Remove related entity, oracle.toplink.essentials.indirection.IndirectList

Question

I have two entities autogenerated by the jdev 10.1.3.1 JPA wizard, Proveedor(codprov varchar2 PK) having n Lineas(codprov varchar2 PK, Codline varchar2 PK) related as:
in entity Proveedor:
private List<Linea> lineas;
@OneToMany(mappedBy="proveedor")
public List<Linea> getLineas() {
return lineas;
public Linea removeLinea(Linea linea) {
System.out.println(" is at:" + getLineas().indexOf(linea));
getLineas().remove(linea);
linea.setProveedor(null);
return linea;
in Linea:
@Id
@ManyToOne
@JoinColumn(name="CODPROV", referencedColumnName="CODPROV")
public Proveedor getProveedor() {
return proveedor;
the delete method on the service bean is :
public void delLinea( String codprov,String codline){
EntityManager em = jpaResourceBean.getEntityManager();
try{
em.getTransaction().begin();
Linea linea = em.find(Linea.class, new LineaPK(codprov, codline));
em.remove(linea);
em.getTransaction().commit();
linea.getProveedor().removeLinea(linea);
finally {
em.close();
when i try to remove the entity linea calling delLinea on the service bean
the List (oracle.toplink.essentials.indirection.IndirectList) is NOT removing the entity linea, the system output show that is not there:
     06/08/30 16:59:23 is at:-1
the relationship is not lost, as linea.getProveedor().removeLinea(linea); works so it's being held ok (at least from Linea to Proveedor)
what i'm doing wrong, is IndirectList is mantaining copies of the related entities ??

Answer 1

thank you, after reading your reply i tried this:
public void delLinea( String codprov,String codline){
EntityManager em = jpaResourceBean.getEntityManager();
try{
em.getTransaction().begin();
Linea linea = em.find(Linea.class, new LineaPK(codprov, codline));
linea.getProveedor().removeLinea(linea);
em.remove(linea);
em.getTransaction().commit();
finally {
em.close();
As you advised, I'm reading the Proveedor in the transaction and clearing the relation before removing the entity Linea, but em.getTransaction().commit() throws:
GRAVE: #{ProveedorBean.linea_Del}: javax.faces.el.EvaluationException: javax.persistence.RollbackException: java.lang.NullPointerException
javax.faces.FacesException: #{ProveedorBean.linea_Del}: javax.faces.el.EvaluationException: javax.persistence.RollbackException: java.lang.NullPointerException
     at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:98)
     at oracle.adf.view.faces.component.UIXCommand.broadcast(UIXCommand.java:211)
     at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:287)
     at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:401)
     at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:95)
     at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:245)
     at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:110)
     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:213)
     at com.evermind.server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java:64)
     at oracle.adfinternal.view.faces.webapp.AdfFacesFilterImpl._invokeDoFilter(AdfFacesFilterImpl.java:367)
     at oracle.adfinternal.view.faces.webapp.AdfFacesFilterImpl._doFilterImpl(AdfFacesFilterImpl.java:336)
     at oracle.adfinternal.view.faces.webapp.AdfFacesFilterImpl.doFilter(AdfFacesFilterImpl.java:196)
     at oracle.adf.view.faces.webapp.AdfFacesFilter.doFilter(AdfFacesFilter.java:105)
     at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:621)
     at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:368)
     at com.evermind.server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:866)
     at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:448)
     at com.evermind.server.http.HttpRequestHandler.serveOneRequest(HttpRequestHandler.java:216)
     at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:117)
     at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:110)
     at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run(ServerSocketReadHandler.java:260)
     at oracle.oc4j.network.ServerSocketAcceptHandler.procClientSocket(ServerSocketAcceptHandler.java:239)
     at oracle.oc4j.network.ServerSocketAcceptHandler.access$700(ServerSocketAcceptHandler.java:34)
     at oracle.oc4j.network.ServerSocketAcceptHandler$AcceptHandlerHorse.run(ServerSocketAcceptHandler.java:880)
     at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303)
     at java.lang.Thread.run(Thread.java:595)
Caused by: javax.faces.el.EvaluationException: javax.persistence.RollbackException: java.lang.NullPointerException
     at com.sun.faces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:150)
     at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:92)
     ... 25 more
Caused by: javax.persistence.RollbackException: java.lang.NullPointerException
     at oracle.toplink.essentials.internal.ejb.cmp3.transaction.base.EntityTransactionImpl.commit(EntityTransactionImpl.java:109)
     at oracle.toplink.essentials.internal.ejb.cmp3.transaction.EntityTransactionImpl.commit(EntityTransactionImpl.java:45)
     at services.inventario.impl.InventarioServiceBean.delLinea(InventarioServiceBean.java:473)
     at ui.ProveedorBean.linea_Del(ProveedorBean.java:152)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at com.sun.faces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:146)
     ... 26 more
Caused by: java.lang.NullPointerException
     at oracle.toplink.essentials.internal.identitymaps.CacheKey.computeHash(CacheKey.java:183)
     at oracle.toplink.essentials.internal.identitymaps.CacheKey.setKey(CacheKey.java:366)
     at oracle.toplink.essentials.internal.identitymaps.IdentityMap.getCacheKey(IdentityMap.java:277)
     at oracle.toplink.essentials.internal.identitymaps.IdentityMap.remove(IdentityMap.java:399)
     at oracle.toplink.essentials.internal.identitymaps.IdentityMapManager.removeFromIdentityMap(IdentityMapManager.java:1036)
     at oracle.toplink.essentials.internal.sessions.IdentityMapAccessor.removeFromIdentityMap(IdentityMapAccessor.java:801)
     at oracle.toplink.essentials.internal.sessions.IdentityMapAccessor.removeFromIdentityMap(IdentityMapAccessor.java:793)
     at oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl.postMergeChanges(UnitOfWorkImpl.java:2834)
     at oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl.mergeChangesIntoParent(UnitOfWorkImpl.java:2556)
     at oracle.toplink.essentials.internal.ejb.cmp3.base.RepeatableWriteUnitOfWork.commitRootUnitOfWork(RepeatableWriteUnitOfWork.java:93)
     at oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl.commitAndResume(UnitOfWorkImpl.java:842)
     at oracle.toplink.essentials.internal.ejb.cmp3.transaction.base.EntityTransactionImpl.commit(EntityTransactionImpl.java:90)
     ... 34 more
The following variation throws the same exception:
public void delLinea( String codprov,String codline){
EntityManager em = jpaResourceBean.getEntityManager();
try{
em.getTransaction().begin();
Proveedor prov = em.find(Proveedor.class, codprov);
Linea linea = em.find(Linea.class, new LineaPK(codprov, codline));
prov.removeLinea(linea);
em.remove(linea);
em.getTransaction().commit();
finally {
em.close();
the following variation:
public void delLinea( String codprov,String codline){
EntityManager em = jpaResourceBean.getEntityManager();
try{
em.getTransaction().begin();
Proveedor prov = em.find(Proveedor.class, codprov);
Linea linea = em.find(Linea.class, new LineaPK(codprov, codline));
prov.removeLinea(linea);
em.getTransaction().commit();
em.getTransaction().begin();
linea = em.find(Linea.class, new LineaPK(codprov, codline));
em.remove(linea);
em.getTransaction().commit();
finally {
em.close();
after the second commit(); throws the same:
Caused by: javax.persistence.RollbackException: java.lang.NullPointerException
     at oracle.toplink.essentials.internal.ejb.cmp3.transaction.base.EntityTransactionImpl.commit(EntityTransactionImpl.java:109)
     at oracle.toplink.essentials.internal.ejb.cmp3.transaction.EntityTransactionImpl.commit(EntityTransactionImpl.java:45)
     at services.inventario.impl.InventarioServiceBean.delLinea(InventarioServiceBean.java:477)
     at ui.ProveedorBean.linea_Del(ProveedorBean.java:152)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:585)
     at com.sun.faces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:146)
     ... 23 more
Caused by: java.lang.NullPointerException
     at oracle.toplink.essentials.internal.identitymaps.CacheKey.computeHash(CacheKey.java:183)
     at oracle.toplink.essentials.internal.identitymaps.CacheKey.setKey(CacheKey.java:366)
     at oracle.toplink.essentials.internal.identitymaps.IdentityMap.getCacheKey(IdentityMap.java:277)
     at oracle.toplink.essentials.internal.identitymaps.IdentityMap.remove(IdentityMap.java:399)
     at oracle.toplink.essentials.internal.identitymaps.IdentityMapManager.removeFromIdentityMap(IdentityMapManager.java:1036)
     at oracle.toplink.essentials.internal.sessions.IdentityMapAccessor.removeFromIdentityMap(IdentityMapAccessor.java:801)
     at oracle.toplink.essentials.internal.sessions.IdentityMapAccessor.removeFromIdentityMap(IdentityMapAccessor.java:793)
     at oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl.postMergeChanges(UnitOfWorkImpl.java:2834)
     at oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl.mergeChangesIntoParent(UnitOfWorkImpl.java:2556)
     at oracle.toplink.essentials.internal.ejb.cmp3.base.RepeatableWriteUnitOfWork.commitRootUnitOfWork(RepeatableWriteUnitOfWork.java:93)
     at oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl.commitAndResume(UnitOfWorkImpl.java:842)
     at oracle.toplink.essentials.internal.ejb.cmp3.transaction.base.EntityTransactionImpl.commit(EntityTransactionImpl.java:90)
     ... 31 more