--- /dev/null	2017-05-17 16:11:12.000000000 +0100
+++ new/test/java/lang/System/refreshEnv/librefreshEnv.c	2017-05-17 16:11:12.000000000 +0100
@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+#ifdef WINDOWS
+#include <windows.h>
+#else
+#include <stdlib.h>
+#endif
+
+#include <jni.h>
+
+void throwByName(JNIEnv *env, const char *name, const char *msg)
+ {
+     jclass cls = (*env)->FindClass(env, name);
+
+     if (cls != 0)
+         (*env)->ThrowNew(env, cls, msg);
+ }
+
+
+JNIEXPORT void JNICALL
+Java_RefreshEnv_setenv(JNIEnv *env, jclass unused, jstring name, jstring value)
+{
+    const char* cname;
+    const char* cvalue;
+
+    cname = (*env)->GetStringUTFChars(env, name, NULL);
+    if (cname == NULL) {
+        return;
+    }
+
+    cvalue = (*env)->GetStringUTFChars(env, value, NULL);
+    if (cvalue == NULL) {
+        (*env)->ReleaseStringUTFChars(env, name, cname);
+        return;
+    }
+
+#ifdef WINDOWS
+    if (!SetEnvironmentVariable(cname, cvalue)) {
+#else
+    if (setenv(cname, cvalue, 1) != 0) {
+#endif
+        throwByName(env, "java/lang/Exception", "setenv failed");
+    }
+
+    (*env)->ReleaseStringUTFChars(env, name, cname);
+    (*env)->ReleaseStringUTFChars(env, name, cvalue);
+
+    return;
+}