[jboss-user] [Persistence, JBoss/CMP, Hibernate, Database] - read-only cmp bean

[eprst]

Hi

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:


  |       <entity>
  |          <ejb-name>My</ejb-name>
  |          <read-only>true</read-only>
  |          <table-name>xxx</table-name>
  | 
  |          <cmp-field>
  |             <field-name>foo</field-name>
  |             <column-name>foo</column-name>
  |         </cmp-field>
  | etc
  | 

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)
  |    {
  |       if(isReadOnly())
  |       {
  |          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.

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