For every kernel, the plug-in tries to run Python code, which could fail if language is not Python

Hi loghijiaha,

I'm debugging the plug-in just to have one final look at the code as we are near the end of GSoC.

While doing so, I found what seems to be a bug.

My job has several build steps, one for JS, one for Python, etc. The one for JS triggers the following pre-command, which I think is being used to change the working directory.

import os
os.chdir('/home/kinow/Development/java/jenkins/machine-learning-plugin/work/workspace/e2e-1') 

That results in an error, that is logged as "ERROR'. I tested using `%%python` in a notebook cell, while using the same javascript kernel, but it still failed to run. This command only works when I select the Python kernel.

I wonder if there is no way to tell Zeppelin what is the working directory we want to use, before starting the kernel?