Redirecting to a page from a MethodAdvice implementation

[Davide Vecchi]

Hello,
I have the following class to handle the execution of methods that are 
annotated with a custom @ExceptionDisplay annotation. Everything works as 
expected, but I would like to redirect to a page. I'm using 
PageRenderLinkSource and Response to do that. I inject them in the same way I 
usually inject them into pages, but in this case it does not work, because the 
PageRenderLinkSource and Response instances are both null. I imagine that's 
because they should be only injected into pages or components, so I'm wondering 
if / how is it possible to redirect to a page from a MethodAdvice. Thanks in 
advance for any possible suggestion.

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ExceptionDisplayWorker.java
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package tapestry.util.annotations;

import java.io.IOException;

import org.apache.tapestry5.Link;
import org.apache.tapestry5.ioc.annotations.Inject;
import org.apache.tapestry5.model.MutableComponentModel;
import org.apache.tapestry5.plastic.MethodAdvice;
import org.apache.tapestry5.plastic.MethodInvocation;
import org.apache.tapestry5.plastic.PlasticClass;
import org.apache.tapestry5.plastic.PlasticMethod;
import org.apache.tapestry5.services.PageRenderLinkSource;
import org.apache.tapestry5.services.Response;
import org.apache.tapestry5.services.transform.ComponentClassTransformWorker2;
import org.apache.tapestry5.services.transform.TransformationSupport;

import tapestry.pages.ExceptionDisplayPage;
import tapestry.annotations.ExceptionDisplay;

public class ExceptionDisplayWorker implements ComponentClassTransformWorker2
{
       private final MethodAdvice advice = new MethodAdvice()
        {
              @Inject
              private PageRenderLinkSource pageRenderLinkSource;

              @Inject
              private Response             response;

            @Override
            public void advise(MethodInvocation invocation)
            {
                System.out.println(this.pageRenderLinkSource + ";" + 
this.response); // Both null.

                MethodInvocation result = invocation.proceed();

                if (result.didThrowCheckedException())
                {
                     Exception exception = 
result.getCheckedException(Exception.class);

                     exception.printStackTrace();

                     // Redirect to the exception page :

                     result.setCheckedException(null);

                     Link exceptionDisplayPage = 
this.pageRenderLinkSource.createPageRenderLink(ExceptionDisplayPage.class); // 
Problem here, pageRenderLinkSource is null.

                     try
                    {
                           this.response.sendRedirect(exceptionDisplayPage); // 
Problem here too, response is null too.

                    }
                    catch (IOException e)
                    {
                           e.printStackTrace();
                    }
                }
            }
        };

       @Override
       public void transform(PlasticClass plasticClass, TransformationSupport 
support, MutableComponentModel model)
       {
              for (PlasticMethod method : 
plasticClass.getMethodsWithAnnotation(ExceptionDisplay.class))
              {
                     method.addAdvice(this.advice);
              }
       }
}


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