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

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Exception in thread "main" java.lang.UnsupportedOperationException: The application must supply JDBC connections
   at org.hibernate.service.jdbc.connections.internal.UserSuppliedConnectionProviderImpl.getConnection(UserSuppliedConnectionProviderImpl.java:62)
   at org.hibernate.internal.AbstractSessionImpl$NonContextualJdbcConnectionAccess.obtainConnection(AbstractSessionImpl.java:292)
   at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.obtainConnection(LogicalConnectionImpl.java:297)
   at org.hibernate.engine.jdbc.internal.LogicalConnectionImpl.getConnection(LogicalConnectionImpl.java:169)
   at org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction.doBegin(JdbcTransaction.java:67)
   at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.begin(AbstractTransactionImpl.java:160)

at org.hibernate.internal.SessionImpl.beginTransaction(SessionImpl.java:1395)

原因之一：Hibernate Configuration 类默认查找加载 Properties文件，如果工程中使用 cfg.xml 配置数据源信息的话，需要在创建完毕Configuration对象后调用一下该对象的configure() 方法来告诉 Hibernate 去找 cfg.xml 。这样问题就得到解决。