这个错貌似在Hibernate3是不会出现的,但我也不确定就是了;
proxool.xml主要代码如下,
<alias>dbpool</alias> <driver-url> jdbc:mysql://localhost:3306/hbmdb </driver-url> <driver-class>com.mysql.jdbc.Driver</driver-class> <driver-properties> <property name="user" value="root" /> <property name="password" value="123456" /> </driver-properties> <property name="hibernate.proxool.existing_pool">true</property>
HibernateUtil.java
public class HibernateUtil { private static final SessionFactory sessionFactory = buildSessionFactory(); private static SessionFactory buildSessionFactory() { try { Configuration configuration = new Configuration().configure(); ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry(); return configuration.buildSessionFactory(serviceRegistry); } catch (Throwable ex) { // Make sure you log the exception, as it might be swallowed System.err.println("Initial SessionFactory creation failed." + ex); throw new ExceptionInInitializerError(ex); } } public static SessionFactory getSessionFactory() { return sessionFactory; } }
Session session = HibernateUtil.getSessionFactory().getCurrentSession(); session.beginTransaction();
在执行session.beginTransaction();时就会报错
2012-10-13 22:24:11 SqlExceptionHelper [WARN] SQL Error: 0, SQLState: 08001 2012-10-13 22:24:11 SqlExceptionHelper [ERROR] The url cannot be null org.hibernate.exception.JDBCConnectionException: Could not open connection 2012-10-13 22:24:11 org.apache.catalina.core.StandardWrapperValve invoke 严重: Servlet.service() for servlet Event Manager threw exception org.hibernate.TransactionException: Transaction not successfully started at org.hibernate.engine.transaction.spi.AbstractTransactionImpl.rollback(AbstractTransactionImpl.java:200) at org.hibernate.tutorial.servlet.EventManagerServlet.doGet(EventManagerServlet.java:68) at javax.servlet.http.HttpServlet.service(HttpServlet.java:617) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) at java.lang.Thread.run(Thread.java:662)