2 Replies Latest reply on Oct 22, 2001 5:17 AM by Christian Riege

    javax.ejb.RemoveException: Could not remove null

    Kristof Geukens Newbie

      Hi,

      I recently noticed an annoying problem while testing my application
      and still got the same error when I test a trivial bean.

      I'm using JBoss 2.4.1 and let XDoclet generate the ejb-related classes.

      TestBean is just a simple CMP bean with one primary key field and one other persistent field.
      When I insert an item that I've previously removed, I can't remove that item anymore.
      The client can find the remote object for that item, but when ejbRemote() is invoked,
      the primary key object seems to be reset to null.
      I can still call the "get" and "set" methods on this item.

      Here's the bean's ejbRemove method:

      public void ejbRemove() throws RemoveException {
      try {
      System.out.println( "[Test] PK : " + entityContext.getPrimaryKey().toString() );
      }
      catch( Exception e ) {
      System.out.println( "[Test] PK : " + e );
      }
      System.out.println( "[Test] ejbRemove()" );
      }

      The logfile shows that the recently removed items still get passivated:

      2001-10-18 16:47:46,438 [Default] [TestServlet] adding new value...
      2001-10-18 16:47:46,478 [Default] [Test] setEntityContext()
      2001-10-18 16:47:46,478 [Default] [Test] ejbCreate()
      2001-10-18 16:47:46,488 [Default] [Test] ejbStore()
      2001-10-18 16:47:46,488 [Test] Scheduled passivation of bean Test with id = [.key.]
      2001-10-18 16:47:46,488 [Default] [Test] ejbPassivate()
      2001-10-18 16:47:46,488 [Container factory] Passivated bean Test with id = [.key.]
      2001-10-18 16:47:49,012 [Default] [TestServlet] removing item [.key.]...
      2001-10-18 16:47:49,022 [Default] [Test] setEntityContext()
      2001-10-18 16:47:49,032 [Default] [Test] setEntityContext()
      2001-10-18 16:47:49,032 [Default] [Test] ejbActivate()
      2001-10-18 16:47:49,032 [Test] Activated bean Test with id = [.key.]
      2001-10-18 16:47:49,042 [Default] [Test] ejbLoad()
      2001-10-18 16:47:49,042 [Default] [Test] PK : [.key.]
      2001-10-18 16:47:49,042 [Default] [Test] ejbRemove()
      2001-10-18 16:47:49,052 [Test] Scheduled passivation of bean Test with id = [.key.]
      2001-10-18 16:47:56,192 [Default] [TestServlet] adding new value...
      2001-10-18 16:47:56,202 [Default] [Test] setEntityContext()
      2001-10-18 16:47:56,202 [Default] [Test] ejbCreate()
      2001-10-18 16:47:56,202 [Default] [Test] ejbStore()
      2001-10-18 16:47:56,212 [Test] Scheduled passivation of bean Test with id = [.key.]
      2001-10-18 16:47:59,076 [Default] [TestServlet] removing item [.key.]...
      2001-10-18 16:47:59,096 [Default] [Test] setEntityContext()
      2001-10-18 16:47:59,096 [Default] [Test] PK : java.lang.NullPointerException
      2001-10-18 16:47:59,096 [Default] [Test] ejbRemove()
      2001-10-18 16:47:59,106 [Test] Scheduled passivation of bean Test with id = [.key.]
      2001-10-18 16:47:59,106 [Default] [TestServlet] remove : javax.ejb.RemoveException: Could not remove null

      This is what happens in Hypersonic during that test:

      INSERT INTO TEST VALUES('key','first insert')
      DELETE FROM TEST WHERE KEY='key' AND CONTENT='first insert'
      INSERT INTO TEST VALUES('key','first insert')
      COMMIT
      COMMIT
      DELETE FROM TEST WHERE KEY='key' AND CONTENT='first insert'
      COMMIT
      INSERT INTO TEST VALUES('key','second insert')
      DELETE FROM TEST WHERE KEY='key' AND CONTENT='second insert'
      INSERT INTO TEST VALUES('key','second insert')
      COMMIT
      COMMIT
      COMMIT


      Is this maybe a silly problem that somebody can fix
      or can anybody give me a clue about what the problem might be ...

      Thanks,
      Kristof