在JPA操作期间获取java.lang.IllegalMonitorStateException异常

Question

我在我的应用程序中使用JPA框架。特别是在我点击任何调用JPA操作的链接时，我经常收到IllegalMonitorStateException异常。

错误日志是：

java.lang.IllegalMonitorStateException
at java.util.Vector.isEmpty(Vector.java:500)
at org.eclipse.persistence.internal.jpa.querydef.FromImpl.findJoins(FromImpl.java:567)
at org.eclipse.persistence.internal.jpa.querydef.AbstractQueryImpl.findJoins(AbstractQueryImpl.java:318)
at org.eclipse.persistence.internal.jpa.querydef.CriteriaQueryImpl.translate(CriteriaQueryImpl.java:710)
at org.eclipse.persistence.internal.jpa.EntityManagerImpl.createQuery(EntityManagerImpl.java:1412)
at com.abco.revenuecycle.persistence.ResultListProcess.getTypedQuery(ResultListProcess.java:62)

我在catch块中捕获了此Exception并调用了entityManager.close()。当我再次单击该链接时，创建新的workunit对象。示例代码在这里：

处理异常：

catch(IllegalMonitorStateException ime){
    FactoryHolder factoryHolder = factoryMap.get(schema);
    WorkUnit workUnit = factoryHolder.workUnitLocal.get();
    if (null != workUnit) {
        workUnit.close();
        workUnit = null;
    }
    factoryHolder.workUnitLocal.set(null);
}

创建新对象：

synchronized (lock) {
    FactoryHolder factoryHolder = factoryMap.get(schema);
    workUnit = factoryHolder.workUnitLocal.get();
    //check if entity manager is open
    if (null == workUnit || !workUnit.isOpen()) {
        return createWorkUnit(schema);
    }
}

请提供解决方案以避免此Exception。

提前致谢。