WTP/JSF-java. Lang. classnotfoundexception: javax. Faces. webapp. facesservlet

 

From: http://babyblue2004.bokee.com/5733663.html

I read an article (http://www.eclipse.org/webtools/jsf/dev_resource/JSFTutorial-RC3/JSFTools_tutorial.html) at www.eclipse.org over the past few days, following the above as a JSF program. The following problems occur:

Severe: error loading webappclassloader
Delegate: false
Repositories:
/WEB-INF/classes/
----------> Parent classloader:
Org. Apache. Catalina. loader. standardclassloader @ 184ec44
Javax. Faces. webapp. facesservlet
Java. Lang. classnotfoundexception: javax. Faces. webapp. facesservlet
At org. Apache. Catalina. loader. webappclassloader. loadclass (webappclassloader. Java: 1355)
At org. Apache. Catalina. loader. webappclassloader. loadclass (webappclassloader. Java: 1201)
At org. Apache. Catalina. Core. standardwrapper. loadservlet (standardwrapper. Java: 1034)
At org. Apache. Catalina. Core. standardwrapper. Load (standardwrapper. Java: 932)
At org. Apache. Catalina. Core. standardcontext. loadonstartup (standardcontext. Java: 3951)
At org. Apache. Catalina. Core. standardcontext. Start (standardcontext. Java: 4225)
At org. Apache. Catalina. Core. containerbase. addchildinternal (containerbase. Java: 759)
At org. Apache. Catalina. Core. containerbase. addchild (containerbase. Java: 739)
At org. Apache. Catalina. Core. standardhost. addchild (standardhost. Java: 524)
At org. Apache. Catalina. startup. hostconfig. deploydirectory (hostconfig. Java: 904)
At org. Apache. Catalina. startup. hostconfig. deploydirectories (hostconfig. Java: 867)
At org. Apache. Catalina. startup. hostconfig. deployapps (hostconfig. Java: 474)
At org. Apache. Catalina. startup. hostconfig. Check (hostconfig. Java: 1190)
At org. Apache. Catalina. startup. hostconfig. lifecycleevent (hostconfig. Java: 292)
At org. Apache. Catalina. util. lifecyclesupport. firelifecycleevent (lifecyclesupport. Java: 119)
At org. Apache. Catalina. Core. containerbase. backgroundprocess (containerbase. Java: 1305)
At org. Apache. Catalina. Core. containerbase $ containerbackgroundprocessor. processchil.pdf (containerbase. Java: 1569)
At org. Apache. Catalina. Core. containerbase $ containerbackgroundprocessor. processchil.pdf (containerbase. Java: 1578)
At org. Apache. Catalina. Core. containerbase $ containerbackgroundprocessor. Run (containerbase. Java: 1558)
At java. Lang. thread. Run (unknown source)
2006-10-8 9:51:58 org. Apache. Catalina. Core. standardcontext loadonstartup
Severe: Servlet/jsftutorial threw load () exception
Java. Lang. classnotfoundexception: javax. Faces. webapp. facesservlet
At org. Apache. Catalina. loader. webappclassloader. loadclass (webappclassloader. Java: 1355)
At org. Apache. Catalina. loader. webappclassloader. loadclass (webappclassloader. Java: 1201)
At org. Apache. Catalina. Core. standardwrapper. loadservlet (standardwrapper. Java: 1034)
At org. Apache. Catalina. Core. standardwrapper. Load (standardwrapper. Java: 932)
At org. Apache. Catalina. Core. standardcontext. loadonstartup (standardcontext. Java: 3951)
At org. Apache. Catalina. Core. standardcontext. Start (standardcontext. Java: 4225)
At org. Apache. Catalina. Core. containerbase. addchildinternal (containerbase. Java: 759)
At org. Apache. Catalina. Core. containerbase. addchild (containerbase. Java: 739)
At org. Apache. Catalina. Core. standardhost. addchild (standardhost. Java: 524)
At org. Apache. Catalina. startup. hostconfig. deploydirectory (hostconfig. Java: 904)
At org. Apache. Catalina. startup. hostconfig. deploydirectories (hostconfig. Java: 867)
At org. Apache. Catalina. startup. hostconfig. deployapps (hostconfig. Java: 474)
At org. Apache. Catalina. startup. hostconfig. Check (hostconfig. Java: 1190)
At org. Apache. Catalina. startup. hostconfig. lifecycleevent (hostconfig. Java: 292)
At org. Apache. Catalina. util. lifecyclesupport. firelifecycleevent (lifecyclesupport. Java: 119)
At org. Apache. Catalina. Core. containerbase. backgroundprocess (containerbase. Java: 1305)
At org. Apache. Catalina. Core. containerbase $ containerbackgroundprocessor. processchil.pdf (containerbase. Java: 1569)
At org. Apache. Catalina. Core. containerbase $ containerbackgroundprocessor. processchil.pdf (containerbase. Java: 1578)
At org. Apache. Catalina. Core. containerbase $ containerbackgroundprocessor. Run (containerbase. Java: 1558)
At java. Lang. thread. Run (unknown source)

The cause of the problem seems to be that javax. Faces. webapp. facesservlet is not found, but I put the class package in classpath, which can be seen in "Libraries" of Eclipse. Why?

Why does Tomcat go to WEB-INF/classes to find this file?

It took me a whole day to solve this problem.

Refer to the two articles
1. http://dev.eclipse.org/mhonarc/lists/wtp-jsf-dev/msg00158.html
2. http://forum.java.sun.com/thread.jspa? Forumid = 427 & threadid = 598929

Step 1:
Deploy the jar package in class_path to the WEB-INF directory. This is configured in the properties of the project. Select JSF library refererences and select deploy jars to WEB-INF/lib ".
Step 2:
At this time, the error "Java. Lang. nullpointerexception" appears, with the content "javax. Faces. webapp. facesservlet. init ". According to the second article, this problem occurs because the factoryfinder. getfactory () Factory method does not return the corresponding factory correctly. This is a configuration problem. reconfigure it.

<Listener>
<Listener-class>
Com. Sun. Faces. config. configurelistener
</Listener-class>
</Listener>

Delete the <load-on-starup> 1 </load-on-starup> tag.

PS: You test, may be different versions, did not find the "JSF library references" option, so directly under the/WEB-INF to create/lib folder and responsible for the relevant JSF jar package to the directory, run without exception