When using a welcome-page forwarding from the context-root, eg.

URL: http://localhost:8080/WebApp/

web.xml:
<welcome-file-list>
    <welcome-file>main.jspx</welcome-file>
</welcome-file-list>

You'll run into an NPE when FileServer.service() tries to parse the context-root:

String mimeType = mimeTypeMatcher.mimeTypeFor(path);

If path is "/" the mimetype will be null.


SEVERE: Servlet.service() for servlet Persistent Faces Servlet threw exception
java.lang.NullPointerException
at java.util.regex.Matcher.getTextLength(Matcher.java:1127)
at java.util.regex.Matcher.reset(Matcher.java:284)
at java.util.regex.Matcher.<init>(Matcher.java:205)
at java.util.regex.Pattern.matcher(Pattern.java:879)
at com.icesoft.faces.webapp.http.servlet.ServletRequestResponse.setHeader(ServletRequestResponse.java:156)
at com.icesoft.faces.webapp.http.common.ResponseProxy.setHeader(ResponseProxy.java:20)
at com.icesoft.faces.webapp.http.core.FileServer$1.respond(FileServer.java:33)
at com.icesoft.faces.webapp.http.common.standard.CompressingServer$CompressingRequest$1.respond(CompressingServer.java:45)
at com.icesoft.faces.webapp.http.servlet.ServletRequestResponse.respondWith(ServletRequestResponse.java:147)
at com.icesoft.faces.webapp.http.common.standard.CompressingServer$CompressingRequest.respondWith(CompressingServer.java:42)
at com.icesoft.faces.webapp.http.core.FileServer.service(FileServer.java:28)
at com.icesoft.faces.webapp.http.common.standard.PathDispatcherServer$Matcher.serviceOnMatch(PathDispatcherServer.java:50)
at com.icesoft.faces.webapp.http.common.standard.PathDispatcherServer.service(PathDispatcherServer.java:19)
at com.icesoft.faces.webapp.http.common.standard.CompressingServer.service(CompressingServer.java:26)
at com.icesoft.faces.webapp.http.core.ResourceServer.service(ResourceServer.java:30)
at com.icesoft.faces.webapp.http.servlet.BasicAdaptingServlet.service(BasicAdaptingServlet.java:16)
at com.icesoft.faces.webapp.http.servlet.PathDispatcher$Matcher.serviceOnMatch(PathDispatcher.java:52)
at com.icesoft.faces.webapp.http.servlet.PathDispatcher.service(PathDispatcher.java:29)
at com.icesoft.faces.webapp.http.servlet.MainServlet.service(MainServlet.java:76)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:210)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:870)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:685)
at java.lang.Thread.run(Thread.java:595)