Problem
Unable to create cache directory '/home/opengrok/4.2_r1/data/historycache/external/jmonkeyengine/engine/src/core/com/jme3/scene/debug'.
Unable to create cache directory '/home/opengrok/4.2_r1/data/historycache/external/jmonkeyengine/engine/src/core/com/jme3/scene/debug'.