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1. Exception [EclipseLink-4002] don't know whats missing Jpa -jsf project!    stackoverflow.com

Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.0.1.v20100213-r6600): org.eclipse.persistence.exceptions.DatabaseException Internal Exception: java.sql.SQLException: Error in allocating a connection. Cause: null Error Code: 0
at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:397)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.getServerSession(EntityManagerFactoryImpl.java:151)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:207)
at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:202)
at com.sun.enterprise.container.common.impl.EntityManagerWrapper._getDelegate(EntityManagerWrapper.java:207)
at com.sun.enterprise.container.common.impl.EntityManagerWrapper.getCriteriaBuilder(EntityManagerWrapper.java:883)
at entitybeans.jpa.UsuarioFacade.count(UsuarioFacade.java:58

2. How to remove item collection using current context JPA, JSF, Java Collections    stackoverflow.com

I want to remove comment that do not match the current movie; info 

         jpaController = (CommentFacade) facesContext.getApplication().getELResolver().getValue(facesContext.getELContext(), null, "commentJpa");
      ...