java.lang.NullPointerException at org.jivesoftware.openfire.admin.decorators.main_jsp._jspService(m

詳情參見

http://blog.csdn.net/qiaoidea/article/details/25739349  openfire插件開發（plugin sevlet）入門 （文章末尾）

有時候在添加AuthCheckFilter.addExclude()後雖然沒有跳轉到登錄驗證了，但是若果沒有登錄過（session記錄下管理控制檯驗證），會出現空指針現象：

異常：

java.lang.NullPointerException
	at org.jivesoftware.openfire.admin.decorators.main_jsp._jspService(main_jsp.java:195)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:547)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:480)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:520)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:227)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:941)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:409)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:186)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:875)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)
	at org.eclipse.jetty.server.Dispatcher.include(Dispatcher.java:195)
	at com.opensymphony.module.sitemesh.filter.PageFilter.applyDecorator(PageFilter.java:156)
	at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:59)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1330)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:478)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:520)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:227)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:941)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:409)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:186)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:875)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)
	at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:250)
	at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:149)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:110)
	at org.eclipse.jetty.server.Server.handle(Server.java:349)
	at org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:441)
	at org.eclipse.jetty.server.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:919)
	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:582)
	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:218)
	at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:51)
	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:586)
	at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:44)
	at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:598)
	at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:533)
	at java.lang.Thread.run(Unknown Source)

而如果我們先在管理控制檯登錄一次就可以正常跳轉了，這怎麼解決呢？！

解決方案：

插件的頁面不使用openfire控制檯的頁面框架（同樣適用於NullPointException異常解決）

安裝版的openfire的話，修改/openfire/plugins/admin/webapp/WEB-INF/decorators.xml文件

源代碼版的，要修改/openfire_src/src/web/WEB-INF/decorators.xml文件

示例：

<excludes>
    <pattern>/plugins/test/*</pattern>
    <pattern>/setup/setup-completed.jsp*</pattern>
    <pattern>/setup/setup-ldap-server_test.jsp*</pattern>
    <pattern>/setup/setup-ldap-user_test.jsp*</pattern>
    <pattern>/setup/setup-ldap-group_test.jsp*</pattern>
    <pattern>/setup/setup-clearspace-integration_test.jsp*</pattern>
    <pattern>/setup/setup-admin-settings_test.jsp*</pattern>
    <pattern>/login.jsp*</pattern>
    <pattern>/plugin-icon.jsp*</pattern>
    <pattern>/js/jscalendar/i18n.jsp*</pattern>
</excludes>

這樣，插件popplugin目錄下的所有路徑的jsp頁面及js，css等，都能被自由的訪問了。