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https://issues.apache.org/jira/browse/GEODE-5198?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bruce Schuchardt reassigned GEODE-5198:
---------------------------------------
Assignee: Bruce Schuchardt
> NPE in DataSerializer registration when forming a client/server connection
> during handshake
> -------------------------------------------------------------------------------------------
>
> Key: GEODE-5198
> URL: https://issues.apache.org/jira/browse/GEODE-5198
> Project: Geode
> Issue Type: Improvement
> Components: client/server, serialization
> Reporter: Bruce Schuchardt
> Assignee: Bruce Schuchardt
> Priority: Major
> Fix For: 1.7.0
>
>
> Someone hit an NPE when forming a connection to a server in an application
> making heavy use of custom DataSerializers. I wrote a unit test to reproduce
> the problem (attached) which produces this:
> {noformat}
> java.lang.NullPointerException
> at
> java.util.concurrent.ConcurrentHashMap.putVal(ConcurrentHashMap.java:1011)
> at
> java.util.concurrent.ConcurrentHashMap.putIfAbsent(ConcurrentHashMap.java:1535)
> at
> org.apache.geode.internal.InternalDataSerializer.updateSupportedClassesMap(InternalDataSerializer.java:1079)
> at
> org.apache.geode.internal.DataSerializerHolderJUnitTest$1.run(DataSerializerHolderJUnitTest.java:72)
> {noformat}
> The problem is in the idsToHolders map in InternalDataSerializer. This map is
> initialized with a "holder" object that knows the name and ID of a
> DataSerializer. During tcp/ip connection formation one of these is created
> when processing a list of DataSerializers sent to the client by the server as
> part of the handshake. Then the server sends a map of the names of classes
> supported by the serializers. It's in this second step that we're hitting the
> NPE because some other thread has resolved the holder into an actual class
> and has removed the holder from the idsToHolders map. This can be done in any
> of three other methods in InternalDataSerializer that are used as a matter of
> course in serializing/deserializing objects.
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