I found this exception when get roster or update roster =>
2013.07.19 14:20:55 org.jivesoftware.openfire.handler.PresenceSubscribeHandler - Internal server error
com.hazelcast.nio.HazelcastSerializationException: java.lang.NullPointerException
at com.hazelcast.nio.AbstractSerializer.toByte(AbstractSerializer.java:111)
at com.hazelcast.nio.AbstractSerializer.toByteArray(AbstractSerializer.java:139)
at com.hazelcast.nio.Serializer.writeObject(Serializer.java:56)
at com.hazelcast.impl.ThreadContext.toData(ThreadContext.java:131)
at com.hazelcast.nio.IOUtil.toData(IOUtil.java:139)
at com.hazelcast.impl.BaseManager$RequestBasedCall.setLocal(BaseManager.java:512)
at com.hazelcast.impl.BaseManager$ResponseQueueCall.setLocal(BaseManager.java:544)
at com.hazelcast.impl.ConcurrentMapManager$MPut.txnalPut(ConcurrentMapManager.java :1874)
at com.hazelcast.impl.ConcurrentMapManager$MPut.txnalPut(ConcurrentMapManager.java :1828)
at com.hazelcast.impl.ConcurrentMapManager$MPut.put(ConcurrentMapManager.java:1690 )
at com.hazelcast.impl.MProxyImpl$MProxyReal.put(MProxyImpl.java:634)
at com.hazelcast.impl.MProxyImpl$MProxyReal.put(MProxyImpl.java:608)
at com.hazelcast.impl.MProxyImpl.put(MProxyImpl.java:173)
at com.hazelcast.impl.MProxyImpl.put(MProxyImpl.java:124)
at com.jivesoftware.util.cache.ClusteredCache.put(ClusteredCache.java:81)
at org.jivesoftware.util.cache.CacheWrapper.put(CacheWrapper.java:129)
at org.jivesoftware.openfire.roster.RosterManager$2.contactUpdated(RosterManager.j ava:449)
at org.jivesoftware.openfire.roster.RosterEventDispatcher.contactUpdated(RosterEve ntDispatcher.java:124)
at org.jivesoftware.openfire.roster.Roster.updateRosterItem(Roster.java:588)
&&&&&&&&
2013.07.19 14:39:58 org.jivesoftware.openfire.handler.PresenceUpdateHandler - Internal server error. Triggered by packet:
com.hazelcast.nio.HazelcastSerializationException: Problem when serializing type 1
at com.hazelcast.nio.AbstractSerializer.toObject(AbstractSerializer.java:128)
at com.hazelcast.nio.AbstractSerializer.toObject(AbstractSerializer.java:156)
at com.hazelcast.nio.Serializer.readObject(Serializer.java:75)
at com.hazelcast.impl.ThreadContext.toObject(ThreadContext.java:135)
at com.hazelcast.nio.IOUtil.toObject(IOUtil.java:163)
at com.hazelcast.impl.DefaultRecord.getValue(DefaultRecord.java:64)
at com.hazelcast.impl.ConcurrentMapManager$MGet.get(ConcurrentMapManager.java:1109 )
at com.hazelcast.impl.MProxyImpl$MProxyReal.get(MProxyImpl.java:783)
at com.hazelcast.impl.MProxyImpl.get(MProxyImpl.java:114)
at com.jivesoftware.util.cache.ClusteredCache.get(ClusteredCache.java:86)
at org.jivesoftware.util.cache.CacheWrapper.get(CacheWrapper.java:121)
at org.jivesoftware.openfire.roster.RosterManager.getRoster(RosterManager.java:154 )
at org.jivesoftware.openfire.handler.PresenceUpdateHandler.initSession(PresenceUpd ateHandler.java:362)
anyone help me, pleaseee???