V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

JES
       Java Enterprise System (Sun, Java)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

JES
       Job Entry Subsystem (IBM)


The Free On-line Dictionary of Computing (30 December 2018):

JES

   job entry system