QueryCacheStoreQuery$CachedObjectId that is not Serializable
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Key: OPENJPA-1901
URL: https://issues.apache.org/jira/browse/OPENJPA-1901
Project: OpenJPA
Issue Type: Bug
Components: datacache
Affects Versions: 2.0.1, 2.0.0
Reporter: Kevin Sutter
In OpenJPA 2.0, OpenJPA tries to put the query result from JOIN query into
query cache, in addition to put entities into data cache.
However, the QueryResult containes Object[] of
org.apache.openjpa.datacache.QueryCacheStoreQuery$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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