[jira] [Created] (GEODE-7746) An onServers function throws a NullPointerException if the distributed system is shutdown

["Barrett Oglesby (Jira)" <ji...@apache.org>]

Barrett Oglesby created GEODE-7746:
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             Summary: 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


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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