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https://issues.apache.org/jira/browse/GEODE-7746?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17039362#comment-17039362
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ASF subversion and git services commented on GEODE-7746:
--------------------------------------------------------
Commit 54890b3e28bb992a0c1a6069b62de065034d2df4 in geode's branch
refs/heads/develop from Jianxia Chen
[ https://gitbox.apache.org/repos/asf?p=geode.git;h=54890b3 ]
GEODE-7746: onServers function throws a NPE if the distributed system is
shutdown (#4690)
* GEODE-7746: Fix the NullPointerException on Function Execution
The NullPointerException of GEODE-7746 can be reproduced by
ClientServerSessionCacheDUnitTest.startingAClientWithoutServersFails()
Add null check and throw NoAvailableServersException
> An onServers function throws a NullPointerException if the distributed system
> is shutdown
> -----------------------------------------------------------------------------------------
>
> Key: GEODE-7746
> URL: https://issues.apache.org/jira/browse/GEODE-7746
> Project: Geode
> Issue Type: Bug
> Components: functions
> Reporter: Barrett Oglesby
> Assignee: Jianxia Chen
> Priority: Major
> Labels: GeodeCommons
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> I have a distributed system with a locator and 3 servers. I then start a
> client executing an onServers function forever.
> The client is doing this in a loop:
> {noformat}
> FunctionService.onServers(this.cache).execute("TestFunction").getResult();
> {noformat}
> If I stop the distributed system using gfsh like:
> {noformat}
> gfsh shutdown --include-locators=true
> {noformat}
> The client throws a NullPointerException like:
> {noformat}
> org.apache.geode.cache.execute.FunctionException:
> java.lang.NullPointerException
> at
> org.apache.geode.internal.cache.execute.ServerFunctionExecutor.executeOnServer(ServerFunctionExecutor.java:234)
> at
> org.apache.geode.internal.cache.execute.ServerFunctionExecutor.executeFunction(ServerFunctionExecutor.java:104)
> at
> org.apache.geode.internal.cache.execute.ServerFunctionExecutor.execute(ServerFunctionExecutor.java:368)
> at
> org.apache.geode.internal.cache.execute.ServerFunctionExecutor.execute(ServerFunctionExecutor.java:377)
> at TestClient.executeFunction(TestClient.java:23)
> at TestClient.executeFunctionForever(TestClient.java:34)
> at TestClient.main(TestClient.java:15)
> Caused by: java.lang.NullPointerException
> at
> org.apache.geode.cache.client.internal.ExecuteFunctionOp.constructAndGetFunctionTasks(ExecuteFunctionOp.java:131)
> at
> org.apache.geode.cache.client.internal.ExecuteFunctionOp.execute(ExecuteFunctionOp.java:79)
> at
> org.apache.geode.internal.cache.execute.ServerFunctionExecutor.executeOnServer(ServerFunctionExecutor.java:217)
> {noformat}
> The NPNullPointerExceptionE is in
> ExecuteFunctionOp.constructAndGetFunctionTasks here:
> {noformat}
> List<ServerLocation> servers = pool.getConnectionSource().getAllServers();
> {noformat}
> In this case, servers is null.
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