我需要将 JSF 2 用于在 Websphere 7.0.0.13 下运行的应用程序，我遵循了这个：
http://www.manorrock.com/online/wiki/app/page/edit.html
***它说：
Even though Websphere 7 does not formally support JSF 2.0 you can get it to work in a degraded mode. Follow the steps below to get it to work on your version of Websphere 7.
Upgrade to at least version 7.0.0.13
Ship the Mojarra JAR files in your WEB-INF/lib directory
Set the WAR classloader to PARENT_LAST
Set the EAR classloader to PARENT_LAST and APPLICATION
Note the degraded mode means you are NOT going to be able to use @Resource or any JPA annotations. If you think you need support for it contact your IBM representative.
Note it will process @PostConstruct and @PreDestroy.***
我这样做了，但是在日志中出现了这个错误：
[8/30/13 22:51:32:702 CDT] 0000000c webapp E com.ibm.ws.webcontainer.webapp.WebApp notifyServletContextCreated SRVE0283E: Exception caught while initializing context: {0}
java.lang.LinkageError: loading constraint violation: loader "com/ibm/ws/classloader/CompoundClassLoader@31c031c" previously initiated loading for a different type with name "javax/servlet/ServletContext" defined by loader "org/eclipse/osgi/internal/baseadaptor/DefaultClassLoader@66656665"
at com.sun.faces.config.WebConfiguration.getInstance(WebConfiguration.java:184)
at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:163)
at com.ibm.ws.webcontainer.webapp.WebApp.notifyServletContextCreated(WebApp.java:1681)
at com.ibm.ws.webcontainer.webapp.WebApp.commonInitializationFinish(WebApp.java:374)
at com.ibm.ws.webcontainer.webapp.WebAppImpl.initialize(WebAppImpl.java:299)
at com.ibm.ws.webcontainer.webapp.WebGroupImpl.addWebApplication(WebGroupImpl.java:100
我的页面上的错误：
Error 404: javax.servlet.UnavailableException: SRVE0201E: Servlet [javax.faces.webapp.FacesServlet]: not a servlet class
这是我的 web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<display-name>testJSF2</display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>Faces Servlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>*.faces</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>*.jsf</url-pattern>
</servlet-mapping>
</web-app>
我通过以下方式访问：
..../testJSF2/index.faces
如果我通过以下方式输入：
..../testJSF2/index.jsp
在页面中得到这个：
HTTP Error Code: 500
Error Message:
JSPG0049E: /index.jsp failed to compile :
/opt/IBM/WebSphere/AppServer/profiles/AppSrv01/temp/wasccNode01/server4/testJSF2EAR/testJSF2.war/_index.java : 48 : The method getJspApplicationContext(ServletContext) is undefined for the type JspFactory
/opt/IBM/WebSphere/AppServer/profiles/AppSrv01/temp/wasccNode01/server4/testJSF2EAR/testJSF2.war/_index.java : 100 : The method handlePageException(Exception) in the type PageContext is not applicable for the arguments (Throwable)
JSPG0091E: An error occurred at line: 20 in the file: /index.jsp
JSPG0093E: Generated servlet error from file: /index.jsp
/opt/IBM/WebSphere/AppServer/profiles/AppSrv01/temp/wasccNode01/server4/testJSF2EAR/testJSF2.war/_index.java : 119 : The method getELContext() is undefined for the type PageContext
JSPG0091E: An error occurred at line: 21 in the file: /index.jsp
JSPG0093E: Generated servlet error from file: /index.jsp
/opt/IBM/WebSphere/AppServer/profiles/AppSrv01/temp/wasccNode01/server4/testJSF2EAR/testJSF2.war/_index.java : 144 : The method getELContext() is undefined for the type PageContext
根本原因：
com.ibm.ws.jsp.JspCoreException: JSPG0049E: /index.jsp failed to compile :
/opt/IBM/WebSphere/AppServer/profiles/AppSrv01/temp/wasccNode01/server4/testJSF2EAR/testJSF2.war/_index.java : 48 : The method getJspApplicationContext(ServletContext) is undefined for the type JspFactory
/opt/IBM/WebSphere/AppServer/profiles/AppSrv01/temp/wasccNode01/server4/testJSF2EAR/testJSF2.war/_index.java : 100 : The method handlePageException(Exception) in the type PageContext is not applicable for the arguments (Throwable)
JSPG0091E: An error occurred at line: 20 in the file: /index.jsp
JSPG0093E: Generated servlet error from file: /index.jsp
/opt/IBM/WebSphere/AppServer/profiles/AppSrv01/temp/wasccNode01/server4/testJSF2EAR/testJSF2.war/_index.java : 119 : The method getELContext() is undefined for the type PageContext
JSPG0091E: An error occurred at line: 21 in the file: /index.jsp
JSPG0093E: Generated servlet error from file: /index.jsp
/opt/IBM/WebSphere/AppServer/profiles/AppSrv01/temp/wasccNode01/server4/testJSF2EAR/testJSF2.war/_index.java : 144 : The method getELContext() is undefined for the type PageContext
at com.ibm.ws.jsp.webcontainerext.AbstractJSPExtensionServletWrapper.translateJsp(AbstractJSPExtensionServletWrapper.java:574)
at com.ibm.ws.jsp.webcontainerext.AbstractJSPExtensionServletWrapper._checkForTranslation(AbstractJSPExtensionServletWrapper.java:441)
at com.ibm.ws.jsp.webcontainerext.AbstractJSPExtensionServletWrapper.checkForTranslation(AbstractJSPExtensionServletWrapper.java:299)
at com.ibm.ws.jsp.webcontainerext.AbstractJSPExtensionServletWrapper.handleRequest(AbstractJSPExtensionServletWrapper.java:149)
at com.ibm.ws.webcontainer.webapp.WebApp.handleRequest(WebApp.java:3826)
at com.ibm.ws.webcontainer.webapp.WebGroup.handleRequest(WebGroup.java:276)
at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:931)
谢谢你的帮助。