无法确定拦截器在Struts2中是否正常工作

Question

I have configured struts.xml file as follows :

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
   "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
   "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
   <constant name="struts.devMode" value="true" />
   <package name="helloworld" extends="struts-default">

      <action name="hello" 
            class="com.struts2examples.HelloWorldAction" 
            method="execute">
            <result name="success">/HelloWorld.jsp</result>
            <result name="error">/AccessDenied.jsp</result>
            <interceptor-ref name="params"/>
            <interceptor-ref name="timer" />
      </action>
   </package>
</struts>

It should log the time of execution action hello . When I am calling the hello action on server, Logs get generated in tomcat logs as :

0:0:0:0:0:0:0:1 - - [18/Nov/2013:17:24:38 +0530] "GET /StrutsHelloWorld/Login.jsp HTTP/1.1" 404 1033
0:0:0:0:0:0:0:1 - - [18/Nov/2013:17:29:30 +0530] "POST /Struts2HelloWorld/hello HTTP/1.1" 200 129
0:0:0:0:0:0:0:1 - - [18/Nov/2013:17:29:41 +0530] "POST /Struts2HelloWorld/hello HTTP/1.1" 200 105
0:0:0:0:0:0:0:1 - - [18/Nov/2013:17:31:04 +0530] "POST /Struts2HelloWorld/hello HTTP/1.1" 200 105

Nowhere the interceptor logs are shown. I am accessing the localhost_access_log.2013-11-18.txt file in tomcat logs. Am I accessing the wrong file? If it is then where would be the logs generated?

Answer 1

You didn't specified which library you are using (eg. Log4j), nor how it's configured, but you should look inside your log file, not in tomcat one.

From the documentation :

This interceptor logs the amount of time in milliseconds. In order for this interceptor to work properly, the logging framework must be set to at least the INFO level. This interceptor relies on the Commons Logging API to report its execution-time value .

Parameters

• logLevel (optional) - what log level should we use (trace, debug, info, warn, error, fatal)? - defaut is info

• logCategory (optional) - If provided we would use this category (eg. com.mycompany.app). Default is to use com.opensymphony.xwork2.interceptor.TimerInterceptor .

The parameters above enables us to log all action execution times in our own logfile .

That said, you are using only TWO interceptors; it would be better to add the Timer Interceptor to the defaultStack or at least to the basicStack (or to a custom stack of your). Putting it after the stack will log only Action's execution time, while before the stack will log Interceptors's execution time too:

Log only Action's execution time:

<action name="hello" class="com.struts2examples.HelloWorldAction">
    <interceptor-ref name="defaultStack"/>
    <interceptor-ref name="timer" />
    <result>/HelloWorld.jsp</result>
    <result name="error">/AccessDenied.jsp</result>
</action>

Log Action's and Interceptor's execution time:

<action name="hello" class="com.struts2examples.HelloWorldAction">
    <interceptor-ref name="timer" />
    <interceptor-ref name="defaultStack"/>
    <result>/HelloWorld.jsp</result>
    <result name="error">/AccessDenied.jsp</result>
</action>

Note that method="execute" or result name="success" are not necessary because they're the default.