--- a/src/java.base/share/classes/java/lang/constant/MethodTypeDescImpl.java	Tue Jun 25 09:41:03 2019 -0700
+++ b/src/java.base/share/classes/java/lang/constant/MethodTypeDescImpl.java	Tue Jun 25 18:21:21 2019 -0400
@@ -131,8 +131,14 @@
     }
 
     @Override
-    public MethodType resolveConstantDesc(MethodHandles.Lookup lookup) {
-        return MethodType.fromMethodDescriptorString(descriptorString(), lookup.lookupClass().getClassLoader());
+    public MethodType resolveConstantDesc(MethodHandles.Lookup lookup) throws ReflectiveOperationException {
+        MethodType mtype = MethodType.fromMethodDescriptorString(descriptorString(), lookup.lookupClass().getClassLoader());
+        // let's check that the lookup has access to all the types in the method type
+        lookup.accessClass(mtype.returnType());
+        for (Class<?> paramType: mtype.parameterArray()) {
+            lookup.accessClass(paramType);
+        }
+        return mtype;
     }
 
     /**

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/java/lang/constant/access_test/pkg1/MethodTypeDescriptorAccessTest.java	Tue Jun 25 18:21:21 2019 -0400
@@ -0,0 +1,88 @@
+/*
+ * Copyright (c) 2019, 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.
+ */
+
+/*
+ * @test
+ * @bug 8226709
+ * @summary MethodTypeDesc::resolveConstantDesc needs access check per the specification
+ * @compile ../pkg2/PublicClass.java ../pkg2/NonPublicClass.java
+ * @run main pkg1.MethodTypeDescriptorAccessTest
+ */
+
+package pkg1;
+
+import java.lang.invoke.*;
+import java.lang.invoke.MethodType;
+import java.lang.constant.*;
+
+import static java.lang.invoke.MethodHandles.*;
+import static java.lang.invoke.MethodHandles.Lookup.*;
+import static java.lang.invoke.MethodType.*;
+
+public class MethodTypeDescriptorAccessTest {
+    public static void main(String... args) throws Throwable {
+        new MethodTypeDescriptorAccessTest().test();
+    }
+
+    void test() {
+        Lookup selfLookup = MethodHandles.lookup();
+        //first test PublicClass
+        String descriptorpub = "(Lpkg2/PublicClass;)Lpkg2/PublicClass;";
+        MethodTypeDesc mtdpub = MethodTypeDesc.ofDescriptor(descriptorpub);
+        checkValidAccess(mtdpub, selfLookup);
+
+        // test NonPublicClass in the return type
+        String descriptornp = "()Lpkg2/NonPublicClass;";
+        MethodTypeDesc mtdnp = MethodTypeDesc.ofDescriptor(descriptornp);
+        checkInvalidAccess(mtdnp, selfLookup);
+
+        // test NonPublicClass in the parameters
+        descriptornp = "(Lpkg2/NonPublicClass;)I";
+        mtdnp = MethodTypeDesc.ofDescriptor(descriptornp);
+        checkInvalidAccess(mtdnp, selfLookup);
+
+        MethodType mt = MethodType.fromMethodDescriptorString("(Lpkg2/NonPublicClass;)I", selfLookup.lookupClass().getClassLoader());
+    }
+
+    private void checkValidAccess(MethodTypeDesc mtd, Lookup lookup) {
+        try {
+            MethodType mt = (MethodType)mtd.resolveConstantDesc(lookup);
+        } catch (ReflectiveOperationException unexpected) {
+            throw new Error("resolveConstantDesc() threw ReflectiveOperationException unexpectedly with cause " +
+                    unexpected.getCause() + " for " + mtd);
+        }
+    }
+
+    private void checkInvalidAccess(MethodTypeDesc mtd, Lookup lookup) {
+        try {
+            MethodType mt = (MethodType)mtd.resolveConstantDesc(lookup);
+            throw new Error("resolveConstantDesc() succeeded unexpectedly " + mtd);
+        } catch (ReflectiveOperationException expected) {
+            if (expected.getClass() != IllegalAccessException.class) {
+                throw new Error("resolveConstantDesc() threw unexpected ReflectiveOperationException with cause " +
+                        expected.getCause() + " for " + mtd);
+            }
+        }
+    }
+
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/java/lang/constant/access_test/pkg2/NonPublicClass.java	Tue Jun 25 18:21:21 2019 -0400
@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2019, 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.
+ */
+
+package pkg2;
+
+class NonPublicClass {}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/java/lang/constant/access_test/pkg2/PublicClass.java	Tue Jun 25 18:21:21 2019 -0400
@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2019, 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.
+ */
+
+package pkg2;
+
+public class PublicClass {}