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powermock : ProcessBuilder redirectErrorStream giving nullPointerException

 
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I am using powermock to mock some native command invocation using process builder. the strange thing is these test pass sometimes and fail sometimes giving a NPE. Is this a powermock issue or some gotcha in the program.

the snippet of the class under test is..

and the unit test case is ..

I get an error on execution an the test case fails..


Note : I do not get this error on all executions. Sometimes it passes and sometimes it fails. I am not able to understand this behavior.
Also, I have camouflaged some variable names because of the copyright issues.. Please bear !!




 
Kaustubh Patil
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Experts ?? any clues why is this happening ?
 
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