[Tomcat 8] [Listener Web] [RequestDispatcher]
Hello, I use on my application a web listener ( ServletContextListener ) that allows you to compile jsp at startup . It does not work on Tomcat 8 in call : servletContext.getRequestDispatcher ( path); Here is the stack : org.apache.catalina.core.ApplicationContext.log Error during mapping java.lang.NullPointerException at org.apache.catalina.mapper.Mapper.internalMapWrapper(Mapper.java:842) at org.apache.catalina.mapper.Mapper.map(Mapper.java:712) at org.apache.catalina.core.ApplicationContext.getRequestDispatcher(ApplicationContext.java:503) at org.apache.catalina.core.ApplicationContextFacade.getRequestDispatcher(ApplicationContextFacade.java:221) at fr.ms.tomcat.servlet.listener.JspCompileRunnable.run(JspCompileRunnable.java:25) This is occurs when the map contextObjectToContextVersionMap is still null. It is enriched at the end of the boot StandardServer so after initializing listeners . Thread [main] (Suspended (breakpoint at line 265 in Mapper)) owns: MapperListener (id=456) owns: StandardService (id=457) owns: Object (id=458) owns: StandardServer (id=459) Mapper.addContextVersion(String, Host, String, String, Context, String[], WebResourceRoot, Collection) line: 265 MapperListener.registerContext(Context) line: 380 MapperListener.registerHost(Host) line: 302 MapperListener.startInternal() line: 110 MapperListener(LifecycleBase).start() line: 150 StandardService.startInternal() line: 450 StandardService(LifecycleBase).start() line: 150 StandardServer.startInternal() line: 769 StandardServer(LifecycleBase).start() line: 150 Catalina.start() line: 625 NativeMethodAccessorImpl.invoke0(Method, Object, Object[]) line: not available [native method] NativeMethodAccessorImpl.invoke(Object, Object[]) line: 57 DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 43 Method.invoke(Object, Object...) line: 606 Bootstrap.start() line: 351 Bootstrap.main(String[]) line: 485 it works fine with tomcat 5, 6 and 7. Environnement : apache- tomcat- 8.0.15 or apache -tomcat- 8.0.18 Windows 8.1 Java 7 update 75 Thank you.
Re: [Tomcat 8] [Listener Web] [RequestDispatcher]
Hello Christopher, Thank you for your answer and sorry for putting the wrong mailing list ;) 2015-02-19 20:22 GMT+01:00 Christopher Schultz : > -BEGIN PGP SIGNED MESSAGE- > Hash: SHA256 > > Marco, > > This is probably a question better asked on the user mailing list. I'm > cross-posting to both lists, and I'll give more feedback on the user list. > > - -chris > > On 2/19/15 11:25 AM, Marco Semiao wrote: > > I use on my application a web listener ( ServletContextListener ) > > that allows you to compile jsp at startup . > > > > It does not work on Tomcat 8 in call : > > servletContext.getRequestDispatcher ( path); > > > > Here is the stack : > > > > org.apache.catalina.core.ApplicationContext.log Error during > > mapping java.lang.NullPointerException at > > org.apache.catalina.mapper.Mapper.internalMapWrapper(Mapper.java:842) > > > > > at org.apache.catalina.mapper.Mapper.map(Mapper.java:712) > > at > > > org.apache.catalina.core.ApplicationContext.getRequestDispatcher(ApplicationContext.java:503) > > > > > at > > > org.apache.catalina.core.ApplicationContextFacade.getRequestDispatcher(ApplicationContextFacade.java:221) > > > > > at > > > fr.ms.tomcat.servlet.listener.JspCompileRunnable.run(JspCompileRunnable.java:25) > > > > > This is occurs when the map contextObjectToContextVersionMap is still null. > > > > It is enriched at the end of the boot StandardServer so after > > initializing listeners . > > > > Thread [main] (Suspended (breakpoint at line 265 in Mapper)) owns: > > MapperListener (id=456) owns: StandardService (id=457) owns: > > Object (id=458) owns: StandardServer (id=459) > > Mapper.addContextVersion(String, Host, String, String, Context, > > String[], WebResourceRoot, Collection) line: > > 265 MapperListener.registerContext(Context) line: 380 > > MapperListener.registerHost(Host) line: 302 > > MapperListener.startInternal() line: 110 > > MapperListener(LifecycleBase).start() line: 150 > > StandardService.startInternal() line: 450 > > StandardService(LifecycleBase).start() line: 150 > > StandardServer.startInternal() line: 769 > > StandardServer(LifecycleBase).start() line: 150 Catalina.start() > > line: 625 NativeMethodAccessorImpl.invoke0(Method, Object, > > Object[]) line: not available [native method] > > NativeMethodAccessorImpl.invoke(Object, Object[]) line: 57 > > DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 43 > > Method.invoke(Object, Object...) line: 606 Bootstrap.start() line: > > 351 Bootstrap.main(String[]) line: 485 > > > > > > > > it works fine with tomcat 5, 6 and 7. > > > > > > Environnement : apache- tomcat- 8.0.15 or apache -tomcat- 8.0.18 > > Windows 8.1 Java 7 update 75 > > > > > > Thank you. > > > -BEGIN PGP SIGNATURE- > Version: GnuPG v1 > Comment: GPGTools - http://gpgtools.org > > iQIcBAEBCAAGBQJU5jfqAAoJEBzwKT+lPKRYgYcP/3nIEDDxUvgsFn7nkyyGPmbP > NEPbJc+a95V71X/8UHyYTbwB/rp5NOKaDU8KwJMzolZi03A8tRID9JX4irqRJhAR > 7MpqCoAuW469zyxzUVlqRQK0rv9MB6PORZRZZ320yfFokWSapjoe7RC4sB/wTCXr > J5BxSV7l0hJOwuHSi9lq417EdCxVxm9y/kCdasMBG0t8eB11oQQER8y78tuuUdJQ > EaTiK8gxYyDeJstuep+tayLswmLHF6FFJxbzLoFxawPpSBpvjtZUGkNGtV1Wpu+C > i1D/V3oHm/rAgLeHZlpH7Zcq43jr7w0ev2t5PxisO9Kz/SgB2jEZfw8t7DqYmD64 > 2oWhVxB1xOnB86+6QkhWDtQ0gdc3gsUUilbMdUNE1Me7oTkTJQkq09h7nARmdiIT > 04w7mXJ55cC3YrKA0yncVYW0qRWBCfx5omNHhCU3OAaGXgrmLX4/ZoiKUK5zdK2s > IdZmXUbrlIN186YDXWd/lkzoF/SmLtvBSEOuAGHTXLCepP0Y7u3RdX473wqm9zh+ > pmA4tHg1HJQuwkIonC7dwJ7fROsU4V0Zvy5wQ5pu1Gm+zOxNsQ88WnZlzCbY0cct > e1PIgAkiFD6FiVtetvYfHPP3KMzNURN40OEkaBGY46NDUj9tPCe0tuZ8Yn8VEwXA > pULqLLdBRINZF0NLa/Qh > =rlyu > -END PGP SIGNATURE- > > - > To unsubscribe, e-mail: dev-unsubscr...@tomcat.apache.org > For additional commands, e-mail: dev-h...@tomcat.apache.org > >
Re: [Tomcat 8] [Listener Web] [RequestDispatcher]
ok this is new step since Tomcat 8 because the diff with Tomcat 7, it's this map "contextObjectToContextVersionMap". But in the web Listener, the method "requestInitialized" propose one instance of ServletContext and this found getRequestDispatcher. This method has not been used for any Tomcat 8 because getRequestDispatcher always return an exception ... If this is not a bug , it may be more preferable put a wrapper and returns to the call of getRequestDispatcher an UnsupportedOperationException , for example ... thank you again for your help 2015-02-19 21:40 GMT+01:00 Christopher Schultz : > Marco, > > On 2/19/15 3:38 PM, Marco Semiao wrote: > > Thank you for your answer and sorry for putting the wrong mailing list ;) > > Actually, after re-reading your post I think you were right to post to > dev@. Please see below. > > > 2015-02-19 20:22 GMT+01:00 Christopher Schultz < > ch...@christopherschultz.net > >> : > > > > Marco, > > > > This is probably a question better asked on the user mailing list. I'm > > cross-posting to both lists, and I'll give more feedback on the user > list. > > > > -chris > > > > On 2/19/15 11:25 AM, Marco Semiao wrote: > >>>> I use on my application a web listener ( ServletContextListener ) > >>>> that allows you to compile jsp at startup . > >>>> > >>>> It does not work on Tomcat 8 in call : > >>>> servletContext.getRequestDispatcher ( path); > >>>> > >>>> Here is the stack : > >>>> > >>>> org.apache.catalina.core.ApplicationContext.log Error during > >>>> mapping java.lang.NullPointerException at > >>>> org.apache.catalina.mapper.Mapper.internalMapWrapper(Mapper.java:842) > >>>> > >>>> > > at org.apache.catalina.mapper.Mapper.map(Mapper.java:712) > >>>> at > >>>> > > > org.apache.catalina.core.ApplicationContext.getRequestDispatcher(ApplicationContext.java:503) > >>>> > >>>> > > at > >>>> > > > org.apache.catalina.core.ApplicationContextFacade.getRequestDispatcher(ApplicationContextFacade.java:221) > >>>> > >>>> > > at > >>>> > > > fr.ms.tomcat.servlet.listener.JspCompileRunnable.run(JspCompileRunnable.java:25) > >>>> > >>>> > > This is occurs when the map contextObjectToContextVersionMap is still > null. > >>>> > >>>> It is enriched at the end of the boot StandardServer so after > >>>> initializing listeners . > >>>> > >>>> Thread [main] (Suspended (breakpoint at line 265 in Mapper)) owns: > >>>> MapperListener (id=456) owns: StandardService (id=457) owns: > >>>> Object (id=458) owns: StandardServer (id=459) > >>>> Mapper.addContextVersion(String, Host, String, String, Context, > >>>> String[], WebResourceRoot, Collection) line: > >>>> 265 MapperListener.registerContext(Context) line: 380 > >>>> MapperListener.registerHost(Host) line: 302 > >>>> MapperListener.startInternal() line: 110 > >>>> MapperListener(LifecycleBase).start() line: 150 > >>>> StandardService.startInternal() line: 450 > >>>> StandardService(LifecycleBase).start() line: 150 > >>>> StandardServer.startInternal() line: 769 > >>>> StandardServer(LifecycleBase).start() line: 150 Catalina.start() > >>>> line: 625 NativeMethodAccessorImpl.invoke0(Method, Object, > >>>> Object[]) line: not available [native method] > >>>> NativeMethodAccessorImpl.invoke(Object, Object[]) line: 57 > >>>> DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 43 > >>>> Method.invoke(Object, Object...) line: 606 Bootstrap.start() line: > >>>> 351 Bootstrap.main(String[]) line: 485 > >>>> > >>>> > >>>> > >>>> it works fine with tomcat 5, 6 and 7. > >>>> > >>>> > >>>> Environnement : apache- tomcat- 8.0.15 or apache -tomcat- 8.0.18 > >>>> Windows 8.1 Java 7 update 75 > > It certainly seems like this should work, but I can understand why the > Mapper doesn't actually map the context until it's completely started > up: otherwise, requests could come in before the application was ready. > > -chris > >
Re: [Tomcat 8] [Listener Web] [RequestDispatcher]
Hello, I just use this app : http://pukkaone.github.io/2010/12/22/jsp-precompile-application-start.html it's works with tomcat 5,6,7 but not tomcat 8. Because before, it's possibel to invoque RequestDispatcher into Listener Now, call RequestDispatcher throw NPE because the Map is empty. 2015-02-20 13:35 GMT+01:00 Konstantin Kolinko : > 2015-02-19 19:25 GMT+03:00 Marco Semiao : > > Hello, > > > > I use on my application a web listener ( ServletContextListener ) that > > allows you to compile jsp at startup . > > > > It does not work on Tomcat 8 in call : > > servletContext.getRequestDispatcher ( path); > > > > > > Here is the stack : > > > > org.apache.catalina.core.ApplicationContext.log Error during mapping > > java.lang.NullPointerException > > at org.apache.catalina.mapper.Mapper.internalMapWrapper(Mapper.java:842) > > at org.apache.catalina.mapper.Mapper.map(Mapper.java:712) > > at > > > org.apache.catalina.core.ApplicationContext.getRequestDispatcher(ApplicationContext.java:503) > > at > > > org.apache.catalina.core.ApplicationContextFacade.getRequestDispatcher(ApplicationContextFacade.java:221) > > at > > > fr.ms.tomcat.servlet.listener.JspCompileRunnable.run(JspCompileRunnable.java:25) > > This is occurs when the map contextObjectToContextVersionMap is still > null. > > > > It is enriched at the end of the boot StandardServer so after > initializing > > listeners . > > > > Thread [main] (Suspended (breakpoint at line 265 in Mapper)) > > owns: MapperListener (id=456) > > owns: StandardService (id=457) > > owns: Object (id=458) > > owns: StandardServer (id=459) > > Mapper.addContextVersion(String, Host, String, String, Context, String[], > > WebResourceRoot, Collection) line: 265 > > MapperListener.registerContext(Context) line: 380 > > MapperListener.registerHost(Host) line: 302 > > MapperListener.startInternal() line: 110 > > MapperListener(LifecycleBase).start() line: 150 > > StandardService.startInternal() line: 450 > > StandardService(LifecycleBase).start() line: 150 > > StandardServer.startInternal() line: 769 > > StandardServer(LifecycleBase).start() line: 150 > > Catalina.start() line: 625 > > NativeMethodAccessorImpl.invoke0(Method, Object, Object[]) line: not > > available [native method] > > NativeMethodAccessorImpl.invoke(Object, Object[]) line: 57 > > DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 43 > > Method.invoke(Object, Object...) line: 606 > > Bootstrap.start() line: 351 > > Bootstrap.main(String[]) line: 485 > > > > > > > > it works fine with tomcat 5, 6 and 7. > > > > > > Environnement : > > apache- tomcat- 8.0.15 or apache -tomcat- 8.0.18 > > Windows 8.1 > > Java 7 update 75 > > > > 1. Mailing list rules: > http://tomcat.apache.org/lists.html#tomcat-users > -> 6. Do not top-post. > > 2. What event is your listener listening for? > > If I am understanding you correctly, you are trying to perform a > request dispatch on a web application that has not started yet. This > is not going to work. The application that has not completed its > startup cannot serve requests. > > The NPE is ugly, an IllegalStateException would be better. > From the API specification [1] it looks that the > ServletContext.getRequestDispatcher() should return null in this > situation, but I think that will be as confusing as the current NPE. > > If you want the NPE to be changed, it would better to prepare some > source code that demonstrates the issue and open an issue in Bugzilla, > but at this point I think it is a cosmetic issue and fixing it > wouldn't solve your problem. > > [1] > http://docs.oracle.com/javaee/7/api/javax/servlet/ServletContext.html#getRequestDispatcher%28java.lang.String%29 > > > Best regards, > Konstantin Kolinko > > - > To unsubscribe, e-mail: dev-unsubscr...@tomcat.apache.org > For additional commands, e-mail: dev-h...@tomcat.apache.org > >
Re: [Tomcat 8] [Listener Web] [RequestDispatcher]
2015-02-20 13:45 GMT+01:00 Marco Semiao : > Hello, I just use this app : > > http://pukkaone.github.io/2010/12/22/jsp-precompile-application-start.html > > it's works with tomcat 5,6,7 but not tomcat 8. > > Because before, it's possibel to invoque RequestDispatcher into Listener > > Now, call RequestDispatcher throw NPE because the Map is empty. > > 2015-02-20 13:35 GMT+01:00 Konstantin Kolinko : > >> 2015-02-19 19:25 GMT+03:00 Marco Semiao : >> > Hello, >> > >> > I use on my application a web listener ( ServletContextListener ) that >> > allows you to compile jsp at startup . >> > >> > It does not work on Tomcat 8 in call : >> > servletContext.getRequestDispatcher ( path); >> > >> > >> > Here is the stack : >> > >> > org.apache.catalina.core.ApplicationContext.log Error during mapping >> > java.lang.NullPointerException >> > at org.apache.catalina.mapper.Mapper.internalMapWrapper(Mapper.java:842) >> > at org.apache.catalina.mapper.Mapper.map(Mapper.java:712) >> > at >> > >> org.apache.catalina.core.ApplicationContext.getRequestDispatcher(ApplicationContext.java:503) >> > at >> > >> org.apache.catalina.core.ApplicationContextFacade.getRequestDispatcher(ApplicationContextFacade.java:221) >> > at >> > >> fr.ms.tomcat.servlet.listener.JspCompileRunnable.run(JspCompileRunnable.java:25) >> > This is occurs when the map contextObjectToContextVersionMap is still >> null. >> > >> > It is enriched at the end of the boot StandardServer so after >> initializing >> > listeners . >> > >> > Thread [main] (Suspended (breakpoint at line 265 in Mapper)) >> > owns: MapperListener (id=456) >> > owns: StandardService (id=457) >> > owns: Object (id=458) >> > owns: StandardServer (id=459) >> > Mapper.addContextVersion(String, Host, String, String, Context, >> String[], >> > WebResourceRoot, Collection) line: 265 >> > MapperListener.registerContext(Context) line: 380 >> > MapperListener.registerHost(Host) line: 302 >> > MapperListener.startInternal() line: 110 >> > MapperListener(LifecycleBase).start() line: 150 >> > StandardService.startInternal() line: 450 >> > StandardService(LifecycleBase).start() line: 150 >> > StandardServer.startInternal() line: 769 >> > StandardServer(LifecycleBase).start() line: 150 >> > Catalina.start() line: 625 >> > NativeMethodAccessorImpl.invoke0(Method, Object, Object[]) line: not >> > available [native method] >> > NativeMethodAccessorImpl.invoke(Object, Object[]) line: 57 >> > DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 43 >> > Method.invoke(Object, Object...) line: 606 >> > Bootstrap.start() line: 351 >> > Bootstrap.main(String[]) line: 485 >> > >> > >> > >> > it works fine with tomcat 5, 6 and 7. >> > >> > >> > Environnement : >> > apache- tomcat- 8.0.15 or apache -tomcat- 8.0.18 >> > Windows 8.1 >> > Java 7 update 75 >> > >> >> 1. Mailing list rules: >> http://tomcat.apache.org/lists.html#tomcat-users >> -> 6. Do not top-post. >> >> 2. What event is your listener listening for? >> >> If I am understanding you correctly, you are trying to perform a >> request dispatch on a web application that has not started yet. This >> is not going to work. The application that has not completed its >> startup cannot serve requests. >> >> The NPE is ugly, an IllegalStateException would be better. >> From the API specification [1] it looks that the >> ServletContext.getRequestDispatcher() should return null in this >> situation, but I think that will be as confusing as the current NPE. >> >> If you want the NPE to be changed, it would better to prepare some >> source code that demonstrates the issue and open an issue in Bugzilla, >> but at this point I think it is a cosmetic issue and fixing it >> wouldn't solve your problem. >> >> [1] >> http://docs.oracle.com/javaee/7/api/javax/servlet/ServletContext.html#getRequestDispatcher%28java.lang.String%29 >> >> >> Best regards, >> Konstantin Kolinko >> >> - >> To unsubscribe, e-mail: dev-unsubscr...@tomcat.apache.org >> For additional commands, e-mail: dev-h...@tomcat.apache.org >> >> > Sorry really sorry for top post :( http://pukkaone.github.io/2010/12/22/jsp-precompile-application-start.html it's works with tomcat 5,6,7 but not tomcat 8. Because before, it's possibel to invoque RequestDispatcher into Listener Now, call RequestDispatcher throw NPE because the Map is empty.
Re: [Tomcat 8] [Listener Web] [RequestDispatcher]
2015-02-20 13:53 GMT+01:00 Marco Semiao : > > > 2015-02-20 13:45 GMT+01:00 Marco Semiao : > >> Hello, I just use this app : >> >> http://pukkaone.github.io/2010/12/22/jsp-precompile-application-start.html >> >> it's works with tomcat 5,6,7 but not tomcat 8. >> >> Because before, it's possibel to invoque RequestDispatcher into Listener >> >> Now, call RequestDispatcher throw NPE because the Map is empty. >> >> 2015-02-20 13:35 GMT+01:00 Konstantin Kolinko : >> >>> 2015-02-19 19:25 GMT+03:00 Marco Semiao : >>> > Hello, >>> > >>> > I use on my application a web listener ( ServletContextListener ) that >>> > allows you to compile jsp at startup . >>> > >>> > It does not work on Tomcat 8 in call : >>> > servletContext.getRequestDispatcher ( path); >>> > >>> > >>> > Here is the stack : >>> > >>> > org.apache.catalina.core.ApplicationContext.log Error during mapping >>> > java.lang.NullPointerException >>> > at >>> org.apache.catalina.mapper.Mapper.internalMapWrapper(Mapper.java:842) >>> > at org.apache.catalina.mapper.Mapper.map(Mapper.java:712) >>> > at >>> > >>> org.apache.catalina.core.ApplicationContext.getRequestDispatcher(ApplicationContext.java:503) >>> > at >>> > >>> org.apache.catalina.core.ApplicationContextFacade.getRequestDispatcher(ApplicationContextFacade.java:221) >>> > at >>> > >>> fr.ms.tomcat.servlet.listener.JspCompileRunnable.run(JspCompileRunnable.java:25) >>> > This is occurs when the map contextObjectToContextVersionMap is still >>> null. >>> > >>> > It is enriched at the end of the boot StandardServer so after >>> initializing >>> > listeners . >>> > >>> > Thread [main] (Suspended (breakpoint at line 265 in Mapper)) >>> > owns: MapperListener (id=456) >>> > owns: StandardService (id=457) >>> > owns: Object (id=458) >>> > owns: StandardServer (id=459) >>> > Mapper.addContextVersion(String, Host, String, String, Context, >>> String[], >>> > WebResourceRoot, Collection) line: 265 >>> > MapperListener.registerContext(Context) line: 380 >>> > MapperListener.registerHost(Host) line: 302 >>> > MapperListener.startInternal() line: 110 >>> > MapperListener(LifecycleBase).start() line: 150 >>> > StandardService.startInternal() line: 450 >>> > StandardService(LifecycleBase).start() line: 150 >>> > StandardServer.startInternal() line: 769 >>> > StandardServer(LifecycleBase).start() line: 150 >>> > Catalina.start() line: 625 >>> > NativeMethodAccessorImpl.invoke0(Method, Object, Object[]) line: not >>> > available [native method] >>> > NativeMethodAccessorImpl.invoke(Object, Object[]) line: 57 >>> > DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 43 >>> > Method.invoke(Object, Object...) line: 606 >>> > Bootstrap.start() line: 351 >>> > Bootstrap.main(String[]) line: 485 >>> > >>> > >>> > >>> > it works fine with tomcat 5, 6 and 7. >>> > >>> > >>> > Environnement : >>> > apache- tomcat- 8.0.15 or apache -tomcat- 8.0.18 >>> > Windows 8.1 >>> > Java 7 update 75 >>> > >>> >>> 1. Mailing list rules: >>> http://tomcat.apache.org/lists.html#tomcat-users >>> -> 6. Do not top-post. >>> >>> 2. What event is your listener listening for? >>> >>> If I am understanding you correctly, you are trying to perform a >>> request dispatch on a web application that has not started yet. This >>> is not going to work. The application that has not completed its >>> startup cannot serve requests. >>> >>> The NPE is ugly, an IllegalStateException would be better. >>> From the API specification [1] it looks that the >>> ServletContext.getRequestDispatcher() should return null in this >>> situation, but I think that will be as confusing as the current NPE. >>> >>> If you want the NPE to be changed, it would better to prepare some >>> source code that demonstrates the issue and open an issue in Bugzilla, >>> but at this point I think it is a cosmetic issue and fixing it >>> wouldn't solve your problem. >>> >>> [1] >>> http://docs.oracle.com/javaee/7/api/javax/servlet/ServletContext.html#getRequestDispatcher%28java.lang.String%29 >>> >>> >>> Best regards, >>> Konstantin Kolinko >>> >>> - >>> To unsubscribe, e-mail: dev-unsubscr...@tomcat.apache.org >>> For additional commands, e-mail: dev-h...@tomcat.apache.org >>> >>> >> > > Sorry really sorry for top post :( > > > http://pukkaone.github.io/2010/12/22/jsp-precompile-application-start.html > > it's works with tomcat 5,6,7 but not tomcat 8. > > Because before, it's possibel to invoque RequestDispatcher into Listener > > Now, call RequestDispatcher throw NPE because the Map is empty. > Before the requestDispatcher is ready into Listener why this limitation into Tomcat 8 ? it wanted ?
