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RE: [equinox-dev] JSP support in the servlet bridge incubator project


I should be able to contribute what I have. How is it best to package it up for you ?


"Kaegi, Simon" <Simon.Kaegi@xxxxxxxxxx>
Sent by: equinox-dev-bounces@xxxxxxxxxxx

06/02/2006 01:27 AM

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"Equinox development mailing list" <equinox-dev@xxxxxxxxxxx>
RE: [equinox-dev] JSP support in the servlet bridge incubator project

Hi Richard,
Great post.
I found myself in agreement with most of your observations and your approach definitely sounds interesting.
For my part I've been experimenting with packaging so in particular I'm very curious to see the details of how you've handled tag libraries.
I think your work here sounds excellent and is very much in line with what's going on. There's been considerable interest in this problem so if you're willing to contribute your work here that would be appreciated and really help things get moving. The RSP-UI folk also alluded to similar work in their proposal so we might also have that as source for a final solution.
There's an enhancement request here (https://bugs.eclipse.org/bugs/show_bug.cgi?id=140430) to track this work. I can update it with a bit more information, as we now have the go ahead for using Jasper2, Commons EL, and Commons Logging. Before we can really get going in the incubator we still need approval for Servlet 2.4 and JSP 2.0 (hopefully not to long now). In the interim I can certainly post what I've got in terms of packaging so we can perhaps begin a discussion on how we might want to bundle this stuff.

From: equinox-dev-bounces@xxxxxxxxxxx [mailto:equinox-dev-bounces@xxxxxxxxxxx] On Behalf Of Richard Backhouse
Thursday, June 01, 2006 1:48 PM
[equinox-dev] JSP support in the servlet bridge incubator project

I have spent a little time investigating supporting JSPs within the server side OSGi incubator project. Having taken a look at what Harald Niesche had achieved with his JasperBundle I felt that instead of having to prefix all my JSP requests with "/jasper-jsp" it would be preferable to support JSP's just as requests for static resources are handled.

Here is what I have put together :

1.) Created a org.apache.jasper bundle containing the required Jasper jars to run the JSP Container (commons-el.jar, jasper-compiler.jar, jasper-compiler-jdt.jar and jasper-runtime.jar). This bundle is also a fragment bundle whose bundle host is org.eclipse.equinox.servlet.bridge.http bundle. This allows references to the Jasper classes to be made without having to add explicit imports to the org.eclipse.equinox.servlet.bridge.http manifest.

2.) In the org.eclipse.equinox.servlet.bridge.http bundle I created a JspEnabledProxyServlet class that extends the ProxyServlet class. Within this new class a single JSPServletRegistration object is created that wrappers the Jasper
org.apache.jasper.servlet.JspServlet. Also a specialized JspServletHtpContext class has been created to handle setting the correct resouce http context for the bundle that contains the JSP resource.

3.) In the org.eclipse.equinox.servlet.bridge.http bundle I created a JspEnabledResourceRegistration class that extends the existing ResourceRegistration class and overides the handleRequest method. When created it is passed a reference to the JSPServletRegistration object .When the  handleRequest method is called if the supplied alias has an extension identified as a JSP extension the JSPServletRegistration object is used to handle the request instead of the standard ResourceRegistration.

4) All of the above is enabled by making some slight modifications to some of the org.eclipse.equinox.servlet.bridge.http classes, specifically the Activator class and the ProxyServlet class. The ProxyServlet changes were simply changing some of the class attributes and methods to protected access. The change to the Activator class was to invoke the new JspEnabledProxyServlet instead of the standard ProxyServlet. The manifest for the org.eclipse.equinox.servlet.bridge.extensionbundle was also modified to filter the javax.servlet.jsp classes down from the running webcontainer.

So this works nicely for any JSP resources configure via the standard resources extension point but what if the JSP's reference Custom Tag Libraries ? The solution I have come up with allows Custom Tag Libraries to be created as standard OSGi bundles. They register their provided TLD's via a TldProvider service I added to the org.eclipse.equinox.http.registry bundle. The JspEnabledProxyServlet class tracks the registered services and adds their  TLD uri's to the Jasper JSP Servlet. via an extended URLClassloader  I could have achieved the registration of the TLDProviders by using a new extension point added to the org.eclipse.equinox.http.registry bundle but getting access to the registry details seemed as though it would be quite hard to achieve in simple manor.

Thoughts ?

Richard Backhouse

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