異常的內容如下：

org.hibernate.service.UnknownServiceException: Unknown service requested [org.hibernate.engine.jdbc.connections.spi.ConnectionProvider]
    at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:201)
    at org.hibernate.internal.AbstractSessionImpl.getJdbcConnectionAccess(AbstractSessionImpl.java:341)
    at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.<init>(JdbcCoordinatorImpl.java:114)
    at org.hibernate.engine.transaction.internal.TransactionCoordinatorImpl.<init>(TransactionCoordinatorImpl.java:89)
    at org.hibernate.internal.SessionImpl.<init>(SessionImpl.java:258)
    at org.hibernate.internal.SessionFactoryImpl$SessionBuilderImpl.openSession(SessionFactoryImpl.java:1589)
    at org.hibernate.context.internal.ThreadLocalSessionContext.buildOrObtainSession(ThreadLocalSessionContext.java:157)
    at org.hibernate.context.internal.ThreadLocalSessionContext.currentSession(ThreadLocalSessionContext.java:109)
    at org.hibernate.internal.SessionFactoryImpl.getCurrentSession(SessionFactoryImpl.java:1014)
    at travel.bean.impl.UserBeanImpl.addUser(UserBeanImpl.java:50)
    at travel.service.impl.UserServiceImpl.UsersReg(UserServiceImpl.java:31)
    at travel.service.TestUsersReg.TestUserReg(TestUsersReg.java:18)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
    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)

查了很久的原因，發現是呼叫的兩個方法，都要開啟 sessionFactory .

我的解決辦法時將前面一個呼叫的方法中的 sessionFactory 最後置為空，sessionFactory = null;

在下一個方法中就能重新呼叫啦,成功解決～

-------------------------------------------------------

以上是昨天的解決方案，今天早上測試時發現不關閉 SessionFactory 會使系統變卡，應該是在每個方法中都重新 new 了個，，

所以，我想到了將 SessionFactory 重用，

public class MyHibernateSessionFactory {

    private final static Configuration configuration = new Configuration().configure();
    private final static ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).build();
    private final static SessionFactory sessionFactory = configuration.buildSessionFactory(serviceRegistry);

    private MyHibernateSessionFactory() {
    }

    public static Session getSession() {
        return sessionFactory.openSession();
    }

    private static class SingletonHolder {
        private final static MyHibernateSessionFactory INSTANCE = new MyHibernateSessionFactory();
    }

    public static MyHibernateSessionFactory getInstance() {
        return SingletonHolder.INSTANCE;
    }

}

在外部重新定義，然後在方法中呼叫

public Users SearchUser() {
        Session session = MyHibernateSessionFactory.getSession();
        Transaction tx = session.beginTransaction();
      

       try{

          //do something

       }catch(Exception ex){

       //do something;

       }finally{

          tx = null;  
          session.close();
        }
    }

搞定，如果後續有問題我再跟新