Org.hibernate.id.IdentifierGenerationException:ids for this class must is manually assigned before calling Save ()

Org.hibernate.id.IdentifierGenerationException:ids for this class must is manually assigned before calling save () : Com.zh.hibernate.subclass.Person
At Org.hibernate.id.Assigned.generate (assigned.java:52)
At Org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId (Abstractsaveeventlistener.java : 117)
At Org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId ( defaultsaveorupdateeventlistener.java:206)
At Org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId ( DEFAULTSAVEEVENTLISTENER.JAVA:55)
At Org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient ( defaultsaveorupdateeventlistener.java:191)
At Org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate (defaultsaveeventlistener.java:49)
At Org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate ( DEFAULTSAVEORUPDATEEVENTLISTENER.JAVA:90)
At Org.hibernate.internal.SessionImpl.fireSave (sessionimpl.java:764)
At Org.hibernate.internal.SessionImpl.save (sessionimpl.java:756)
At Org.hibernate.internal.SessionImpl.save (sessionimpl.java:752)
At Com.zh.hibernate.subclass.SubclassTest.testSave (subclasstest.java:26)
At Sun.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
At Sun.reflect.NativeMethodAccessorImpl.invoke (nativemethodaccessorimpl.java:57)
At Sun.reflect.DelegatingMethodAccessorImpl.invoke (delegatingmethodaccessorimpl.java:43)
At Java.lang.reflect.Method.invoke (method.java:606)
At Org.junit.runners.model.frameworkmethod$1.runreflectivecall (frameworkmethod.java:47)
At Org.junit.internal.runners.model.ReflectiveCallable.run (reflectivecallable.java:12)
At org.junit.runners.model.FrameworkMethod.invokeExplosively (frameworkmethod.java:44)
At Org.junit.internal.runners.statements.InvokeMethod.evaluate (invokemethod.java:17)
At Org.junit.runners.ParentRunner.runLeaf (parentrunner.java:271)
At Org.junit.runners.BlockJUnit4ClassRunner.runChild (blockjunit4classrunner.java:70)
At Org.junit.runners.BlockJUnit4ClassRunner.runChild (blockjunit4classrunner.java:50)
At Org.junit.runners.parentrunner$3.run (parentrunner.java:238)
At Org.junit.runners.parentrunner$1.schedule (parentrunner.java:63)
At Org.junit.runners.ParentRunner.runChildren (parentrunner.java:236)
At org.junit.runners.parentrunner.access$000 (parentrunner.java:53)
At Org.junit.runners.parentrunner$2.evaluate (parentrunner.java:229)
At Org.junit.runners.ParentRunner.run (parentrunner.java:309)
At Org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run (junit4testreference.java:50)
At Org.eclipse.jdt.internal.junit.runner.TestExecution.run (testexecution.java:38)
At Org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests (remotetestrunner.java:459)
At Org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests (remotetestrunner.java:675)
At Org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run (remotetestrunner.java:382)
At Org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main (remotetestrunner.java:192)

Cause of error: In the mapping file, the ID is set to the category assigned, which does not conform to the settings of my database MySQL itself.

Change the error:

Now that I have changed its properties to native, I can see that there are no other causes of such errors at this time. After the encounter will be updated in time

Org.hibernate.id.IdentifierGenerationException:ids for this class must is manually assigned before calling Save ()