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java.lang.NullPointerException: null	at org.apache.activemq.store.kahadb.MessageDatabase.recoverIndex(MessageDatabase.java:906)	at org.apache.activemq.store.kahadb.MessageDatabase$5.execute(MessageDatabase.java:668)	at org.apache.activemq.store.kahadb.disk.page.Transaction.execute(Transaction.java:779)	at org.apache.activemq.store.kahadb.MessageDatabase.recover(MessageDatabase.java:665)	at org.apache.activemq.store.kahadb.MessageDatabase.open(MessageDatabase.java:434)	at org.apache.activemq.store.kahadb.MessageDatabase.load(MessageDatabase.java:452)	at org.apache.activemq.store.kahadb.MessageDatabase.doStart(MessageDatabase.java:285)	at org.apache.activemq.store.kahadb.KahaDBStore.doStart(KahaDBStore.java:215)	at org.apache.activemq.util.ServiceSupport.start(ServiceSupport.java:55)	at org.apache.activemq.store.kahadb.KahaDBPersistenceAdapter.doStart(KahaDBPersistenceAdapter.java:223)	at org.apache.activemq.util.ServiceSupport.start(ServiceSupport.java:55)	at org.apache.activemq.broker.BrokerService.doStartPersistenceAdapter(BrokerService.java:672)	at org.apache.activemq.broker.BrokerService.startPersistenceAdapter(BrokerService.java:656)	at org.apache.activemq.broker.BrokerService.start(BrokerService.java:620)