[infinispan-issues] [JBoss JIRA] (ISPN-5379) Persistence with stringKeyedJdbcStore throwing ConcurrentModificationException while adding data to cache

Persistence with stringKeyedJdbcStore throwing ConcurrentModificationException while adding data to cache ---------------------------------------------------------------------------------------------------------- Key: ISPN-5379 URL: https://issues.jboss.org/browse/ISPN-5379 Project: Infinispan Issue Type: Bug Components: Core, Loaders and Stores Affects Versions: 6.0.2.Final Reporter: Dan Berindei Assignee: Dan Berindei Fix For: 8.0.0.Final From Dennis Reed: A ConcurrentModificationException in the CacheWriter interceptor during a commit. java.util.ConcurrentModificationException at java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:953) at java.util.LinkedList$ListItr.next(LinkedList.java:886) at org.infinispan.interceptors.CacheWriterInterceptor.store(CacheWriterInterceptor.java:210) at org.infinispan.interceptors.CacheWriterInterceptor.commitCommand(CacheWriterInterceptor.java:115) The code is looping through the modifications associated with the transaction: List<WriteCommand> modifications = ctx.getCacheTransaction().getAllModifications(); ... 210: for (WriteCommand cacheCommand : modifications) { The transaction's modification list is stored as a synchronized list with a comment "we need to synchronize this collection to be able to get a valid snapshot from another thread during state transfer". But this thread is not doing state transfer, and I'd assume "get a valid snapshot" wouldn't include modification? Is it valid for this list to be modified from another thread (in which case all iterations should be synchronized), or is something modifying it incorrectly?