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

[Marius Bogoevici]

On 12-03-02 11:20 AM, Lincoln Baxter, III wrote:
> 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.
I think that this can be generalized by a) using provider's CL as the 
TCCL; b) ensuring that providers get the CL of scaffold-impl as a 
dependency when they're loaded.
>
> https://issues.jboss.org/browse/FORGE-487
>
> ~Lincoln
>
> On Fri, Mar 2, 2012 at 10:43 AM, Ryan Bradley <rbradley at redhat.com 
> <mailto: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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