Getting ClassCastException if the QueryResultsCachePolicy is set

hi,
the code down below is executed without any problem if the line:
query.setQueryResultsCachePolicy(....)
is commented out.
ReadAllQuery query = new ReadAllQuery(exampleObject.getClass());
query.useMapClass(TreeMap.class, propertyName);
query.setExampleObject(exampleObject);
query.setQueryByExamplePolicy(policy);
==> query.setQueryResultsCachePolicy(new QueryResultsCachePolicy(new TimeToLiveCacheInvalidationPolicy(60000)));
TreeMap<Serializable, T> result = (TreeMap<Serializable, T>) persistence.getSession().executeQuery(query);
return result;
Uncommenting the same line result ClassCastException:
Caused by: java.lang.ClassCastException: java.util.TreeMap
at oracle.toplink.queryframework.ReadAllQuery.cacheResult(ReadAllQuery.java:213)
at oracle.toplink.internal.descriptors.ObjectBuilder.buildObject(ObjectBuilder.java:441)
at oracle.toplink.internal.descriptors.ObjectBuilder.buildObjectsInto(ObjectBuilder.java:746)
at oracle.toplink.internal.queryframework.DatabaseQueryMechanism.buildObjectsFromRows(DatabaseQueryMechanism.java:170)
at oracle.toplink.queryframework.ReadAllQuery.executeObjectLevelReadQuery(ReadAllQuery.java:477)
at oracle.toplink.queryframework.ObjectLevelReadQuery.executeDatabaseQuery(ObjectLevelReadQuery.java:874)
at oracle.toplink.queryframework.DatabaseQuery.execute(DatabaseQuery.java:671)
at oracle.toplink.queryframework.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:835)
at oracle.toplink.queryframework.ReadAllQuery.execute(ReadAllQuery.java:445)
at oracle.toplink.internal.sessions.AbstractSession.internalExecuteQuery(AbstractSession.java:2293)
at oracle.toplink.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1107)
at oracle.toplink.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1091)
at oracle.toplink.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1050)
I'm using:
TopLink, version: Oracle TopLink - 11g Technology Preview 3 (11.1.1.0.0) (Build 071214)
Could you please tell me what I'm doing wrong
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Getting ClassCastException if the QueryResultsCachePolicy is set

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