struts2 tiles 模块异常花费了我一天的时间

最新推荐文章于 2019-07-25 03:45:38 发布

原创最新推荐文章于 2019-07-25 03:45:38 发布 · 1.7k 阅读

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#struts #tomcat

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本文介绍了Struts2框架中Tiles模块配置导致的NullPointerException异常及其解决办法。通过在web.xml中正确配置Tiles的参数和监听器，可以避免此异常并确保页面正常渲染。

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javax.servlet.ServletException: java.lang.NullPointerException
	org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:518)
	org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:421)

root cause

java.lang.NullPointerException
	org.apache.struts2.views.tiles.TilesResult.doExecute(TilesResult.java:104)
	org.apache.struts2.dispatcher.StrutsResultSupport.execute(StrutsResultSupport.java:178)
	com.opensymphony.xwork2.DefaultActionInvocation.executeResult(DefaultActionInvocation.java:343)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
	com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:213)
	com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86)
	com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:219)
	com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:218)
	com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:216)
	com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:150)
	org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:48)
	com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86)
	com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:219)
	com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:218)
	com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:216)
	com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:123)
	com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:219)
	com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:218)
	com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:216)
	com.opensymphony.xwork2.interceptor.ParametersInterceptor.intercept(ParametersInterceptor.java:161)
	com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:219)
	com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:218)
	com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)
	com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:216)
	com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:105)
	com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:219)
	com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:218)
	com.opensymphony.xwork2.util.profiling.UtilTimerStack.profile(UtilTimerStack.java:455)

原因：tomcat在加载web.xml文件 没有对tiles 的工厂实例化

解决一：在web.xml中添加：

	<context-param>
  		<param-name>
 		  org.apache.tiles.impl.BasicTilesContainer.DEFINITIONS_CONFIG
  		</param-name>
  		<param-value>/WEB-INF/tiles-defs.xml</param-value>
 	</context-param>
 <listener>
  <listener-class>
   org.apache.struts2.tiles.StrutsTilesListener
  </listener-class>
 </listener>

解决二：在web.xml添加

	<listener>
  		<listener-class>org.apache.struts2.tiles.StrutsTilesListener</listener-class>
	 </listener>
   
   	<context-param>
  		<param-name>definitions-config</param-name>
 		 <param-value>/WEB-INF/tiles-defs.xml</param-value>
	 </context-param>