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https://issues.apache.org/jira/browse/OPENJPA-2502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13993720#comment-13993720
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Albert Lee commented on OPENJPA-2502:
-------------------------------------
The NPE comes from the following code fragment in createKey() where
q.getAccessPathMetaDatas() returns
[null, test.Department] and subsequent meta.getDescribedType() on the first
element takes the NPE.
// we can't cache the query if we don't know which classes are in the
// access path
ClassMetaData[] metas = q.getAccessPathMetaDatas();
if (metas.length == 0)
return null;
Set<String> accessPathClassNames = new HashSet<String>((int)
(metas.length * 1.33 + 1));
ClassMetaData meta;
for (int i = 0; i < metas.length; i++) {
// since the class change framework deals with least-derived types,
// record the least-derived access path types
meta = metas[i];
accessPathClassNames.add(meta.getDescribedType().getName()); <<<<
NPE
while (meta.getPCSuperclass() != null) {
meta = meta.getPCSuperclassMetaData();
}
accessPathClassNames.add(meta.getDescribedType().getName());
}
> NPE in QueryKey.createKey using criteria with QueryCache enabled
> ----------------------------------------------------------------
>
> Key: OPENJPA-2502
> URL: https://issues.apache.org/jira/browse/OPENJPA-2502
> Project: OpenJPA
> Issue Type: Bug
> Components: criteria, datacache
> Affects Versions: 2.2.1, 2.2.2
> Reporter: Albert Lee
> Attachments: OPENJPA-2502.test.zip
>
>
> Running an example in the spec using Criteria API with "left join fetch" AND
> query cache enabled yield the following NPE exception. See the testcase to
> reproduce the problem and the spec section where the example comes from:
> <openjpa-2.2.1.1-SNAPSHOT-r422266:1438134 nonfatal user error>
> org.apache.openjpa.persistence.ArgumentException: Failed to execute query
> "null". Check the query syntax for correctness. See nested exception for
> details.
> at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:872)
> at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:794)
> at
> org.apache.openjpa.kernel.DelegatingQuery.execute(DelegatingQuery.java:542)
> at org.apache.openjpa.persistence.QueryImpl.execute(QueryImpl.java:286)
> at
> org.apache.openjpa.persistence.QueryImpl.getResultList(QueryImpl.java:302)
> at com.ibm.ws.persistence.QueryImpl.getResultList(QueryImpl.java:118)
> at test.TestNPE.test(TestNPE.java:62)
> ......
> Caused by: java.lang.NullPointerException
> at org.apache.openjpa.datacache.QueryKey.createKey(QueryKey.java:203)
> at org.apache.openjpa.datacache.QueryKey.newInstance(QueryKey.java:139)
> at
> org.apache.openjpa.datacache.QueryCacheStoreQuery$QueryCacheExecutor.executeQuery(QueryCacheStoreQuery.java:339)
> at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:1005)
> at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:863)
> ... 33 more
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