Struts 2 - How to redirect exceptions of type Exception to a particular page, but not handle a particular exception?

Question

I wish to redirect all errors of type Exception to the result \"error\". For that, I did this :

Answer 1

Use instanceof operator and rethrow desired exception from exception handler.

I managed it with an interceptor (here is what I used to try it out):

package com.kenmcwilliams.interceptor;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;
import java.util.logging.Level;
import java.util.logging.Logger;

public class Rethrower implements Interceptor{
    @Override
    public void destroy() {
    }

    @Override
    public void init() {
    }

    @Override
    public String intercept(ActionInvocation invocation){
        System.out.println("Start rethrower!");
        String result = "success";
        try {
            result = invocation.invoke();
        } catch (Exception ex) {
            Logger.getLogger(Rethrower.class.getName()).log(Level.SEVERE, null, ex);
        }
        Object exception = ActionContext.getContext().getValueStack().findValue("exception");
        if (exception instanceof RuntimeException){
            System.out.println("DOING RETHROW!");
            RuntimeException e = (RuntimeException)exception;
            throw e;
        }
        System.out.println("After rethrower!");
        return result;
    }
}

Here is the struts.xml (to save time looking up struts dtd):

    
    
    
        
            
            
                
                
            
        
        
            /WEB-INF/content/error.jsp
        
        
            
        
        
            
            /WEB-INF/content/bomb.jsp
        
    

Finally the action (it just throws a runtime exception):

package com.kenmcwilliams.kensocketchat.action;

import com.opensymphony.xwork2.ActionSupport;

public class Bomb extends ActionSupport{
    @Override
    public String execute() throws Exception{
        throw new RuntimeException();
    }
}