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From "Jonathan Feinberg (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-181) ClassCastException when executing bulk delete on an entity that owns a OneToOne with a Cascade.DELETE when DataCache is on
Date Mon, 26 Mar 2007 15:27:32 GMT
ClassCastException when executing bulk delete on an entity that owns a OneToOne with a Cascade.DELETE
when DataCache is on
--------------------------------------------------------------------------------------------------------------------------

                 Key: OPENJPA-181
                 URL: https://issues.apache.org/jira/browse/OPENJPA-181
             Project: OpenJPA
          Issue Type: Bug
          Components: kernel
    Affects Versions: 0.9.7
            Reporter: Jonathan Feinberg


Given an entity class A which owns a OneToOne entity of class B, and given a cascade on that
OneToOne that includes DELETE, an attempt to bulk-delete A when using the DataCache results
in a stack trace like the following:

java.lang.ClassCastException: org.apache.openjpa.datacache.QueryCacheStoreQuery cannot be
cast to org.apache.openjpa.kernel.ExpressionStoreQuery
    at org.apache.openjpa.kernel.ExpressionStoreQuery$DataStoreExecutor.executeQuery(ExpressionStoreQuery.java:674)
    at org.apache.openjpa.kernel.QueryImpl.execute(QueryImpl.java:979)
    at org.apache.openjpa.kernel.QueryImpl.deleteInMemory(QueryImpl.java:1005)
    ... 28 more

The proximate cause for the bug is that when the JDBCStoreQuery does this:

    private Table getTable(FieldMapping fm, Table table) {
        if (fm.getCascadeDelete() != ValueMetaData.CASCADE_NONE)
            return INVALID;

it causes "isSingleTableMapping" to be considered false, which in turn permits executeBulkOperation
to return null. Meanwhile, back in DataStoreExecutor:

       public Number executeDelete(StoreQuery q, Object[] params) {
            Number num = ((ExpressionStoreQuery) q).executeDelete(this, _meta,
                _metas, _subs, _facts, _exps, params);
            if (num == null)
                return q.getContext().deleteInMemory(this, params);   // <- now we have
come here because executeDelete punted
            return num;
        }

So deleteInMemory gets called in QueryImpl:

   public Number deleteInMemory(StoreQuery.Executor executor,
        Object[] params) {
        try {
            Object o = execute(executor, params);

, but a DataStoreExecutor doesn't know how to execute the QueryCacheStoreQuery that it gets.

Somehwere, something is too unwrapped, or not wrapped enough. Good luck!

Workaround:

If A owns B, then instead of cascade=CascadeType.ALL, you can

@Entity
class A {
    B myThing;

    @OneToOne(cascade = { CascadeType.PERSIST, CascadeType.MERGE, CascadeType.REFRESH })
   B getMyThing() { return myThing; }
}

@Entity
class B {
    A owner;

    @ForeignKey(deleteAction=ForeignKeyAction.CASCADE)
    A getOwner() { return owner; }
}

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