*** old/test/testlibrary/com/oracle/java/testlibrary/Utils.java	Tue Oct 28 19:58:59 2014
--- new/test/testlibrary/com/oracle/java/testlibrary/Utils.java	Tue Oct 28 19:58:59 2014

*** 22,46 ****
--- 22,46 ----
   */
  
  package com.oracle.java.testlibrary;
  
  import static com.oracle.java.testlibrary.Asserts.assertTrue;
  
  import java.io.BufferedReader;
  import java.io.File;
  import java.io.FileReader;
  import java.io.IOException;
+ import java.lang.reflect.Field;
  import java.net.InetAddress;
  import java.net.ServerSocket;
  import java.net.UnknownHostException;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Arrays;
  import java.util.Collections;
! import java.util.regex.Pattern;
! import java.util.List;
+ import java.util.Random;
  import java.util.regex.Matcher;
! import java.lang.reflect.Field;
! import java.util.regex.Pattern;
  import sun.misc.Unsafe;
  
  /**
   * Common library for various test helper functions.
   */

*** 62,71 ****
--- 62,86 ----
      public static final String JAVA_OPTIONS = System.getProperty("test.java.opts", "").trim();
  
      private static Unsafe unsafe = null;
  
      /**
+      * Defines property name for seed value.
+      */
+     public static final String SEED_PROPERTY_NAME = "com.oracle.java.testlibrary.random.seed";
+ 
+     /* (non-javadoc)
+      * Random generator with (or without) predefined seed. Depends on
+      * "com.oracle.java.testlibrary.random.seed" property value.
+      */
+     private static volatile Random RANDOM_GENERATOR;
+ 
+     /**
+      * Contains the seed value used for {@link java.util.Random} creation.
+      */
+     public static final long SEED = Long.getLong(SEED_PROPERTY_NAME, new Random().nextLong());
+     /**
      * Returns the value of 'test.timeout.factor' system property
      * converted to {@code double}.
      */
      public static final double TIMEOUT_FACTOR;
      static {

*** 330,335 ****
--- 345,370 ----
              hexView[i++] = hexArray[b & 0x0F];
              hexView[i++] = ' ';
          }
          return new String(hexView);
      }
+ 
+     /**
+      * Returns {@link java.util.Random} generator initialized with particular seed.
+      * The seed could be provided via system property {@link Utils#SEED_PROPERTY_NAME}
+      * In case no seed is provided, the method uses a random number.
+      * The used seed printed to stdout.
+      * @return {@link java.util.Random} generator with particular seed.
+      */
+     public static Random getRandomInstance() {
+         if (RANDOM_GENERATOR == null) {
+             synchronized (Utils.class) {
+                 if (RANDOM_GENERATOR == null) {
+                     RANDOM_GENERATOR = new Random(SEED);
+                     System.out.printf("For random generator using seed: %d%n", SEED);
+                     System.out.printf("To re-run test with same seed value please add \"-D%s=%d\" to command line.%n", SEED_PROPERTY_NAME, SEED);
+                 }
+             }
+         }
+         return RANDOM_GENERATOR;
+     }
  }