Merge pull request #448 from Dokthar/hoveringtank

fix NPE in hovering tank test, running with native bullet

jme3-examples/src/main/java/jme3test/bullet/PhysicsHoverControl.java

@@ -192,6 +192,7 @@ public class PhysicsHoverControl extends PhysicsVehicle implements PhysicsContro
     }
 
     public void setPhysicsSpace(PhysicsSpace space) {
+        createVehicle(space);
         if (space == null) {
             if (this.space != null) {
                 this.space.removeCollisionObject(this);

jme3-examples/src/main/java/jme3test/bullet/TestHoveringTank.java

@@ -147,13 +147,13 @@ public class TestHoveringTank extends SimpleApplication implements AnalogListene
         spaceCraft.setLocalRotation(new Quaternion(new float[]{0, 0.01f, 0}));
 
         hoverControl = new PhysicsHoverControl(colShape, 500);
-        hoverControl.setCollisionGroup(PhysicsCollisionObject.COLLISION_GROUP_02);
 
         spaceCraft.addControl(hoverControl);
 
 
         rootNode.attachChild(spaceCraft);
         getPhysicsSpace().add(hoverControl);
+        hoverControl.setCollisionGroup(PhysicsCollisionObject.COLLISION_GROUP_02);
 
         ChaseCamera chaseCam = new ChaseCamera(cam, inputManager);
         spaceCraft.addControl(chaseCam);