--- old/src/share/vm/logging/logConfiguration.cpp	2016-08-26 14:13:04.861477241 +0200
+++ new/src/share/vm/logging/logConfiguration.cpp	2016-08-26 14:13:04.661478325 +0200
@@ -44,6 +44,9 @@
 LogConfiguration::UpdateListenerFunction* LogConfiguration::_listener_callbacks = NULL;
 size_t      LogConfiguration::_n_listener_callbacks = 0;
 
+// LogFileOutput is the default type of output, its type prefix should be used if no type was specified
+static const char* implicit_output_prefix = LogFileOutput::Prefix;
+
 // Stack object to take the lock for configuring the logging.
 // Should only be held during the critical parts of the configuration
 // (when calling configure_output or reading/modifying the outputs array).
@@ -108,6 +111,7 @@
 }
 
 // Normalizes the given LogOutput name to type=name form.
+// For example, foo, "foo", file="foo", will all be normalized to file=foo (no quotes, prefixed).
 static bool normalize_output_name(const char* full_name, char* buffer, size_t len, outputStream* errstream) {
   const char* start_quote = strchr(full_name, '"');
   const char* equals = strchr(full_name, '=');
@@ -128,7 +132,7 @@
     prefix = full_name;
     prefix_len = equals - full_name + 1;
   } else if (!is_stdout_or_stderr) {
-    prefix = "file=";
+    prefix = implicit_output_prefix;
     prefix_len = strlen(prefix);
   }
   size_t name_len = strlen(name);
@@ -168,7 +172,7 @@
                                         const char* options,
                                         outputStream* errstream) {
   LogOutput* output;
-  if (strncmp(name, "file=", strlen("file=")) == 0) {
+  if (strncmp(name, LogFileOutput::Prefix, strlen(LogFileOutput::Prefix)) == 0) {
     output = new LogFileOutput(name);
   } else {
     errstream->print_cr("Unsupported log output type: %s", name);
@@ -395,7 +399,7 @@
     }
   } else { // Output specified using name
     // Normalize the name, stripping quotes and ensures it includes type prefix
-    size_t len = strlen(outputstr) + strlen("file=") + 1;
+    size_t len = strlen(outputstr) + strlen(implicit_output_prefix) + 1;
     char* normalized = NEW_C_HEAP_ARRAY(char, len, mtLogging);
     if (!normalize_output_name(outputstr, normalized, len, errstream)) {
       return false;