The code below ( procs.java ) exhibits memory leak at runtime.
The problem does not occur with JDK1.1FCS version.

File: procs.java

import java.io.IOException;

class procs {
    private Runtime _runtime;
    private String _cmdline;

    public procs (String cmdline)
    {
        _runtime = Runtime.getRuntime();
        _cmdline = cmdline;
    }

    public void executeCmdline()
    {
        Process p;
        int retval;

        try {
            p = _runtime.exec(_cmdline);
        }
        catch (SecurityException se) {
            System.err.println(se);
            return;
        }
        catch (IOException ioe) {
            System.err.println(ioe);
            return;
        }
        try {
            p.waitFor();
        }
        catch (InterruptedException ie) {
            System.err.println(ie);
        }
        try {
            retval = p.exitValue();
            if (retval != 0) {
                System.err.println("ERROR: Process " + p + " returned "
+ retval);
            }
        }
        catch (IllegalThreadStateException itse) {
            System.err.println(itse);
        }
    }

    public static void main(String[] args)
    {
        procs p1, p2;

        p1 = new procs("/usr/bin/date");
        while (true) {
            p1.executeCmdline();
        }
    }
    
}

-----------------------

Using jdk.1-1fcs


maria: java -version
java version "1.0.2dp:12/18/96-17:52"
maria: java procs

maria: /usr/ucb/ps -auxw | grep maria
maria 24302 10.6 3.4 3056 2064 pts/0 S 18:23:00 0:06 /usr/dist/share/jws,v1.0a/5bin.sun4/JDK/bin/../bin/sparc/java procs
maria 24213 0.0 1.7 1176 1040 pts/0 S 18:20:02 0:00 -csh
maria 24247 0.0 1.7 1176 1040 pts/1 S 18:21:08 0:00 -csh
maria 25349 0.0 0.3 152 152 pts/0 R 18:23:52 0:00 /usr/bin/date
maria 25350 0.0 1.7 1176 1040 pts/1 R 18:23:52 0:00 -csh
maria: !!
/usr/ucb/ps -auxw | grep maria
maria 24302 11.0 3.4 3056 2064 pts/0 R 18:23:00 0:07 /usr/dist/share/jws,v1.0a/5bin.sun4/JDK/bin/../bin/sparc/java procs
maria 24213 0.0 1.7 1176 1040 pts/0 S 18:20:02 0:00 -csh
maria 24247 0.0 1.7 1176 1040 pts/1 R 18:21:08 0:00 -csh
maria 25513 0.0 0.3 152 152 pts/0 R 18:24:00 0:00 /usr/bin/date
maria: !!
/usr/ucb/ps -auxw | grep maria
maria 24302 11.2 3.4 3056 2064 pts/0 S 18:23:00 0:07 /usr/dist/share/jws,v1.0a/5bin.sun4/JDK/bin/../bin/sparc/java procs
maria 25654 0.1 0.3 192 192 pts/0 R 18:24:07 0:00 /usr/bin/date
maria 24213 0.0 1.7 1176 1040 pts/0 S 18:20:02 0:00 -csh
maria 24247 0.0 1.7 1176 1040 pts/1 R 18:21:08 0:00 -csh
maria: !!
/usr/ucb/ps -auxw | grep maria
maria 24302 11.7 3.4 3056 2064 pts/0 S 18:23:00 0:14 /usr/dist/share/jws,v1.0a/5bin.sun4/JDK/bin/../bin/sparc/java procs
maria 26897 0.1 0.7 784 392 pts/0 R 18:25:08 0:00 /usr/bin/date
maria 24213 0.0 1.7 1176 1040 pts/0 S 18:20:02 0:00 -csh
maria 24247 0.0 1.7 1176 1040 pts/1 R 18:21:08 0:00 -csh

------------------------

Using jdk-1.1.2 ( same result using jdk-1.1.1)

maria: java -version
java version "1.1.2"
maria: javac procs.java
maria: java procs

maria: !!
/usr/ucb/ps -auxw | grep maria
maria 28966 12.6 5.7 4144 3512 pts/0 S 18:31:46 0:03 /net/jakarta.corp/export2/Java/jdk_1.1.2/jdk1.1.2/bin/../bin/sparc/gre
maria 29328 0.1 0.7 832 440 pts/1 R 18:32:00 0:00 grep maria
maria 24213 0.0 1.7 1176 1056 pts/0 S 18:20:02 0:00 -csh
maria 24247 0.0 1.7 1176 1040 pts/1 S 18:21:08 0:00 -csh
maria 29326 0.0 0.7 816 424 pts/0 R 18:32:00 0:00 /usr/bin/date
maria: !!
/usr/ucb/ps -auxw | grep maria
maria 28966 15.7 5.7 4144 3512 pts/0 R 18:31:46 0:05 /net/jakarta.corp/export2/Java/jdk_1.1.2/jdk1.1.2/bin/../bin/sparc/gre
maria 29479 0.1 1.2 832 712 pts/1 S 18:32:06 0:00 grep maria
maria 24213 0.0 1.7 1176 1056 pts/0 S 18:20:02 0:00 -csh
maria 24247 0.0 1.7 1176 1040 pts/1 S 18:21:08 0:00 -csh
maria 29477 0.0 1.1 4144 640 pts/0 S 18:32:06 0:00 /net/jakarta.corp/export2/Java/jdk_1.1.2/jdk1.1.2/bin/../bin/sparc/gre
maria: !!
/usr/ucb/ps -auxw | grep maria
maria 28966 17.9 5.7 4152 3520 pts/0 R 18:31:46 0:06 /net/jakarta.corp/export2/Java/jdk_1.1.2/jdk1.1.2/bin/../bin/sparc/gre
maria 29658 0.1 1.2 832 712 pts/1 S 18:32:13 0:00 grep maria
maria 24213 0.0 1.7 1176 1056 pts/0 S 18:20:02 0:00 -csh
maria 24247 0.0 1.7 1176 1040 pts/1 S 18:21:08 0:00 -csh
maria 29656 0.0 0.6 4152 368 pts/0 R 18:32:13 0:00 /net/jakarta.corp/export2/Java/jdk_1.1.2/jdk1.1.2/bin/../bin/sparc/gre