how to reproduce java.io.IOException exception for Runtime.exec()?

Question

At times, I get "java.io.IOException: error=12, Cannot allocate memory" in my java application.

I want to reproduce it on my machine. Is there a way to reproduce this error? When will Runtime.exec throw java.io.IOException?

FYI, [root@ara ~]# java -version java version "1.6.0_22" Java(TM) SE Runtime Environment (build 1.6.0_22-b04) Java HotSpot(TM) 64-Bit Server VM (build 17.1-b03, mixed mode)

I want to reproduce it, to test my exception handling code. I need to test the code path of exception handling. — maheshkanse, Feb 07 '13 at 07:51

score 1 · Answer 1 · edited May 23 '17 at 11:52

You can get your answer from this:

Try it on an old OpenJDK version. It seems to be a JVM bug.
Set overcommit_memory to 2 (don't overcommit)

echo 2 > /proc/sys/vm/overcommit_memory

Run the following program:

public class ReproduceException {

   public static void main(String[] args) throws IOException {
        Runtime.getRuntime().exec("ls");
   }

}

score 0 · Answer 2 · answered Feb 07 '13 at 07:38

0

I've linked a question that explains what causes this problem and gives at least 2 ways to fix it. From the explanation you should be able to figure out a strategy for causing it ... if that is still of interest after you've read the Q&A.

answered Feb 07 '13 at 07:38

Stephen C

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how to reproduce java.io.IOException exception for Runtime.exec()?

2 Answers2