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https://issues.apache.org/jira/browse/GEODE-2236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15802824#comment-15802824
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ASF GitHub Bot commented on GEODE-2236:
---------------------------------------
Github user kjduling commented on the issue:
https://github.com/apache/geode/pull/327
+1
> Attempting to remove all CacheListeners from a Region using gfsh throws
> NullPointerException
> --------------------------------------------------------------------------------------------
>
> Key: GEODE-2236
> URL: https://issues.apache.org/jira/browse/GEODE-2236
> Project: Geode
> Issue Type: Bug
> Components: gfsh
> Reporter: Kevin Duling
> Assignee: Deepak Dixit
>
> The --cache-listener option to the alter region command replaces the existing
> CacheListeners with the ones set in the option.
> What happens in RegionAlterFunction is that the existing CacheListeners not
> included in the new list are removed, then the new ones are added.
> So, in theory, to remove all CacheListeners, an empty string could be passed
> into the --cache-listener option like:
> {noformat}
> alter region --name=data --cache-listener=''
> Executing - alter region --name=data --cache-listener=""
> Member | Status
> ------- |
> ----------------------------------------------------------------------
> server2 | ERROR: java.lang.NullPointerException
> at com.gemstone.gemfire.manag..
> server1 | ERROR: java.lang.NullPointerException
> at com.gemstone.gemfire.manag..
> {noformat}
> This actually works but it throws the NPE below.
> {noformat}
> [error 2016/09/13 09:48:59.943 PDT server1 <Function Execution Processor1>
> tid=0x40]
> java.lang.NullPointerException
> at
> com.gemstone.gemfire.management.internal.cli.functions.RegionAlterFunction.newInstance(RegionAlterFunction.java:320)
> at
> com.gemstone.gemfire.management.internal.cli.functions.RegionAlterFunction.alterRegion(RegionAlterFunction.java:228)
> at
> com.gemstone.gemfire.management.internal.cli.functions.RegionAlterFunction.execute(RegionAlterFunction.java:64)
> at
> com.gemstone.gemfire.internal.cache.MemberFunctionStreamingMessage.process(MemberFunctionStreamingMessage.java:185)
> at
> com.gemstone.gemfire.distributed.internal.DistributionMessage.scheduleAction(DistributionMessage.java:386)
> at
> com.gemstone.gemfire.distributed.internal.DistributionMessage$1.run(DistributionMessage.java:457)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at
> com.gemstone.gemfire.distributed.internal.DistributionManager.runUntilShutdown(DistributionManager.java:692)
> at
> com.gemstone.gemfire.distributed.internal.DistributionManager$9$1.run(DistributionManager.java:1149)
> at java.lang.Thread.run(Thread.java:745)
> {noformat}
> A work-around to this issue is to set a non-existent CacheListener in the
> --cache-listener option like:
> {noformat}
> alter region --name=data --cache-listener=Fred
> Executing - alter region --name=data --cache-listener=Fred
> Member | Status
> ------- | ------------------------------------------------------------------
> server1 | ERROR: Could not find class "Fred" specified for "cache-listener".
> server2 | ERROR: Could not find class "Fred" specified for "cache-listener".
> {noformat}
> This correctly throws the ClassNotFoundException below and also removes all
> the existing CacheListeners.
> {noformat}
> [error 2016/09/13 09:46:40.537 PDT server1 <Function Execution Processor1>
> tid=0x40] Could not find class "Fred" specified for "cache-listener".
> java.lang.RuntimeException: Could not find class "Fred" specified for
> "cache-listener".
> at
> com.gemstone.gemfire.management.internal.cli.functions.RegionAlterFunction.forName(RegionAlterFunction.java:306)
> at
> com.gemstone.gemfire.management.internal.cli.functions.RegionAlterFunction.alterRegion(RegionAlterFunction.java:227)
> at
> com.gemstone.gemfire.management.internal.cli.functions.RegionAlterFunction.execute(RegionAlterFunction.java:64)
> at
> com.gemstone.gemfire.internal.cache.MemberFunctionStreamingMessage.process(MemberFunctionStreamingMessage.java:185)
> at
> com.gemstone.gemfire.distributed.internal.DistributionMessage.scheduleAction(DistributionMessage.java:386)
> at
> com.gemstone.gemfire.distributed.internal.DistributionMessage$1.run(DistributionMessage.java:457)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at
> com.gemstone.gemfire.distributed.internal.DistributionManager.runUntilShutdown(DistributionManager.java:692)
> at
> com.gemstone.gemfire.distributed.internal.DistributionManager$9$1.run(DistributionManager.java:1149)
> at java.lang.Thread.run(Thread.java:745)
> Caused by: java.lang.ClassNotFoundException: Fred
> at
> com.gemstone.gemfire.internal.ClassPathLoader.forName(ClassPathLoader.java:422)
> at
> com.gemstone.gemfire.management.internal.cli.functions.RegionAlterFunction.forName(RegionAlterFunction.java:303)
> ... 10 more
> {noformat}
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