diff -r 6c1d8b5553d8 -r 40cabcdcd2be samples/deadlock/src/org/apidesign/javamonitorflaws/CacheOK.java
--- a/samples/deadlock/src/org/apidesign/javamonitorflaws/CacheOK.java	Thu Feb 12 10:55:02 2009 +0100
+++ b/samples/deadlock/src/org/apidesign/javamonitorflaws/CacheOK.java	Thu Oct 30 21:30:10 2014 +0100
@@ -14,7 +14,7 @@
  */
 // BEGIN: monitor.pitfalls.CacheOK
 public abstract class CacheOK<From,To> {
-    private Object LOCK = new Object();
+    private final Object LOCK = new Object();
 
     private Map<From,To> cache;