[JSP]: Tomcat ed errore "Unable to compile class"

[alv21]

ho installato Apache Tomcat 5.5.17 Server e la jdk1.5.0_07 (su windows )
il web server va su senza problemi ma quando lancio la mia applicazione mi dà questo errore:

- (ApplicationDispatcher.java:invoke:704)org.apache. jasper.JasperException: Unable to compile class for JSP

Generated servlet error:
The return type is incompatible with JspSourceDependent.getDependants()


at org.apache.jasper.compiler.DefaultErrorHandler.jav acError(DefaultErrorHandler.java:84)
at org.apache.jasper.compiler.ErrorDispatcher.javacEr ror(ErrorDispatcher.java:328)
at org.apache.jasper.compiler.JDTCompiler.generateCla ss(JDTCompiler.java:414)
at org.apache.jasper.compiler.Compiler.compile(Compil er.java:297)
at org.apache.jasper.compiler.Compiler.compile(Compil er.java:276)
at org.apache.jasper.compiler.Compiler.compile(Compil er.java:264)
at org.apache.jasper.JspCompilationContext.compile(Js pCompilationContext.java:563)
at org.apache.jasper.servlet.JspServletWrapper.servic e(JspServletWrapper.java:303)
at org.apache.jasper.servlet.JspServlet.serviceJspFil e(JspServlet.java:314)
at org.apache.jasper.servlet.JspServlet.service(JspSe rvlet.java:264)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:802)
at org.apache.catalina.core.ApplicationFilterChain.in ternalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.do Filter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.ApplicationDispatcher.inv oke(ApplicationDispatcher.java:672)
at org.apache.catalina.core.ApplicationDispatcher.pro cessRequest(ApplicationDispatcher.java:463)
at org.apache.catalina.core.ApplicationDispatcher.doF orward(ApplicationDispatcher.java:398)
at org.apache.catalina.core.ApplicationDispatcher.for ward(ApplicationDispatcher.java:301)
at org.apache.struts.action.RequestProcessor.doForwar d(RequestProcessor.java:1056)
at org.apache.struts.tiles.TilesRequestProcessor.doFo rward(TilesRequestProcessor.java:261)
at org.apache.struts.action.RequestProcessor.processF orwardConfig(RequestProcessor.java:388)
at org.apache.struts.tiles.TilesRequestProcessor.proc essForwardConfig(TilesRequestProcessor.java:316)
at org.apache.struts.action.RequestProcessor.process( RequestProcessor.java:231)
at org.apache.struts.action.ActionServlet.process(Act ionServlet.java:1164)
at org.apache.struts.action.ActionServlet.doGet(Actio nServlet.java:397)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:689)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:802)
at org.apache.catalina.core.ApplicationFilterChain.in ternalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.do Filter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invo ke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invo ke(StandardContextValve.java:178)
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.invok e(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.servic e(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(H ttp11Processor.java:869)
at org.apache.coyote.http11.Http11BaseProtocol$Http11 ConnectionHandler.processConnection(Http11BaseProt ocol.java:664)
at org.apache.tomcat.util.net.PoolTcpEndpoint.process Socket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThr ead.runIt(LeaderFollowerWorkerThread.java:80)
at org.apache.tomcat.util.threads.ThreadPool$ControlR unnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Unknown Source)
[ERROR] 16-08-2006@16:37:01 org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/Storepicking].[action] - Servlet.service() for servlet action threw exception
- (StandardWrapperValve.java:invoke:253)org.apache.j asper.JasperException: Unable to compile class for JSP

Generated servlet error:
The return type is incompatible with JspSourceDependent.getDependants()


at org.apache.jasper.compiler.DefaultErrorHandler.jav acError(DefaultErrorHandler.java:84)
at org.apache.jasper.compiler.ErrorDispatcher.javacEr ror(ErrorDispatcher.java:328)
at org.apache.jasper.compiler.JDTCompiler.generateCla ss(JDTCompiler.java:414)
at org.apache.jasper.compiler.Compiler.compile(Compil er.java:297)
at org.apache.jasper.compiler.Compiler.compile(Compil er.java:276)
at org.apache.jasper.compiler.Compiler.compile(Compil er.java:264)
at org.apache.jasper.JspCompilationContext.compile(Js pCompilationContext.java:563)
at org.apache.jasper.servlet.JspServletWrapper.servic e(JspServletWrapper.java:303)
at org.apache.jasper.servlet.JspServlet.serviceJspFil e(JspServlet.java:314)
at org.apache.jasper.servlet.JspServlet.service(JspSe rvlet.java:264)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:802)
at org.apache.catalina.core.ApplicationFilterChain.in ternalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.do Filter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.ApplicationDispatcher.inv oke(ApplicationDispatcher.java:672)
at org.apache.catalina.core.ApplicationDispatcher.pro cessRequest(ApplicationDispatcher.java:463)
at org.apache.catalina.core.ApplicationDispatcher.doF orward(ApplicationDispatcher.java:398)
at org.apache.catalina.core.ApplicationDispatcher.for ward(ApplicationDispatcher.java:301)
at org.apache.struts.action.RequestProcessor.doForwar d(RequestProcessor.java:1056)
at org.apache.struts.tiles.TilesRequestProcessor.doFo rward(TilesRequestProcessor.java:261)
at org.apache.struts.action.RequestProcessor.processF orwardConfig(RequestProcessor.java:388)
at org.apache.struts.tiles.TilesRequestProcessor.proc essForwardConfig(TilesRequestProcessor.java:316)
at org.apache.struts.action.RequestProcessor.process( RequestProcessor.java:231)
at org.apache.struts.action.ActionServlet.process(Act ionServlet.java:1164)
at org.apache.struts.action.ActionServlet.doGet(Actio nServlet.java:397)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:689)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:802)
at org.apache.catalina.core.ApplicationFilterChain.in ternalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.do Filter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invo ke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invo ke(StandardContextValve.java:178)
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.invok e(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.servic e(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(H ttp11Processor.java:869)
at org.apache.coyote.http11.Http11BaseProtocol$Http11 ConnectionHandler.processConnection(Http11BaseProt ocol.java:664)
at org.apache.tomcat.util.net.PoolTcpEndpoint.process Socket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThr ead.runIt(LeaderFollowerWorkerThread.java:80)
at org.apache.tomcat.util.threads.ThreadPool$ControlR unnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Unknown Source)

sono nubbio con queste tecnologie.
non capisco se è un problema della mia applicazione oppure ho dimenticato di settare qualcosa nel tomcat. fino a ieri tomcat andava poi stamattina non ne voleva sapere di andare su e si piantava a metà caricaggio, l'ho reinstallato e adesso ho il problema di cui sopra. se il problema è nell'applicazione, come capisco dove, visto che non mi segnala nessun file in particolare (come finora invece aveva sempra fatto..)?
grazie per il supporto.

ps: ho cercato in giro sul forum se c'era già qualcosa al riguardo che mi aiutasse ma non l'ho trovato.

[alv21]

ho installato la versione di tomcat 5.5.0 (anzichè 17) e funziona!