: Sat Dec 2 19:47:01 2017 +0800

    ISSUE #230: Enable checkstyle for more packages
    
    Part of #230, this enables the checkstyle plugin for the `replication` and
    `server.http.service` packages.
    
    Descriptions of the changes in this PR:
    
    Most of the changes here are merely cosmetic. The only change of any 
significance is in the `RecoveryBookieService.RecoveryRequestJsonBody` class in 
which the JSON object fields had to be changed in order to conform to the 
Checkstyle rules: `bookie_src` to `bookieSrc` and `delete_cookie` to 
`deleteCookie`. Using a Jackson annotation (`JsonProperty`), however, means 
that these field names continue to be parsed and serialized as `bookie_src` and 
`delete_cookie`, respectively.
    
    Author: Jia Zhai <jiaz...@users.noreply.github.com>
    Author: Aaron Coburn <acob...@amherst.edu>
    
    Reviewers: Jia Zhai <None>, Sijie Guo <si...@apache.org>
    
    This closes #800 from acoburn/checkstyle_replication, closes #230
---
 .../org/apache/bookkeeper/replication/Auditor.java | 68 +++++++++++-----------
 .../bookkeeper/replication/AuditorElector.java     | 39 ++++++-------
 .../bookkeeper/replication/AutoRecoveryMain.java   | 16 ++---
 .../replication/BookieLedgerIndexer.java           |  3 +-
 .../replication/ReplicationEnableCb.java           |  4 +-
 .../replication/ReplicationException.java          |  6 +-
 .../bookkeeper/replication/ReplicationStats.java   | 45 +++++++-------
 .../bookkeeper/replication/ReplicationWorker.java  | 54 +++++++++--------
 .../bookkeeper/replication/package-info.java       | 23 ++++++++
 .../server/http/service/ConfigurationService.java  |  9 +--
 .../server/http/service/DecommissionService.java   |  6 +-
 .../server/http/service/DeleteLedgerService.java   |  5 +-
 .../server/http/service/ExpandStorageService.java  |  7 ++-
 .../server/http/service/GetLastLogMarkService.java | 13 +++--
 .../server/http/service/GetLedgerMetaService.java  |  4 +-
 .../server/http/service/ListBookieInfoService.java |  9 ++-
 .../server/http/service/ListBookiesService.java    | 19 +++---
 .../server/http/service/ListDiskFilesService.java  | 24 ++++----
 .../server/http/service/ListLedgerService.java     | 31 +++++-----
 .../service/ListUnderReplicatedLedgerService.java  |  9 ++-
 .../service/LostBookieRecoveryDelayService.java    |  8 ++-
 .../http/service/ReadLedgerEntryService.java       |  9 +--
 .../server/http/service/RecoveryBookieService.java | 30 ++++++----
 .../server/http/service/TriggerAuditService.java   |  5 +-
 .../server/http/service/WhoIsAuditorService.java   |  7 ++-
 .../resources/bookkeeper/server-suppressions.xml   |  2 -
 26 files changed, 260 insertions(+), 195 deletions(-)

diff --git 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/Auditor.java
 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/Auditor.java
index 7a10e0b..778ce8a 100644
--- 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/Auditor.java
+++ 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/Auditor.java
@@ -24,6 +24,7 @@ import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.Stopwatch;
 import com.google.common.collect.Sets;
 import com.google.common.util.concurrent.SettableFuture;
+
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collection;
@@ -37,6 +38,7 @@ import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.ThreadFactory;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicInteger;
+
 import org.apache.bookkeeper.client.BKException;
 import org.apache.bookkeeper.client.BookKeeper;
 import org.apache.bookkeeper.client.BookKeeperAdmin;
@@ -96,7 +98,7 @@ public class Auditor {
     private volatile Future<?> auditTask;
     private Set<String> bookiesToBeAudited = Sets.newHashSet();
     private volatile int lostBookieRecoveryDelayBeforeChange;
-    
+
     public Auditor(final String bookieIdentifier, ServerConfiguration conf,
                    ZooKeeper zkc, StatsLogger statsLogger) throws 
UnavailableException {
         this.conf = conf;
@@ -141,7 +143,8 @@ public class Auditor {
 
             ClientConfiguration clientConfiguration = new 
ClientConfiguration(conf);
             
clientConfiguration.setClientRole(ClientConfiguration.CLIENT_ROLE_SYSTEM);
-            LOG.info("AuthProvider used by the Auditor is 
"+clientConfiguration.getClientAuthProviderFactoryClass());
+            LOG.info("AuthProvider used by the Auditor is {}",
+                    clientConfiguration.getClientAuthProviderFactoryClass());
             this.bkc = new BookKeeper(clientConfiguration, zkc);
             this.admin = new BookKeeperAdmin(bkc, statsLogger);
             if (this.ledgerUnderreplicationManager
@@ -149,8 +152,8 @@ public class Auditor {
                 LOG.info("Initializing lostBookieRecoveryDelay zNode to the 
conif value: {}",
                         conf.getLostBookieRecoveryDelay());
             } else {
-                LOG.info(
-                        "Valid lostBookieRecoveryDelay zNode is available, so 
not creating lostBookieRecoveryDelay zNode as part of Auditor initialization ");
+                LOG.info("Valid lostBookieRecoveryDelay zNode is available, so 
not creating "
+                        + "lostBookieRecoveryDelay zNode as part of Auditor 
initialization ");
             }
             lostBookieRecoveryDelayBeforeChange = 
this.ledgerUnderreplicationManager.getLostBookieRecoveryDelay();
         } catch (CompatibilityException ce) {
@@ -229,9 +232,10 @@ public class Auditor {
                         }
                         if (bookiesToBeAudited.size() > 1) {
                             // if more than one bookie is down, start the 
audit immediately;
-                            LOG.info("Multiple bookie failure; not delaying 
bookie audit. Bookies lost now: "
-                                     + CollectionUtils.subtract(knownBookies, 
availableBookies)
-                                     +"; All lost bookies: " + 
bookiesToBeAudited.toString());
+                            LOG.info("Multiple bookie failure; not delaying 
bookie audit. "
+                                    + "Bookies lost now: {}; All lost bookies: 
{}",
+                                    CollectionUtils.subtract(knownBookies, 
availableBookies),
+                                    bookiesToBeAudited);
                             if (auditTask != null && auditTask.cancel(false)) {
                                 auditTask = null;
                                 numDelayedBookieAuditsCancelled.inc();
@@ -242,7 +246,7 @@ public class Auditor {
                         }
                         if (auditTask == null) {
                             // if there is no scheduled audit, schedule one
-                            auditTask = executor.schedule( new Runnable() {
+                            auditTask = executor.schedule(new Runnable() {
                                 public void run() {
                                     startAudit(false);
                                     auditTask = null;
@@ -250,8 +254,8 @@ public class Auditor {
                                 }
                             }, lostBookieRecoveryDelay, TimeUnit.SECONDS);
                             numBookieAuditsDelayed.inc();
-                            LOG.info("Delaying bookie audit by " + 
lostBookieRecoveryDelay
-                                     + "secs for " + 
bookiesToBeAudited.toString());
+                            LOG.info("Delaying bookie audit by {} secs for 
{}", lostBookieRecoveryDelay,
+                                    bookiesToBeAudited);
                         }
                     } catch (BKException bke) {
                         LOG.error("Exception getting bookie list", bke);
@@ -282,7 +286,7 @@ public class Auditor {
                     // after new lostBookieRecoveryDelay period
                     if (auditTask != null) {
                         LOG.info("lostBookieRecoveryDelay period has been 
changed so canceling the pending AuditTask");
-                        auditTask.cancel(false);                        
+                        auditTask.cancel(false);
                         numDelayedBookieAuditsCancelled.inc();
                     }
 
@@ -291,12 +295,13 @@ public class Auditor {
                     if ((lostBookieRecoveryDelay == 0)
                             || (lostBookieRecoveryDelay == 
lostBookieRecoveryDelayBeforeChange)) {
                         LOG.info(
-                                "lostBookieRecoveryDelay has been set to 0 or 
reset to its previos value, so starting AuditTask. "
-                                + "Current lostBookieRecoveryDelay: {}, 
previous lostBookieRecoveryDelay: {}",
+                                "lostBookieRecoveryDelay has been set to 0 or 
reset to its previous value, "
+                                + "so starting AuditTask. Current 
lostBookieRecoveryDelay: {}, "
+                                + "previous lostBookieRecoveryDelay: {}",
                                 lostBookieRecoveryDelay, 
lostBookieRecoveryDelayBeforeChange);
                         startAudit(false);
                         auditTask = null;
-                        bookiesToBeAudited.clear();                        
+                        bookiesToBeAudited.clear();
                     } else if (auditTask != null) {
                         LOG.info("lostBookieRecoveryDelay has been set to {}, 
so rescheduling AuditTask accordingly",
                                 lostBookieRecoveryDelay);
@@ -308,13 +313,13 @@ public class Auditor {
                             }
                         }, lostBookieRecoveryDelay, TimeUnit.SECONDS);
                         numBookieAuditsDelayed.inc();
-                    }                    
+                    }
                 } catch (InterruptedException ie) {
                     Thread.currentThread().interrupt();
                     LOG.error("Interrupted while for LedgersReplication to be 
enabled ", ie);
                 } catch (UnavailableException ue) {
                     LOG.error("Exception while reading from ZK", ue);
-                } finally{
+                } finally {
                     if (lostBookieRecoveryDelay != -1) {
                         lostBookieRecoveryDelayBeforeChange = 
lostBookieRecoveryDelay;
                     }
@@ -362,8 +367,7 @@ public class Auditor {
                             } catch (IOException ioe) {
                                 LOG.error("I/O exception running periodic 
check", ioe);
                             } catch (ReplicationException.UnavailableException 
ue) {
-                                LOG.error("Underreplication manager 
unavailable "
-                                          +"running periodic check", ue);
+                                LOG.error("Underreplication manager 
unavailable running periodic check", ue);
                             }
                         }
                     }, interval, interval, TimeUnit.SECONDS);
@@ -377,7 +381,7 @@ public class Auditor {
                 LOG.error("Couldn't get bookie list, exiting", bke);
                 submitShutdownTask();
             }
-            
+
             try {
                 this.ledgerUnderreplicationManager
                         .notifyLostBookieRecoveryDelayChanged(new 
LostBookieRecoveryDelayChangedCb());
@@ -389,11 +393,11 @@ public class Auditor {
             long bookieCheckInterval = 
conf.getAuditorPeriodicBookieCheckInterval();
             if (bookieCheckInterval == 0) {
                 LOG.info("Auditor periodic bookie checking disabled, running 
once check now anyhow");
-                executor.submit(BOOKIE_CHECK);
+                executor.submit(bookieCheck);
             } else {
                 LOG.info("Auditor periodic bookie checking enabled"
                          + " 'auditorPeriodicBookieCheckInterval' {} seconds", 
bookieCheckInterval);
-                executor.scheduleAtFixedRate(BOOKIE_CHECK, 0, 
bookieCheckInterval, TimeUnit.SECONDS);
+                executor.scheduleAtFixedRate(bookieCheck, 0, 
bookieCheckInterval, TimeUnit.SECONDS);
             }
         }
     }
@@ -410,7 +414,7 @@ public class Auditor {
             Auditor.this.submitLostBookieRecoveryDelayChangedEvent();
         }
     }
-    
+
     private void waitIfLedgerReplicationDisabled() throws UnavailableException,
             InterruptedException {
         ReplicationEnableCb cb = new ReplicationEnableCb();
@@ -439,7 +443,7 @@ public class Auditor {
     }
 
     /**
-     * Start running the actual audit task
+     * Start running the actual audit task.
      *
      * @param shutDownTask
      *      A boolean that indicates whether or not to schedule shutdown task 
on any failure
@@ -482,7 +486,7 @@ public class Auditor {
             if (!ledgerUnderreplicationManager.isLedgerReplicationEnabled()) {
                 // has been disabled while we were generating the index
                 // discard this run, and schedule a new one
-                executor.submit(BOOKIE_CHECK);
+                executor.submit(bookieCheck);
                 return;
             }
         } catch (UnavailableException ue) {
@@ -529,11 +533,10 @@ public class Auditor {
         if (null == ledgers || ledgers.size() == 0) {
             // there is no ledgers available for this bookie and just
             // ignoring the bookie failures
-            LOG.info("There is no ledgers for the failed bookie: " + bookieIP);
+            LOG.info("There is no ledgers for the failed bookie: {}", 
bookieIP);
             return;
         }
-        LOG.info("Following ledgers: " + ledgers + " of bookie: " + bookieIP
-                + " are identified as underreplicated");
+        LOG.info("Following ledgers: {} of bookie: {} are identified as 
underreplicated", ledgers, bookieIP);
         numUnderReplicatedLedger.registerSuccessfulValue(ledgers.size());
         for (Long ledgerId : ledgers) {
             try {
@@ -548,7 +551,7 @@ public class Auditor {
     }
 
     /**
-     * Process the result returned from checking a ledger
+     * Process the result returned from checking a ledger.
      */
     private class ProcessLostFragmentsCb implements 
GenericCallback<Set<LedgerFragment>> {
         final LedgerHandle lh;
@@ -625,8 +628,7 @@ public class Auditor {
                             return;
                         }
                     } catch (ReplicationException.UnavailableException ue) {
-                        LOG.error("Underreplication manager unavailable "
-                                  +"running periodic check", ue);
+                        LOG.error("Underreplication manager unavailable 
running periodic check", ue);
                         processDone.countDown();
                         return;
                     }
@@ -699,7 +701,7 @@ public class Auditor {
     }
 
     /**
-     * Shutdown the auditor
+     * Shutdown the auditor.
      */
     public void shutdown() {
         LOG.info("Shutting down auditor");
@@ -721,7 +723,7 @@ public class Auditor {
     }
 
     /**
-     * Return true if auditor is running otherwise return false
+     * Return true if auditor is running otherwise return false.
      *
      * @return auditor status
      */
@@ -729,7 +731,7 @@ public class Auditor {
         return !executor.isShutdown();
     }
 
-    private final Runnable BOOKIE_CHECK = new Runnable() {
+    private final Runnable bookieCheck = new Runnable() {
             public void run() {
                 if (auditTask == null) {
                     startAudit(true);
diff --git 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/AuditorElector.java
 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/AuditorElector.java
index fe6c10b..aca74c5 100644
--- 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/AuditorElector.java
+++ 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/AuditorElector.java
@@ -20,44 +20,43 @@
  */
 package org.apache.bookkeeper.replication;
 
+import static com.google.common.base.Charsets.UTF_8;
+import static 
org.apache.bookkeeper.replication.ReplicationStats.ELECTION_ATTEMPTS;
+
+import com.google.common.annotations.VisibleForTesting;
+import com.google.protobuf.TextFormat;
+
+import java.io.IOException;
+import java.io.Serializable;
 import java.util.Collections;
 import java.util.Comparator;
 import java.util.List;
-import java.io.Serializable;
-import java.io.IOException;
-
-import org.apache.bookkeeper.proto.DataFormats.AuditorVoteFormat;
-import com.google.common.annotations.VisibleForTesting;
-import java.util.concurrent.Executors;
 import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
 import java.util.concurrent.ThreadFactory;
 import java.util.concurrent.atomic.AtomicBoolean;
 
-import org.apache.bookkeeper.net.BookieSocketAddress;
 import org.apache.bookkeeper.conf.ServerConfiguration;
+import org.apache.bookkeeper.net.BookieSocketAddress;
+import org.apache.bookkeeper.proto.DataFormats.AuditorVoteFormat;
 import 
org.apache.bookkeeper.replication.ReplicationException.UnavailableException;
 import org.apache.bookkeeper.stats.Counter;
 import org.apache.bookkeeper.stats.NullStatsLogger;
 import org.apache.bookkeeper.stats.StatsLogger;
 import org.apache.bookkeeper.util.BookKeeperConstants;
+import org.apache.bookkeeper.util.ZkUtils;
 import org.apache.commons.lang.StringUtils;
 import org.apache.zookeeper.CreateMode;
 import org.apache.zookeeper.KeeperException;
 import org.apache.zookeeper.WatchedEvent;
 import org.apache.zookeeper.Watcher;
-import org.apache.zookeeper.ZooKeeper;
 import org.apache.zookeeper.Watcher.Event.EventType;
 import org.apache.zookeeper.Watcher.Event.KeeperState;
-import com.google.protobuf.TextFormat;
-import static com.google.common.base.Charsets.UTF_8;
-
+import org.apache.zookeeper.ZooKeeper;
+import org.apache.zookeeper.data.ACL;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import static 
org.apache.bookkeeper.replication.ReplicationStats.ELECTION_ATTEMPTS;
-import org.apache.bookkeeper.util.ZkUtils;
-import org.apache.zookeeper.data.ACL;
-
 /**
  * Performing auditor election using Apache ZooKeeper. Using ZooKeeper as a
  * coordination service, when a bookie bids for auditor, it creates an 
ephemeral
@@ -97,7 +96,7 @@ public class AuditorElector {
 
 
     /**
-     * AuditorElector for performing the auditor election
+     * AuditorElector for performing the auditor election.
      *
      * @param bookieId
      *            - bookie identifier, comprises HostAddress:Port
@@ -114,7 +113,7 @@ public class AuditorElector {
     }
 
     /**
-     * AuditorElector for performing the auditor election
+     * AuditorElector for performing the auditor election.
      *
      * @param bookieId
      *            - bookie identifier, comprises HostAddress:Port
@@ -141,7 +140,7 @@ public class AuditorElector {
         executor = Executors.newSingleThreadExecutor(new ThreadFactory() {
                 @Override
                 public Thread newThread(Runnable r) {
-                    return new Thread(r, "AuditorElector-"+bookieId);
+                    return new Thread(r, "AuditorElector-" + bookieId);
                 }
             });
     }
@@ -310,7 +309,7 @@ public class AuditorElector {
     }
 
     /**
-     * Query zookeeper for the currently elected auditor
+     * Query zookeeper for the currently elected auditor.
      * @return the bookie id of the current auditor
      */
     public static BookieSocketAddress getCurrentAuditor(ServerConfiguration 
conf, ZooKeeper zk)
@@ -335,7 +334,7 @@ public class AuditorElector {
     }
 
     /**
-     * Shutting down AuditorElector
+     * Shutting down AuditorElector.
      */
     public void shutdown() throws InterruptedException {
         synchronized (this) {
diff --git 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/AutoRecoveryMain.java
 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/AutoRecoveryMain.java
index c818c62..d25e4d3 100644
--- 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/AutoRecoveryMain.java
+++ 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/AutoRecoveryMain.java
@@ -20,21 +20,26 @@
  */
 package org.apache.bookkeeper.replication;
 
+import static org.apache.bookkeeper.replication.ReplicationStats.AUDITOR_SCOPE;
+import static 
org.apache.bookkeeper.replication.ReplicationStats.REPLICATION_WORKER_SCOPE;
+
 import com.google.common.annotations.VisibleForTesting;
+
 import java.io.File;
 import java.io.IOException;
 import java.net.MalformedURLException;
 import java.util.HashSet;
 import java.util.Set;
+
 import org.apache.bookkeeper.bookie.Bookie;
 import org.apache.bookkeeper.bookie.BookieCriticalThread;
 import org.apache.bookkeeper.bookie.ExitCode;
 import org.apache.bookkeeper.conf.ServerConfiguration;
-import org.apache.bookkeeper.server.http.BKHttpServiceProvider;
 import org.apache.bookkeeper.http.HttpServer;
 import org.apache.bookkeeper.http.HttpServerLoader;
 import 
org.apache.bookkeeper.replication.ReplicationException.CompatibilityException;
 import 
org.apache.bookkeeper.replication.ReplicationException.UnavailableException;
+import org.apache.bookkeeper.server.http.BKHttpServiceProvider;
 import org.apache.bookkeeper.stats.NullStatsLogger;
 import org.apache.bookkeeper.stats.StatsLogger;
 import org.apache.bookkeeper.zookeeper.ZooKeeperClient;
@@ -51,11 +56,8 @@ import org.apache.zookeeper.ZooKeeper;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import static org.apache.bookkeeper.replication.ReplicationStats.AUDITOR_SCOPE;
-import static 
org.apache.bookkeeper.replication.ReplicationStats.REPLICATION_WORKER_SCOPE;
-
 /**
- * Class to start/stop the AutoRecovery daemons Auditor and ReplicationWorker
+ * Class to start/stop the AutoRecovery daemons Auditor and ReplicationWorker.
  */
 public class AutoRecoveryMain {
     private static final Logger LOG = LoggerFactory
@@ -107,8 +109,8 @@ public class AutoRecoveryMain {
         deathWatcher = new AutoRecoveryDeathWatcher(this);
     }
 
-    public AutoRecoveryMain(ServerConfiguration conf, ZooKeeper zk) throws 
IOException, InterruptedException, KeeperException,
-            UnavailableException, CompatibilityException {
+    public AutoRecoveryMain(ServerConfiguration conf, ZooKeeper zk) throws 
IOException, InterruptedException,
+           KeeperException, UnavailableException, CompatibilityException {
         this.conf = conf;
         this.zk = zk;
         auditorElector = new 
AuditorElector(Bookie.getBookieAddress(conf).toString(), conf, zk);
diff --git 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/BookieLedgerIndexer.java
 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/BookieLedgerIndexer.java
index e28137e..b7b4285 100644
--- 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/BookieLedgerIndexer.java
+++ 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/BookieLedgerIndexer.java
@@ -61,8 +61,7 @@ public class BookieLedgerIndexer {
     public Map<String, Set<Long>> getBookieToLedgerIndex()
             throws BKAuditException {
         // bookie vs ledgers map
-        final ConcurrentHashMap<String, Set<Long>> bookie2ledgersMap
-            = new ConcurrentHashMap<String, Set<Long>>();
+        final ConcurrentHashMap<String, Set<Long>> bookie2ledgersMap = new 
ConcurrentHashMap<String, Set<Long>>();
         final CountDownLatch ledgerCollectorLatch = new CountDownLatch(1);
 
         Processor<Long> ledgerProcessor = new Processor<Long>() {
diff --git 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/ReplicationEnableCb.java
 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/ReplicationEnableCb.java
index b50927c..36672b3 100644
--- 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/ReplicationEnableCb.java
+++ 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/ReplicationEnableCb.java
@@ -27,7 +27,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 /**
- * Callback which is getting notified when the replication process is enabled
+ * Callback which is getting notified when the replication process is enabled.
  */
 public class ReplicationEnableCb implements GenericCallback<Void> {
 
@@ -45,7 +45,7 @@ public class ReplicationEnableCb implements 
GenericCallback<Void> {
 
     /**
      * This is a blocking call and causes the current thread to wait until the
-     * replication process is enabled
+     * replication process is enabled.
      *
      * @throws InterruptedException
      *             interrupted while waiting
diff --git 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/ReplicationException.java
 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/ReplicationException.java
index 2ff7b94..1afee69 100644
--- 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/ReplicationException.java
+++ 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/ReplicationException.java
@@ -19,7 +19,7 @@
 package org.apache.bookkeeper.replication;
 
 /**
- * Exceptions for use within the replication service
+ * Exceptions for use within the replication service.
  */
 public abstract class ReplicationException extends Exception {
     protected ReplicationException(String message, Throwable cause) {
@@ -31,7 +31,7 @@ public abstract class ReplicationException extends Exception {
     }
 
     /**
-     * The replication service has become unavailable
+     * The replication service has become unavailable.
      */
     public static class UnavailableException extends ReplicationException {
         private static final long serialVersionUID = 31872209L;
@@ -62,7 +62,7 @@ public abstract class ReplicationException extends Exception {
     }
 
     /**
-     * Exception while auditing bookie-ledgers
+     * Exception while auditing bookie-ledgers.
     */
     public static class BKAuditException extends ReplicationException {
         private static final long serialVersionUID = 95551905L;
diff --git 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/ReplicationStats.java
 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/ReplicationStats.java
index 0b48e33..4f48b78 100644
--- 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/ReplicationStats.java
+++ 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/ReplicationStats.java
@@ -20,31 +20,34 @@
  */
 package org.apache.bookkeeper.replication;
 
+/**
+ * Replication statistics.
+ */
 public interface ReplicationStats {
 
-    public final static String REPLICATION_SCOPE = "replication";
+    String REPLICATION_SCOPE = "replication";
 
-    public final static String AUDITOR_SCOPE = "auditor";
-    public final static String ELECTION_ATTEMPTS = "election_attempts";
-    public final static String NUM_UNDER_REPLICATED_LEDGERS = 
"NUM_UNDER_REPLICATED_LEDGERS";
-    public final static String URL_PUBLISH_TIME_FOR_LOST_BOOKIE = 
"URL_PUBLISH_TIME_FOR_LOST_BOOKIE";
-    public final static String BOOKIE_TO_LEDGERS_MAP_CREATION_TIME = 
"BOOKIE_TO_LEDGERS_MAP_CREATION_TIME";
-    public final static String CHECK_ALL_LEDGERS_TIME = 
"CHECK_ALL_LEDGERS_TIME";
-    public final static String NUM_FRAGMENTS_PER_LEDGER = 
"NUM_FRAGMENTS_PER_LEDGER";
-    public final static String NUM_BOOKIES_PER_LEDGER = 
"NUM_BOOKIES_PER_LEDGER";
-    public final static String NUM_LEDGERS_CHECKED = "NUM_LEDGERS_CHECKED";
-    public final static String NUM_BOOKIE_AUDITS_DELAYED = 
"NUM_BOOKIE_AUDITS_DELAYED";
-    public final static String NUM_DELAYED_BOOKIE_AUDITS_DELAYES_CANCELLED = 
"NUM_DELAYED_BOOKIE_AUDITS_CANCELLED";
+    String AUDITOR_SCOPE = "auditor";
+    String ELECTION_ATTEMPTS = "election_attempts";
+    String NUM_UNDER_REPLICATED_LEDGERS = "NUM_UNDER_REPLICATED_LEDGERS";
+    String URL_PUBLISH_TIME_FOR_LOST_BOOKIE = 
"URL_PUBLISH_TIME_FOR_LOST_BOOKIE";
+    String BOOKIE_TO_LEDGERS_MAP_CREATION_TIME = 
"BOOKIE_TO_LEDGERS_MAP_CREATION_TIME";
+    String CHECK_ALL_LEDGERS_TIME = "CHECK_ALL_LEDGERS_TIME";
+    String NUM_FRAGMENTS_PER_LEDGER = "NUM_FRAGMENTS_PER_LEDGER";
+    String NUM_BOOKIES_PER_LEDGER = "NUM_BOOKIES_PER_LEDGER";
+    String NUM_LEDGERS_CHECKED = "NUM_LEDGERS_CHECKED";
+    String NUM_BOOKIE_AUDITS_DELAYED = "NUM_BOOKIE_AUDITS_DELAYED";
+    String NUM_DELAYED_BOOKIE_AUDITS_DELAYES_CANCELLED = 
"NUM_DELAYED_BOOKIE_AUDITS_CANCELLED";
 
-    public final static String REPLICATION_WORKER_SCOPE = "replication_worker";
-    public final static String REREPLICATE_OP = "rereplicate";
-    public final static String NUM_FULL_OR_PARTIAL_LEDGERS_REPLICATED = 
"NUM_FULL_OR_PARTIAL_LEDGERS_REPLICATED";
-    public final static String NUM_ENTRIES_READ = "NUM_ENTRIES_READ";
-    public final static String NUM_BYTES_READ = "NUM_BYTES_READ";
-    public final static String NUM_ENTRIES_WRITTEN = "NUM_ENTRIES_WRITTEN";
-    public final static String NUM_BYTES_WRITTEN = "NUM_BYTES_WRITTEN";
-    public final static String REPLICATE_EXCEPTION = "exceptions";
+    String REPLICATION_WORKER_SCOPE = "replication_worker";
+    String REREPLICATE_OP = "rereplicate";
+    String NUM_FULL_OR_PARTIAL_LEDGERS_REPLICATED = 
"NUM_FULL_OR_PARTIAL_LEDGERS_REPLICATED";
+    String NUM_ENTRIES_READ = "NUM_ENTRIES_READ";
+    String NUM_BYTES_READ = "NUM_BYTES_READ";
+    String NUM_ENTRIES_WRITTEN = "NUM_ENTRIES_WRITTEN";
+    String NUM_BYTES_WRITTEN = "NUM_BYTES_WRITTEN";
+    String REPLICATE_EXCEPTION = "exceptions";
 
-    public final static String BK_CLIENT_SCOPE = "bk_client";
+    String BK_CLIENT_SCOPE = "bk_client";
 
 }
diff --git 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/ReplicationWorker.java
 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/ReplicationWorker.java
index cd79afd..b3adc0a 100644
--- 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/ReplicationWorker.java
+++ 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/ReplicationWorker.java
@@ -19,25 +19,29 @@
  */
 package org.apache.bookkeeper.replication;
 
+import static 
org.apache.bookkeeper.replication.ReplicationStats.BK_CLIENT_SCOPE;
+import static 
org.apache.bookkeeper.replication.ReplicationStats.NUM_FULL_OR_PARTIAL_LEDGERS_REPLICATED;
+import static 
org.apache.bookkeeper.replication.ReplicationStats.REPLICATE_EXCEPTION;
+import static 
org.apache.bookkeeper.replication.ReplicationStats.REREPLICATE_OP;
+
 import com.google.common.base.Stopwatch;
+
 import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Collection;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Set;
+import java.util.SortedMap;
 import java.util.Timer;
 import java.util.TimerTask;
-import java.util.SortedMap;
-import java.util.ArrayList;
-import java.util.Collection;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
+
 import org.apache.bookkeeper.bookie.BookieThread;
 import org.apache.bookkeeper.client.BKException;
-import 
org.apache.bookkeeper.client.BKException.BKBookieHandleNotAvailableException;
-import org.apache.bookkeeper.client.BKException.BKLedgerRecoveryException;
 import org.apache.bookkeeper.client.BKException.BKNoSuchLedgerExistsException;
 import org.apache.bookkeeper.client.BKException.BKNotEnoughBookiesException;
-import org.apache.bookkeeper.client.BKException.BKReadException;
 import org.apache.bookkeeper.client.BookKeeper;
 import org.apache.bookkeeper.client.BookKeeperAdmin;
 import org.apache.bookkeeper.client.LedgerChecker;
@@ -61,11 +65,6 @@ import org.apache.zookeeper.ZooKeeper;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import static 
org.apache.bookkeeper.replication.ReplicationStats.BK_CLIENT_SCOPE;
-import static 
org.apache.bookkeeper.replication.ReplicationStats.NUM_FULL_OR_PARTIAL_LEDGERS_REPLICATED;
-import static 
org.apache.bookkeeper.replication.ReplicationStats.REPLICATE_EXCEPTION;
-import static 
org.apache.bookkeeper.replication.ReplicationStats.REREPLICATE_OP;
-
 /**
  * ReplicationWorker will take the fragments one by one from
  * ZKLedgerUnderreplicationManager and replicates to it.
@@ -89,7 +88,7 @@ public class ReplicationWorker implements Runnable {
     private final StatsLogger statsLogger;
     private final OpStatsLogger rereplicateOpStats;
     private final Counter numLedgersReplicated;
-    private final Map<String,Counter> exceptionCounters;
+    private final Map<String, Counter> exceptionCounters;
 
     /**
      * Replication worker for replicating the ledger fragments from
@@ -154,7 +153,9 @@ public class ReplicationWorker implements Runnable {
         this.exceptionCounters = new HashMap<String, Counter>();
     }
 
-    /** Start the replication worker */
+    /**
+     * Start the replication worker.
+     */
     public void start() {
         this.workerThread.start();
     }
@@ -192,7 +193,7 @@ public class ReplicationWorker implements Runnable {
 
     /**
      * Replicates the under replicated fragments from failed bookie ledger to
-     * targetBookie
+     * targetBookie.
      */
     private void rereplicate() throws InterruptedException, BKException,
             UnavailableException {
@@ -298,18 +299,18 @@ public class ReplicationWorker implements Runnable {
      * taken. This is fine, until enough bookies fail to cause a quorum to 
become
      * unavailable, by which time the ledger is unrecoverable.
      *
-     * For example, if in a E3Q2, only 1 entry is written and the last bookie
+     * <p>For example, if in a E3Q2, only 1 entry is written and the last 
bookie
      * in the ensemble fails, nothing has been written to it, so nothing needs 
to be
      * recovered. But if the second to last bookie fails, we've now lost 
quorum for
      * the second entry, so it's impossible to see if the second has been 
written or
      * not.
      *
-     * To avoid this situation, we need to check if bookies in the final open 
ensemble
+     * <p>To avoid this situation, we need to check if bookies in the final 
open ensemble
      * are unavailable, and take action if so. The action to take is to close 
the ledger,
      * after a grace period as the writting client may replace the faulty 
bookie on its
      * own.
      *
-     * Missing bookies in closed ledgers are fine, as we know the last 
confirmed add, so
+     * <p>Missing bookies in closed ledgers are fine, as we know the last 
confirmed add, so
      * we can tell which entries are supposed to exist and rereplicate them if 
necessary.
      */
     private boolean isLastSegmentOpenAndMissingBookies(LedgerHandle lh) throws 
BKException {
@@ -318,8 +319,7 @@ public class ReplicationWorker implements Runnable {
             return false;
         }
 
-        SortedMap<Long, ArrayList<BookieSocketAddress>> ensembles
-            = admin.getLedgerMetadata(lh).getEnsembles();
+        SortedMap<Long, ArrayList<BookieSocketAddress>> ensembles = 
admin.getLedgerMetadata(lh).getEnsembles();
         ArrayList<BookieSocketAddress> finalEnsemble = 
ensembles.get(ensembles.lastKey());
         Collection<BookieSocketAddress> available = 
admin.getAvailableBookies();
         for (BookieSocketAddress b : finalEnsemble) {
@@ -330,7 +330,9 @@ public class ReplicationWorker implements Runnable {
         return false;
     }
 
-    /** Gets the under replicated fragments */
+    /**
+     * Gets the under replicated fragments.
+     */
     private Set<LedgerFragment> getUnderreplicatedFragments(LedgerHandle lh)
             throws InterruptedException {
         CheckerCallback checkerCb = new CheckerCallback();
@@ -342,7 +344,7 @@ public class ReplicationWorker implements Runnable {
     /**
      * Schedules a timer task for releasing the lock which will be scheduled
      * after open ledger fragment replication time. Ledger will be fenced if it
-     * is still in open state when timer task fired
+     * is still in open state when timer task fired.
      */
     private void deferLedgerLockRelease(final long ledgerId) {
         long gracePeriod = this.openLedgerRereplicationGracePeriod;
@@ -405,7 +407,7 @@ public class ReplicationWorker implements Runnable {
     }
 
     /**
-     * Stop the replication worker service
+     * Stop the replication worker service.
      */
     public void shutdown() {
         LOG.info("Shutting down replication worker");
@@ -443,13 +445,15 @@ public class ReplicationWorker implements Runnable {
     }
 
     /**
-     * Gives the running status of ReplicationWorker
+     * Gives the running status of ReplicationWorker.
      */
     boolean isRunning() {
         return workerRunning && workerThread.isAlive();
     }
 
-    /** Ledger checker call back */
+    /**
+     * Ledger checker call back.
+     */
     private static class CheckerCallback implements
             GenericCallback<Set<LedgerFragment>> {
         private Set<LedgerFragment> result = null;
@@ -463,7 +467,7 @@ public class ReplicationWorker implements Runnable {
 
         /**
          * Wait until operation complete call back comes and return the ledger
-         * fragments set
+         * fragments set.
          */
         Set<LedgerFragment> waitAndGetResult() throws InterruptedException {
             latch.await();
diff --git 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/package-info.java
 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/package-info.java
new file mode 100644
index 0000000..161ae91
--- /dev/null
+++ 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/replication/package-info.java
@@ -0,0 +1,23 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+/**
+ * Classes for replicating Bookkeeper data.
+ */
+package org.apache.bookkeeper.replication;
diff --git 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ConfigurationService.java
 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ConfigurationService.java
index 0a8e8a3..983da4a 100644
--- 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ConfigurationService.java
+++ 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ConfigurationService.java
@@ -18,7 +18,8 @@
  */
 package org.apache.bookkeeper.server.http.service;
 
-import com.google.common.base.Preconditions;
+import static com.google.common.base.Preconditions.checkNotNull;
+
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.Map;
@@ -38,7 +39,7 @@ public class ConfigurationService implements 
HttpEndpointService {
     protected ServerConfiguration conf;
 
     public ConfigurationService(ServerConfiguration conf) {
-        Preconditions.checkNotNull(conf);
+        checkNotNull(conf);
         this.conf = conf;
     }
 
@@ -53,14 +54,14 @@ public class ConfigurationService implements 
HttpEndpointService {
             return response;
         } else if (HttpServer.Method.PUT == request.getMethod()) {
             String requestBody = request.getBody();
-            if(null == requestBody) {
+            if (null == requestBody) {
                 response.setCode(HttpServer.StatusCode.NOT_FOUND);
                 response.setBody("Request body not found. should contains k-v 
pairs");
                 return response;
             }
             @SuppressWarnings("unchecked")
             HashMap<String, Object> configMap = JsonUtil.fromJson(requestBody, 
HashMap.class);
-            for(Map.Entry<String, Object> entry: configMap.entrySet()) {
+            for (Map.Entry<String, Object> entry: configMap.entrySet()) {
                 conf.setProperty(entry.getKey(), entry.getValue());
             }
 
diff --git 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/DecommissionService.java
 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/DecommissionService.java
index dd3f764..ea05f6e 100644
--- 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/DecommissionService.java
+++ 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/DecommissionService.java
@@ -18,9 +18,11 @@
  */
 package org.apache.bookkeeper.server.http.service;
 
-import com.google.common.base.Preconditions;
+import static com.google.common.base.Preconditions.checkNotNull;
+
 import java.util.HashMap;
 import java.util.concurrent.ExecutorService;
+
 import org.apache.bookkeeper.client.BookKeeperAdmin;
 import org.apache.bookkeeper.conf.ServerConfiguration;
 import org.apache.bookkeeper.http.HttpServer;
@@ -46,7 +48,7 @@ public class DecommissionService implements 
HttpEndpointService {
 
 
     public DecommissionService(ServerConfiguration conf, BookKeeperAdmin bka, 
ExecutorService executor) {
-        Preconditions.checkNotNull(conf);
+        checkNotNull(conf);
         this.conf = conf;
         this.bka = bka;
         this.executor = executor;
diff --git 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/DeleteLedgerService.java
 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/DeleteLedgerService.java
index 6b25e1e..2593e94 100644
--- 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/DeleteLedgerService.java
+++ 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/DeleteLedgerService.java
@@ -18,7 +18,8 @@
  */
 package org.apache.bookkeeper.server.http.service;
 
-import com.google.common.base.Preconditions;
+import static com.google.common.base.Preconditions.checkNotNull;
+
 import java.util.Map;
 import org.apache.bookkeeper.client.BookKeeper;
 import org.apache.bookkeeper.conf.ClientConfiguration;
@@ -42,7 +43,7 @@ public class DeleteLedgerService implements 
HttpEndpointService {
     protected ServerConfiguration conf;
 
     public DeleteLedgerService(ServerConfiguration conf) {
-        Preconditions.checkNotNull(conf);
+        checkNotNull(conf);
         this.conf = conf;
     }
 
diff --git 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ExpandStorageService.java
 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ExpandStorageService.java
index 9ff5411..b79fb41 100644
--- 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ExpandStorageService.java
+++ 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ExpandStorageService.java
@@ -18,11 +18,14 @@
  */
 package org.apache.bookkeeper.server.http.service;
 
-import com.google.common.base.Preconditions;
+import static com.google.common.base.Preconditions.checkNotNull;
+
 import com.google.common.collect.Lists;
+
 import java.io.File;
 import java.util.Arrays;
 import java.util.List;
+
 import org.apache.bookkeeper.bookie.Bookie;
 import org.apache.bookkeeper.bookie.BookieException;
 import org.apache.bookkeeper.conf.ServerConfiguration;
@@ -51,7 +54,7 @@ public class ExpandStorageService implements 
HttpEndpointService {
     private ZooKeeper zk;
 
     public ExpandStorageService(ServerConfiguration conf, ZooKeeper zk) {
-        Preconditions.checkNotNull(conf);
+        checkNotNull(conf);
         this.conf = conf;
         this.zk = zk;
     }
diff --git 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/GetLastLogMarkService.java
 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/GetLastLogMarkService.java
index 92ad78d..31268cd 100644
--- 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/GetLastLogMarkService.java
+++ 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/GetLastLogMarkService.java
@@ -18,12 +18,15 @@
  */
 package org.apache.bookkeeper.server.http.service;
 
-import com.google.common.base.Preconditions;
+import static com.google.common.base.Preconditions.checkNotNull;
+
 import com.google.common.collect.Lists;
 import com.google.common.collect.Maps;
+
 import java.io.File;
 import java.util.List;
 import java.util.Map;
+
 import org.apache.bookkeeper.bookie.Journal;
 import org.apache.bookkeeper.bookie.LedgerDirsManager;
 import org.apache.bookkeeper.bookie.LogMark;
@@ -41,9 +44,9 @@ import org.slf4j.LoggerFactory;
  * HttpEndpointService that handle Bookkeeper get last log mark related http 
request.
  * The GET method will get the last log position of each journal.
  *
- * output would be like this:
+ * <p>output would be like this:
  *  {
- *    "<Journal_id>" : "<Pos>",
+ *    "&lt;Journal_id&gt;" : "&lt;Pos&gt;",
  *    ...
  *  }
  */
@@ -54,7 +57,7 @@ public class GetLastLogMarkService implements 
HttpEndpointService {
     protected ServerConfiguration conf;
 
     public GetLastLogMarkService(ServerConfiguration conf) {
-        Preconditions.checkNotNull(conf);
+        checkNotNull(conf);
         this.conf = conf;
     }
 
@@ -67,7 +70,7 @@ public class GetLastLogMarkService implements 
HttpEndpointService {
                 /**
                  * output:
                  *  {
-                 *    "<Journal_id>" : "<Pos>",
+                 *    "&lt;Journal_id&gt;" : "&lt;Pos&gt;",
                  *    ...
                  *  }
                  */
diff --git 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/GetLedgerMetaService.java
 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/GetLedgerMetaService.java
index 43889d3..c92ad81 100644
--- 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/GetLedgerMetaService.java
+++ 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/GetLedgerMetaService.java
@@ -19,8 +19,8 @@
 package org.apache.bookkeeper.server.http.service;
 
 import static com.google.common.base.Charsets.UTF_8;
+import static com.google.common.base.Preconditions.checkNotNull;
 
-import com.google.common.base.Preconditions;
 import com.google.common.collect.Maps;
 import java.util.Map;
 import org.apache.bookkeeper.client.LedgerMetadata;
@@ -48,7 +48,7 @@ public class GetLedgerMetaService implements 
HttpEndpointService {
     protected ZooKeeper zk;
 
     public GetLedgerMetaService(ServerConfiguration conf, ZooKeeper zk) {
-        Preconditions.checkNotNull(conf);
+        checkNotNull(conf);
         this.conf = conf;
         this.zk = zk;
     }
diff --git 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ListBookieInfoService.java
 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ListBookieInfoService.java
index d0979c7..72897cf 100644
--- 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ListBookieInfoService.java
+++ 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ListBookieInfoService.java
@@ -18,12 +18,15 @@
  */
 package org.apache.bookkeeper.server.http.service;
 
-import com.google.common.base.Preconditions;
+import static com.google.common.base.Preconditions.checkNotNull;
+
 import com.google.common.collect.Maps;
+
 import java.math.RoundingMode;
 import java.text.DecimalFormat;
 import java.util.LinkedHashMap;
 import java.util.Map;
+
 import org.apache.bookkeeper.client.BookKeeper;
 import org.apache.bookkeeper.client.BookieInfoReader;
 import org.apache.bookkeeper.conf.ClientConfiguration;
@@ -40,7 +43,7 @@ import org.slf4j.LoggerFactory;
 /**
  * HttpEndpointService that handle Bookkeeper list bookie info related http 
request.
  *
- * The GET method will get the disk usage of all bookies in this bookkeeper 
cluster.
+ * <p>The GET method will get the disk usage of all bookies in this bookkeeper 
cluster.
  * Output would be like this:
  *  {
  *    "bookieAddress" : {free: xxx, total: xxx}",
@@ -56,7 +59,7 @@ public class ListBookieInfoService implements 
HttpEndpointService {
     protected ServerConfiguration conf;
 
     public ListBookieInfoService(ServerConfiguration conf) {
-        Preconditions.checkNotNull(conf);
+        checkNotNull(conf);
         this.conf = conf;
     }
 
diff --git 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ListBookiesService.java
 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ListBookiesService.java
index f0275a1..b28c715 100644
--- 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ListBookiesService.java
+++ 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ListBookiesService.java
@@ -18,11 +18,14 @@
  */
 package org.apache.bookkeeper.server.http.service;
 
-import com.google.common.base.Preconditions;
+import static com.google.common.base.Preconditions.checkNotNull;
+
 import com.google.common.collect.Maps;
+
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Map;
+
 import org.apache.bookkeeper.client.BookKeeperAdmin;
 import org.apache.bookkeeper.conf.ServerConfiguration;
 import org.apache.bookkeeper.http.HttpServer;
@@ -46,7 +49,7 @@ public class ListBookiesService implements 
HttpEndpointService {
     protected BookKeeperAdmin bka;
 
     public ListBookiesService(ServerConfiguration conf, BookKeeperAdmin bka) {
-        Preconditions.checkNotNull(conf);
+        checkNotNull(conf);
         this.conf = conf;
         this.bka = bka;
     }
@@ -60,13 +63,13 @@ public class ListBookiesService implements 
HttpEndpointService {
 
             Map<String, String> params = request.getParams();
             // default print rw
-            boolean readOnly = (params != null) &&
-              params.containsKey("type") &&
-              params.get("type").equals("ro");
+            boolean readOnly = (params != null)
+                && params.containsKey("type")
+                && params.get("type").equals("ro");
             // default not print hostname
-            boolean printHostname = (params != null) &&
-              params.containsKey("print_hostnames") &&
-              params.get("print_hostnames").equals("true");
+            boolean printHostname = (params != null)
+                && params.containsKey("print_hostnames")
+                && params.get("print_hostnames").equals("true");
 
             if (readOnly) {
                 bookies.addAll(bka.getReadOnlyBookies());
diff --git 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ListDiskFilesService.java
 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ListDiskFilesService.java
index d557f98..260b82d 100644
--- 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ListDiskFilesService.java
+++ 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ListDiskFilesService.java
@@ -18,13 +18,15 @@
  */
 package org.apache.bookkeeper.server.http.service;
 
+import static com.google.common.base.Preconditions.checkNotNull;
 import static org.apache.bookkeeper.bookie.BookieShell.listFilesAndSort;
 
-import com.google.common.base.Preconditions;
 import com.google.common.collect.Maps;
+
 import java.io.File;
 import java.util.List;
 import java.util.Map;
+
 import org.apache.bookkeeper.conf.ServerConfiguration;
 import org.apache.bookkeeper.http.HttpServer;
 import org.apache.bookkeeper.http.service.HttpEndpointService;
@@ -37,7 +39,7 @@ import org.slf4j.LoggerFactory;
 /**
  * HttpEndpointService that handle Bookkeeper list disk files related http 
request.
  *
- * The GET method will list all bookie files of type journal|entrylog|index in 
this bookie.
+ * <p>The GET method will list all bookie files of type journal|entrylog|index 
in this bookie.
  * The output would be like this:
  *  {
  *    "journal files" : "filename1 \t ...",
@@ -52,7 +54,7 @@ public class ListDiskFilesService implements 
HttpEndpointService {
     protected ServerConfiguration conf;
 
     public ListDiskFilesService(ServerConfiguration conf) {
-        Preconditions.checkNotNull(conf);
+        checkNotNull(conf);
         this.conf = conf;
     }
 
@@ -72,14 +74,14 @@ public class ListDiskFilesService implements 
HttpEndpointService {
              */
             Map<String, String> output = Maps.newHashMap();
 
-            boolean journal = params != null &&
-                params.containsKey("file_type")
+            boolean journal = params != null
+                && params.containsKey("file_type")
                 && params.get("file_type").equals("journal");
-            boolean entrylog = params != null &&
-                params.containsKey("file_type")
+            boolean entrylog = params != null
+                && params.containsKey("file_type")
                 && params.get("file_type").equals("entrylog");
-            boolean index = params != null &&
-                params.containsKey("file_type")
+            boolean index = params != null
+                && params.containsKey("file_type")
                 && params.get("file_type").equals("index");
             boolean all = false;
 
@@ -102,7 +104,7 @@ public class ListDiskFilesService implements 
HttpEndpointService {
                 List<File> ledgerFiles = listFilesAndSort(ledgerDirs, "log");
                 StringBuffer files = new StringBuffer();
                 for (File ledgerFile : ledgerFiles) {
-                    files.append(ledgerFile.getName()+ "\t");
+                    files.append(ledgerFile.getName() + "\t");
                 }
                 output.put("entrylog files", files.toString());
             }
@@ -112,7 +114,7 @@ public class ListDiskFilesService implements 
HttpEndpointService {
                 List<File> indexFiles = listFilesAndSort(indexDirs, "idx");
                 StringBuffer files = new StringBuffer();
                 for (File indexFile : indexFiles) {
-                    files.append(indexFile.getName()+ "\t");
+                    files.append(indexFile.getName() + "\t");
                 }
                 output.put("index files", files.toString());
             }
diff --git 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ListLedgerService.java
 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ListLedgerService.java
index 75d9629..2062507 100644
--- 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ListLedgerService.java
+++ 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ListLedgerService.java
@@ -19,8 +19,8 @@
 package org.apache.bookkeeper.server.http.service;
 
 import static com.google.common.base.Charsets.UTF_8;
+import static com.google.common.base.Preconditions.checkNotNull;
 
-import com.google.common.base.Preconditions;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Maps;
 import com.google.common.util.concurrent.AbstractFuture;
@@ -45,7 +45,7 @@ import org.slf4j.LoggerFactory;
 /**
  * HttpEndpointService that handle Bookkeeper list ledger related http request.
  *
- * The GET method will list all ledger_ids in this bookkeeper cluster.
+ * <p>The GET method will list all ledger_ids in this bookkeeper cluster.
  * User can choose print metadata of each ledger or not by set parameter 
"print_metadata"
  */
 public class ListLedgerService implements HttpEndpointService {
@@ -56,7 +56,7 @@ public class ListLedgerService implements HttpEndpointService 
{
     protected ZooKeeper zk;
 
     public ListLedgerService(ServerConfiguration conf, ZooKeeper zk) {
-        Preconditions.checkNotNull(conf);
+        checkNotNull(conf);
         this.conf = conf;
         this.zk = zk;
     }
@@ -64,6 +64,9 @@ public class ListLedgerService implements HttpEndpointService 
{
     // Number of LedgerMetadata contains in each page
     static final int LIST_LEDGER_BATCH_SIZE = 100;
 
+    /**
+     * Callback for reading ledger metadata.
+     */
     public static class ReadLedgerMetadataCallback extends 
AbstractFuture<LedgerMetadata>
       implements BookkeeperInternalCallbacks.GenericCallback<LedgerMetadata> {
         final long ledgerId;
@@ -84,7 +87,8 @@ public class ListLedgerService implements HttpEndpointService 
{
             }
         }
     }
-    static void keepLedgerMetadata(ReadLedgerMetadataCallback cb, 
LinkedHashMap<String, String> output) throws Exception {
+    static void keepLedgerMetadata(ReadLedgerMetadataCallback cb, 
LinkedHashMap<String, String> output)
+            throws Exception {
         LedgerMetadata md = cb.get();
         output.put(Long.valueOf(cb.getLedgerId()).toString(), new 
String(md.serialize(), UTF_8));
     }
@@ -97,14 +101,13 @@ public class ListLedgerService implements 
HttpEndpointService {
         if (HttpServer.Method.GET == request.getMethod()) {
             Map<String, String> params = request.getParams();
             // default not print metadata
-            boolean printMeta = (params != null) &&
-              params.containsKey("print_metadata") &&
-              params.get("print_metadata").equals("true");
+            boolean printMeta = (params != null)
+              && params.containsKey("print_metadata")
+              && params.get("print_metadata").equals("true");
 
             // Page index should start from 1;
-            int pageIndex = (printMeta && params.containsKey("page")) ?
-              Integer.parseInt(params.get("page")) :
-              -1;
+            int pageIndex = (printMeta && params.containsKey("page"))
+                ? Integer.parseInt(params.get("page")) : -1;
 
             LedgerManagerFactory mFactory = 
LedgerManagerFactory.newLedgerManagerFactory(conf, zk);
             LedgerManager manager = mFactory.newLedgerManager();
@@ -121,7 +124,7 @@ public class ListLedgerService implements 
HttpEndpointService {
                 // start and end ledger index for wanted page.
                 int startLedgerIndex = 0;
                 int endLedgerIndex = 0;
-                if(pageIndex > 0) {
+                if (pageIndex > 0) {
                     startLedgerIndex = (pageIndex - 1) * 
LIST_LEDGER_BATCH_SIZE;
                     endLedgerIndex = startLedgerIndex + LIST_LEDGER_BATCH_SIZE 
- 1;
                 }
@@ -130,9 +133,9 @@ public class ListLedgerService implements 
HttpEndpointService {
                 while (iter.hasNext()) {
                     LedgerManager.LedgerRange r = iter.next();
                     for (Long lid : r.getLedgers()) {
-                        ledgerIndex ++;
-                        if (endLedgerIndex == 0 ||       // no actual page 
parameter provided
-                          (ledgerIndex >= startLedgerIndex && ledgerIndex <= 
endLedgerIndex)) {
+                        ledgerIndex++;
+                        if (endLedgerIndex == 0       // no actual page 
parameter provided
+                                || (ledgerIndex >= startLedgerIndex && 
ledgerIndex <= endLedgerIndex)) {
                             ReadLedgerMetadataCallback cb = new 
ReadLedgerMetadataCallback(lid);
                             manager.readLedgerMetadata(lid, cb);
                             futures.add(cb);
diff --git 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ListUnderReplicatedLedgerService.java
 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ListUnderReplicatedLedgerService.java
index 01929bb..a76d509 100644
--- 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ListUnderReplicatedLedgerService.java
+++ 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ListUnderReplicatedLedgerService.java
@@ -18,12 +18,15 @@
  */
 package org.apache.bookkeeper.server.http.service;
 
-import com.google.common.base.Preconditions;
+import static com.google.common.base.Preconditions.checkNotNull;
+
 import com.google.common.collect.Lists;
+
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
 import java.util.function.Predicate;
+
 import org.apache.bookkeeper.conf.ServerConfiguration;
 import org.apache.bookkeeper.http.HttpServer;
 import org.apache.bookkeeper.http.service.HttpEndpointService;
@@ -40,7 +43,7 @@ import org.slf4j.LoggerFactory;
 /**
  * HttpEndpointService that handle Bookkeeper list under replicated ledger 
related http request.
  *
- * The GET method will list all ledger_ids of under replicated ledger.
+ * <p>The GET method will list all ledger_ids of under replicated ledger.
  * User can filer wanted ledger by set parameter "missingreplica" and 
"excludingmissingreplica"
  */
 public class ListUnderReplicatedLedgerService implements HttpEndpointService {
@@ -51,7 +54,7 @@ public class ListUnderReplicatedLedgerService implements 
HttpEndpointService {
     protected ZooKeeper zk;
 
     public ListUnderReplicatedLedgerService(ServerConfiguration conf, 
ZooKeeper zk) {
-        Preconditions.checkNotNull(conf);
+        checkNotNull(conf);
         this.conf = conf;
         this.zk = zk;
     }
diff --git 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/LostBookieRecoveryDelayService.java
 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/LostBookieRecoveryDelayService.java
index 1a2ed61..fcc9eff 100644
--- 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/LostBookieRecoveryDelayService.java
+++ 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/LostBookieRecoveryDelayService.java
@@ -18,8 +18,10 @@
  */
 package org.apache.bookkeeper.server.http.service;
 
-import com.google.common.base.Preconditions;
+import static com.google.common.base.Preconditions.checkNotNull;
+
 import java.util.HashMap;
+
 import org.apache.bookkeeper.client.BookKeeperAdmin;
 import org.apache.bookkeeper.conf.ServerConfiguration;
 import org.apache.bookkeeper.http.HttpServer;
@@ -33,7 +35,7 @@ import org.slf4j.LoggerFactory;
 /**
  * HttpEndpointService that handle Bookkeeper lost bookie recovery delay 
parameter related http request.
  *
- * The GET method will get the value of parameter lostBookieRecoveryDelay,
+ * <p>The GET method will get the value of parameter lostBookieRecoveryDelay,
  * while the PUT method will set the value of parameter 
lostBookieRecoveryDelay,
  */
 public class LostBookieRecoveryDelayService implements HttpEndpointService {
@@ -44,7 +46,7 @@ public class LostBookieRecoveryDelayService implements 
HttpEndpointService {
     protected BookKeeperAdmin bka;
 
     public LostBookieRecoveryDelayService(ServerConfiguration conf, 
BookKeeperAdmin bka) {
-        Preconditions.checkNotNull(conf);
+        checkNotNull(conf);
         this.conf = conf;
         this.bka = bka;
     }
diff --git 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ReadLedgerEntryService.java
 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ReadLedgerEntryService.java
index 7454bc3..9bed45d 100644
--- 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ReadLedgerEntryService.java
+++ 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/ReadLedgerEntryService.java
@@ -19,9 +19,10 @@
 package org.apache.bookkeeper.server.http.service;
 
 import static com.google.common.base.Charsets.US_ASCII;
+import static com.google.common.base.Preconditions.checkNotNull;
 
-import com.google.common.base.Preconditions;
 import com.google.common.collect.Maps;
+
 import java.util.Iterator;
 import java.util.Map;
 import org.apache.bookkeeper.client.BookKeeperAdmin;
@@ -38,7 +39,7 @@ import org.slf4j.LoggerFactory;
 /**
  * HttpEndpointService that handle Bookkeeper read ledger entry related http 
request.
  *
- * The GET method will print all entry content of wanted entry.
+ * <p>The GET method will print all entry content of wanted entry.
  * User should set wanted "ledger_id", and can choose only print out wanted 
entry
  * by set parameter "start_entry_id", "end_entry_id" and "page".
  */
@@ -50,7 +51,7 @@ public class ReadLedgerEntryService implements 
HttpEndpointService {
     protected BookKeeperAdmin bka;
 
     public ReadLedgerEntryService(ServerConfiguration conf, BookKeeperAdmin 
bka) {
-        Preconditions.checkNotNull(conf);
+        checkNotNull(conf);
         this.conf = conf;
         this.bka = bka;
     }
@@ -78,7 +79,7 @@ public class ReadLedgerEntryService implements 
HttpEndpointService {
 
             // Page index should start from 1;
             Integer pageIndex = params.containsKey("page") ? 
Integer.parseInt(params.get("page")) : -1;
-            if(pageIndex > 0) {
+            if (pageIndex > 0) {
                 // start and end ledger index for wanted page.
                 Long startIndexInPage = (pageIndex - 1) * ENTRIES_PER_PAE;
                 Long endIndexInPage = startIndexInPage + ENTRIES_PER_PAE - 1;
diff --git 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/RecoveryBookieService.java
 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/RecoveryBookieService.java
index ecce428..3b1e175 100644
--- 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/RecoveryBookieService.java
+++ 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/RecoveryBookieService.java
@@ -18,9 +18,13 @@
  */
 package org.apache.bookkeeper.server.http.service;
 
-import com.google.common.base.Preconditions;
+import static com.google.common.base.Preconditions.checkNotNull;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
 import java.util.List;
 import java.util.concurrent.ExecutorService;
+
 import org.apache.bookkeeper.bookie.Cookie;
 import org.apache.bookkeeper.client.BookKeeperAdmin;
 import org.apache.bookkeeper.conf.ServerConfiguration;
@@ -40,12 +44,12 @@ import org.slf4j.LoggerFactory;
 /**
  * HttpEndpointService that handle Bookkeeper recovery related http request.
  *
- * The PUT method will recovery bookie with provided parameter.
+ * <p>The PUT method will recovery bookie with provided parameter.
  * The parameter of input body should be like this format:
  * {
  *   "bookie_src": [ "bookie_src1", "bookie_src2"... ],
  *   "bookie_dest": [ "bookie_dest1", "bookie_dest2"... ],
- *   "delete_cookie": <bool_value>
+ *   "delete_cookie": &lt;bool_value&gt;
  * }
  */
 public class RecoveryBookieService implements HttpEndpointService {
@@ -57,7 +61,7 @@ public class RecoveryBookieService implements 
HttpEndpointService {
     protected ExecutorService executor;
 
     public RecoveryBookieService(ServerConfiguration conf, BookKeeperAdmin 
bka, ExecutorService executor) {
-        Preconditions.checkNotNull(conf);
+        checkNotNull(conf);
         this.conf = conf;
         this.bka = bka;
         this.executor = executor;
@@ -71,8 +75,11 @@ public class RecoveryBookieService implements 
HttpEndpointService {
      * }
      */
     static class RecoveryRequestJsonBody {
-        public List<String> bookie_src;
-        public boolean delete_cookie;
+        @JsonProperty("bookie_src")
+        public List<String> bookieSrc;
+
+        @JsonProperty("delete_cookie")
+        public boolean deleteCookie;
     }
 
     @Override
@@ -89,8 +96,8 @@ public class RecoveryBookieService implements 
HttpEndpointService {
 
         try {
             requestJsonBody = JsonUtil.fromJson(requestBody, 
RecoveryRequestJsonBody.class);
-            LOG.debug("bookie_src: [" + requestJsonBody.bookie_src.get(0)
-                + "],  delete_cookie: [" + requestJsonBody.delete_cookie + 
"]");
+            LOG.debug("bookie_src: [" + requestJsonBody.bookieSrc.get(0)
+                + "],  delete_cookie: [" + requestJsonBody.deleteCookie + "]");
         } catch (JsonUtil.ParseJsonException e) {
             LOG.error("Meet Exception: ", e);
             response.setCode(HttpServer.StatusCode.NOT_FOUND);
@@ -98,17 +105,16 @@ public class RecoveryBookieService implements 
HttpEndpointService {
             return response;
         }
 
-        if (HttpServer.Method.PUT == request.getMethod() &&
-            !requestJsonBody.bookie_src.isEmpty()) {
+        if (HttpServer.Method.PUT == request.getMethod() && 
!requestJsonBody.bookieSrc.isEmpty()) {
 
             Class<? extends RegistrationManager> rmClass = 
conf.getRegistrationManagerClass();
             RegistrationManager rm = ReflectionUtils.newInstance(rmClass);
             rm.initialize(conf, () -> {}, NullStatsLogger.INSTANCE);
 
-            String bookieSrcString[] = 
requestJsonBody.bookie_src.get(0).split(":");
+            String bookieSrcString[] = 
requestJsonBody.bookieSrc.get(0).split(":");
             BookieSocketAddress bookieSrc = new BookieSocketAddress(
               bookieSrcString[0], Integer.parseInt(bookieSrcString[1]));
-            boolean deleteCookie = requestJsonBody.delete_cookie;
+            boolean deleteCookie = requestJsonBody.deleteCookie;
             executor.execute(() -> {
                 try {
                     LOG.info("Start recovering bookie.");
diff --git 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/TriggerAuditService.java
 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/TriggerAuditService.java
index 30b580e..f5c2b4e 100644
--- 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/TriggerAuditService.java
+++ 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/TriggerAuditService.java
@@ -18,7 +18,8 @@
  */
 package org.apache.bookkeeper.server.http.service;
 
-import com.google.common.base.Preconditions;
+import static com.google.common.base.Preconditions.checkNotNull;
+
 import org.apache.bookkeeper.client.BookKeeperAdmin;
 import org.apache.bookkeeper.conf.ServerConfiguration;
 import org.apache.bookkeeper.http.HttpServer;
@@ -40,7 +41,7 @@ public class TriggerAuditService implements 
HttpEndpointService {
     protected BookKeeperAdmin bka;
 
     public TriggerAuditService(ServerConfiguration conf, BookKeeperAdmin bka) {
-        Preconditions.checkNotNull(conf);
+        checkNotNull(conf);
         this.conf = conf;
         this.bka = bka;
     }
diff --git 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/WhoIsAuditorService.java
 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/WhoIsAuditorService.java
index baf9f80..9154ccd 100644
--- 
a/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/WhoIsAuditorService.java
+++ 
b/bookkeeper-server/src/main/java/org/apache/bookkeeper/server/http/service/WhoIsAuditorService.java
@@ -18,7 +18,8 @@
  */
 package org.apache.bookkeeper.server.http.service;
 
-import com.google.common.base.Preconditions;
+import static com.google.common.base.Preconditions.checkNotNull;
+
 import org.apache.bookkeeper.conf.ServerConfiguration;
 import org.apache.bookkeeper.http.HttpServer;
 import org.apache.bookkeeper.http.service.HttpEndpointService;
@@ -33,7 +34,7 @@ import org.slf4j.LoggerFactory;
 /**
  * HttpEndpointService that handle Bookkeeper who is auditor related http 
request.
  *
- * The GET method will get the auditor bookie address
+ * <p>The GET method will get the auditor bookie address
  */
 public class WhoIsAuditorService implements HttpEndpointService {
 
@@ -43,7 +44,7 @@ public class WhoIsAuditorService implements 
HttpEndpointService {
     protected ZooKeeper zk;
 
     public WhoIsAuditorService(ServerConfiguration conf, ZooKeeper zk) {
-        Preconditions.checkNotNull(conf);
+        checkNotNull(conf);
         this.conf = conf;
         this.zk = zk;
     }
diff --git a/buildtools/src/main/resources/bookkeeper/server-suppressions.xml 
b/buildtools/src/main/resources/bookkeeper/server-suppressions.xml
index 4daaf89..6665a6d 100644
--- a/buildtools/src/main/resources/bookkeeper/server-suppressions.xml
+++ b/buildtools/src/main/resources/bookkeeper/server-suppressions.xml
@@ -23,8 +23,6 @@
     <!-- suppress packages by packages -->
     <suppress checks=".*" files=".*[\\/]bookie[\\/].*"/>
     <suppress checks=".*" 
files=".*[\\/]client[\\/](?:[^\\/]+$|(?!api)|(?!impl)[^\\/]+[\\/])"/>
-    <suppress checks=".*" files=".*[\\/]http[\\/].*"/>
-    <suppress checks=".*" files=".*[\\/]replication[\\/].*"/>
     <suppress checks=".*" files=".*[\\/]test[\\/].*"/>
     <suppress checks=".*" files=".*[\\/]util[\\/].*"/>
 

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