FULL PRODUCT VERSION :
java version "1.6.0_22"
Java(TM) SE Runtime Environment (build 1.6.0_22-b04)

ADDITIONAL OS VERSION INFORMATION :
Linux <user> 2.6.34.7-61.fc13.i686.PAE #1 SMP Tue Oct 19 04:24:06 UTC 2010 i686 i686 i386 GNU/Linux

EXTRA RELEVANT SYSTEM CONFIGURATION :
Cups version 1.4.4 with four printers installed

VM arguments:
-Xmx4m (reduce to get the OutOfMemoryError faster)
-XX:-HeapDumpOnOutOfMemoryError

A DESCRIPTION OF THE PROBLEM :
There is a memory leak in class sun.print.CustomMediaSizeName that can be forced by using the PrintService.addPrintServiceAttributeListener().

The constructor of class CustomMediaSizeName adds the name and itself into a static list. So with every creation the list gets bigger and bigger and will never be cleared.
Using the PrintService.addPrintServiceAttributeListener() always creates a set of ~60 instances of this class that will be added to the list.

Using a HashMap would solve this problem, because there is no need to have thousands of "A4" media size names in memory.

Source code (http://www.docjar.com/html/api/sun/print/CustomMediaSizeName.java.html):

class CustomMediaSizeName extends MediaSizeName {
    private static ArrayList customStringTable = new ArrayList();
    private static ArrayList customEnumTable = new ArrayList();
    private String choiceName;
    private MediaSizeName mediaName;

    private CustomMediaSizeName(int x) {
super(x);

    }

    private synchronized static int nextValue(String name) {
      customStringTable.add(name);
      
      return (customStringTable.size()-1);
    }

    public CustomMediaSizeName(String name) {
super(nextValue(name));
customEnumTable.add(this);
choiceName = null;
mediaName = null;
    }
    ....
}

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
see source code


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
package de.comsoft.cadas.tools;

import javax.print.DocFlavor;
import javax.print.PrintService;
import javax.print.PrintServiceLookup;
import javax.print.event.PrintServiceAttributeEvent;
import javax.print.event.PrintServiceAttributeListener;

public class TestCustomMediaSizeName
        implements PrintServiceAttributeListener {

    public static void main(final String[] args) {
        final TestCustomMediaSizeName test = new TestCustomMediaSizeName();
        test.run();
    }

    private void run() {
        final PrintService[] services = PrintServiceLookup.lookupPrintServices(
                DocFlavor.SERVICE_FORMATTED.PRINTABLE, null);
        for (final PrintService printService : services) {
            printService.addPrintServiceAttributeListener(this);
        }

        try {
            Thread.sleep(Long.MAX_VALUE);
        } catch (final InterruptedException ex) {
            // TODO Auto-generated catch block
            ex.printStackTrace();
        }
    }

    public void attributeUpdate(final PrintServiceAttributeEvent pPsae) {
        // nothing
    }
}

---------- END SOURCE ----------