[forge-dev] AeroGear: unable to load JPA classes

[Lincoln Baxter, III]

This surprises me, since SpringProvider's ClassLoader should already be the
current classloader:

https://github.com/forge/core/blob/master/shell/src/main/java/org/jboss/forge/shell/command/Execution.java#L148

AHA! But since this is actually being executed from the ScaffoldPlugin,
which is BUILT IN, the classloader is actually still that of the
scaffold-impl (ScaffoldPlugin) - Ok. This means that we need an internal
utility to wrap external invocations in a new TCCL.

https://issues.jboss.org/browse/FORGE-487

~Lincoln

On Fri, Mar 2, 2012 at 10:43 AM, Ryan Bradley <rbradley at redhat.com> wrote:

> On 03/02/2012 01:12 AM, Richard Kennard wrote:
> > 5. Class loading: getClass().getResourceAsStream() works differently
> depending on which JAR the class was loaded from. So for example the
> > getClass().getResourceAsStream() that lives inside metawidget.jar
> couldn't see the resources that were declared in my plugin.jar
> Richard,
>
> I've experienced this ClassLoader problem with my plugin as well.  The
> solution thus far has been to force the current thread to use of the
> ScaffoldProvider's ClassLoader in the generateFromEntity() method.  That
> is, save the current thread's ClassLoader at the beginning of the
> method, encapsulate the rest of the method in a try block (changing the
> thread's class loader to that of the ScaffoldProvider), and add a
> finally block which restores the original class loader.
>
> The code can be found here:
>
> https://github.com/forge/plugin-spring-mvc/blob/master/src/main/java/org/jboss/forge/scaffold/spring/SpringScaffold.java
>
> Cheers,
> Ryan
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>



-- 
Lincoln Baxter, III
http://ocpsoft.com
http://scrumshark.com
"Keep it Simple"
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