Servlet.init() for servlet action threw exception 异常解决办法

Tomcat异常解析

最新推荐文章于 2022-11-17 11:52:10 发布

原创最新推荐文章于 2022-11-17 11:52:10 发布 · 6.4w 阅读

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本文解析了Tomcat中因Struts配置文件缺失导致的NullPointerException异常，提供了详细的错误堆栈跟踪及解决思路。

tomcat 经常会报一些莫名其妙的异常：如下

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Servlet.init() for servlet action threw exception
	org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
	org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
	org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
	org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
	org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
	org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
	org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
	java.lang.Thread.run(Thread.java:595)

root cause

java.lang.NullPointerException
	org.apache.struts.action.ActionServlet.parseModuleConfigFile(ActionServlet.java:1003)
	org.apache.struts.action.ActionServlet.initModuleConfig(ActionServlet.java:955)
	org.apache.struts.action.ActionServlet.init(ActionServlet.java:482)
	com.dc.idm.ui.action.init.InitServlet.init(InitServlet.java:68)
	javax.servlet.GenericServlet.init(GenericServlet.java:211)
	org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
	org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
	org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
	org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
	org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
	org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
	org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
	java.lang.Thread.run(Thread.java:595)

note The full stack trace of the root cause is available in the Apache Tomcat/5.5.20 logs.

这个问题主要是由于配置文件对应不上造成的，也就是说你的web.xml文件中关于struts的配置说明( struts -[*-config.xml])在指定的目录下没找到造成的，如：

<init-param>
            <param-name>config/console/workflow</param-name>
            <param-value>
                /WEB-INF/struts-conf/struts-flow.xml
            </param-value>
        </init-param>

而在 /WEB-INF/struts-conf/struts-flow.xml 下并没有找到 struts-flow.xml文件，此时，就会报这个错！！请校正~