[infinispan-issues] [JBoss JIRA] (ISPN-7820) Document store-by-reference effects in functional commands

Document store-by-reference effects in functional commands ---------------------------------------------------------- Key: ISPN-7820 URL: https://issues.jboss.org/browse/ISPN-7820 Project: Infinispan Issue Type: Bug Components: Core, Test Suite - Core, Transactions Affects Versions: 9.0.0.Final Reporter: Radim Vansa Assignee: Radim Vansa Fix For: 9.1.0.CR1 In transactional mode, functional read write command loads the value into the context without making a defensive copy. Then, the function is applied directly on that value, exposing uncommitted changes to all other threads. Rollback is ineffective, the value is already changed. There are no tests for rollback in FunctionalTxInMemoryTest. Reproducer: {code:java} @Test public void testValueInContextIsACopy() throws Exception { Object key = getKeyForCache(cache(0, DIST), cache(1, DIST)); cache(0, DIST).put(key, new ArrayList()); tm.begin(); // nasty cast FunctionalMap.ReadWriteMap<Object, List> otherRw = (FunctionalMap.ReadWriteMap) rw; otherRw.eval(key, (Serializable & Function<EntryView.ReadWriteEntryView<Object, List>, Object>) view -> { List list = view.get(); list.add("woohoo"); view.set(list); return null; }).join(); tm.rollback(); assertEquals(new ArrayList(), cache(0, DIST).get(key)); } {code}