--- /dev/null	2018-11-26 11:49:18.255023023 +0100
+++ new/test/hotspot/jtreg/gc/shenandoah/jni/libTestJNIGlobalRefs.c	2018-11-26 21:30:39.208789663 +0100
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2018, Red Hat, Inc. All rights reserved.
+ *
+ * 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.
+ *
+ */
+
+#include <jni.h>
+#include <string.h>
+
+jobject global_ref = NULL;
+jobject weak_global_ref = NULL;
+
+JNIEXPORT void JNICALL
+Java_TestJNIGlobalRefs_makeGlobalRef(JNIEnv *env, jclass unused, jobject o) {
+  global_ref = (*env)->NewGlobalRef(env, o);
+}
+
+JNIEXPORT void JNICALL
+Java_TestJNIGlobalRefs_makeWeakGlobalRef(JNIEnv *env, jclass unused, jobject o) {
+  weak_global_ref = (*env)->NewWeakGlobalRef(env, o);
+}
+
+JNIEXPORT jobject JNICALL
+Java_TestJNIGlobalRefs_readGlobalRef(JNIEnv *env, jclass unused) {
+  return global_ref;
+}
+
+JNIEXPORT jobject JNICALL
+Java_TestJNIGlobalRefs_readWeakGlobalRef(JNIEnv *env, jclass unused) {
+  return weak_global_ref;
+}