过滤器链的GlassFish问题：java.lang.IllegalStateException：已为此响应调用了PWC

我们需要升级老式Web应用程序以在GlassFish 3而不是Tomcat下运行才能获得EAR部署(Glassfish被选中,因为它是参考JEE 6实现)

不幸的是,它很快证明了确保用户登录的机制不能正常工作并且抱怨已经调用了getWriter()(这很可能是正确的)并且我无法弄清楚原因.

方法是我们在完整的JSP文件集上有一个过滤器,用于检查用户是否已登录,如果没有,则使用filterChain.doFilter(servletRequest,servletResponse);重定向到登录页面.用户状态(包括凭证)存储在会话范围中的所谓控制器对象中,该范围是从登录验证java代码设置的.

来自Glassfish的堆栈跟踪：

java.lang.IllegalStateException: PWC3990: getWriter() has already been called for this response
    at org.apache.catalina.connector.Response.getOutputStream(Response.java:676)
    at org.apache.catalina.connector.ResponseFacade.getOutputStream(ResponseFacade.java:205)
    at org.apache.myfaces.webapp.filter.ExtensionsFilter.doFilter(ExtensionsFilter.java:176)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:215)
    at com.XXX.LoggedInToXXXFilter.doFilter(LoggedInToXXXFilter.java:61)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:215)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:277)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188)
....

web.xml片段

<?xml version="1.0"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<description>
    XXX provides a web interface for a given user.
</description>
<display-name>
XXX
</display-name>
<context-param>
    <param-name>javax.faces.CONFIG_FILES</param-name> 
    <param-value>/WEB-INF/online-faces-config.xml</param-value>
</context-param>
<context-param>
    <param-name>org.apache.myfaces.ALLOW_JAVASCRIPT</param-name>
    <param-value>true</param-value>
</context-param> 

<listener>
    <listener-class>
        org.apache.myfaces.webapp.StartupServletContextListener
    </listener-class>
</listener>
<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>*.jsf</url-pattern>
</servlet-mapping>

<session-config>
    <!-- idle time in minutes before user is automatically logged out by the container -->
    <session-timeout>30</session-timeout>
</session-config>
<welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<filter>
    <filter-name>MyFacesExtensionsFilter</filter-name>
    <filter-class>
        org.apache.myfaces.webapp.filter.ExtensionsFilter
    </filter-class>
    <init-param>
        <param-name>maxFileSize</param-name>
        <param-value>1m</param-value>
        <!-- description>Set the size limit for uploaded files.
            Format: 10 - 10 bytes
            10k - 10 KB
            10m - 10 MB
            1g - 1 GB
            </description-->
    </init-param>
</filter>

<!-- extension mapping for adding <script/>,<link/>,and other resource tags to JSF-pages  -->
<filter-mapping>
    <filter-name>MyFacesExtensionsFilter</filter-name>
    <!-- servlet-name must match the name of your javax.faces.webapp.FacesServlet entry -->
    <servlet-name>Faces Servlet</servlet-name>
</filter-mapping>

<!-- extension mapping for serving page-independent resources (javascript,stylesheets,images,etc.)  -->
<filter-mapping>
    <filter-name>MyFacesExtensionsFilter</filter-name>
    <url-pattern>/faces/myFacesExtensionResource/*</url-pattern>
</filter-mapping>

<filter>
    <description>Ensure user is logged in</description>
    <filter-name>LoggedInToXXXFilter</filter-name>
    <filter-class>
        com.XXX.servlet.filters.LoggedInToXXXFilter
    </filter-class>
    <init-param>
        <param-name>signon_page</param-name>
        <param-value>/login.jsf</param-value>
    </init-param>
    <init-param>
        <param-name>autologout_page</param-name>
        <param-value>/autologout.jsp</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>LoggedInToXXXFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>
<!-- filter>
    <filter-name>extensionsFilter</filter-name>
    <filter-class>org.apache.myfaces.component.html.util.ExtensionsFilter</filter-class>
    <init-param>
    <param-name>uploadMaxFileSize</param-name>
    <param-value>100m</param-value>
    </init-param>
    <init-param>
    <param-name>uploadThresholdSize</param-name>
    <param-value>100k</param-value>
    </init-param>
    </filter-->
<!-- filter-mapping>
    <filter-name>extensionsFilter</filter-name>
    <url-pattern>*.jsf</url-pattern>
    </filter-mapping>
    <filter-mapping>
    <filter-name>extensionsFilter</filter-name>
    <url-pattern>/faces/*</url-pattern>
    </filter-mapping-->
<!-- error-page>
    <exception-type>java.lang.IllegalArgumentException</exception-type>
    <location>/WEB-INF/jsp/IllegalArgumentException.jsp</location>
    </error-page-->
<error-page>
    <exception-type>java.lang.RuntimeException</exception-type>
    <location>/WEB-INF/jsp/RuntimeException.jsp</location>
</error-page>
<!-- error-page>
    <exception-type>com.transaxiom.axsWHSweb.struts.action.UserIsNotLoggedInException</exception-type>
    <location>/WEB-INF/jsp/UserIsNotLoggedInException.jsp</location>
    </error-page-->
<error-page>
    <exception-type>
        com.XXX.struts.action.SecurityViolationException
    </exception-type>
    <location>/WEB-INF/jsp/SecurityViolationException.jsp</location>
</error-page>
<error-page>
    <exception-type>
        com.XXX.logic.UncheckedCommunicationException
    </exception-type>
    <location>/WEB-INF/jsp/CommunicationException.jsp</location>
</error-page>
<error-page>
    <exception-type>
        com.XXX.logic.ConnectionNotCreatedException
    </exception-type>
    <location>
        /WEB-INF/jsp/ConnectionNotCreatedException.jsp
    </location>
</error-page>
<!-- error-page>
    <exception-type>com.XXX.logic.UncheckedConnectionNotCreatedException</exception-type>
    <location>/WEB-INF/jsp/ConnectionNotCreatedException.jsp</location>
    </error-page-->
<!-- filter>
    <filter-name>MyFacesExtensionsFilter</filter-name>
    <filter-class>org.apache.myfaces.component.html.util.ExtensionsFilter</filter-class>
    <init-param>
    <param-name>maxFileSize</param-name>
    <param-value>20m</param-value>
    </init-param>
    </filter>
    <filter-mapping>
    <filter-name>MyFacesExtensionsFilter</filter-name>
    <url-pattern>*.faces</url-pattern>
    </filter-mapping-->
</web-app>

从LoggedInToXXXFilter.java过滤代码：

（编辑：安卓应用网）

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