Interceptor is not getting called

[tyte kyat]

Hi, I am trying to learn Login/Logout using Interceptor and my interceptor is not getting called.

- Parsing configuration file [struts-default.xml]
- Unable to locate configuration files of the name struts-plugin.xml, skipping
- Parsing configuration file [struts-plugin.xml]
- Parsing configuration file [struts.xml]
- Choosing bean (struts) for class com.opensymphony.xwork2.ObjectFactory
- Choosing bean (struts) for class com.opensymphony.xwork2.conversion.impl.XWorkConverter
- Choosing bean (struts) for interface com.opensymphony.xwork2.TextProvider
- Choosing bean (struts) for interface com.opensymphony.xwork2.ActionProxyFactory
- Choosing bean (struts) for interface com.opensymphony.xwork2.conversion.ObjectTypeDeterminer
- Choosing bean (struts) for interface org.apache.struts2.dispatcher.mapper.ActionMapper
- Choosing bean (jakarta) for interface org.apache.struts2.dispatcher.multipart.MultiPartRequest
- Choosing bean (struts) for class org.apache.struts2.views.freemarker.FreemarkerManager
- Choosing bean (struts) for interface org.apache.struts2.components.UrlRenderer
- Choosing bean (struts) for interface com.opensymphony.xwork2.validator.ActionValidatorManager
- Choosing bean (struts) for interface com.opensymphony.xwork2.util.ValueStackFactory
- Choosing bean (struts) for interface com.opensymphony.xwork2.util.reflection.ReflectionProvider
- Choosing bean (struts) for interface com.opensymphony.xwork2.util.reflection.ReflectionContextFactory
- Choosing bean (struts) for interface com.opensymphony.xwork2.util.PatternMatcher
- Choosing bean (struts) for interface org.apache.struts2.dispatcher.StaticContentLoader
- Choosing bean (struts) for interface com.opensymphony.xwork2.UnknownHandlerManager
- Overriding property devMode - old value: true new value: false
- Unable to load config class com.myauk.interceptor.LogInterceptor at interceptor - file:/C:/Users/monkey/Desktop/myworkspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/LoginInterceptorTest2/WEB-INF/classes/struts.xml:10:86 probably due to a missing jar, which might be fine if you never plan to use the loginInterceptor interceptor
- Actual exception
Caught Exception while registering Interceptor class com.myauk.interceptor.LogInterceptor - interceptor - file:/C:/Users/monkey/Desktop/myworkspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/LoginInterceptorTest2/WEB-INF/classes/struts.xml:10:86
	at org.apache.struts2.impl.StrutsObjectFactory.buildInterceptor(StrutsObjectFactory.java:77)
	at com.opensymphony.xwork2.config.providers.InterceptorBuilder.constructInterceptorReference(InterceptorBuilder.java:70)
	at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.lookupInterceptorReference(XmlConfigurationProvider.java:998)
	at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadInterceptorStack(XmlConfigurationProvider.java:817)
	at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadInterceptorStacks(XmlConfigurationProvider.java:830)
	at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadInterceptors(XmlConfigurationProvider.java:853)
	at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addPackage(XmlConfigurationProvider.java:460)
	at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadPackages(XmlConfigurationProvider.java:275)
	at org.apache.struts2.config.StrutsXmlConfigurationProvider.loadPackages(StrutsXmlConfigurationProvider.java:112)
	at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:204)
	at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:66)
	at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:390)
	at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:436)
	at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:195)
	at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:277)
	at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:258)
	at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:382)
	at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:103)
	at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4638)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5294)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1566)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1556)
	at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
	at java.util.concurrent.FutureTask.run(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: com.myauk.interceptor.LogInterceptor
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1701)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1546)
	at com.opensymphony.xwork2.util.ClassLoaderUtil.loadClass(ClassLoaderUtil.java:157)
	at com.opensymphony.xwork2.ObjectFactory.getClassInstance(ObjectFactory.java:107)
	at com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:160)
	at com.opensymphony.xwork2.ObjectFactory.buildBean(ObjectFactory.java:150)
	at org.apache.struts2.impl.StrutsObjectFactory.buildInterceptor(StrutsObjectFactory.java:52)
	... 27 more

struts.xml file is as followed

<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>
	<constant name="devMode" value="true"></constant>
	<package name="default" extends="struts-default">
	
		<interceptors>
			<interceptor name="loginInterceptor" class="com.myauk.interceptor.LogInterceptor"></interceptor>
			<interceptor-stack name="loginStack">
				<interceptor-ref name="loginInterceptor"></interceptor-ref>
				<interceptor-ref name="defaultStack"></interceptor-ref>
			</interceptor-stack>			
		</interceptors>
		
		<default-interceptor-ref name="loginStack"></default-interceptor-ref>
		
			
		<action name="loginAuthenticaion" class="com.myauk.action.LoginAction">			
			<result name="login-success">/welcome.jsp</result>
			<result name="input">/Login.jsp</result>
		</action>
		
		<action name="logout" class="com.myauk.action.LogoutAction">
			<result name="logout">/Login.jsp</result>
		</action>
		
	</package>
</struts>

This is my LoginInterceptor.java file

package com.myauk.interceptor;

import javax.servlet.http.HttpServletRequest;  
import javax.servlet.http.HttpSession;  
  
import org.apache.commons.lang.xwork.StringUtils;  
import org.apache.commons.logging.Log;  
import org.apache.commons.logging.LogFactory;  
import org.apache.struts2.StrutsStatics;  
  
import com.opensymphony.xwork2.ActionContext;  
import com.opensymphony.xwork2.ActionInvocation;  
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;  
  
public class LoginInterceptor extends AbstractInterceptor implements StrutsStatics {  
  
 
	private static final long serialVersionUID = 1L;
	private static final Log log = LogFactory.getLog(LoginInterceptor.class);  
	private static final String USER_HANDLE = "loggedInUser";  
	private static final String LOGIN_ATTEMPT = "loginAttempt";  
  
  
 public void init() {  
  System.out.println("Intializing LoginInterceptor");
  log.info("Intializing LoginInterceptor");  
 }  
  
 public void destroy() { 
	 System.out.println("i am in Destroy");
 }  
  
 public String intercept(ActionInvocation invocation) throws Exception {  
  
  final ActionContext context = invocation.getInvocationContext();  
  HttpServletRequest request = (HttpServletRequest) context  
    .get(HTTP_REQUEST);  
  HttpSession session = request.getSession(true);  
  
  // Is there a "user" object stored in the user's HttpSession?  
  Object user = session.getAttribute(USER_HANDLE);  
  if (user == null) {  
   // The user has not logged in yet.  
  
   // Is the user attempting to log in right now?  
   String loginAttempt = request.getParameter(LOGIN_ATTEMPT);  
  
   /* The user is attempting to log in. */  
   if (!StringUtils.isBlank(loginAttempt)) {  
    return invocation.invoke();  
   }  
   return "login";  
  } else {  
   return invocation.invoke();  
  }  
 }  
  
}  

any suggestion is appreciated!!! Or may be guding to a place where I can learn that will also be good. Thanks

[Mohana Rao Sv]

Everything is fine this is root cause Caused by: java.lang.ClassNotFoundException: com.myauk.interceptor.LogInterceptor make sure that your class is available there. Or else it's missing when building the application.