[GitHub] [zookeeper] sonatype-lift[bot] commented on a diff in pull request #1979: refactor: Use diamond operator

[via GitHub]

sonatype-lift[bot] commented on code in PR #1979:
URL: https://github.com/apache/zookeeper/pull/1979#discussion_r1097578524


##########
zookeeper-server/src/main/java/org/apache/zookeeper/ZooKeeperMain.java:
##########
@@ -207,7 +207,7 @@ public boolean parseOptions(String[] args) {
         public boolean parseCommand(String cmdstring) {
             Matcher matcher = ARGS_PATTERN.matcher(cmdstring);
 
-            List<String> args = new LinkedList<String>();
+            List<String> args = new LinkedList<>();

Review Comment:
   <picture><img alt="16% of developers fix this issue" 
src="https://lift.sonatype.com/api/commentimage/fixrate/16/display.svg";></picture>
   
   *[JdkObsolete](https://errorprone.info/bugpattern/JdkObsolete):*  It is very 
rare for LinkedList to out-perform ArrayList or ArrayDeque. Avoid it unless 
you're willing to invest a lot of time into benchmarking. Caveat: LinkedList 
supports null elements, but ArrayDeque does not.
   
   ---
   
   
   ```suggestion
               List<String> args = new ArrayList<>();
   ```
   
   
   ---
   
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##########
zookeeper-server/src/main/java/org/apache/zookeeper/server/DataTree.java:
##########
@@ -781,7 +781,7 @@ public List<ACL> getACL(String path, Stat stat) throws 
KeeperException.NoNodeExc
             if (stat != null) {
                 n.copyStat(stat);
             }
-            return new ArrayList<ACL>(aclCache.convertLong(n.acl));
+            return new ArrayList<>(aclCache.convertLong(n.acl));

Review Comment:
   <picture><img alt="5% of developers fix this issue" 
src="https://lift.sonatype.com/api/commentimage/fixrate/5/display.svg";></picture>
   
   *THREAD_SAFETY_VIOLATION:*  Read/Write race. Non-private method 
`DataTree.getACL(...)` indirectly reads with synchronization from container 
`this.aclCache.longKeyMap` via call to `Map.get(...)`. Potentially races with 
unsynchronized write in method `DataTree.deserialize(...)`.
    Reporting because this access may occur on a background thread.
   
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