hibernate错误：at org.hibernate.cache.impl.bridge.RegionFactoryCacheProviderBridge.nextTimestamp

java.lang.NullPointerException
at org.hibernate.cache.impl.bridge.RegionFactoryCacheProviderBridge.nextTimestamp(RegionFactoryCacheProviderBridge.java:93)
at org.hibernate.impl.SessionFactoryImpl.openSession(SessionFactoryImpl.java:639)
at org.hibernate.impl.SessionFactoryImpl.openSession(SessionFactoryImpl.java:648)
at com.hb.dao.impl.UserDaoImpl.delete(UserDaoImpl.java:41)
at com.hb.service.impl.UserServiceImpl.delete(UserServiceImpl.java:27)
at com.hb.service.impl.UserServiceImpl.deleteById(UserServiceImpl.java:35)
at com.hb.service.impl.TestUserServiceImpl.testDelete(TestUserServiceImpl.java:36)
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.ParentRunner.runLeaf(ParentRunner.java:274)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:48)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:242)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:58)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:240)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:48)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:233)
at org.junit.runners.ParentRunner.run(ParentRunner.java:303)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
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)

将hibernate.cfg.xml文件里面的<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>。给删除就行了
还有可能是自己手动关闭session了,其实session的管理交给spring管理了,所以手动关闭会报以上错误!呵呵,删除类似于Java代码
this.getSessionFactory().close();   这样的代码即可解决问题
也有可能是用到了session，但是不是同一个session，即使在不同的方法里如果用sf.getCurrentSession()方法获取session，也是获取同一个session，所以，当方法调用方法的时候，注意session是哪一个，因为getCurrentSession方法产生的session会自动关闭，可能在不同的方法中产生错误。Sessionn is close!