Index: lucene/CHANGES.txt
===================================================================
--- lucene/CHANGES.txt	(revision 1212698)
+++ lucene/CHANGES.txt	(working copy)
@@ -57,6 +57,12 @@
 * LUCENE-3627: Don't let an errant 0-byte segments_N file corrupt the index.
   (Ken McCracken via Mike McCandless)
 
+* LUCENE-3630: The internal method MultiReader.doOpenIfChanged(boolean doClone)
+  was overriding IndexReader.doOpenIfChanged(boolean readOnly), so changing the
+  contract of the overridden method. This method was renamed and made private.
+  In ParallelReader the bug was not existent, but the implementation method
+  was also made private.  (Uwe Schindler)
+
 Documentation
 
 * LUCENE-3597: Fixed incorrect grouping documentation. (Martijn van Groningen, Robert Muir)
Index: lucene/src/java/org/apache/lucene/index/MultiReader.java
===================================================================
--- lucene/src/java/org/apache/lucene/index/MultiReader.java	(revision 1212698)
+++ lucene/src/java/org/apache/lucene/index/MultiReader.java	(working copy)
@@ -109,7 +109,7 @@
    */
   @Override
   protected synchronized IndexReader doOpenIfChanged() throws CorruptIndexException, IOException {
-    return doOpenIfChanged(false);
+    return doReopen(false);
   }
   
   /**
@@ -124,7 +124,7 @@
   @Override
   public synchronized Object clone() {
     try {
-      return doOpenIfChanged(true);
+      return doReopen(true);
     } catch (Exception ex) {
       throw new RuntimeException(ex);
     }
@@ -137,7 +137,7 @@
    * @throws CorruptIndexException
    * @throws IOException
    */
-  protected IndexReader doOpenIfChanged(boolean doClone) throws CorruptIndexException, IOException {
+  private IndexReader doReopen(boolean doClone) throws CorruptIndexException, IOException {
     ensureOpen();
     
     boolean changed = false;
Index: lucene/src/java/org/apache/lucene/index/ParallelReader.java
===================================================================
--- lucene/src/java/org/apache/lucene/index/ParallelReader.java	(revision 1212698)
+++ lucene/src/java/org/apache/lucene/index/ParallelReader.java	(working copy)
@@ -174,7 +174,7 @@
     return doReopen(false);
   }
     
-  protected IndexReader doReopen(boolean doClone) throws CorruptIndexException, IOException {
+  private IndexReader doReopen(boolean doClone) throws CorruptIndexException, IOException {
     ensureOpen();
     
     boolean reopened = false;