No hints in the problems window that are of any help. The error I get
is:

WARNING: /features
org.apache.jasper.JasperException: Unable to compile class for JSP:
An error occurred at line: 11 in the generated java file
org.apache.jasper.runtime.HttpJspBase cannot be resolved to a type

And the first part of the stacktrace is:

Stacktrace:
        at
org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:
92)
        at
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:
330)
        at
org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:
439)
        at org.apache.jasper.compiler.Compiler.compile(Compiler.java:349)
        at org.apache.jasper.compiler.Compiler.compile(Compiler.java:327)
        at org.apache.jasper.compiler.Compiler.compile(Compiler.java:314)
        at
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:
592)

Thanks

On Dec 6, 4:52 pm, Jaroslav Záruba <jaroslav.zar...@gmail.com> wrote:
> What does the error message say?
> No hints in the Problems window?
>
>
>
>
>
>
>
> On Mon, Dec 6, 2010 at 5:42 PM, mscwd01 <mscw...@gmail.com> wrote:
> > This still doesn't solve the issue for me, mapping a servlet url
> > pattern to a jsp file always fails...
>
> > On Dec 6, 1:33 pm, Jaroslav Záruba <jaroslav.zar...@gmail.com> wrote:
> > > Thanks guys, moving AppEngine (and GWT) to the top in "Order and Export"
> > > really solved this.
>
> > > Thanks a lot :)
>
> > > On Sun, Dec 5, 2010 at 4:40 PM, Mike Friesen <mfrie...@gmail.com> wrote:
> > > > I had the same problem and fixed it by:
>
> > > > 1) Selecting project Root -> Goto File->Properties
> > > > 2) Select Java Build Path
> > > > 3) Select Order and Export
> > > > 4) Move App Engine SDK 1.4.0 to the #1 position and GWT SDK 2.1.0 to
> > the #2
> > > > position
>
> > > > On Sun, Dec 5, 2010 at 7:28 AM, Sudhir <sudhi...@gmail.com> wrote:
>
> > > >> Same issue here... does anyone have a fix that doesn't involve re-
> > > >> installing eclipse and recreating the entire project step by step?
>
> > > >> Sudhir
>
> > > >> On Dec 4, 4:37 pm, GoSharp Lite <gosharpl...@gmail.com> wrote:
> > > >> > I solve my jsp compilation issue by using below steps.
>
> > > >> > 1) Download and install "eclipse-java-helios-SR1-win32.zip".
> > > >> > 2) Install plugins from "http://dl.google.com/eclipse/plugin/3.6";.
> > > >> > 3) Download and install "java_ee_sdk-6u1-jdk-windows.exe".
> > > >> > 4) Create a new and empty app using same project name and package as
> > > >> > my old app.
> > > >> > 5) Carefully copy all files in src and war from my old app into the
> > > >> > new app.
> > > >> > 6) Import all external libs from my old app into the new app.
> > > >> > 7) Set Properties-Google-App Engine-ORM to server files which need
> > > >> > enhancement.
> > > >> > 8) Debug and no more "Unable to compile class for JSP".
>
> > > >> > On Dec 4, 11:47 am, Jerome <jerome.mou...@gmail.com> wrote:
>
> > > >> > > Sorry, no solution but a very similar issue with Eclipse Helios SR
> > 1:
>
> > > >> > > org.apache.jasper.JasperException: Unable to compile class for
> > JSP:
>
> > > >> > > An error occurred at line: 9 in the generated java file
> > > >> > > org.apache.jasper.runtime.HttpJspBase cannot be resolved to a type
>
> > > >> > > An error occurred at line: 10 in the generated java file
> > > >> > > org.apache.jasper.runtime.JspSourceDependent cannot be resolved to
> > a
> > > >> > > type
>
> > > >> > > An error occurred at line: 12 in the generated java file
> > > >> > > JspFactory cannot be resolved to a type
>
> > > >> > > An error occurred at line: 12 in the generated java file
> > > >> > > JspFactory cannot be resolved
>
> > > >> > > An error occurred at line: 23 in the generated java file
> > > >> > > javax.el.ExpressionFactory cannot be resolved to a type
>
> > > >> > > An error occurred at line: 24 in the generated java file
> > > >> > > org.apache.AnnotationProcessor cannot be resolved to a type
>
> > > >> > > An error occurred at line: 31 in the generated java file
> > > >> > > _el_expressionfactory cannot be resolved
>
> > > >> > > An error occurred at line: 31 in the generated java file
> > > >> > > _jspxFactory cannot be resolved
>
> > > >> > > An error occurred at line: 31 in the generated java file
> > > >> > > The method getServletConfig() is undefined for the type plans_jsp
>
> > > >> > > An error occurred at line: 32 in the generated java file
> > > >> > > _jsp_annotationprocessor cannot be resolved
>
> > > >> > > An error occurred at line: 32 in the generated java file
> > > >> > > org.apache.AnnotationProcessor cannot be resolved to a type
>
> > > >> > > An error occurred at line: 32 in the generated java file
> > > >> > > The method getServletConfig() is undefined for the type plans_jsp
>
> > > >> > > An error occurred at line: 32 in the generated java file
> > > >> > > org.apache.AnnotationProcessor cannot be resolved to a type
>
> > > >> > > An error occurred at line: 38 in the generated java file
> > > >> > > HttpServletRequest cannot be resolved to a type
>
> > > >> > > An error occurred at line: 38 in the generated java file
> > > >> > > HttpServletResponse cannot be resolved to a type
>
> > > >> > > An error occurred at line: 39 in the generated java file
> > > >> > > ServletException cannot be resolved to a type
>
> > > >> > > An error occurred at line: 41 in the generated java file
> > > >> > > PageContext cannot be resolved to a type
>
> > > >> > > An error occurred at line: 42 in the generated java file
> > > >> > > HttpSession cannot be resolved to a type
>
> > > >> > > An error occurred at line: 43 in the generated java file
> > > >> > > ServletContext cannot be resolved to a type
>
> > > >> > > An error occurred at line: 44 in the generated java file
> > > >> > > ServletConfig cannot be resolved to a type
>
> > > >> > > An error occurred at line: 45 in the generated java file
> > > >> > > JspWriter cannot be resolved to a type
>
> > > >> > > An error occurred at line: 47 in the generated java file
> > > >> > > JspWriter cannot be resolved to a type
>
> > > >> > > An error occurred at line: 48 in the generated java file
> > > >> > > PageContext cannot be resolved to a type
>
> > > >> > > An error occurred at line: 53 in the generated java file
> > > >> > > _jspxFactory cannot be resolved
>
> > > >> > > An error occurred at line: 1,315 in the generated java file
> > > >> > > SkipPageException cannot be resolved to a type
>
> > > >> > > An error occurred at line: 1,322 in the generated java file
> > > >> > > _jspxFactory cannot be resolved
>
> > > >> > > Stacktrace:
> > > >> > >         at
>
> > org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandl
> > > >> er.java:
> > > >> > > 92)
> > > >> > >         at
>
> > org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:
> > > >> > > 330)
> > > >> > >         at
>
> > org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:
> > > >> > > 439)
> > > >> > >         at
> > > >> org.apache.jasper.compiler.Compiler.compile(Compiler.java:349)
> > > >> > >         at
> > > >> org.apache.jasper.compiler.Compiler.compile(Compiler.java:327)
> > > >> > >         at
> > > >> org.apache.jasper.compiler.Compiler.compile(Compiler.java:314)
> > > >> > >         at
>
> > org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:
> > > >> > > 592)
> > > >> > >         at
>
> > org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:
> > > >> > > 317)
> > > >> > >         at
>
> > org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:
> > > >> > > 313)
> > > >> > >         at
> > > >> org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
> > > >> > >         at
> > > >> com.google.appengine.tools.development.PrivilegedJspServlet.access
> > > >> > > $101(PrivilegedJspServlet.java:23)
> > > >> > >         at
> > com.google.appengine.tools.development.PrivilegedJspServlet
> > > >> > > $2.run(PrivilegedJspServlet.java:59)
> > > >> > >         at java.security.AccessController.doPrivileged(Native
> > Method)
> > > >> > >         at
>
> > com.google.appengine.tools.development.PrivilegedJspServlet.service(Privile
> > > >> gedJspServlet.java:
> > > >> > > 57)
> > > >> > >         at
> > > >> javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
> > > >> > >         at
> > > >> org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
> > > >> > > 511)
> > > >> > >         at org.mortbay.jetty.servlet.ServletHandler
> > > >> > > $CachedChain.doFilter(ServletHandler.java:1166)
> > > >> > >         at
>
> > com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFi
> > > >> lter.java:
> > > >> > > 58)
> > > >> > >         at org.mortbay.jetty.servlet.ServletHandler
> > > >> > > $CachedChain.doFilter(ServletHandler.java:1157)
> > > >> > >         at
>
> > com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(Trans
> > > >> actionCleanupFilter.java:
> > > >> > > 43)
> > > >> > >         at org.mortbay.jetty.servlet.ServletHandler
> > > >> > > $CachedChain.doFilter(ServletHandler.java:1157)
> > > >> > >         at
>
> > com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFile
> > > >> Filter.java:
> > > >> > > 122)
> > > >> > >         at org.mortbay.jetty.servlet.ServletHandler
> > > >> > > $CachedChain.doFilter(ServletHandler.java:1157)
> > > >> > >         at
>
> > org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:
> > > >> > > 388)
> > > >> > >         at
>
> > org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:
> > > >> > > 216)
> > > >> > >         at
>
> > org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:
> > > >> > > 182)
> > > >> > >         at
>
> > org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:
> > > >> > > 765)
> > > >> > >         at
> > > >> org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
> > > >> > > 418)
> > > >> > >         at
>
> > com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEn
> > > >> gineWebAppContext.java:
> > > >> > > 70)
> > > >> > >         at
>
> > org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
> > > >> > > 152)
> > > >> > >         at
> > > >> com.google.appengine.tools.development.JettyContainerService
> > > >> > > $ApiProxyHandler.handle(JettyContainerService.java:349)
> > > >> > >         at
>
> > org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
> > > >> > > 152)
> > > >> > >         at org.mortbay.jetty.Server.handle(Server.java:326)
> > > >> > >         at
> > > >> org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
> > > >> > > 542)
> > > >> > >         at org.mortbay.jetty.HttpConnection
> > > >> > > $RequestHandler.headerComplete(HttpConnection.java:923)
> > > >> > >         at
> > org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:547)
> > > >> > >         at
> > > >> org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
> > > >> > >         at
>
> ...
>
> read more »

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