GenericJDBCException: could not insert: [com.sns.bean.User]

##原因：当使用uuid当主键的时候 使用Hibernate 并且将其实体映射 <generator class="native" /> 设为自动增长时会报此异常，因为uuid为字符型的无法使用数字型的自动增长。

解决方法：只需要将<generator class="native" /> 在实体中删除掉 问题即可解决。

org.hibernate.exception.GenericJDBCException: could not insert: [ com.sns.bean.User]--实体类

at org.hibernate.exception.SQLStateConverter.handledNonSpecificException(SQLStateConverter.java:103)

at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:91)

at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)

at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:40)

at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2153)

at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2633)

at org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:51)

at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:279)

at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:298)

at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:181)

at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:107)

at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:187)

at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:33)

at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:172)

at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:27)

at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)

at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:536)

at org.hibernate.impl.SessionImpl.save(SessionImpl.java:524)

at org.hibernate.impl.SessionImpl.save(SessionImpl.java:520)

at com.sns.dao.DaoImpl.Register( DaoImpl.java:36)

at com.sns.test.MyTest.test_add(MyTest.java:27)

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 junit.framework.TestCase.runTest(TestCase.java:164)

at junit.framework.TestCase.runBare(TestCase.java:130)

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:120)

at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)

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)

Caused by: java.sql.SQLException: Field 'id' doesn't have a default value

at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2921)

at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1570)

at com.mysql.jdbc.ServerPreparedStatement.serverExecute(ServerPreparedStatement.java:1085)

at com.mysql.jdbc.ServerPreparedStatement.executeInternal(ServerPreparedStatement.java:670)

at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1159)

at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1076)

at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1061)

at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:73)

at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:33)

... 33 more