AbstractCacheTransaction.hasLockOrIsLockBackup may cause NPE ------------------------------------------------------------ Key: ISPN-2728 URL: https://issues.jboss.org/browse/ISPN-2728 Project: Infinispan Issue Type: Bug Affects Versions: 5.2.0.CR1 Reporter: Radim Vansa Assignee: Mircea Markus {{AbstractCacheTransaction.hasLockOrIsLockBackup}} can be called from non-synchronized context (particularly from the {{AbstractTxLockingInterceptor}} when iterating through all transactions from older topology). If the transaction is committed in parallel, {{AbstractCacheTransaction.clearLockedKeys}} is called which nulls the volatile field {{lockedKeys}}. {code} lockedKeys != null && lockedKeys.contains(key) {code} Contains a race condition - lockedKey may be nulled between the checks. Similar with {{backupKeyLocks}} but these are never nulled.