ConcurrentModificationException in IndexMerger
----------------------------------------------
Key: JCR-2747
URL: https://issues.apache.org/jira/browse/JCR-2747
Project: Jackrabbit Content Repository
Issue Type: Bug
Components: indexing, jackrabbit-core
Affects Versions: 2.1.1, 2.1.0, 2.0.0
Reporter: Jukka Zitting
Fix For: 2.2.0
The IndexMerger.start() method can cause the following
ConcurrentModificationException to be thrown since it doesn't protect against
concurrent access to the busyMergers list. The workers started by the start()
method will remove themselves from the busyMergers list, which makes it
possible for a quick worker to concurrently modify the list before the start()
method is finished iterating through it.
java.util.ConcurrentModificationException
at
java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
at java.util.AbstractList$Itr.next(AbstractList.java:343)
at
org.apache.jackrabbit.core.query.lucene.IndexMerger.start(IndexMerger.java:122)
at
org.apache.jackrabbit.core.query.lucene.MultiIndex.<init>(MultiIndex.java:325)
at
org.apache.jackrabbit.core.query.lucene.SearchIndex.doInit(SearchIndex.java:507)
at
org.apache.jackrabbit.core.query.AbstractQueryHandler.init(AbstractQueryHandler.java:78)
at
org.apache.jackrabbit.core.config.RepositoryConfigurationParser$1.getQueryHandler(RepositoryConfigurationParser.java:630)
at
org.apache.jackrabbit.core.config.WorkspaceConfig.getQueryHandler(WorkspaceConfig.java:215)
at
org.apache.jackrabbit.core.config.WorkspaceConfig.getQueryHandler(WorkspaceConfig.java:215)
at
org.apache.jackrabbit.core.SearchManager.<init>(SearchManager.java:173)
at
org.apache.jackrabbit.core.RepositoryImpl$WorkspaceInfo.getSearchManager(RepositoryImpl.java:1868)
at
org.apache.jackrabbit.core.RepositoryImpl$WorkspaceInfo.doPostInitialize(RepositoryImpl.java:2077)
at
org.apache.jackrabbit.core.RepositoryImpl$WorkspaceInfo.initialize(RepositoryImpl.java:1996)
at
org.apache.jackrabbit.core.RepositoryImpl.initStartupWorkspaces(RepositoryImpl.java:535)
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