Issue #825: [ObjectDB 2.4.1] Unexpected exception (Error 990)

Hi, getting this unexpected exception, would welcome advice:

[ObjectDB 2.4.1] Unexpected exception (Error 990)
  Generated by Java HotSpot(TM) Client VM 1.6.0_29 (on Windows 7 6.1).
Please report this error on http://www.objectdb.com/database/issue/new
com.objectdb.o.InternalException: java.lang.NullPointerException: null
java.lang.NullPointerException
at com.objectdb.o.QPR.q(QPR.java:198)
at com.objectdb.o.QPR.p(QPR.java:179)
at com.objectdb.o.QPR.o(QPR.java:140)
at com.objectdb.o.QRC.<init>(QRC.java:121)
at com.objectdb.o.QRM.U5(QRM.java:248)
at com.objectdb.o.MST.U5(MST.java:953)
at com.objectdb.o.WRA.U5(WRA.java:290)
at com.objectdb.o.WSM.U5(WSM.java:113)
at com.objectdb.o.QRR.g(QRR.java:232)
at com.objectdb.o.QRR.b(QRR.java:151)
at com.objectdb.jpa.JpaQuery.executeUpdate(JpaQuery.java:743)
at com.sky.epg.repository.AbstractBaseRepository.deleteAll(AbstractBaseRepository.java:32)
at com.sky.epg.repository.AbstractBaseRepository$$FastClassByCGLIB$$ed5c6975.invoke(<generated>)
at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:191)
at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:617)
at com.sky.epg.repository.BufferItemRepositoryImpl2$$EnhancerByCGLIB$$ad04659b.deleteAll(<generated>)
at com.sky.epg.buffer.ObjectdbBufferStoreIT.cleanUp(ObjectdbBufferStoreIT.java:57)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:82)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:240)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:180)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

The stack trace indicates a missing (or empty) FROM clause in a DELETE query.

Could you please post the query and/or the code that causes this?

Of course, a better error message should be produced if the query is invalid.  

This exception can be reproduced by the following test program with invalid DELETE query:

import javax.persistence.*;

public class T825 {

    public static void main(String[] args) {
        EntityManagerFactory emf =
            Persistence.createEntityManagerFactory("objectdb:d:\\temp\\test.tmp;drop");
        EntityManager em = emf.createEntityManager();
        em.getTransaction().begin();
        em.createQuery("DELETE o").executeUpdate();
        em.getTransaction().commit();
        em.close();
        emf.close();
    }
}

A better error message is produced by build 2.4.1_01.