The -J option

The -J option allows you to pass options to the JVM instantiated by the wrapper. Each option specified by -J is placed between “java” and the class name in the command generated by the wrapper.

Example for Compiler

iscc -J-Discobol.compiler.const.const1=1 prog1.cbl

becomes:

java -Discobol.compiler.const.const1=1 com.iscobol.compiler.Pcc prog1.cbl

Example for Utilities

gife -J-Discobol.gife.efd_directory=/dev/myapp/efd

becomes

java -Discobol.gife.efd_directory=/dev/myapp/efd GIFE

Example for Runtime:

iscrun -J-Xmx512m -J-Discobol.conf=/myapp/conf PROG1

becomes:

java -Xmx512m -Discobol.conf=/myapp/conf com.iscobol.invoke.Isrun PROG1

Example for Debugger:

When you run the Debugger you must pay attention in using the -J option because there are two different virtual machines involved:

•	the java virtual machine that runs the Debugger

•	the java virtual machine instantiated by the Debugger, that runs the COBOL program

Options passed through -J are passed to the both java virtual machines, while options passed without -J are passed only to the second java virtual machine.

The following command, for example, shows how to pass the iscobol.debug.code_prefix property to the Debugger and a configuration file to the COBOL program:

iscrun -d -J-Discobol.debug.code_prefix=/myapp/src -Discobol.conf=/myapp/conf PROG1

That becomes:

java com.iscobol.invoke.Isrun -Discobol.debug.code_prefix=/myapp/src -d -Discobol.conf=/myapp/conf PROG1

The internal class com.iscobol.invoke.Isrun, if the -d option is used, behaves as follows: settings specified before the -d option are passed to the Debugger JVM and to the program JVM, instead settings specified after the -d option are passed only to the program JVM.