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From "Wendy Feng (JIRA)" <>
Subject [jira] Created: (LUCENE-2520) Unsafe synchronization in CachingWrapperFilterHelper
Date Wed, 30 Jun 2010 01:50:50 GMT
Unsafe synchronization in CachingWrapperFilterHelper

                 Key: LUCENE-2520
             Project: Lucene - Java
          Issue Type: Bug
          Components: Search
    Affects Versions: 3.0.1
            Reporter: Wendy Feng

CachingWrapperFilterHelper has unsaft synchronization as follow:

 public DocIdSet getDocIdSet(IndexReader reader) throws IOException {
    if (cache == null) {
      cache = new WeakHashMap();
    synchronized (cache) {  

It is not safe to assgine a new object to cache before synchronizing on. it may results sycnchronize
on two different object if the method is called concurrently when cache =null.

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