Exception Interceptor Throws Advice

[nazzy khan]

Hi,

I have created a throws advice for my command bean (Login.java) for handling exception and logging when exception is thrown from my command.

Call
LoginAction -> Login command

Both action and command is defined in ApplicationContext.xml file as below

   <bean name="/login" class="com.xyz.LoginAction"> ---------------- Action
      <property name="modelCommand">
         <ref bean="Login"/>
      </property>
  </bean>

  <bean id="Login" class="com.xyz.Login">     ---------------------- Command
  </bean>

  <!-- interceptor details -->
  <bean id="exceptionAspect" class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator" >
       <property name="beanNames">
               <list>
                      <value>Login</value>      ------------------- Login Command to Aspect
               </list>
       </property>
       <property name="interceptorNames">
               <value>exceptionAdvisor</value>
       </property>
 </bean>

 <bean id="exceptionAdvisor" class="org.springframework.aop.support.RegexpMethodPointcutAdvisor">
       <property name="advice">
               <ref local="exceptionInterceptor" />
       </property>
       <property name="patterns">
               <list>
                 <value>.*</value>
               </list>
       </property>
 </bean>


<bean id="exceptionInterceptor" class="com.xyz.ExceptionInterceptor">     --------------- Interceptor
 </bean>

When an exception is thrown from my command, my interceptor class (com.xyz.ExceptionInterceptor.java) will be called. I'm throwing NullPointerException from command. I want the exact line of the command class from where exception is thrown.

ex.getClass().getName() prints only "java.lang.NullPointerException"but not the line no.


code below:

[b]Login.java[/b]

package com.xyz;
public class Login {  

   public Object doExecute() {
	   System.out.println("Login:doExecute()->start****************************************");
	   
	   String str = null;
	   str.toString();       // manually throwing NullPointerException 
	   System.out.println("Login:doExecute()->end****************************************");
	   return null;
   }

}

[b]ExceptionInterceptor.java[/b]

package com.xyz;
import java.lang.reflect.Method;
import org.springframework.aop.ThrowsAdvice;

public class ExceptionInterceptor implements ThrowsAdvice {
	
        public void afterThrowing(Method method, Object[] args, Object target,
			Exception ex) throws Throwable {		
		    System.out.println("***");
		    System.out.println("Exception Capture");
		    System.out.println("Caught: " + ex.getClass().getName());
                                    System.out.println("Class: " + target.getClass().getName());
		    System.out.println("Method: " + method.getName());
		    System.out.println("***\n");
	    }
}

prints
Caught: java.lang.NullPointerException
Class: Login
Method: doExecute

How do I get the line no in ExceptionInterceptor class?


-nazzy

[nazzy khan]

Sorry my bad.. It was very easy.

I have not tried printStackTrace()

getMessage returned null.. then I thought printStackTrace() will also not work.


printStackTrace() returns the complete stack trace along with the line where exception is thrown.


Thanks

-nazzy