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norouzi
 Post subject: Class list is not found in hql query "select new list(*)"
PostPosted: Sun Apr 18, 2010 9:46 am 
Newbie

Joined: Sun Apr 18, 2010 9:08 am
Posts: 1
Hi everyone,

I am using spring-2.0.7 and hibernate-core-3.3.2.GA in a J2EE web application. I would like to create hql queries such as "select new list(t.id, t.name) from Type t".

When such a query is created, a ClassNotFoundException is thrown, seems because the "list" class cannot be found. The exception is thrown from within method classForName of org.hibernate.util.RefletHelper when it is called with the argument name="list".

Code:
   public static Class classForName(String name) throws ClassNotFoundException {
      try {
         ClassLoader contextClassLoader = Thread.currentThread().getContextClassLoader();
         if ( contextClassLoader != null ) {
            return contextClassLoader.loadClass(name);
         }
      }
      catch ( Throwable ignore ) {
      }
      return Class.forName( name );
   }


Here is the stacktrace too:
Code:
java.lang.NullPointerException
   at java.lang.Class.forName0(Native Method)
   at java.lang.Class.forName(Class.java:169)
   at org.hibernate.util.ReflectHelper.classForName(ReflectHelper.java:192)
   at org.hibernate.hql.classic.SelectParser.token(SelectParser.java:96)
   at org.hibernate.hql.classic.ClauseParser.token(ClauseParser.java:109)
   at org.hibernate.hql.classic.ClauseParser.end(ClauseParser.java:136)
   at org.hibernate.hql.classic.PreprocessingParser.end(PreprocessingParser.java:145)
   at org.hibernate.hql.classic.ParserHelper.parse(ParserHelper.java:52)
   at org.hibernate.hql.classic.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:239)
   at org.hibernate.hql.classic.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:208)
   at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:101)
   at org.hibernate.engine.query.HQLQueryPlan.<init>(HQLQueryPlan.java:80)
   at org.hibernate.engine.query.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:94)
   at org.hibernate.impl.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:156)
   at org.hibernate.impl.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:135)
   at org.hibernate.impl.SessionImpl.createQuery(SessionImpl.java:1651)
   at common.base.spring.dao.CentralDaoImpl.find(CentralDaoImpl.java:630)
   at common.base.spring.dao.CentralDaoImpl.find(CentralDaoImpl.java:527)
   at sun.reflect.GeneratedMethodAccessor200.invoke(Unknown Source)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:597)
   at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:304)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
   at org.springframework.orm.hibernate3.HibernateInterceptor.invoke(HibernateInterceptor.java:104)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
   at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
   at $Proxy1.find(Unknown Source)
   at common.hibernate.DBManager.find(DBManager.java:27)
   at erp.etm.tsm.basicInfo.service.impl.TaskTypeStateStepServiceImpl.getQueryByParameters(TaskTypeStateStepServiceImpl.java:39)
   at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
   at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
   at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
   at java.lang.reflect.Method.invoke(Method.java:597)
   at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:304)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
   at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
   at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
   at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
   at $Proxy464.getQueryByParameters(Unknown Source)
   at common.base.struts.action.ActionPattern3.patternPostprocess(ActionPattern3.java:93)
   at common.base.struts.action.ActionPattern.postprocess(ActionPattern.java:121)
   at common.base.struts.action.BaseAction.execute(BaseAction.java:114)
   at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
   at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
   at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
   at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:705)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:818)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
   at common.filter.GlobalVariable.doFilter(GlobalVariable.java:309)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
   at common.filter.CharsetFilter.doFilter(CharsetFilter.java:27)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
   at common.hibernate.HibenateFilter.doFilterInternal(HibenateFilter.java:80)
   at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:75)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
   at common.filter.UsernameFileter.doFilter(UsernameFileter.java:34)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
   at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
   at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
   at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:432)
   at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
   at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
   at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
   at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
   at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
   at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
   at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
   at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
   at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
   at java.lang.Thread.run(Thread.java:619)


Thanks for you time in advance,
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