--- old/src/share/vm/prims/jni.cpp	2014-04-03 14:47:14.287703528 +0200
+++ new/src/share/vm/prims/jni.cpp	2014-04-03 14:47:14.066970107 +0200
@@ -3150,11 +3150,9 @@
   } else {
     //%note jni_7
     if (len > 0) {
-      ResourceMark rm(THREAD);
-      char *utf_region = java_lang_String::as_utf8_string(s, start, len);
-      int utf_len = (int)strlen(utf_region);
-      memcpy(buf, utf_region, utf_len);
-      buf[utf_len] = 0;
+      // Assume the buffer is large enough as the JNI spec. does not require user error checking
+      java_lang_String::as_utf8_string(s, start, len, buf, INT_MAX);
+      // as_utf8_string null-terminates the result string
     } else {
       // JDK null-terminates the buffer even in len is zero
       if (buf != NULL) {