1 Reply Latest reply on Sep 23, 2008 2:48 AM by Konstantin Sobolev

    read-only cmp bean

    Konstantin Sobolev Newbie


      I'm trying to figure out how to implement read-only CMP 2.0 bean in JBoss 4.x

      My current attempt to define it like this doesn't work:

       * ...
       * @jboss.read-only "true"
      public abstract class MyBean implements EntityBean {
       * @ejb.pk-field
       * @ejb.persistence
       * @ejb.interface-method view-type="local"
       * @jboss.column-name "foo"
       public abstract Long getFoo();
       public abstract void setFoo(Long newValue);
       * @ejb:create-method
       * @ejb:transaction type="Required"
       public MyPK ejbCreate(Long foo)
       throws CreateException {
       setFoo(foo); //throws exception
       return null;

      This essentially results in this code in jbosscmp-jdbc.xml:


      However, an attempt to create such beans leads to exception in JBoss 4.x:

      Caused by: javax.ejb.EJBException: Field is read-only: fieldName=foo
       at org.jboss.ejb.plugins.cmp.jdbc.bridge.JDBCAbstractCMPFieldBridge.setValue(JDBCAbstractCMPFieldBridge.java:232)
       at org.jboss.ejb.plugins.cmp.bridge.EntityBridgeInvocationHandler$FieldSetInvoker.invoke(EntityBridgeInvocationHandler.java:170)
       at org.jboss.ejb.plugins.cmp.bridge.EntityBridgeInvocationHandler.invoke(EntityBridgeInvocationHandler.java:105)
       at org.jboss.proxy.compiler.Runtime.invoke(Runtime.java:76)
       at xxx.MyCMP$Proxy.setFoo(<generated>)
       at xxx.MyBean.ejbCreate(MyBean.java:114)

      How am I supposed to create instances without calling set* methods from ejbCreate?

      May be I'm wrong, but this piece in JDBCAbstractCMPFieldBridge.java looks suspicious:

       public void setValue(EntityEnterpriseContext ctx, Object value)
       throw new EJBException("Field is read-only: fieldName=" + fieldName);
       if(primaryKeyMember && JDBCEntityBridge.isEjbCreateDone(ctx))
       throw new IllegalStateException("A CMP field that is a member " +
       "of the primary key can only be set in ejbCreate " +
       "[EJB 2.0 Spec. 10.3.5].");

      I'd expect it to be something along "if(isReadOnly() && !JDBCEntityBridge.isEjbCreateDone(ctx))". This souldn't mark an instance as dirty one of course.