saintstack commented on a change in pull request #2286:
URL: https://github.com/apache/hbase/pull/2286#discussion_r474406789



##########
File path: 
hbase-server/src/test/java/org/apache/hadoop/hbase/TestJMXConnectorServer.java
##########
@@ -56,39 +58,47 @@
   private static Configuration conf = null;
   private static Admin admin;
   // RMI registry port
-  private static int rmiRegistryPort = 61120;
+  private static int rmiRegistryPort;
   // Switch for customized Accesscontroller to throw ACD exception while 
executing test case
-  static boolean hasAccess;
+  private volatile static boolean hasAccess;
 
-  @Before
-  public void setUp() throws Exception {
-    UTIL = new HBaseTestingUtility();
+  @BeforeClass
+  public static void setUpBeforeClass() throws Exception {
     conf = UTIL.getConfiguration();
+    String cps = JMXListener.class.getName() + "," + 
MyAccessController.class.getName();
+    conf.set(CoprocessorHost.MASTER_COPROCESSOR_CONF_KEY, cps);
+    conf.set(CoprocessorHost.REGIONSERVER_COPROCESSOR_CONF_KEY, cps);
+    rmiRegistryPort = UTIL.randomFreePort();

Review comment:
       In my experience it is strange how often we meet clashes.  Any chance of 
catching BindException and retrying?




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