Question

我正在尝试创建一个struts2应用程序。我已经设置了spring，struts和web xml文件。当我省略过滤器＆＃34; StrutsPrepareAndExecuteFilter＆＃34;时，它会部署到tomcat服务器，但当我转到jsp时，其中包含任何类型的struts标记，我收到以下错误。

这是堆栈跟踪：

Servlet.service() for servlet [jsp] in context with path [] threw exception [An

exception occurred processing JSP page /index.jsp at line 259



Stacktrace:] with root cause
The Struts dispatcher cannot be found.  This is usually caused by using Struts tags without the associated filter. Struts tags are only usable when the request has passed through its servlet filter, which initializes the Struts dispatcher needed for this tag. - [unknown location]
    at org.apache.struts2.views.jsp.TagUtils.getStack(TagUtils.java:60)
    at org.apache.struts2.views.jsp.StrutsBodyTagSupport.getStack(StrutsBodyTagSupport.java:44)
    at org.apache.struts2.views.jsp.ComponentTagSupport.doStartTag(ComponentTagSupport.java:48)
    at org.apache.jsp.index_jsp._jspx_meth_s_005furl_005f0(index_jsp.java:638)
    at org.apache.jsp.index_jsp._jspService(index_jsp.java:320)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run

然后，当我将过滤器放回我的web.xml文件中时，服务器甚至无法部署。当我使用过滤器重新启动服务器时，我得到了这个：

Connected to server
[2015-07-29 07:55:21,077] Artifact Admin:war exploded: Artifact is being deployed, please wait...
log4j:WARN No appenders could be found for logger (com.opensymphony.xwork2.util.fs.DefaultFileManagerFactory).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Jul 29, 2015 7:55:27 PM org.apache.catalina.core.StandardContext startInternal
SEVERE: Error filterStart
Jul 29, 2015 7:55:27 PM org.apache.catalina.core.StandardContext startInternal
SEVERE: Context [] startup failed due to previous errors
Jul 29, 2015 7:55:27 PM org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc
SEVERE: The web application [] registered the JDBC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped. To prevent a memory leak, the JDBC Driver has been forcibly unregistered.
[2015-07-29 07:55:27,837] Artifact Admin:war exploded: Error during artifact deployment. See server log for details.
Jul 29, 2015 7:55:30 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory /java/apache-tomcat-7.0.47/webapps/manager
Jul 29, 2015 7:55:31 PM org.apache.catalina.loader.WebappClassLoader loadClass
INFO: Illegal access: this web application instance has been stopped already.  Could not load org.apache.tomcat.jdbc.pool.FairBlockingQueue$FairIterator.  The eventual following stack trace is caused by an error thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access, and has no functional impact.
java.lang.IllegalStateException
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1588)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1547)
    at org.apache.tomcat.jdbc.pool.FairBlockingQueue.iterator(FairBlockingQueue.java:233)
    at org.apache.tomcat.jdbc.pool.ConnectionPool.checkIdle(ConnectionPool.java:989)
    at org.apache.tomcat.jdbc.pool.ConnectionPool.checkIdle(ConnectionPool.java:981)
    at org.apache.tomcat.jdbc.pool.ConnectionPool$PoolCleaner.run(ConnectionPool.java:1348)
    at java.util.TimerThread.mainLoop(Timer.java:555)
    at java.util.TimerThread.run(Timer.java:505)

Exception in thread "PoolCleaner[2142566374:1438221326908]" java.lang.NoClassDefFoundError: org/apache/tomcat/jdbc/pool/FairBlockingQueue$FairIterator
    at org.apache.tomcat.jdbc.pool.FairBlockingQueue.iterator(FairBlockingQueue.java:233)
    at org.apache.tomcat.jdbc.pool.ConnectionPool.checkIdle(ConnectionPool.java:989)
    at org.apache.tomcat.jdbc.pool.ConnectionPool.checkIdle(ConnectionPool.java:981)
    at org.apache.tomcat.jdbc.pool.ConnectionPool$PoolCleaner.run(ConnectionPool.java:1348)
    at java.util.TimerThread.mainLoop(Timer.java:555)
    at java.util.TimerThread.run(Timer.java:505)
Caused by: java.lang.ClassNotFoundException: org.apache.tomcat.jdbc.pool.FairBlockingQueue$FairIterator
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1702)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1547)
    ... 6 more

这是我的web.xml文件：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
          http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         version="3.0">

  <!--Spring Configuration -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:/spring.xml,</param-value>
  </context-param>

  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>

  <listener>
    <listener-class>com.howe.listener.InitContextListener</listener-class>
  </listener>

  <filter>
    <filter-name>xssFilter</filter-name>
    <filter-class>com.howe.Filter.XssFilter</filter-class>
  </filter>

  <filter-mapping>
    <filter-name>xssFilter</filter-name>
    <url-pattern>*.jsp</url-pattern>
  </filter-mapping>
  <filter-mapping>
    <filter-name>xssFilter</filter-name>
    <url-pattern>*.do</url-pattern>
  </filter-mapping>

  <filter>
    <filter-name>struts2</filter-name>
    <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    <init-param>
      <param-name>actionPackages</param-name>
      <param-value>com.howe.Action</param-value>
    </init-param>
  </filter>

  <filter-mapping>
    <filter-name>struts2</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <welcome-file-list>
    <welcome-file>login.jsp</welcome-file>
  </welcome-file-list>

  <error-page>
    <error-code>400</error-code>
    <location>/error.jsp</location>
  </error-page>
  <error-page>
    <error-code>404</error-code>
    <location>/error.jsp</location>
  </error-page>
  <error-page>
    <error-code>500</error-code>
    <location>/error.jsp</location>
  </error-page>
  <error-page>
    <error-code>503</error-code>
    <location>/error.jsp</location>
  </error-page>
  <error-page>
    <error-code>504</error-code>
    <location>/error.jsp</location>
  </error-page>
  <error-page>
    <exception-type>java.lang.Throwable</exception-type>
    <location>/error.jsp</location>
  </error-page>

</web-app>

有人可以帮帮我吗？它可能是我项目中罐子的版本吗？

这是我的lib文件夹：

Answer 1

如this answer中所述，Tomcat JDBC池已在Tomcat 7.0.19中引入。

由于您没有指定您正在使用的Tomcat版本，因此

如果Tomcat < 7.0.19 ：您需要将tomcat-jdbc.jar放在Tomcat共享/lib文件夹中，而不是放在您的ear / war lib文件夹中你在做什么;
如果是Tomcat >= 7.0.19 ，那个jar已经在服务器上了，你得到的是NoClassDefFoundError，因为你把它放在了耳/战中而且Tomcat没有知道选择哪一个（在服务器1和包之间）。

在这两种情况下，您需要将其从包中删除。

在Maven中，您可以通过将<scope>provided</scope>添加到服务器上已有的依赖项来实现。

Answer 2

Babel是对的.... xssFilter有一些我忘记添加的依赖项，并且在构造函数运行时启动它无法创建类。日志有点误导，但我想出来了！谢谢你们

IntelliJ Struts 2应用程序启动问题

2 个答案: