java.lang.UnsupportedOperationException: The application must supply JDBC connections

I wrote some code to test my configuration of Hibernate. But I come across an error message: ``` java.lang.UnsupportedOperationException: The application must supply JDBC connections at org.hibernate.engine.jdbc.connections.internal.UserSuppliedConnectionProviderImpl.getConnection(UserSuppliedConnectionProviderImpl.java:61) at org.hibernate.internal.AbstractSessionImpl$NonContextualJdbcConnectionAccess.obtainConnection(AbstractSessionImpl.java:380) at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:228) at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.getConnection(LogicalConnectionImpl.java:171) at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.doBegin(JdbcTransaction.java:67) at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.begin(AbstractTransactionImpl.java:162) at org.hibernate.internal.SessionImpl.beginTransaction(SessionImpl.java:1435) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.hibernate.context.internal.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:356) at com.sun.proxy.$Proxy0.beginTransaction(Unknown Source) ``` My file structure is like below: ``` src ---test -------Test.java(with main function) -------User.java -------User.hbm.xml ----hibernate.cfg.xml ``` This is not a web application, it's just an ordinary java project. The hibernate.cfg.xml is like below: ``` <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> <hibernate-configuration> <session-factory> <!-- Configure MySQL --> <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> <property name="hibernate.connection.URL">jdbc:mysql://localhost:3306/mags</property> <property name="hibernate.connection.username">root</property> <property name="hibernate.connection.password">bysjysf</property> <property name="show_sql">true</property> <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property> <property name="hibernate.current_session_context_class">thread</property> <!-- Mapping Files --> <mapping resource="test/User.hbm.xml" /> </session-factory> </hibernate-configuration> ``` The code in main function is like below: ``` public static void main(String[] args) { Configuration cfg = new Configuration().configure("hibernate.cfg.xml"); StandardServiceRegistryBuilder sb = new StandardServiceRegistryBuilder(); sb.applySettings(cfg.getProperties()); StandardServiceRegistry standardServiceRegistry = sb.build(); SessionFactory sessionFactory = cfg.buildSessionFactory(standardServiceRegistry); Session session = sessionFactory.getCurrentSession(); System.out.println(session); Transaction tx = session.beginTransaction(); User user = new User(); user.setPassword("aaaa"); user.setUsername("ysf"); user.setAuthority(1); session.save(user); tx.commit(); session.close(); } ``` According the error message, the error occurred in `Transaction tx = session.beginTransaction();` I am a new user for Hibernate, and I have checked my configuration file many times. Could anyone help to figure out what the problem is? Thanks! The Hibernate version is 4.3.5