Home/ Questions/Q 7690061
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-31T20:18:39+00:00

I must use pkzip in my java program to zip (since standard java zip

  • 0

I must use pkzip in my java program to zip (since standard java zip routine does not work on mainframe), I think it zip correctly, however it take a long time to finish. Here is mycode

 Runtime myruntime = Runtime.getRuntime();
 Process newproc = myruntime.exec("c:\\app\\pkzipc.exe -add c:\\output\\test.zip c:\\doc\\foo.pdf c:\\doc\\bar.doc"");

foo.pdf and bar.doc are about 20MB each, if I execute this via commandline, then it take about a second to zip, but when I use the java, it take 30 min to 1 hours to finish the zipping. Any idea why?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    You need to make sure that you are reading from the standard output and error streams of the child process. If pkzip generates output then it will be buffered by the operating system, and if the buffer fills up then you can expect the child process to block until the buffer is cleared.

    The Process object has methods for obtaining the input, output and error streams. Create new threads that read from the output and error streams and either pipe them to System.out and System.err, or just discard the output if you don’t care about it.

    • 0