--- old/src/share/vm/logging/logLevel.hpp	2015-11-19 15:35:24.106128675 +0100
+++ new/src/share/vm/logging/logLevel.hpp	2015-11-19 15:35:23.986128679 +0100
@@ -49,7 +49,7 @@
 //  error   - Critical messages caused by errors.
 //
 #define LOG_LEVEL_LIST \
-  NOT_PRODUCT(LOG_LEVEL(Develop, develop)) \
+  LOG_LEVEL(Develop, develop) \
   LOG_LEVEL(Trace, trace) \
   LOG_LEVEL(Debug, debug) \
   LOG_LEVEL(Info, info) \