7
我們需要升級老年web應用程序運行在GlassFish 3而不是Tomcat爲了獲得EAR部署（ Glassfish被選爲參考JEE 6實現）GlassFish問題與過濾器鏈：java.lang.IllegalStateException：PWC3990：getWriter（）已被調用此響應
不幸的是，它很快證明，確保用戶登錄的機制無法正常工作，並且抱怨getWriter（）已經被調用（這是最有可能是正確的），我不明白爲什麼。
該方法是我們對整套JSP文件進行篩選，檢查用戶是否已登錄，如果沒有，則使用filterChain.doFilter(servletRequest, servletResponse);重定向到登錄頁面。用戶狀態（包括憑證）存儲在會話範圍內所謂的控制器對象中，該範圍由登錄驗證Java代碼設置。從Glassfish的
堆棧跟蹤：從LoggedInToXXXFilter.java
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)
....
的web.xml片斷
<?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>
過濾代碼：
（堆棧跟蹤發生在filterChain.doFilter(servletRequest, servletResponse)行。
public void doFilter(final ServletRequest servletRequest, final ServletResponse servletResponse,
final FilterChain filterChain) throws IOException, ServletException {
boolean ok = false;
if (servletRequest instanceof HttpServletRequest) {
HttpServletRequest request = (HttpServletRequest) servletRequest;
String servletPath = request.getServletPath();
if ((servletPath.equals(signOnPage) == true) || servletPath.endsWith(".css") || servletPath.equals(autologoutPage)) {
ok = true;
} else {
Controller controller = Controller.getControllerFromSession(request.getSession(false));
if ((controller != null) && controller.isSignedOn()) {
ok = true;
}
}
if (ok) {
filterChain.doFilter(servletRequest, servletResponse);
} else {
// Hop to the sign on page.
// http://forum.java.sun.com/thread.jspa?threadID=548967&messageID=2676856
ServletContext servletContext = filterConfig.getServletContext();
URL url = new URL(new URL(request.getRequestURL().toString()), (request.getContextPath() + signOnPage));
((HttpServletResponse) servletResponse).sendRedirect(url.toString());
}
} else {
// Only for http requests
filterChain.doFilter(servletRequest, servletResponse);
}
}
可能的原因是我們還帶着我們自己的JSF庫（MyFaces 1.1.4 with Tomahawk）？
編輯：用完整（但匿名）web.xml更新問題。請注意，有很多註釋掉的東西。我把它放在不小心刪除了重要的信息
編輯：嘗試用陽光web應用程序的配置文件，並發現它並沒有發揮作用。有趣的是，登錄後登錄頁面拋出異常，但我可以手動導航到主頁面（也是JSF），並看到兩個功能正常的頁面。除了引發異常的登錄頁面外，還有三個頁面。
我最初的想法是分離功能是t-taglib（對於Tomahawk），但經過快速調查似乎並非如此，因爲一些工作頁面使用了Tomahawk，有些則沒有。
編輯：比較兩個JSP的頁面，其中一個失敗了，另外一個它不沒有發現任何明顯的差別這應該引起這個。正如有人指出，有報道稱Tomahawk 1.1有這個bug，而且我們使用的是1.1.3，現在我已經升級到了最新的Apache Myfaces Tomahawk 1.1.9，這似乎解決了這個問題（沒有太陽 - 網絡應用程序）。
任何進展/更新？ – Bozho 2010-02-16 20:50:47
您看到我對sun-web-app條目的編輯了嗎？今天我還沒有時間進行更多的實驗，但我希望明天能明確「_THIS_是不同之處」。 – 2010-02-16 22:04:26