错误:org.hibernate.PropertyValueException:not-null property references a null or transient value

org.hibernate.PropertyValueException: not-null property references a null or transient value: com.zyl.po.Card.cardnum 
at org.hibernate.engine.Nullability.checkNullability(Nullability.java:95) 
at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:313)
at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:204) 
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:144)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.performSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:117)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93)
at org.hibernate.impl.SessionImpl.fireSaveOrUpdate(SessionImpl.java:535) 
at org.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:527) 
at org.hibernate.engine.CascadingAction$5.cascade(CascadingAction.java:241) 
at org.hibernate.engine.Cascade.cascadeToOne(Cascade.java:292) 
at org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:240) 
at org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:193) 
at org.hibernate.engine.Cascade.cascade(Cascade.java:154) 
at org.hibernate.event.def.AbstractSaveEventListener.cascadeAfterSave(AbstractSaveEventListener.java:479)
at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:357)
at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:204) 
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:144)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210)
at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:56)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195)
at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:50) 
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93)
at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:563) 
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:551) 
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:547) 
at com.zyl.dao.UserDAO.save(UserDAO.java:16) 
at com.zyl.dao.test.UserDAOTestCase.testSaveUsers(UserDAOTestCase.java:23) 
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.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28) 
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31) 
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:73) 
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:46) 
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:180) 
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:41) 
at org.junit.runners.ParentRunner$1.evaluate(ParentRunner.java:173) 
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28) 
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31) 
at org.junit.runners.ParentRunner.run(ParentRunner.java:220) 
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) 



提示很明显,非空的值关联了一个空值或无效的值,就是你数据库里面某个字段设置为非空了,

在.hbm.xml文件里某个属性的not-null="true"该为false

<property name="sname" type="java.lang.String">
<column name="sname" not-null="false" />
</property>