【发布时间】：2011-01-15 04:29:19
【问题描述】：
我们需要升级一个旧的 Web 应用程序以在 GlassFish 3 而不是 Tomcat 下运行，以便获得 EAR 部署（选择 Glassfish 是因为它是参考 JEE 6 实现）
不幸的是，很快发现确保用户登录的机制无法正常工作，并抱怨 getWriter() 已被调用（这很可能是正确的），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，它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（包括凭据）存储在会话范围内的所谓控制器对象中，该对象由登录验证 java 代码设置。
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 sn-p
<?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：
（堆栈跟踪发生在filterChain.doFilter(servletRequest, servletResponse) 行中。
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);
}
}
可能的原因是我们仍然自带 JSF 库（MyFaces 1.1.4 with Tomahawk）？
编辑：使用完整（但匿名）web.xml 更新问题。请注意，有很多注释掉的东西。我把它留了，以免不小心删除重要信息
编辑：试验了 sun-web-app 配置文件，发现它没有任何区别。有趣的是，登录后，登录页面抛出异常，但我可以手动导航到主页（也是 JSF）并看到另外两个功能正常的页面。除了登录页面之外还有三个页面会抛出异常。
我最初的想法是分离功能将是 t-taglib（用于 Tomahawk），但经过快速调查后似乎并非如此，因为一些工作页面使用 Tomahawk 而有些则没有。
编辑：比较两个 jsp 页面，一个失败，另一个没有显示任何明显的差异，这应该导致这种情况。正如有人指出的那样，已经报告了 Tomahawk 1.1 的这个错误并且我们使用的是 1.1.3，我现在已经升级到最新的 Apache Myfaces Tomahawk 1.1.9，它似乎已经解决了这个问题（没有 sun-网络应用程序）。
【问题讨论】：
-
您看到我对 sun-web-app 条目的编辑了吗？我今天没有时间做更多的实验，但我希望明天能得到一个明确的“THIS is the difference”。
标签： java tomcat servlets jakarta-ee glassfish