You can add a config file "./Calc/Contents/MacOS/SimpleCalc.config" and use a "jre" item to specify the location of jre directory by a relative path from the "SimpleCalc" to the jre directory.
For example, if you put 'jre/' to "./Calc/Contents/jre", then you can use "jre ../jre/".
You can add a config file "./Calc/Contents/MacOS/SimpleCalc.config" and use a "jre" item to specify the location of jre directory by a relative path from the "SimpleCalc" to the jre directory.
For example, if you put 'jre/' to "./Calc/Contents/jre", then you can use "jre ../jre/".
Please refer to http://www.jar2exe.com/createdexe/config/jre