IT41901: LOCAL CACHE RETURNS NULL IF A KEY IS REUSED AFTER EXPIRY

APAR status

• Closed as program error.

Error description

• If a key is re-used after expiring from a map then null is
  returned whenever that key is returned from the map. For
  example, the following test fails:
  @Test
   public void expiryTestWithReput() throws MbException {
     MbLocalMap map = new MbLocalMap();
     map.setTTL(1); //create entries that should already have
  expired
     Object object1 = new Object();
     Object object2 = new Object();
     map.put(object1, object2);
     try { Thread.sleep(1500); } catch(InterruptedException _ ) {
  }
     assertFalse(map.containsKey(object1));
     assertNull(map.get(object1));
  
     map.put(object1, object2);
     assertTrue(map.containsKey(object1));
     assertEquals(object2, map.get(object1));
   }
  

Local fix

• Using the remove() method to remove the expired key from the map
  allows code to be written which works around the problem.
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  All users of App Connect Enterprise version 12 using MbLocalMap
  or MbGlobalMap in local mode.
  
  
  Platforms affected:
  MultiPlatform
  
  ****************************************************************
  PROBLEM DESCRIPTION:
  <span style="background-color:rgb(255, 255, 255)">When using the
  cache in local mode, if a key is re-used after expiring from a
  map then null is </span><span style="background-color:rgb(255,
  255, 255)">returned whenever that key is returned from the map,
  even if a new value is subsequently inserted. For </span><span
  style="background-color:rgb(255, 255, 255)">example, the
  following test fails:                             </span>
  
  @Test<span style="background-color:rgb(255, 255, 255)">
                                                           </span>
  <span style="background-color:rgb(255, 255, 255)">public void
  expiryTestWithReput() throws MbException {        </span>
  <span style="background-color:rgb(255, 255, 255)">   MbLocalMap
  map = new MbLocalMap();                          </span>
  <span style="background-color:rgb(255, 255, 255)">
  map.setTTL(1); //create entries that should already have
  </span>
  <span style="background-color:rgb(255, 255, 255)">expired
                                                         </span>
  <span style="background-color:rgb(255, 255, 255)">   Object
  object1 = new Object();                              </span>
  <span style="background-color:rgb(255, 255, 255)">   Object
  object2 = new Object();                              </span>
  <span style="background-color:rgb(255, 255, 255)">
  map.put(object1, object2);
  </span>
  <span style="background-color:rgb(255, 255, 255)">   try {
  Thread.sleep(1500); } catch(InterruptedException _ ) {</span>
  <span style="background-color:rgb(255, 255, 255)">}
  
  </span>
  <span style="background-color:rgb(255, 255, 255)">
  assertFalse(map.containsKey(object1));
  </span>
  <span style="background-color:rgb(255, 255, 255)">
  assertNull(map.get(object1));
  </span>
  <span style="background-color:rgb(255, 255, 255)">
  
  </span>
  <span style="background-color:rgb(255, 255, 255)">
  map.put(object1, object2);
  </span>
  <span style="background-color:rgb(255, 255, 255)">
  assertTrue(map.containsKey(object1));
  </span>
  <span style="background-color:rgb(255, 255, 255)">
  assertEquals(object2, map.get(object1));
  </span>
  <span style="background-color:rgb(255, 255, 255)">}      </span>
  

Problem conclusion

• Key re-use now functions as expected after expiry from a local
  cache.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v12.0      12.0.6.0
  
  The latest available maintenance can be obtained from:
  http://www-01.ibm.com/support/docview.wss?rs=849&uid=swg27006041
  
  If the maintenance level is not yet available,information on
  its planned availability can be found on:
  http://www-1.ibm.com/support/docview.wss?rs=849&uid=swg27006308
  ---------------------------------------------------------------
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  APP CONNECT ENT

• Fixed component ID

  5724J0560

Applicable component levels