Re: [Webmacro-devel] Help! (AKA: I hate resin)

[Keats <ke...@ea...>]

I think I ran into a similar problem trying to run Ignition under
ServletExec.  I think the spec gives Servlet containers some leeway in how
they implement class loaders, and specifically in how they are chained.
However, returning a non-null if the resource wasn't found, sounds like it
could be a serious Resin bug.

If you are trying to load from WEB-INF/classes you obviously need to have a
Servlet-aware ClassLoader .  The good news is that you don't have to wait
for your first request to get the ServletContext -- you can get it during
the init() of your Servlet.

If you have a WM Broker instance around, you can call getResourceAsStream(),
or getResource(), on the Broker.  No need to reinvent the wheel.

Hope this helps.

Keats


----- Original Message -----
From: "Marc Palmer" <ma...@an...>
To: <web...@li...>
Sent: Tuesday, June 24, 2003 1:37 PM
Subject: [Webmacro-devel] Help! (AKA: I hate resin)


>
> Guys I'd appreciate a hand here -
>
> Ignition runs fine in Tomcat (for me) but won't start under Resin.
>
> The problem is that Ignition cannot load resources it requires, namely
> properties files, which are in WEB-INF/classes. This may also be the
> problem the problem Lane is experiencing with Tomcat on a unix box -
though
> we can't see why tomcat (or the VM) would vary on this on different
> platforms without breaking a lot of stuff.
>
> Here is an example of my code, which works perfectly under many versions
of
> Tomcat:
>
>     public PropertiesIgnitionVersionInfo()
>     {
>         Properties p = new Properties();
>         try
>         {
>             p.load( getClass().getResourceAsStream(
"/version.properties") )
> ;
>         }
>         catch (IOException e)
>         {
>             throw new RuntimeException(
>                     "Unable to load version info from classpath:
> "+RESOURCE_VERSIONINFO);
>         }
>         major = Integer.parseInt( p.getProperty(PROPERTY_MAJORVERSION));
>         minor = Integer.parseInt( p.getProperty(PROPERTY_MINORVERSION));
>         buildDate = p.getProperty(PROPERTY_BUILD_DATE);
>         buildName = p.getProperty(PROPERTY_BUILD_NAME);
>     }
>
> Now here's the thing. Under resin this fails not because
> getResourceAsStream returns null - because it doesn't.
>
> Resin returns a valid InputStream pointing to ... ? nothing it seems. The
> Properties is empty after the call to load.
>
> Then the parseInt calls die because the property is null.
>
> Yes I have tried with/without the "/". "/" is the correct thing to do, and
> both cases produce the same results in Resin.
>
> Now I think I have tracked down the problem. Resin is probably using a
> classloader that does not defer to the classloader used to load the webapp
> resources.
>
> Stay with me here... in the .WAR the code shown above lives in WEB-
> INF/lib/ignition-core.jar but the version.properties file lives in WEB-
> INF/classes.
>
> As a result getClass() is using the classloader used to load the JAR, and
> in Resin this means it cannot find anything in WEB-INF/classes - and
> erroneously creates an empty input stream instead of null.
>
> Anyway, the solution to this seems to be to use either the ServletContext
> classloader and/or the Servlet classloader to call getResourceAsStream.
>
> This is not very nice as it means passing ClassLoaders around but is not
> the end of the world.
>
> It just baffles me that Resin is so "bad" like this, but then I suppose I
> am doing something a little weird because the files are in different
> locations.
>
> Using ServletContext.getResource is not an option because we're not in a
> request yet... and prefixing with WEB-INF/classes would be nasty :)
>
> Any thoughts gratefully received.
>
> --
> Marc Palmer
> Contract Java Consultant/Developer
>
> http://www.anyware.co.uk/marc/
> http://www.wangjammers.org
>
>
>
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