--- a/hotspot/src/share/vm/logging/log.cpp	Fri Apr 01 10:16:31 2016 +0200
+++ b/hotspot/src/share/vm/logging/log.cpp	Mon Apr 04 09:59:57 2016 +0200
@@ -124,7 +124,7 @@
 
   // Enable 'logging=info', verifying it has been set
   LogConfiguration::configure_stdout(LogLevel::Info, true, LOG_TAGS(logging));
-  assert_str_eq("logging=info,", stdoutput->config_string());
+  assert_str_eq("logging=info", stdoutput->config_string());
   assert(log_is_enabled(Info, logging), "logging was not properly enabled");
 
   // Enable 'gc=debug' (no wildcard), verifying no other tags are enabled

--- a/hotspot/src/share/vm/logging/logOutput.cpp	Fri Apr 01 10:16:31 2016 +0200
+++ b/hotspot/src/share/vm/logging/logOutput.cpp	Mon Apr 04 09:59:57 2016 +0200
@@ -56,6 +56,11 @@
   }
 
   size_t offset = strlen(_config_string);
+  if (offset > 0) {
+    // Add commas in-between tag and level combinations in the config string
+    _config_string[offset++] = ',';
+  }
+
   for (;;) {
     int ret = ts->label(_config_string + offset, _config_string_buffer_size - offset, "+");
     if (ret == -1) {
@@ -69,7 +74,7 @@
 
   offset = strlen(_config_string);
   for (;;) {
-    int ret = jio_snprintf(_config_string + offset, _config_string_buffer_size - offset, "=%s,", LogLevel::name(level));
+    int ret = jio_snprintf(_config_string + offset, _config_string_buffer_size - offset, "=%s", LogLevel::name(level));
     if (ret == -1) {
       _config_string_buffer_size *= 2;
       _config_string = REALLOC_C_HEAP_ARRAY(char, _config_string, _config_string_buffer_size, mtLogging);