[prev in list] [next in list] [prev in thread] [next in thread] 

List:       tomcat-user
Subject:    Re: Tomcat 8.5.12 - NPE when using RequestDispatcher
From:       Thomas DELHOMENIE <thomas.delhomenie () gmail ! com>
Date:       2017-03-23 20:55:20
Message-ID: CAGLRGuVGeC0uxBgTLY+HeCVR+W77J=tQwnmvP=m4UiMRZ3dLww () mail ! gmail ! com
[Download RAW message or body]


2017-03-23 21:50 GMT+01:00 Violeta Georgieva <violetagg@apache.org>:

> Hi,
>
> 2017-03-23 22:47 GMT+02:00 Thomas DELHOMENIE <thomas.delhomenie@gmail.com
> >:
> >
> > Hi,
> >
> > With Tomcat 8.5.12 I hit a NPE when I use RequestDispatcher to redirect
> > from a servlet to another one in the case of the mapping of this second
> > servlet ends with /*. An error 500 is returned because of a
> > NullPointerException :
>
> Most probably you are facing this issue [1].
> The fix will be available in 8.5.13.
>
> Regards,
> Violeta
>
> [1] https://bz.apache.org/bugzilla/show_bug.cgi?id=60882


Yes, very probably :)
Thanks!


>
>
> >  java.lang.NullPointerException
> >         at
> >
> org.apache.catalina.core.ApplicationMapping.getServletMapping(
> ApplicationMapping.java:62)
> >         at
> >
> org.apache.catalina.core.ApplicationContext.getRequestDispatcher(
> ApplicationContext.java:486)
> >         at
> >
> org.apache.catalina.core.ApplicationContextFacade.getRequestDispatcher(
> ApplicationContextFacade.java:222)
> >         at org.exoplatform.RedirectServlet.doGet(
> RedirectServlet.java:19)
> >         at javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
> >         at javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
> >         at
> >
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(
> ApplicationFilterChain.java:230)
> >         at
> >
> org.apache.catalina.core.ApplicationFilterChain.doFilter(
> ApplicationFilterChain.java:165)
> >         at
> > org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
> >         at
> >
> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(
> ApplicationFilterChain.java:192)
> >         at
> >
> org.apache.catalina.core.ApplicationFilterChain.doFilter(
> ApplicationFilterChain.java:165)
> >         at
> >
> org.apache.catalina.core.StandardWrapperValve.invoke(
> StandardWrapperValve.java:198)
> >         at
> >
> org.apache.catalina.core.StandardContextValve.invoke(
> StandardContextValve.java:96)
> >         at
> >
> org.apache.catalina.core.StandardHostValve.invoke(
> StandardHostValve.java:140)
> >         at
> >
> org.apache.catalina.valves.ErrorReportValve.invoke(
> ErrorReportValve.java:80)
> >         at
> >
> org.apache.catalina.valves.AbstractAccessLogValve.invoke(
> AbstractAccessLogValve.java:624)
> >         at
> >
> org.apache.catalina.core.StandardEngineValve.invoke(
> StandardEngineValve.java:87)
> >         at
> >
> org.apache.catalina.connector.CoyoteAdapter.service(
> CoyoteAdapter.java:341)
> >         at
> > org.apache.coyote.http11.Http11Processor.service(
> Http11Processor.java:783)
> >         at
> >
> org.apache.coyote.AbstractProcessorLight.process(
> AbstractProcessorLight.java:66)
> >         at
> >
> org.apache.coyote.AbstractProtocol$ConnectionHandler.process(
> AbstractProtocol.java:798)
> >         at
> >
> org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.
> doRun(NioEndpoint.java:1441)
> >         at
> >
> org.apache.tomcat.util.net.SocketProcessorBase.run(
> SocketProcessorBase.java:49)
> >         at
> >
> java.base/java.util.concurrent.ThreadPoolExecutor.
> runWorker(ThreadPoolExecutor.java:1161)
> >         at
> >
> java.base/java.util.concurrent.ThreadPoolExecutor$
> Worker.run(ThreadPoolExecutor.java:635)
> >         at
> >
> org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(
> TaskThread.java:61)
> >         at java.base/java.lang.Thread.run(Thread.java:844)
> >
> > To reproduce this issue I created a simple war with the following web.xml
> :
> >
> > <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
> >   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
> >   xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
> >                       http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd
> "
> >   version="3.1"
> >   metadata-complete="true">
> >
> >     <description>
> >       Servlet and JSP Examples.
> >     </description>
> >     <display-name>Servlet and JSP Examples</display-name>
> >
> >     <servlet>
> >       <servlet-name>HelloWorldExample</servlet-name>
> >       <servlet-class>org.sample.HelloWorldServlet</servlet-class>
> >     </servlet>
> >     <servlet>
> >         <servlet-name>RedirectServlet</servlet-name>
> >         <servlet-class>org.sample.RedirectServlet</servlet-class>
> >     </servlet>
> >
> >     <servlet-mapping>
> >         <servlet-name>HelloWorldExample</servlet-name>
> >         <url-pattern>/HelloWorldExample/*</url-pattern>
> >     </servlet-mapping>
> >     <servlet-mapping>
> >         <servlet-name>RedirectServlet</servlet-name>
> >         <url-pattern>/RedirectServlet</url-pattern>
> >     </servlet-mapping>
> > </web-app>
> >
> > The class RedirectServlet is :
> >
> > package org.sample;
> >
> > import javax.servlet.RequestDispatcher;
> > import javax.servlet.ServletException;
> > import javax.servlet.http.HttpServlet;
> > import javax.servlet.http.HttpServletRequest;
> > import javax.servlet.http.HttpServletResponse;
> > import java.io.IOException;
> >
> > public class RedirectServlet extends HttpServlet {
> >   @Override
> >   public void doGet(HttpServletRequest request,
> >                     HttpServletResponse response)
> >           throws IOException, ServletException
> >   {
> >     RequestDispatcher requestDispatcher =
> > request.getServletContext().getRequestDispatcher("/HelloWorldExample");
> >     requestDispatcher.forward(request, response);
> >   }
> > }
> >
> > And the class HelloWorldServlet is :
> >
> > package org.sample;
> >
> > import javax.servlet.ServletException;
> > import javax.servlet.http.HttpServlet;
> > import javax.servlet.http.HttpServletRequest;
> > import javax.servlet.http.HttpServletResponse;
> > import java.io.IOException;
> > import java.io.PrintWriter;
> >
> > public class HelloWorldServlet extends HttpServlet {
> >   @Override
> >   public void doGet(HttpServletRequest request,
> >                     HttpServletResponse response)
> >           throws IOException, ServletException
> >   {
> >     PrintWriter out = response.getWriter();
> >
> >     out.println("<!DOCTYPE html><html>");
> >     out.println("<head>");
> >     out.println("<meta charset=\"UTF-8\" />");
> >     out.println("<title>Hello World</title>");
> >     out.println("</head>");
> >     out.println("<body bgcolor=\"white\">");
> >     out.println("<a href=\"../helloworld.html\">");
> >     out.println("<img src=\"../images/code.gif\" height=24 " +
> >             "width=24 align=right border=0 alt=\"view code\"></a>");
> >     out.println("<a href=\"../index.html\">");
> >     out.println("<img src=\"../images/return.gif\" height=24 " +
> >             "width=24 align=right border=0 alt=\"return\"></a>");
> >     out.println("<h1>Hello World !</h1>");
> >     out.println("</body>");
> >     out.println("</html>");
> >   }
> > }
> >
> > I do not have this issue with Tomcat 8.5.11.
> > I also do not have this issue if I change the mapping of the servlet
> > HelloWorldExample to "/HelloWorldExample" instead of
> "/HelloWorldExample/*".
> >
> > It looks like a bug but I wanted to be sure of that before opening an
> issue
> > in the bugtracker. Should I open one ?
> >
> > Thanks
>


[prev in list] [next in list] [prev in thread] [next in thread]