严重: Unable to instantiate ExpressionFactory 'com.sun.el.ExpressionFactoryImpl'
2007-12-13 15:00:08 org.apache.catalina.core.StandardContext listenerStart
严重: Exception sending context initialized event to listener instance of class

com.sun.faces.config.ConfigureListener
java.lang.IllegalStateException: No application context active
    at org.jboss.seam.Component.forName(Component.java:1799)
    at org.jboss.seam.Component.getInstance(Component.java:1849)
    at org.jboss.seam.Component.getInstance(Component.java:1844)
    at org.jboss.seam.Component.getInstance(Component.java:1821)
    at org.jboss.seam.Component.getInstance(Component.java:1816)
    at org.jboss.seam.core.ResourceLoader.instance(ResourceLoader.java:97)

此错误是因为缺少 el-ri-1.0.jar 包导致

修改myfaces使javax.faces.CONFIG_FILES可加载用通配符表示的xml

修改后可书写

  <context-param>
    <description/>
    <param-name>javax.faces.CONFIG_FILES</param-name>
    <param-value>/WEB-INF/faces-configs/*-config.xml</param-value>
  </context-param>
 
  思想来源于spring的Resource[]配置,这样增加一个config配置后不用更改web.xml
  如下实现
  要修改的地方org.apache.myfaces.config.FacesConfigurator类的
  feedContextSpecifiedConfig()方法
  实现主要使用了spring类中的ServletContextResourcePatternResolver
  传入一个通配符字符串然后得到一个Resource资源数组
 
private void feedContextSpecifiedConfig() throws IOException, SAXException{
 String configFiles = _externalContext.getInitParameter(FacesServlet.CONFIG_FILES_ATTR);
 if (configFiles != null)
 {
 StringTokenizer st = new StringTokenizer(configFiles, ",", false);
 while (st.hasMoreTokens())
 {
  String systemId = st.nextToken().trim();

 if (log.isWarnEnabled() && DEFAULT_FACES_CONFIG.equals(systemId))
 log.warn(DEFAULT_FACES_CONFIG + " has been specified in the " + FacesServlet.CONFIG_FILES_ATTR
                            + " context parameter of " + "the deployment descriptor. This should be removed, "
                            + "as it will be loaded twice.  See JSF spec 1.2, 10.1.3");
 ServletContext _servletContext = (ServletContext) _externalContext.getContext();
 
 ServletContextResourcePatternResolver servletContextResourcePatternResolver =
 new ServletContextResourcePatternResolver(_servletContext);
 Resource[] resources =  servletContextResourcePatternResolver.getResources(systemId);
 for(int i=0;i<resources.length;i++){
                 Resource resource = resources[i];
                    //InputStream stream = _externalContext.getResourceAsStream(systemId);
                 InputStream stream = resource.getInputStream();
                    if (stream == null)
                    {
                        log.error("Faces config resource " + systemId + " not found");
                        continue;
                    }

                    if (log.isInfoEnabled())
                        log.info("Reading config " + systemId);
                    getDispenser().feed(getUnmarshaller().getFacesConfig(stream, systemId));
                    stream.close();
     }
               

   }
  }
 }

private final ExternalContext _externalContext; 

ServletContext _servletContext =

(ServletContext) _externalContext.getContext();

Error initializing MyFaces: java.net.ConnectException: Connection timed out: connect

myfaces1.2.0试图链接网络下载

URL http://java.sun.com/dtd/web-facesconfig_1_1.dtd

和URL http://java.sun.com/dtd/web-facesconfig_1_0.dtd 

,但是网络连接不上

解决办法手动下载URL http://java.sun.com/dtd/web-facesconfig_1_1.dtd 

和URL http://java.sun.com/dtd/web-facesconfig_1_0.dtd 

并把dtd文件放入myfaces-impl-1.2.0.jar中的 org/apache/myfaces/resource/ 目录

参考

myfaces-impl-jar-does-not-include-faces-config-dtds-and-thus-won't-work-if-offline