Write locks not acquired on newly created empty nodes ----------------------------------------------------- Key: JBCACHE-407 URL: http://jira.jboss.com/jira/browse/JBCACHE-407 Project: JBoss Cache Issue Type: Bug Security Level: Public(Everyone can see) Reporter: Brian Stansberry Assigned To: Manik Surtani Fix For: 2.0.0.GA When an empty node is created during a put (e.g node "/a" created as a result of a cache.put("/a/1", "key", "value"); call), only a read lock is acquired on the empty node. If the node is created as part of a transaction, the following failure can occur: 2 threads, empty cache, READ_COMMITTED 1) T1 starts a tx 2) T1 invokes cache.put("/a/1", "key", "value1"); 3) T2 invokes cache.put("/a/2", "key", "value2"); 4) T1's transaction rolls back 5) T2 invokes cache.get("/a/2", "key"); Should get "value2", will get null because the tx rollback will remove node /a and thus /a/2 as well. This IMO breaks READ_COMMITTED semantics, as T2 is able to "read" /a (in the sense of seeing it exists and thus can have children appended to it) before the tx that created /a is committed. New unit test IsolationLevelReadCommittedTest.testNodeCreationRollback() demonstrates the issue.