Passivation issue with Stateful Session Bean

问题

I'm using JBoss 6.1 Final, and get the following error message after my web application is running for a while (note the application doesn't crash), followed by a very long stack trace. I notice that this problem only occurs with stateful session beans that have other stateful session beans injected into them.

16:10:59,769 ERROR [org.jboss.ejb3.cache.simple.SimpleStatefulCache.UutSerialNumberServiceBean] problem passivation thread: javax.ejb.EJBException: Could not passivate; failed to save state

Here is the offending stateful session bean...

package com.ray.TEI.ejb;

import java.io.Serializable;

import javax.ejb.Stateful;
import javax.inject.Inject;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.PersistenceContextType;

import com.ray.TEI.model.TestProcedure;
import com.ray.TEI.model.Uut;
import com.ray.TEI.model.UutSerialNumber;

@Stateful
public class UutSerialNumberServiceBean implements Serializable {
  private static final long serialVersionUID = 1L;
  @PersistenceContext(unitName="jasoni", type=PersistenceContextType.EXTENDED)
  protected EntityManager em;
  @Inject private ExecProcedureServiceBean execProcedureServiceBean;

  public boolean isDuplicateSerialNumber(Uut uut, String serialNumber) {
    return ((Number)em.createNamedQuery("UutSerialNumber.getCountByUutIdAndSerialNumber")
             .setParameter("uut", uut)
             .setParameter("serialNumber", serialNumber)
             .getSingleResult()).intValue() > 0;
  }

  public UutSerialNumber findUutSerialNumberByUutSerialNumberId(Integer uutSerialNumberId) {
    return em.find(UutSerialNumber.class, uutSerialNumberId);
  }

  public UutSerialNumber editSerialNumber(Integer uutSerialNumberId, String serialNumber) {
    UutSerialNumber uutSerialNumber = findUutSerialNumberByUutSerialNumberId(uutSerialNumberId);
    uutSerialNumber.setSerialNumber(serialNumber);
    return uutSerialNumber;
  }

  public UutSerialNumber createSerialNumber(Uut uut, String serialNumber) {
    UutSerialNumber uutSerialNumber = new UutSerialNumber();
    uutSerialNumber.setSerialNumber(serialNumber);
    uutSerialNumber.setUut(uut);
    uut.getSerialNumbers().add(uutSerialNumber);
    em.persist(uutSerialNumber);
    for (TestProcedure testProcedure : uut.getTestProcedures()) {
      execProcedureServiceBean.createExecProcedure(uutSerialNumber, testProcedure);
    }
    return uutSerialNumber;
  }
}

Here is the injected stateful session bean...

package com.ray.TEI.ejb;

import java.io.Serializable;

import javax.ejb.Stateful;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.PersistenceContextType;

import com.ray.TEI.model.ExecProcedure;
import com.ray.TEI.model.TestProcedure;
import com.ray.TEI.model.UutSerialNumber;


@Stateful
public class ExecProcedureServiceBean implements Serializable {
  private static final long serialVersionUID = 1L;
  @PersistenceContext(unitName="jasoni", type=PersistenceContextType.EXTENDED)
  protected EntityManager em;

  public ExecProcedure createExecProcedure(UutSerialNumber uutSerialNumber, TestProcedure testProcedure) {
    ExecProcedure execProcedure = new ExecProcedure();
    execProcedure.setUutSerialNumber(uutSerialNumber);
    execProcedure.setTestProcedure(testProcedure);
    execProcedure.setIterationCount(0);
    em.persist(execProcedure);
    return execProcedure;
  }
}

anyone know what's wrong with this?

Thanks, Jason

回答1:

EntityManager is not serializable, I guess that's why it fails.

Couple of options from here:

• deactivate passivation (easiest option in case you don't need that mechanism)
• remove persistence-context from SFSB (this will most likely kill your EXTENDED mode)
• replace EntityManager with Hibernate-Session, which is serializable (consider that experimental, I've never tried it out myself)

来源：https://stackoverflow.com/questions/10219685/passivation-issue-with-stateful-session-bean