| Summary: | Taglibrary utilizing generified collections | ||
|---|---|---|---|
| Product: | Tomcat 5 | Reporter: | Michael Snoyman <snoyberg> |
| Component: | Jasper | Assignee: | Tomcat Developers Mailing List <dev> |
| Status: | RESOLVED WONTFIX | ||
| Severity: | minor | Keywords: | JDK1.5 |
| Priority: | P4 | ||
| Version: | 5.0.28 | ||
| Target Milestone: | --- | ||
| Hardware: | PC | ||
| OS: | Linux | ||
Tomcat 5.5 has support for JDK 1.5 features already. As a work-around, you can try removing the JTD jar from common/lib and use the Ant compiler. |
I implemented two tags, one to display a navigation bar and another to display a list of news items. Both tags received their data from a DAO which returned a Collection of appropriate objects. When I switched over to using generics the error below appeared for *both* tags. I found two different fixes. If I avoided creating a local variable to hold either the Collection<NewsItem> or Iterator<NewsItem>, then everything worked fine. For example: for(NewsItem n : newsItemDao.getAll()) { ... } solved the problem. The other approach was simply not to use the generic approach in the tag, even though the DAO was still returning a generified collection. Here's one of the stacktraces, the other was the same: Sep 21, 2005 9:43:57 PM org.apache.jasper.compiler.Compiler generateClass SEVERE: Error compiling file: /var/lib/tomcat-5/default/work/Catalina/localhost/javacms//org/apache/jsp/WEB_002dINF/jsp/news_jsp.java [javac] Compiling 1 source file [javac] /var/lib/tomcat-5/default/work/Catalina/localhost/javacms/org/apache/jsp/WEB_002dINF/jsp/news_jsp.java:95:29:95:35: Semantic Error: The class file "NewsTag.class" in "/var/lib/tomcat-5/default/webapps/javacms/WEB-INF/classes/com/snoyman/jcms/taglib" has an invalid format (duplicate local variable type table). [javac] /var/lib/tomcat-5/default/work/Catalina/localhost/javacms/org/apache/jsp/WEB_002dINF/jsp/news_jsp.java:95:61:95:91: Semantic Error: Type "NewsTag" was not found. [javac] /var/lib/tomcat-5/default/work/Catalina/localhost/javacms/org/apache/jsp/WEB_002dINF/jsp/news_jsp.java:95:129:95:159: Semantic Error: Type "NewsTag" was not found. Sep 21, 2005 9:43:57 PM org.springframework.web.servlet.FrameworkServlet serviceWrapper SEVERE: Could not complete request org.apache.jasper.JasperException: Unable to compile class for JSP An error occurred at line: 8 in the jsp file: /WEB-INF/jsp/news.jsp Generated servlet error: [javac] /var/lib/tomcat-5/default/work/Catalina/localhost/javacms/org/apache/jsp/WEB_002dINF/jsp/news_jsp.java:95:29:95:35: Semantic Error: The class file "NewsTag.class" in "/var/lib/tomcat-5/default/webapps/javacms/WEB-INF/classes/com/snoyman/jcms/taglib" has an invalid format (duplicate local variable type table). An error occurred at line: 8 in the jsp file: /WEB-INF/jsp/news.jsp Generated servlet error: [javac] /var/lib/tomcat-5/default/work/Catalina/localhost/javacms/org/apache/jsp/WEB_002dINF/jsp/news_jsp.java:95:61:95:91: Semantic Error: Type "NewsTag" was not found. An error occurred at line: 8 in the jsp file: /WEB-INF/jsp/news.jsp Generated servlet error: [javac] /var/lib/tomcat-5/default/work/Catalina/localhost/javacms/org/apache/jsp/WEB_002dINF/jsp/news_jsp.java:95:129:95:159: Semantic Error: Type "NewsTag" was not found. at org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:84) at org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:332) at org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:412) at org.apache.jasper.compiler.Compiler.compile(Compiler.java:472) at org.apache.jasper.compiler.Compiler.compile(Compiler.java:451) at org.apache.jasper.compiler.Compiler.compile(Compiler.java:439) at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:511) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:295) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236) at javax.servlet.http.HttpServlet.service(HttpServlet.java:856) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157) at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:39) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:704) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:474) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:409) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:312) at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:97) at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:250) at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:928) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:705) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:625) at org.springframework.web.servlet.FrameworkServlet.serviceWrapper(FrameworkServlet.java:386) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:346) at javax.servlet.http.HttpServlet.service(HttpServlet.java:743) at javax.servlet.http.HttpServlet.service(HttpServlet.java:856) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157) at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:118) at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929) at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705) at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683) at java.lang.Thread.run(Thread.java:595)