Hibernate查询list()时报java.util.ConcurrentModificationException

[ijse]

下面是我的代码：

	@SuppressWarnings("unchecked")
	public List<?> get(String hql, Object[] args) {
		Session s = sf.getCurrentSession();
		List<T> rslt = null;
		Transaction ts = s.beginTransaction();
		try {
			Query q = s.createQuery(hql);
			for (int i = 0; i < (args == null ? 0 : args.length); ++i) {
				q.setParameter(i, args[i]);
			}
			s.flush();
			rslt = (List<T>)(q.list());
//			ts.commit();
		} catch (HibernateException e) {
			ts.rollback();
			log.error("从数据库中获取所有数据时出错！", e);
			e.printStackTrace();
		}
		// if(rslt == null)
		// throw new RecordNotFoundException();
		return rslt;
	}

以下是详细出错信息：

java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
	at java.util.HashMap$ValueIterator.next(HashMap.java:822)
	at org.hibernate.pretty.Printer.toString(Printer.java:113)
	at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:120)
	at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50)
	at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1206)
	at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:375)
	at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:137)
	at cn.ijser.DAO.Impl.BaseDAO.get(BaseDAO.java:136)
	at cn.ijser.Services.UserGroupService.getByName(UserGroupService.java:91)
	at cn.ijser.InitDataTest.insertUser(InitDataTest.java:123)
	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:597)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

诡异的是：有时候我DEBUG一步一步，就不会出错，而直接运行基本总会出这个错。。在网上也查了半天，无果。

怎么办呢？

[ijse]

就是q.list()的时候出错，就在这里。再深入就进Hibernate的源码了，我实在没办法了。求救哎

[ijse]

	public List<T> get(String hql, Object[] args) {
		List<T> rslt = new ArrayList<T>();
		Session s = sf.getCurrentSession();
		Transaction ts = s.beginTransaction();
		try {
			Query q = s.createQuery(hql);
			for (int i = 0; i < (args == null ? 0 : args.length); ++i) {
				q.setParameter(i, args[i]);
			}
			for(Iterator<T> it = q.iterate(); it.hasNext();) {
				rslt.add(it.next());
			}
//			rslt = (List<T>)(q.list());
//			ts.commit();
		} catch (HibernateException e) {
			ts.rollback();
			log.error("从数据库中获取所有数据时出错！", e);
			e.printStackTrace();
		}
		// if(rslt == null)
		// throw new RecordNotFoundException();
		return rslt;
	}

采用这种方式便可以，谁能给解释下呢？

[wang_darui]

不错的资料！

[ijse]

求解释，求怎样用延迟加载 。。