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在 JSF 1.2 到 JSF 2 迁移后，我收到以下错误。java.lang.NullPointerException at com.sun.faces.application.view.FaceletViewHandlingStrategy.createView(FaceletViewHandlingStrategy.java:804) at c 这是如何引起的，我该如何解决？我尝试使用 2.0.11，它允许我登录并得到不同的错误，好像我尝试使用 2.2 得到以下错误。附上web.xml

http://java.sun.com/xml/ns/j2ee/web-app_2_5.xsd">

<display-name>sa-web</display-name>
<welcome-file-list>
    <welcome-file>/faces/pages/home.jsp</welcome-file>
</welcome-file-list>
<context-param>
    <param-name>javax.faces.FACELETS_LIBRARIES</param-name>
    <param-value>/WEB-INF/facelet-taglib/facelets-ui.taglib.xml;/WEB-INF/facelet-taglib/shale_validation.taglib.xml;/WEB-INF/facelet-taglib/tomahawk.taglib.xml;/WEB-INF/facelet-taglib/saui.taglib.xml;/WEB-INF/facelet-taglib/radien_security.taglib.xml
    </param-value>
</context-param>
<context-param>
    <param-name>javax.faces.CONFIG_FILES</param-name>
    <param-value>/WEB-INF/faces-config-global.xml</param-value>
</context-param>

<context-param>
    <param-name>javax.faces.DEFAULT_SUFFIX</param-name>
    <param-value>.jsp</param-value>
</context-param>
<context-param>
    <param-name>facelets.VIEW_MAPPINGS</param-name>
    <param-value>/pages/*;/templates/*;/public/*</param-value>
</context-param>
<context-param>
    <param-name>javax.faces.PROJECT_STAGE</param-name>
    <param-value>Development</param-value>
</context-param>
<context-param>
    <param-name>facelets.DEBUG</param-name>
    <param-value>true</param-value>
</context-param>
<context-param>
    <param-name>
        org.apache.shale.view.VIEW_CONTROLLER_MAPPER
    </param-name>
    <param-value>
        com.gmacfs.sa.web.framework.shale.ExtendedViewControllerMapper
    </param-value>
</context-param>
<filter>
    <filter-name>extensionsFilter</filter-name>
    <filter-class>org.apache.myfaces.webapp.filter.ExtensionsFilter
    </filter-class>
    <init-param>
        <description>Set the size limit for uploaded files.
            Format: 10 - 10 bytes
            10k - 10 KB
            10m - 10 MB
            1g - 1 GB
        </description>
        <param-name>uploadMaxFileSize</param-name>
        <param-value>100m</param-value>
    </init-param>
    <init-param>
        <description>Set the threshold size - files below this limit are
            stored
            in memory, files above this limit are stored on disk.
            Format: 10 - 10 bytes
            10k - 10 KB
            10m - 10 MB
            1g - 1 GB
        </description>
        <param-name>uploadThresholdSize</param-name>
        <param-value>100k</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>extensionsFilter</filter-name>
    <url-pattern>/faces/*</url-pattern>
</filter-mapping>

<filter-mapping>
    <filter-name>extensionsFilter</filter-name>
    <url-pattern>*.jsf</url-pattern>
</filter-mapping>
<filter>
    <display-name>AuthenticationFilter</display-name>
    <filter-name>AuthenticationFilter</filter-name>
    <filter-class>com.gmacfs.sa.web.framework.filters.AuthenticationFilter
    </filter-class>
</filter>
<filter-mapping>
    <filter-name>AuthenticationFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>
<listener>
    <listener-class>com.gmacfs.sa.web.framework.listeners.ValidatorsInitializer
    </listener-class>
</listener>

<servlet>
    <servlet-name>StartupServlet</servlet-name>
    <servlet-class>com.gmacfs.sa.framework.servlets.StartupServlet
    </servlet-class>
    <load-on-startup>2</load-on-startup>
</servlet>

<servlet>
    <servlet-name>ResourceServlet</servlet-name>
    <servlet-class>com.gmacfs.sa.framework.servlets.ResourceServlet
    </servlet-class>
    <load-on-startup>2</load-on-startup>
</servlet>

<servlet>
    <servlet-name>LogoutServlet</servlet-name>
    <servlet-class>com.gmacfs.sa.framework.servlets.LogoutServlet
    </servlet-class>
    <load-on-startup>2</load-on-startup>
</servlet>
<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>
<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>*.xhtml</url-pattern>
</servlet-mapping>
<servlet-mapping>
    <servlet-name>ResourceServlet</servlet-name>
    <url-pattern>/resource/*</url-pattern>
</servlet-mapping>
<servlet-mapping>
    <servlet-name>ResourceServlet</servlet-name>
    <url-pattern>/nocache-resource/*</url-pattern>
</servlet-mapping>


<servlet-mapping>
    <servlet-name>LogoutServlet</servlet-name>
    <url-pattern>/logout</url-pattern>
</servlet-mapping>

<servlet-mapping>
    <servlet-name>Faces Servlet</servlet-name>
    <url-pattern>/faces/*</url-pattern>
</servlet-mapping>
<servlet>
    <servlet-name>Logging Servlet</servlet-name>
    <servlet-class>com.gmacfs.sa.framework.servlets.GMACLoggingServlet
    </servlet-class>
    <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>Logging Servlet</servlet-name>
    <url-pattern>/log4j/*</url-pattern>
</servlet-mapping>
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