Physics Body Editor error - libgdx

Question

I get this error when trying to initialize BodyEditorLoader from this library http://www.aurelienribon.com/blog/projects/physics-body-editor/
Exception in thread "LWJGL Application" com.badlogic.gdx.utils.GdxRuntimeException: java.lang.UnsatisfiedLinkError: com.badlogic.gdx.physics.box2d.PolygonShape.newPolygonShape()J
at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:127)
Caused by: java.lang.UnsatisfiedLinkError: com.badlogic.gdx.physics.box2d.PolygonShape.newPolygonShape()J
at com.badlogic.gdx.physics.box2d.PolygonShape.newPolygonShape(Native Method)
at com.badlogic.gdx.physics.box2d.PolygonShape.<init>(PolygonShape.java:29)
at aurelienribon.bodyeditor.BodyEditorLoader.<init>(BodyEditorLoader.java:31)
How can i fix it?

Answer 1

to see the code where it is called, but I venture to say that the problem is the call to your world this must be called before here's an example:
This a example compile good:
oWorld = new World(gravedad, dormir);
loader = new BodyEditorLoaderNewW(
Gdx.files.internal("data/test.json"));
This a example not compile good:
loader = new BodyEditorLoaderNewW(
Gdx.files.internal("data/test.json"));
oWorld = new World(gravedad, dormir);
recive this:
java.lang.UnsatisfiedLinkError:
com.badlogic.gdx.physics.box2d.PolygonShape.newPolygonShape () J
note the difference in the world is called one after so gives:
it is possible that in the future can, need this:
BodyEditorLoader - noSuchMethod
but if this is not the solution you could put some of the code, I hope you help

Answer 2

Based on this https://github.com/libgdx/libgdx/issues/2393 the problem is because natives aren't loaded before creating shape.
There are two solutions:
First is creating World instance before creating any shapes.
Second is calling Box2D.init(); before creating any shapes. This method is preferred because you don't need to create World instance and it's much more obvious.
Use this version https://gist.github.com/grulg/8691e7ee7709367ce165 instead of version from Google Code.