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From "Kevin Sutter (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-1901) QueryCacheStoreQuery$CachedObjectId that is not Serializable
Date Tue, 30 Nov 2010 16:30:10 GMT
QueryCacheStoreQuery$CachedObjectId that is not Serializable
------------------------------------------------------------

                 Key: OPENJPA-1901
                 URL: https://issues.apache.org/jira/browse/OPENJPA-1901
             Project: OpenJPA
          Issue Type: Bug
          Components: datacache
    Affects Versions: 2.0.1, 2.0.0
            Reporter: Kevin Sutter


In OpenJPA 2.0, OpenJPA tries to put the query result from JOIN query into query cache, in
addition to put entities into data cache.
However, the QueryResult containes Object[] of org.apache.openjpa.datacache.QueryCacheStoreQuery$CachedObjectId
that is not Serializable and cause this issue.
OpenJPA need to be fixed to make org.apache.openjpa.datacache.QueryCacheStoreQuery$CachedObjectId
serializable.

Currently,  manually adding Serializable to the code works for measuring the performance,
but we need a more permanent fix.

I also have a concern whether this type of fix has a ripple effect.  The CachedObjectId can
easily be fixed to be Serializable, but it looks like other inner classes of QueryCacheStoreQuery
are not Serializable either.  Do these (and potentially other attributes) need to be Serializable
as well?  Do we need a Unit Test to verify this Serializable capability?

Final portion of call stack when the Exception happens:

Caused by: java.io.NotSerializableException: org.apache.openjpa.datacache.QueryCacheStoreQuery$CachedObjectId
	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1113)
	at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1343)
	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1107)
	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:325)
	at java.util.ArrayList.writeObject(ArrayList.java:595)
	at sun.reflect.GeneratedMethodAccessor20.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:618)
	at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:972)
	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1431)
	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1382)
	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1111)
	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:325)



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