Session s = HibernateSession.currentSession(); // open a new session
Criteria c =s.createCriteria(User.class);
c.add(Restrictions.eq("id",id.trim())); // set uuid.hex for id
List<User> l = c.list();
User u = l.get(0);
u.setId("");
u.setUsername("public china");
s.saveOrUpdate(u); // for adding a new record
s.beginTransaction().commit();

show error as following:

Hibernate: select this_.id as id0_, this_.username as username1_0_, this_.password as password1_0_, this_.nickName as nickName1_0_, this_.website as website1_0_, this_.type as type1_0_, this_.address as address1_0_, this_.home_telephone as home8_1_0_, this_.mobile_telephone as mobile9_1_0_, this_.realName as realName1_0_ from user this_ where this_.id=?
org.hibernate.HibernateException: identifier of an instance of com.nbnh.enterprise.po.User altered from 4028809303f909db0103f909e0760001 to
at org.hibernate.event.def.DefaultFlushEntityEventListener.checkId(DefaultFlushEntityEventListener.java:51)
at org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:82)
at org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:190)
at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:70)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:26)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:675)
at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:293)
at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:86)
at com.nbnh.enterprise.dao.UserDAOImpl.findUserById(UserDAOImpl.java:40)
at test.dao.TestDAO.userDAO(TestDAO.java:22)
at test.dao.TestDAO.testAllDAO(TestDAO.java:46)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at junit.framework.TestCase.runTest(TestCase.java:154)
at junit.framework.TestCase.runBare(TestCase.java:127)
at junit.framework.TestResult$1.protect(TestResult.java:106)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.framework.TestResult.run(TestResult.java:109)
at junit.framework.TestCase.run(TestCase.java:118)
at junit.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:474)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:342)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:194)
[/list]

I don't understand why you are trying to change an object's ID.
If you want a new object, create a new one and have hibernate save it and set its ID.

Hibernate is warning you that you are changing the id of a non transient object. This makes no sense and Hibernates does not allow you to do that.

my mean is Change one of fields value.
first, i found a object with id, and change it status.

User u = dao.findUserById("329a9d9329329329a");
u.setStatus("locked");
dao.saveOrUpdate(u);// save statusfor user;

above is error. i don't know why run error.
when i add session.close() after dao.findUserByid() method, i run well.

[quote="mrfeng"]my mean is Change one of fields value.
found a user,showing on page.Update one of the fields.
[quote]

Well,

You can change objects attribute, but do not touch the ID and it will work fine.

As per your example: Instead of doing this:


Do this:


I have removed the line where you were touching the ID, I have changed the way to execute your Criteria and the way you use your transaction. Please read carefully :)


Have a nice day,
Vincent.

Thanks for vgiguere. Your answer is right.

This is a mind boggling error that I got too. And it had nothing to do with my code.

I was using save() to persist the object to the database but later on when the JSP got rendered, Webwork's tags tried to set the id of the object causing this error.

I found it by printing a stacktrace in the setId() method:


java.lang.Throwable
at com.zz.zz.vo.User.setId(User.java:47)
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:585)
at ognl.OgnlRuntime.invokeMethod(OgnlRuntime.java:491)
at ognl.OgnlRuntime.callAppropriateMethod(OgnlRuntime.java:785)
at ognl.OgnlRuntime.setMethodValue(OgnlRuntime.java:937)
at ognl.ObjectPropertyAccessor.setPossibleProperty(ObjectPropertyAccessor.java:76)
at ognl.ObjectPropertyAccessor.setProperty(ObjectPropertyAccessor.java:132)
at com.opensymphony.xwork.util.OgnlValueStack$ObjectAccessor.setProperty(OgnlValueStack.java:63)
at ognl.OgnlRuntime.setProperty(OgnlRuntime.java:1629)
at ognl.ASTProperty.setValueBody(ASTProperty.java:105)
at ognl.SimpleNode.evaluateSetValueBody(SimpleNode.java:177)
at ognl.SimpleNode.setValue(SimpleNode.java:246)
at ognl.ASTChain.setValueBody(ASTChain.java:172)
at ognl.SimpleNode.evaluateSetValueBody(SimpleNode.java:177)
at ognl.SimpleNode.setValue(SimpleNode.java:246)
at ognl.Ognl.setValue(Ognl.java:476)
at com.opensymphony.xwork.util.OgnlUtil.setValue(OgnlUtil.java:184)
at com.opensymphony.xwork.util.OgnlValueStack.setValue(OgnlValueStack.java:153)
at com.opensymphony.xwork.util.OgnlValueStack.setValue(OgnlValueStack.java:136)
at com.opensymphony.xwork.interceptor.ParametersInterceptor.setParameters(ParametersInterceptor.java:136)
at com.opensymphony.xwork.interceptor.ParametersInterceptor.before(ParametersInterceptor.java:111)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:30)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
at com.opensymphony.webwork.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:171)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
at com.opensymphony.xwork.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:151)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:189)
at com.opensymphony.xwork.interceptor.AroundInterceptor.intercept(AroundInterceptor.java:31)