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);
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
at mas.TestFilter.doFilter(Store/LanguageFilter.java:35)
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.
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