title: Java error java.util.concurrent.ConcurrentHashMap.keySet
body: <p>Hey guy's am getting this error:
  Can you guy's possibly try to fix this? or see whats wrong post a fix or something </p>
  
  <p>Thanks alot guy's :)</p>
  
  <pre><code>Exception in thread "ExtensionHandler-1" java.lang.NoSuchMethodE
  rror: java.util.concurrent.ConcurrentHashMap.keySet()Ljava/util/concurrent/Concu
  rrentHashMap$KeySetView;
          at aerivial.requests.aqw.GetAction.process(GetAction.java:196)
          at it.gotoandplay.smartfoxserver.controllers.ExtensionHandler.processEve
  nt(ExtensionHandler.java:535)
          at it.gotoandplay.smartfoxserver.controllers.ExtensionHandler.run(Extens
  ionHandler.java:344)
          at java.lang.Thread.run(Thread.java:619)
  </code></pre>
  
  <p>The error Code:</p>
  
  <pre><code>        ConcurrentHashMap tgtBuffDebuffs = (ConcurrentHashMap)userTgt.properties.get(Users.BUFFS_DEBUFFS);
  
          for (Iterator i = tgtBuffDebuffs.keySet().iterator(); i.hasNext(); ) { int auraId = ((Integer)i.next());
            Aura aura = (Aura)World.instance.auras.get(Integer.valueOf(auraId));
            if ((aura.getDamage() &gt;= 0.0D) &amp;&amp; (!aura.getCategory().equals("d"))) {
              damage = (int)(damage * aura.getDamage());
            }
          }
  </code></pre>