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java.lang.NullPointerException: 	at org.apache.directory.server.kerberos.shared.store.operations.GetPrincipal.getEntry(GetPrincipal.java:97)	at org.apache.directory.server.kerberos.shared.store.operations.GetPrincipal.execute(GetPrincipal.java:81)	at org.apache.directory.server.kerberos.shared.store.SingleBaseSearch.getPrincipal(SingleBaseSearch.java:63)	at org.apache.directory.server.kerberos.shared.store.DirectoryPrincipalStore.getPrincipal(DirectoryPrincipalStore.java:71)	at org.apache.directory.server.kerberos.shared.KerberosUtils.getEntry(KerberosUtils.java:311)	at org.apache.directory.server.kerberos.kdc.ticketgrant.TicketGrantingService.getRequestPrincipalEntry(TicketGrantingService.java:310)	at org.apache.directory.server.kerberos.kdc.ticketgrant.TicketGrantingService.execute(TicketGrantingService.java:103)	at org.apache.directory.server.kerberos.protocol.KerberosProtocolHandler.messageReceived(KerberosProtocolHandler.java:158)	at org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.messageReceived(DefaultIoFilterChain.java:721)	at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:433)	at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:47)	at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:801)	at org.apache.mina.filter.codec.ProtocolCodecFilter$ProtocolDecoderOutputImpl.flush(ProtocolCodecFilter.java:375)	at org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:229)	at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:433)	at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:47)	at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:801)	at org.apache.mina.core.filterchain.IoFilterAdapter.messageReceived(IoFilterAdapter.java:119)	at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:433)	at org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceived(DefaultIoFilterChain.java:425)	at org.apache.mina.core.polling.AbstractPollingConnectionlessIoAcceptor.readHandle(AbstractPollingConnectionlessIoAcceptor.java:436)	at org.apache.mina.core.polling.AbstractPollingConnectionlessIoAcceptor.processReadySessions(AbstractPollingConnectionlessIoAcceptor.java:407)	at org.apache.mina.core.polling.AbstractPollingConnectionlessIoAcceptor.access$600(AbstractPollingConnectionlessIoAcceptor.java:56)	at org.apache.mina.core.polling.AbstractPollingConnectionlessIoAcceptor$Acceptor.run(AbstractPollingConnectionlessIoAcceptor.java:360)	at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64)	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)	at java.lang.Thread.run(Unknown Source)