GDG base entries are created via the IDCAMS DEFINE GENERATIONDATAGROUP command.

There is a section in the documentation on invoking IDCAMS from within your program, but it seems to presume the invoking program is Assembler.

In my experience, job step failure due to a GDG base being undefined is not something recovered from programmatically. Implementation plans include define all required GDG base entries.

Given below is the code snippet i used to create the GDG Base from java. We just add the IDCAMS SYSIN input to a string and execute the AccessMethodServices with that input. getoutputlines will give you the sysout from the IDCAMS command.

AccessMethodServices ams = new AccessMethodServices();

String gdgCreateString = "DEFINE GDG(NAME( " + dsName + " )  LIMIT(15)  NOEMPTY  SCRATCH)  " ;

ams.addInputLine(gdgCreateString );

int rc = ams.execute();

System.out.println(ams.getOutputLines());