我是Java和Hibernate的新手(是Rails和C#开发人员)。无论如何,我有一个可以在Hibernate上正常运行的测试程序,但是我的实际Web应用程序(Struts 1)崩溃了:
SEVERE: Servlet.service() for servlet default threw exception java.lang.NoSuchFieldError: INSTANCE
我在用:
Hibernate 3.6.1 with Annotations
Struts 1 with Apache Tiles
C3P0 connection pool
下面是实际的程序 WORKS 。这是主体项目的一部分。只是一个简单的JAVA测试。
public class TestUser { public static void main(String[] args) { SessionFactory factory = HibernateUtil.getSessionFactory(); Session session = factory.getCurrentSession(); session.beginTransaction(); String queryString = "from User where UserName = 'Quake'"; Query query = session.createQuery(queryString); User quake = (User)query.uniqueResult(); session.getTransaction().commit(); System.out.println( quake.getEmail() ); System.out.println( "Active? " + quake.isActive() ); UserRepository userRepo = new UserRepository(); System.out.println( "User Quake: " + userRepo.findAll().get(0).getEmail() ); } }
效果很好。输出一些样本数据。
现在,当我尝试在Struts中执行相同的操作时,出现了异常。这是 行不通的 :
public class ListUsers extends org.apache.struts.action.Action { /* forward name="success" path="" */ private static final String SUCCESS = "success"; /** * This is the action called from the Struts framework. * @param mapping The ActionMapping used to select this instance. * @param form The optional ActionForm bean for this request. * @param request The HTTP Request we are processing. * @param response The HTTP Response we are processing. * @throws java.lang.Exception * @return */ @Override public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response) throws Exception { List<String> listMsg = new ArrayList<String>(); listMsg.add("Message A"); listMsg.add("Message B"); listMsg.add("Message C"); listMsg.add("Message D"); request.setAttribute("listMsg", listMsg); UserRepository userRepo = new UserRepository(); // CRASHES HERE (see HibernateUtil) String email = userRepo.first().getEmail(); return mapping.findForward(SUCCESS); } }
这是我的HibernateUtil类:
public class HibernateUtil { private static final SessionFactory sessionFactory = buildSessionFactory(); private static SessionFactory buildSessionFactory() { try { // Create the SessionFactory from hibernate.cfg.xml Configuration config = new Configuration(); // THIS LINE CRASHES IN STRUTS // Add annotated classes config.addAnnotatedClass(User.class); config.configure(); return config.buildSessionFactory(); } catch (Throwable ex) { // Make sure you log the exception, as it might be swallowed System.err.println("Initial SessionFactory creation failed. WTFQNIL: " + ex); throw new ExceptionInInitializerError(ex); } } public static SessionFactory getSessionFactory() { return sessionFactory; } }
中的Configuration config = new Configuration()行HibernateUtil是在Struts中崩溃的行,而不是在测试应用程序中崩溃的行。
Configuration config = new Configuration()
HibernateUtil
这是完整的异常转储:
Feb 24, 2011 9:51:58 AM org.apache.catalina.core.StandardWrapperValve invoke SEVERE: Servlet.service() for servlet default threw exception java.lang.NoSuchFieldError: INSTANCE at org.hibernate.type.BasicTypeRegistry.<init>(BasicTypeRegistry.java:94) at org.hibernate.type.TypeResolver.<init>(TypeResolver.java:59) at org.hibernate.cfg.Configuration.<init>(Configuration.java:249) at org.hibernate.cfg.Configuration.<init>(Configuration.java:300) at com.kencogroup.kkms.struts.utilities.HibernateUtil.buildSessionFactory(HibernateUtil.java:22) at com.kencogroup.kkms.struts.utilities.HibernateUtil.<clinit>(HibernateUtil.java:17) at com.kencogroup.dao.repositories.UserRepository.first(UserRepository.java:33) at com.kencogroup.kkms.struts.actions.ListUsers.execute(ListUsers.java:52) at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:425) at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:228) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913) at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449) 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.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:176) at org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:145) at org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:92) at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:381) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:646) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302) at org.tuckey.web.filters.urlrewrite.NormalRewrittenUrl.doRewrite(NormalRewrittenUrl.java:213) at org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:171) at org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:145) at org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:92) at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:381) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) 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:298) at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:859) at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579) at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1555) at java.lang.Thread.run(Thread.java:662)
我究竟做错了什么?
谢谢!
看起来您在类路径中有多个版本的Hibernate jar。