See below.
On Wed, 27 Nov 2002, Stephen Riek wrote:
> Date: Wed, 27 Nov 2002 05:55:11 +0000 (GMT)
> From: Stephen Riek <[EMAIL PROTECTED]>
> Reply-To: Tomcat Users List <[EMAIL PROTECTED]>
> To: Tomcat Users List <[EMAIL PROTECTED]>
> Subject: Tomcat Filter with RequestDispatcher -
> IncompatibleClassChangeError
>
>
> I've been at this for the better half of a day already
> without joy. Am trying to create a Filter which accepts
> a request for "/fr/Products/Toys/index.jsp" and forwards
> the request to "/Products/Toys/index.jsp" after setting
> an attribute "lang" to "fr".
>
> However, no matter what I try, the following error is
> produced: "java.lang.IncompatibleClassChangeError".
> I have tested the URL "/Products/Toys/index.jsp" directly
> in a browser and there is no problem with it, and using
> System.out.println calls, I have deduced that the error
> lies in the rd.forward(request, response) line.
>
> Does anybody have any idea why this may be happening?
> I'm using Tomcat4.0
>
>
> Filter Source Code
> ------------------
>
> public final class LanguageFilter implements Filter {
>
> private FilterConfig filterConfig = null;
>
> public void init(FilterConfig filterConfig) {
> this.filterConfig = filterConfig;
> }
>
> public void doFilter(ServletRequest request, ServletResponse response, FilterChain
>chain) throws IOException, ServletException {
> String servletPath = ((HttpServletRequest) request).getServletPath();
> // If path starts with "/fr/", set the lang to "fr".
> if (servletPath.indexOf("/fr/") == 0) {
> request.setAttribute("lang", "fr");
> String targetURL = servletPath.substring(3);
You probably don't want to do this *unless* the path starts with "/fr",
right?
> System.out.println("targetURL = " + targetURL);
> RequestDispatcher rd = null;
> ServletContext sc = this.filterConfig.getServletContext();
> rd = sc.getRequestDispatcher(targetURL);
> System.out.println("ok, RequestDispatcher created");
> if (rd!=null) {
> rd.forward(request, response);
> return;
> }
> chain.doFilter(request, response);
> }
>
>
>
> Error Trace
> -----------
>
> java.lang.IncompatibleClassChangeError
This exception normally means you have made a change in a superclass and
recompiled it, but not recompiled a subclass that depends on the old APIs.
> at mas.TestFilter.doFilter(Store/LanguageFilter.java:35)
What is "Store"? Is that supposed to be the package name?
You should recompile *all* your classes to catch any cases where you've
made incompatible changes.
> at
>org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:213)
> at
>org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
> at
>org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)
> at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
> at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
> at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
>
> Thank you for helping,
>
> Stephen.
>
Craig
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