loader constraint violation in maven plugin project

[Peter Nabbefeld <pe...@gmx.de>]

Hello,

in a maven plugin project, I get the following LinkageError in 
JavaTreeBuilder:

"loader constraint violation: loader (instance of 
org/netbeans/StandardModule$OneModuleClassLoader) previously initiated 
loading for a different type with name "javax/lang/model/util/Elements""

My guess is, the class has already been loaded as part of NetBeans, and 
it is loaded a second time when executing the plugin.

The project is at github 
(https://github.com/OldGrumble/NBWicketSupport), for testing I'm using 
branch "issue-2".

I added some extra lines to JavaTreeBuilder.java for easier error 
catching, You can set a breakpoint in line 139 of JavaTreeBuilder for 
looking at the exception.

The demo project I'm using is added to the branch in 
src/main/resources/demo.

Workflow:
1. Open Project.
2. Open CustomerTestPage.java.
3. Open CustomerTestPage.html.
4. An exception dialog pops up ("Unexpected Exception").

Probably it's important: Using NB 8.2 with JDK 1.8 on Linux.

Any help appreciated.

Kind regards

Peter

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