jconsole-plugin script demo does not work with nashorn

FULL PRODUCT VERSION :
openjdk version " 1.8.0-internal "
OpenJDK Runtime Environment (build 1.8.0-internal-andreas_2013_06_06_07_52-b00)
OpenJDK Server VM (build 25.0-b34, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
generic

A DESCRIPTION OF THE PROBLEM :
jconsole-plugin script demo does not work with nashorn.

I have prepared a patch which is similar to 8014519 : scriptpad sample does not work with nashorn.

jconsole-plugin has to other issues where i have a one line patch as well.
7023754 : Jconsole javascript plugin demo throws exception on window.print
7051182 : Regression: : jconsole scripting demo fails with UndeclaredThrowableException



REPRODUCIBILITY :
This bug can be reproduced always.