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shuber pushed a commit to branch UNOMI-225-ES7
in repository https://gitbox.apache.org/repos/asf/unomi.git

commit 0fde2a80b604d9da43783d0d3c80e36434c1fb55
Author: Serge Huber <[email protected]>
AuthorDate: Sun Apr 7 15:27:57 2019 +0200

    UNOMI-225 Initial work on ElasticSearch 7 support. Includes switching to 
Java High Level Rest Client
    This is very prelimiinary work, it doesn't even compile yet.
    
    Signed-off-by: Serge Huber <[email protected]>
---
 persistence-elasticsearch/core/pom.xml             |  11 +-
 .../ElasticSearchPersistenceServiceImpl.java       | 193 ++++++---------------
 2 files changed, 58 insertions(+), 146 deletions(-)

diff --git a/persistence-elasticsearch/core/pom.xml 
b/persistence-elasticsearch/core/pom.xml
index 19fb68f..395c2c0 100644
--- a/persistence-elasticsearch/core/pom.xml
+++ b/persistence-elasticsearch/core/pom.xml
@@ -60,16 +60,9 @@
             <version>20.0</version>
         </dependency>
         <dependency>
-            <groupId>org.elasticsearch</groupId>
-            <artifactId>elasticsearch</artifactId>
-            <version>${elasticsearch.version}</version>
-            <scope>compile</scope>
-        </dependency>
-        <dependency>
             <groupId>org.elasticsearch.client</groupId>
-            <artifactId>transport</artifactId>
-            <version>${elasticsearch.version}</version>
-            <scope>compile</scope>
+            <artifactId>elasticsearch-rest-high-level-client</artifactId>
+            <version>7.0.0-beta1</version>
         </dependency>
 
         <!-- The following are optional dependencies from the ElasticSearch 
that are made mandatory -->
diff --git 
a/persistence-elasticsearch/core/src/main/java/org/apache/unomi/persistence/elasticsearch/ElasticSearchPersistenceServiceImpl.java
 
b/persistence-elasticsearch/core/src/main/java/org/apache/unomi/persistence/elasticsearch/ElasticSearchPersistenceServiceImpl.java
index 1ab84ff..c579abf 100644
--- 
a/persistence-elasticsearch/core/src/main/java/org/apache/unomi/persistence/elasticsearch/ElasticSearchPersistenceServiceImpl.java
+++ 
b/persistence-elasticsearch/core/src/main/java/org/apache/unomi/persistence/elasticsearch/ElasticSearchPersistenceServiceImpl.java
@@ -19,6 +19,7 @@ package org.apache.unomi.persistence.elasticsearch;
 
 import com.hazelcast.core.HazelcastInstance;
 import org.apache.commons.lang3.StringUtils;
+import org.apache.http.HttpHost;
 import org.apache.unomi.api.Item;
 import org.apache.unomi.api.PartialList;
 import org.apache.unomi.api.TimestampedItem;
@@ -31,6 +32,7 @@ import org.apache.unomi.metrics.MetricsService;
 import org.apache.unomi.persistence.elasticsearch.conditions.*;
 import org.apache.unomi.persistence.spi.PersistenceService;
 import org.apache.unomi.persistence.spi.aggregate.*;
+import org.elasticsearch.action.admin.cluster.health.ClusterHealthRequest;
 import org.elasticsearch.action.admin.cluster.node.info.NodeInfo;
 import org.elasticsearch.action.admin.cluster.node.info.NodesInfoResponse;
 import org.elasticsearch.action.admin.indices.create.CreateIndexRequestBuilder;
@@ -38,10 +40,8 @@ import 
org.elasticsearch.action.admin.indices.exists.indices.IndicesExistsRespon
 import org.elasticsearch.action.admin.indices.mapping.get.GetMappingsResponse;
 import org.elasticsearch.action.admin.indices.stats.IndicesStatsResponse;
 import 
org.elasticsearch.action.admin.indices.template.delete.DeleteIndexTemplateRequest;
-import 
org.elasticsearch.action.admin.indices.template.delete.DeleteIndexTemplateResponse;
 import 
org.elasticsearch.action.admin.indices.template.get.GetIndexTemplatesResponse;
 import 
org.elasticsearch.action.admin.indices.template.put.PutIndexTemplateRequest;
-import 
org.elasticsearch.action.admin.indices.template.put.PutIndexTemplateResponse;
 import org.elasticsearch.action.bulk.*;
 import org.elasticsearch.action.get.GetResponse;
 import org.elasticsearch.action.index.IndexRequestBuilder;
@@ -49,12 +49,12 @@ import org.elasticsearch.action.search.SearchRequestBuilder;
 import org.elasticsearch.action.search.SearchResponse;
 import org.elasticsearch.action.support.WriteRequest;
 import org.elasticsearch.action.update.UpdateRequest;
-import org.elasticsearch.client.Requests;
-import org.elasticsearch.client.transport.TransportClient;
+import org.elasticsearch.client.*;
+import org.elasticsearch.client.core.AcknowledgedResponse;
+import org.elasticsearch.client.indices.GetIndexRequest;
 import org.elasticsearch.cluster.metadata.MappingMetaData;
 import org.elasticsearch.common.collect.ImmutableOpenMap;
 import org.elasticsearch.common.settings.Settings;
-import org.elasticsearch.common.transport.InetSocketTransportAddress;
 import org.elasticsearch.common.unit.ByteSizeUnit;
 import org.elasticsearch.common.unit.ByteSizeValue;
 import org.elasticsearch.common.unit.DistanceUnit;
@@ -81,30 +81,23 @@ import 
org.elasticsearch.search.aggregations.bucket.global.Global;
 import 
org.elasticsearch.search.aggregations.bucket.histogram.DateHistogramAggregationBuilder;
 import 
org.elasticsearch.search.aggregations.bucket.histogram.DateHistogramInterval;
 import 
org.elasticsearch.search.aggregations.bucket.missing.MissingAggregationBuilder;
+import 
org.elasticsearch.search.aggregations.bucket.range.DateRangeAggregationBuilder;
+import 
org.elasticsearch.search.aggregations.bucket.range.IpRangeAggregationBuilder;
 import 
org.elasticsearch.search.aggregations.bucket.range.RangeAggregationBuilder;
-import 
org.elasticsearch.search.aggregations.bucket.range.date.DateRangeAggregationBuilder;
-import 
org.elasticsearch.search.aggregations.bucket.range.ip.IpRangeAggregationBuilder;
+import org.elasticsearch.search.aggregations.bucket.terms.IncludeExclude;
 import 
org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
-import 
org.elasticsearch.search.aggregations.bucket.terms.support.IncludeExclude;
 import 
org.elasticsearch.search.aggregations.metrics.InternalNumericMetricsAggregation;
 import org.elasticsearch.search.sort.GeoDistanceSortBuilder;
 import org.elasticsearch.search.sort.SortBuilders;
 import org.elasticsearch.search.sort.SortOrder;
-import org.elasticsearch.transport.client.PreBuiltTransportClient;
 import org.osgi.framework.*;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import java.io.BufferedReader;
-import java.io.File;
 import java.io.IOException;
 import java.io.InputStreamReader;
-import java.lang.reflect.Constructor;
-import java.lang.reflect.InvocationTargetException;
-import java.net.InetAddress;
-import java.net.MalformedURLException;
 import java.net.URL;
-import java.net.UnknownHostException;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
 import java.util.*;
@@ -126,7 +119,7 @@ public class ElasticSearchPersistenceServiceImpl implements 
PersistenceService,
     public static final String BULK_PROCESSOR_FLUSH_INTERVAL = 
"bulkProcessor.flushInterval";
     public static final String BULK_PROCESSOR_BACKOFF_POLICY = 
"bulkProcessor.backoffPolicy";
     private static final Logger logger = 
LoggerFactory.getLogger(ElasticSearchPersistenceServiceImpl.class.getName());
-    private TransportClient client;
+    private RestHighLevelClient client;
     private BulkProcessor bulkProcessor;
     private String elasticSearchAddresses;
     private List<String> elasticSearchAddressList = new ArrayList<>();
@@ -158,10 +151,6 @@ public class ElasticSearchPersistenceServiceImpl 
implements PersistenceService,
 
     private int aggregateQueryBucketSize = 5000;
 
-    private String transportClientClassName = null;
-    private String transportClientProperties = null;
-    private String transportClientJarDirectory = null;
-
     private MetricsService metricsService;
     private HazelcastInstance hazelcastInstance;
     private Set<String> itemClassesToCacheSet = new HashSet<>();
@@ -263,18 +252,6 @@ public class ElasticSearchPersistenceServiceImpl 
implements PersistenceService,
         this.aggregateQueryBucketSize = aggregateQueryBucketSize;
     }
 
-    public void setTransportClientClassName(String transportClientClassName) {
-        this.transportClientClassName = transportClientClassName;
-    }
-
-    public void setTransportClientProperties(String transportClientProperties) 
{
-        this.transportClientProperties = transportClientProperties;
-    }
-
-    public void setTransportClientJarDirectory(String 
transportClientJarDirectory) {
-        this.transportClientJarDirectory = transportClientJarDirectory;
-    }
-
     public void setMetricsService(MetricsService metricsService) {
         this.metricsService = metricsService;
     }
@@ -327,30 +304,21 @@ public class ElasticSearchPersistenceServiceImpl 
implements PersistenceService,
                 Settings.Builder transportSettings = Settings.builder()
                         .put(CLUSTER_NAME, clusterName);
 
-                if (StringUtils.isNotBlank(transportClientClassName) && 
StringUtils.isNotBlank(transportClientJarDirectory)) {
-                    logger.info("Connecting to ElasticSearch persistence 
backend using transport class " + transportClientClassName +
-                            " with JAR directory "+transportClientJarDirectory 
+
-                            " using cluster name " + clusterName + " and index 
name " + indexName + "...");
-                    client = newTransportClient(transportSettings, 
transportClientClassName, transportClientJarDirectory, 
transportClientProperties);
-                } else {
-                    logger.info("Connecting to ElasticSearch persistence 
backend using cluster name " + clusterName + " and index name " + indexName + 
"...");
-                    client = new 
PreBuiltTransportClient(transportSettings.build());
-                }
+                List<Node> nodeList = new ArrayList<>();
                 for (String elasticSearchAddress : elasticSearchAddressList) {
                     String[] elasticSearchAddressParts = 
elasticSearchAddress.split(":");
                     String elasticSearchHostName = 
elasticSearchAddressParts[0];
                     int elasticSearchPort = 
Integer.parseInt(elasticSearchAddressParts[1]);
-                    try {
-                        client.addTransportAddress(new 
InetSocketTransportAddress(InetAddress.getByName(elasticSearchHostName), 
elasticSearchPort));
-                    } catch (UnknownHostException e) {
-                        String message = "Error resolving address " + 
elasticSearchAddress + " ElasticSearch transport client not connected";
-                        throw new Exception(message, e);
-                    }
+                    nodeList.add(new Node(new HttpHost(elasticSearchHostName, 
elasticSearchPort, "http")));
                 }
 
+                logger.info("Connecting to ElasticSearch persistence backend 
using cluster name " + clusterName + " and index name " + indexName + "...");
+                client = new RestHighLevelClient(
+                        RestClient.builder(nodeList.toArray(new 
Node[nodeList.size()])));
+
                 // let's now check the versions of all the nodes in the 
cluster, to make sure they are as expected.
                 try {
-                    NodesInfoResponse nodesInfoResponse = 
client.admin().cluster().prepareNodesInfo()
+                    NodesInfoResponse nodesInfoResponse = 
client.cluster().prepareNodesInfo()
                             .all().execute().get();
 
                     org.elasticsearch.Version minimalVersion = 
org.elasticsearch.Version.fromString(minimalElasticSearchVersion);
@@ -384,8 +352,7 @@ public class ElasticSearchPersistenceServiceImpl implements 
PersistenceService,
 
                 while (!indexExists && tries < 20) {
 
-                    IndicesExistsResponse indicesExistsResponse = 
client.admin().indices().prepareExists(indexName).execute().actionGet();
-                    indexExists = indicesExistsResponse.isExists();
+                    indexExists = client.indices().exists(new 
GetIndexRequest(indexName), RequestOptions.DEFAULT);
                     tries++;
                     try {
                         Thread.sleep(100);
@@ -419,9 +386,7 @@ public class ElasticSearchPersistenceServiceImpl implements 
PersistenceService,
 
                 logger.info("Waiting for GREEN cluster status...");
 
-                client.admin().cluster().prepareHealth()
-                        .setWaitForGreenStatus()
-                        .get();
+                client.cluster().health(new 
ClusterHealthRequest().waitForGreenStatus(), RequestOptions.DEFAULT);
 
                 logger.info("Cluster status is GREEN");
 
@@ -438,29 +403,32 @@ public class ElasticSearchPersistenceServiceImpl 
implements PersistenceService,
         if (bulkProcessor != null) {
             return bulkProcessor;
         }
-        BulkProcessor.Builder bulkProcessorBuilder = BulkProcessor.builder(
-                client,
-                new BulkProcessor.Listener() {
-                    @Override
-                    public void beforeBulk(long executionId,
-                                           BulkRequest request) {
-                        logger.debug("Before Bulk");
-                    }
+        BulkProcessor.Listener bulkProcessorListener = new 
BulkProcessor.Listener() {
+            @Override
+            public void beforeBulk(long executionId,
+                                   BulkRequest request) {
+                logger.debug("Before Bulk");
+            }
 
-                    @Override
-                    public void afterBulk(long executionId,
-                                          BulkRequest request,
-                                          BulkResponse response) {
-                        logger.debug("After Bulk");
-                    }
+            @Override
+            public void afterBulk(long executionId,
+                                  BulkRequest request,
+                                  BulkResponse response) {
+                logger.debug("After Bulk");
+            }
+
+            @Override
+            public void afterBulk(long executionId,
+                                  BulkRequest request,
+                                  Throwable failure) {
+                logger.error("After Bulk (failure)", failure);
+            }
+        };
+        BulkProcessor.Builder bulkProcessorBuilder = BulkProcessor.builder(
+                (request, bulkListener) ->
+                        client.bulkAsync(request, RequestOptions.DEFAULT, 
bulkListener),
+                bulkProcessorListener);
 
-                    @Override
-                    public void afterBulk(long executionId,
-                                          BulkRequest request,
-                                          Throwable failure) {
-                        logger.error("After Bulk (failure)", failure);
-                    }
-                });
         if (bulkProcessorConcurrentRequests != null) {
             int concurrentRequests = 
Integer.parseInt(bulkProcessorConcurrentRequests);
             if (concurrentRequests > 1) {
@@ -778,7 +746,7 @@ public class ElasticSearchPersistenceServiceImpl implements 
PersistenceService,
                     for (int i = 0; i < scripts.length; i++) {
                         Script actualScript = new Script(ScriptType.INLINE, 
"painless", scripts[i], scriptParams[i]);
 
-                        client.admin().indices().prepareRefresh(index).get();
+                        client.indices().prepareRefresh(index).get();
 
                         UpdateByQueryRequestBuilder ubqrb = 
UpdateByQueryAction.INSTANCE.newRequestBuilder(client);
                         ubqrb.source(index).source().setTypes(itemType);
@@ -935,7 +903,7 @@ public class ElasticSearchPersistenceServiceImpl implements 
PersistenceService,
     public boolean indexTemplateExists(final String templateName) {
         Boolean result = new InClassLoaderExecute<Boolean>(metricsService, 
this.getClass().getName() + ".indexTemplateExists") {
             protected Boolean execute(Object... args) {
-                GetIndexTemplatesResponse getIndexTemplatesResponse = 
client.admin().indices().prepareGetTemplates(templateName).execute().actionGet();
+                GetIndexTemplatesResponse getIndexTemplatesResponse = 
client.indices().prepareGetTemplates(templateName).execute().actionGet();
                 return getIndexTemplatesResponse.getIndexTemplates().size() == 
1;
             }
         }.catchingExecuteInClassLoader(true);
@@ -949,7 +917,7 @@ public class ElasticSearchPersistenceServiceImpl implements 
PersistenceService,
     public boolean removeIndexTemplate(final String templateName) {
         Boolean result = new InClassLoaderExecute<Boolean>(metricsService, 
this.getClass().getName() + ".removeIndexTemplate") {
             protected Boolean execute(Object... args) {
-                DeleteIndexTemplateResponse deleteIndexTemplateResponse = 
client.admin().indices().deleteTemplate(new 
DeleteIndexTemplateRequest(templateName)).actionGet();
+                AcknowledgedResponse deleteIndexTemplateResponse = 
client.indices().deleteTemplate(new 
DeleteIndexTemplateRequest(templateName)).actionGet();
                 return deleteIndexTemplateResponse.isAcknowledged();
             }
         }.catchingExecuteInClassLoader(true);
@@ -988,7 +956,7 @@ public class ElasticSearchPersistenceServiceImpl implements 
PersistenceService,
                     }
                 }
                 putIndexTemplateRequest.mappings().putAll(indexMappings);
-                PutIndexTemplateResponse putIndexTemplateResponse = 
client.admin().indices().putTemplate(putIndexTemplateRequest).actionGet();
+                AcknowledgedResponse putIndexTemplateResponse = 
client.indices().putTemplate(putIndexTemplateRequest, RequestOptions.DEFAULT);
                 return putIndexTemplateResponse.isAcknowledged();
             }
         }.catchingExecuteInClassLoader(true);
@@ -1002,7 +970,7 @@ public class ElasticSearchPersistenceServiceImpl 
implements PersistenceService,
     public boolean createIndex(final String indexName) {
         Boolean result = new InClassLoaderExecute<Boolean>(metricsService, 
this.getClass().getName() + ".createItem") {
             protected Boolean execute(Object... args) {
-                IndicesExistsResponse indicesExistsResponse = 
client.admin().indices().prepareExists(indexName).execute().actionGet();
+                IndicesExistsResponse indicesExistsResponse = 
client.indices().prepareExists(indexName).execute().actionGet();
                 boolean indexExists = indicesExistsResponse.isExists();
                 if (!indexExists) {
                     Map<String, String> indexMappings = new HashMap<String, 
String>();
@@ -1027,10 +995,10 @@ public class ElasticSearchPersistenceServiceImpl 
implements PersistenceService,
     public boolean removeIndex(final String indexName) {
         Boolean result = new InClassLoaderExecute<Boolean>(metricsService, 
this.getClass().getName() + ".removeIndex") {
             protected Boolean execute(Object... args) {
-                IndicesExistsResponse indicesExistsResponse = 
client.admin().indices().prepareExists(indexName).execute().actionGet();
+                IndicesExistsResponse indicesExistsResponse = 
client.indices().prepareExists(indexName).execute().actionGet();
                 boolean indexExists = indicesExistsResponse.isExists();
                 if (indexExists) {
-                    
client.admin().indices().prepareDelete(indexName).execute().actionGet();
+                    
client.indices().prepareDelete(indexName).execute().actionGet();
                 }
                 return indexExists;
             }
@@ -1043,7 +1011,7 @@ public class ElasticSearchPersistenceServiceImpl 
implements PersistenceService,
     }
 
     private void internalCreateIndex(String indexName, Map<String, String> 
mappings) {
-        CreateIndexRequestBuilder builder = 
client.admin().indices().prepareCreate(indexName)
+        CreateIndexRequestBuilder builder = 
client.indices().prepareCreate(indexName)
                 .setSettings("{\n" +
                         "    \"index\" : {\n" +
                         "        \"number_of_shards\" : " + numberOfShards + 
",\n" +
@@ -1070,7 +1038,7 @@ public class ElasticSearchPersistenceServiceImpl 
implements PersistenceService,
 
 
     private void createMapping(final String type, final String source, final 
String indexName) {
-        client.admin().indices()
+        client.indices()
                 .preparePutMapping(indexName)
                 .setType(type)
                 .setSource(source, XContentType.JSON)
@@ -1084,11 +1052,11 @@ public class ElasticSearchPersistenceServiceImpl 
implements PersistenceService,
         }
         if (itemsMonthlyIndexed.contains(type)) {
             createMonthlyIndexTemplate();
-            if (client.admin().indices().prepareExists(indexName + 
"-*").execute().actionGet().isExists()) {
+            if (client.indices().prepareExists(indexName + 
"-*").execute().actionGet().isExists()) {
                 createMapping(type, source, indexName + "-*");
             }
         } else if (indexNames.containsKey(type)) {
-            if 
(client.admin().indices().prepareExists(indexNames.get(type)).execute().actionGet().isExists())
 {
+            if 
(client.indices().prepareExists(indexNames.get(type)).execute().actionGet().isExists())
 {
                 createMapping(type, source, indexNames.get(type));
             }
         } else {
@@ -1102,7 +1070,7 @@ public class ElasticSearchPersistenceServiceImpl 
implements PersistenceService,
             @SuppressWarnings("unchecked")
             protected Map<String, Map<String, Object>> execute(Object... args) 
throws Exception {
                 // Get all mapping for current itemType
-                GetMappingsResponse getMappingsResponse = 
client.admin().indices().prepareGetMappings().setTypes(itemType).execute().actionGet();
+                GetMappingsResponse getMappingsResponse = 
client.indices().prepareGetMappings().setTypes(itemType).execute().actionGet();
                 ImmutableOpenMap<String, ImmutableOpenMap<String, 
MappingMetaData>> mappings = getMappingsResponse.getMappings();
 
                 // create a list of Keys to get the mappings in chronological 
order
@@ -1701,7 +1669,7 @@ public class ElasticSearchPersistenceServiceImpl 
implements PersistenceService,
                 if (bulkProcessor != null) {
                     bulkProcessor.flush();
                 }
-                
client.admin().indices().refresh(Requests.refreshRequest()).actionGet();
+                client.indices().refresh(Requests.refreshRequest(), 
RequestOptions.DEFAULT);
                 return true;
             }
         }.catchingExecuteInClassLoader(true);
@@ -1714,7 +1682,7 @@ public class ElasticSearchPersistenceServiceImpl 
implements PersistenceService,
         new InClassLoaderExecute<Object>(metricsService, 
this.getClass().getName() + ".purgeWithDate") {
             @Override
             protected Object execute(Object... args) throws Exception {
-                IndicesStatsResponse statsResponse = 
client.admin().indices().prepareStats(indexName + "-*")
+                IndicesStatsResponse statsResponse = 
client.indices().prepareStats(indexName + "-*")
                         .setIndexing(false)
                         .setGet(false)
                         .setSearch(false)
@@ -1905,55 +1873,6 @@ public class ElasticSearchPersistenceServiceImpl 
implements PersistenceService,
         }
     }
 
-    public TransportClient newTransportClient(Settings.Builder settingsBuilder,
-                                              String transportClientClassName,
-                                              String 
transportClientJarDirectory,
-                                              String 
transportClientProperties) {
-
-        ArrayList<URL> urls = new ArrayList<>();
-        File pluginLocationFile = new File(transportClientJarDirectory);
-
-        File[] pluginLocationFiles = pluginLocationFile.listFiles();
-        for (File pluginFile : pluginLocationFiles) {
-            if (pluginFile.getName().toLowerCase().endsWith(".jar")) {
-                try {
-                    urls.add(pluginFile.toURI().toURL());
-                } catch (MalformedURLException e) {
-                    e.printStackTrace();
-                }
-            }
-        }
-
-        ChildFirstClassLoader childFirstClassLoader = new 
ChildFirstClassLoader(this.getClass().getClassLoader(), urls.toArray(new 
URL[urls.size()]));
-
-        if (StringUtils.isNotBlank(transportClientProperties)) {
-            String[] clientProperties = transportClientProperties.split(",");
-            if (clientProperties.length > 0) {
-                for (String clientProperty : clientProperties) {
-                    String[] clientPropertyParts = clientProperty.split("=");
-                    settingsBuilder.put(clientPropertyParts[0], 
clientPropertyParts[1]);
-                }
-            }
-        }
-
-        try {
-            Class<?> transportClientClass = 
childFirstClassLoader.loadClass(transportClientClassName);
-            Constructor<?> transportClientConstructor = 
transportClientClass.getConstructor(Settings.class, Class[].class);
-            return (TransportClient) 
transportClientConstructor.newInstance(settingsBuilder.build(), new Class[0]);
-        } catch (ClassNotFoundException e) {
-            logger.error("Couldn't find class " + transportClientClassName, e);
-        } catch (NoSuchMethodException e) {
-            logger.error("Error creating transport client with class" + 
transportClientClassName, e);
-        } catch (IllegalAccessException e) {
-            logger.error("Error creating transport client with class" + 
transportClientClassName, e);
-        } catch (InstantiationException e) {
-            logger.error("Error creating transport client with class" + 
transportClientClassName, e);
-        } catch (InvocationTargetException e) {
-            logger.error("Error creating transport client with class" + 
transportClientClassName, e);
-        }
-        return null;
-    }
-
     private <T extends Item> boolean isCacheActiveForClass(String className) {
         if (itemClassesToCacheSet.contains("*")) {
             return true;

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