Index: contrib/miscellaneous/src/test/org/apache/lucene/misc/ChainedFilterTest.java
===================================================================
--- contrib/miscellaneous/src/test/org/apache/lucene/misc/ChainedFilterTest.java	(revision 635542)
+++ contrib/miscellaneous/src/test/org/apache/lucene/misc/ChainedFilterTest.java	(working copy)
@@ -19,11 +19,17 @@
 
 import junit.framework.TestCase;
 import java.util.*;
+import java.io.IOException;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
 import org.apache.lucene.index.IndexWriter;
 import org.apache.lucene.index.Term;
+import org.apache.lucene.index.IndexWriter.MaxFieldLength;
+import org.apache.lucene.store.Directory;
+import org.apache.lucene.store.FSDirectory;
+import org.apache.lucene.store.NoLockFactory;
 import org.apache.lucene.store.RAMDirectory;
+import org.apache.lucene.analysis.Analyzer;
 import org.apache.lucene.analysis.WhitespaceAnalyzer;
 import org.apache.lucene.document.Document;
 import org.apache.lucene.document.Field;
@@ -151,5 +157,32 @@
   private Date parseDate(String s) throws ParseException {
     return new SimpleDateFormat("yyyy MMM dd", Locale.US).parse(s);
   }
+  
+  public void testWithCachingFilter() throws Exception {
+    Directory dir = new RAMDirectory();
+    Analyzer analyzer = new WhitespaceAnalyzer();
 
+    IndexWriter writer = new IndexWriter(dir, analyzer, true, MaxFieldLength.LIMITED);
+    writer.close();
+
+    Searcher searcher = new IndexSearcher(dir);
+
+    Query query = new TermQuery(new Term("none", "none"));
+
+    QueryWrapperFilter queryFilter = new QueryWrapperFilter(query);
+    CachingWrapperFilter cachingFilter = new CachingWrapperFilter(queryFilter);
+
+    searcher.search(query, cachingFilter, 1);
+
+    CachingWrapperFilter cachingFilter2 = new CachingWrapperFilter(queryFilter);
+    Filter[] chain = new Filter[2];
+    chain[0] = cachingFilter;
+    chain[1] = cachingFilter2;
+    ChainedFilter cf = new ChainedFilter(chain);
+
+    // throws java.lang.ClassCastException: org.apache.lucene.util.OpenBitSet cannot be cast to java.util.BitSet
+    searcher.search(new MatchAllDocsQuery(), cf, 1);
+
+  }
+
 }