Message11517

Sorry for the delay in response. 

I tried the sample example given and it is working fine for both 2.5.3 and 2.7.0, but when it comes to add-on it is failing at the instantiation stage.

Did the console output with System.getProperties() and System.getenv() before initializing an object 
and compared both the outputs for 2.5.3 and 2.7.0 and found both the output's are same no change. 

--print option gives the following. 
$ jython --print
/sde/jdk/jdk1.8.0_45/bin/java -Xmx512m -Xss2560k -classpath ../../Applications/atlassian/jython/jython.jar:. -Dpython.home=../../Applications/atlassian/jython -Dpython.executable=../../Applications/atlassian/jython/bin/jython -Dpython.launcher.uname=linux -Dpython.launcher.tty=true org.python.util.jython

are we missing anything still, please check. As per your suggestion seems to be our confluence add-on problem as local is working fine, but not sure where are we missing it and why it is working for 2.5.3 and not for 2.7.0. still a confusion.