libjava/classpath/testsuite/java.lang/OutOfMemoryErrorTest.java

   1 import java.util.Vector;
   2
   3 /**
   4  * Under JavaSoft's VM they arbitarily limit the amount of memory
   5  * a Java application can use (though this can be overridden).  The
   6  * point here is to check to see whether or not an application being
   7  * run by Japhar will ever get the OutOfMemoryError or not when resources
   8  * are scarce. --brian
   9  */
  10 public class OutOfMemoryErrorTest
  11 {
  12   public static void main(String[] argv)
  13     {
  14       Vector v = null;
  15       Runtime r = null;
  16       long free = 0, total = 0;
  17       // quickly approach memory limit 1M at a time
  18       try {
  19         r = Runtime.getRuntime();
  20         v = new Vector();
  21         while(true)
  22           {
  23             v.addElement(new byte[1048576]);
  24           }
  25       }
  26       // out of memory error
  27       catch (OutOfMemoryError oomerr1)
  28         {
  29           // slowly encroach on memory limit 2 bytes+ at a time
  30           try {
  31             while(true)
  32               {
  33                 v.addElement(new byte[2]);
  34               }
  35           }
  36           // out of memory error
  37           catch (OutOfMemoryError oomerr2)
  38             {
  39               if (r != null)
  40                 {
  41                   free = r.freeMemory();
  42                   total = r.totalMemory();
  43                   v = null;
  44                   r.gc();
  45 //                System.out.println("free = " + free);
  46 //                System.out.println("total = " + total);
  47                   System.out.println("PASSED: ");
  48                 }
  49               else
  50                 System.out.println("FAILED: runtime unknown");
  51             }
  52         }
  53       // generic error
  54       catch (Error err)
  55         {
  56           System.out.println("FAILED: unexpected error");
  57         }
  58       // generic exception
  59       catch (Exception e)
  60         {
  61           System.out.println("FAILED: unexpected exception");
  62         }
  63     }
  64 }