### Eclipse Workspace Patch 1.0
#P lucene-modified [trunk]
Index: src/java/org/apache/lucene/util/Constants.java
===================================================================
--- src/java/org/apache/lucene/util/Constants.java	(revision 779600)
+++ src/java/org/apache/lucene/util/Constants.java	(working copy)
@@ -69,7 +69,10 @@
       try {
         Manifest manifest = new Manifest(s);
         Attributes attr = manifest.getMainAttributes();
-        v = attr.getValue(Attributes.Name.IMPLEMENTATION_VERSION);
+        String value = attr.getValue(Attributes.Name.IMPLEMENTATION_VERSION);
+        if (value != null) {
+          v = value;
+        }
       } finally {
         if (s != null) {
           s.close();