--- old/src/share/vm/prims/jvmtiExport.cpp	2016-10-24 19:13:35.453523545 +0900
+++ new/src/share/vm/prims/jvmtiExport.cpp	2016-10-24 19:13:35.378523284 +0900
@@ -2382,6 +2382,7 @@
       if (!agent_lib->is_static_lib()) {
         os::dll_unload(library);
       }
+      st->print_cr("Could not find entry point in %s\n", agent_lib->name());
       delete agent_lib;
     } else {
       // Invoke the Agent_OnAttach function
@@ -2412,6 +2413,11 @@
       result = JNI_OK;
     }
   }
+
+  if ((result != JNI_OK) && (*ebuf != '0')) {
+    st->print_cr("%s\n", ebuf);
+  }
+
   return result;
 }