--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/runtime/cds/appcds/OldClassTest.java	Thu Oct 17 20:53:35 2019 +0100
@@ -0,0 +1,161 @@
+/*
+ * Copyright (c) 2014, 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
+ * @summary classes with major version < JDK_6 (50) should not be included in CDS
+ * @requires vm.cds
+ * @library /test/lib
+ * @modules java.base/jdk.internal.org.objectweb.asm
+ *          jdk.jartool/sun.tools.jar
+ * @compile test-classes/Hello.java
+ * @run build TestCommon JarBuilder
+ * @run driver OldClassTest
+ */
+
+import java.io.File;
+import java.io.FileOutputStream;
+import jdk.test.lib.process.OutputAnalyzer;
+import java.nio.file.Files;
+
+import java.util.*;
+import jdk.internal.org.objectweb.asm.*;
+
+public class OldClassTest implements Opcodes {
+
+  public static void main(String[] args) throws Exception {
+    File jarSrcFile = new File(JarBuilder.getOrCreateHelloJar());
+
+    File dir = new File(System.getProperty("test.classes", "."));
+    File jarFile = new File(dir, "OldClassTest_old.jar");
+    String jar = jarFile.getPath();
+
+    if (!jarFile.exists() || jarFile.lastModified() < jarSrcFile.lastModified()) {
+      createTestJarFile(jarSrcFile, jarFile);
+    } else {
+      System.out.println("Already up-to-date: " + jarFile);
+    }
+
+    String appClasses[] = TestCommon.list("Hello");
+
+    // CASE 1: pre-JDK 6 compiled classes should be excluded from the dump
+    OutputAnalyzer output = TestCommon.dump(jar, appClasses);
+    TestCommon.checkExecReturn(output, 0, true, "Pre JDK 6 class not supported by CDS");
+
+    TestCommon.run(
+        "-cp", jar,
+        "Hello")
+      .assertNormalExit("Hello Unicode world (Old)");
+
+    // CASE 2: if we exlcude old version of this class, we should not pick up
+    //         the newer version of this class in a subsequent classpath element.
+    String classpath = jar + File.pathSeparator + jarSrcFile.getPath();
+    output = TestCommon.dump(classpath, appClasses);
+    TestCommon.checkExecReturn(output, 0, true, "Pre JDK 6 class not supported by CDS");
+
+    TestCommon.run(
+        "-cp", classpath,
+        "Hello")
+      .assertNormalExit("Hello Unicode world (Old)");
+  }
+
+  static void createTestJarFile(File jarSrcFile, File jarFile) throws Exception {
+    jarFile.delete();
+    Files.copy(jarSrcFile.toPath(), jarFile.toPath());
+
+    File dir = new File(System.getProperty("test.classes", "."));
+    File outdir = new File(dir, "old_class_test_classes");
+    outdir.delete();
+    outdir.mkdir();
+
+    writeClassFile(new File(outdir, "Hello.class"), makeOldHello());
+
+    JarBuilder.update(jarFile.getPath(), outdir.getPath());
+  }
+
+  static void writeClassFile(File file, byte bytecodes[]) throws Exception {
+    try (FileOutputStream fos = new FileOutputStream(file)) {
+        fos.write(bytecodes);
+      }
+  }
+
+/* makeOldHello() was obtained using JDK8. We use a method name > 128 that would
+   trigger a call to java.lang.Character.isJavaIdentifierStart() during class
+   file parsing.
+
+cat > Hello.java <<EOF
+public class Hello {
+    public static void main(String args[]) {
+        System.out.println(\u1234());
+    }
+    static String \u1234() {
+        return "Hello Unicode world (Old)";
+    }
+}
+EOF
+javac Hello.java
+java jdk.internal.org.objectweb.asm.util.ASMifier Hello.class
+
+ */
+
+  static byte[] makeOldHello() throws Exception {
+    ClassWriter cw = new ClassWriter(0);
+    FieldVisitor fv;
+    MethodVisitor mv;
+    AnnotationVisitor av0;
+
+      cw.visit(V1_5, ACC_PUBLIC + ACC_SUPER, "Hello", null, "java/lang/Object", null);
+
+    {
+      mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
+      mv.visitCode();
+      mv.visitVarInsn(ALOAD, 0);
+      mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
+      mv.visitInsn(RETURN);
+      mv.visitMaxs(1, 1);
+      mv.visitEnd();
+    }
+    {
+      mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "main", "([Ljava/lang/String;)V", null, null);
+      mv.visitCode();
+      mv.visitFieldInsn(GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;");
+      mv.visitMethodInsn(INVOKESTATIC, "Hello", "\u1234", "()Ljava/lang/String;", false);
+      mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V", false);
+      mv.visitInsn(RETURN);
+      mv.visitMaxs(2, 1);
+      mv.visitEnd();
+    }
+    {
+      mv = cw.visitMethod(ACC_STATIC, "\u1234", "()Ljava/lang/String;", null, null);
+      mv.visitCode();
+      mv.visitLdcInsn("Hello Unicode world (Old)");
+      mv.visitInsn(ARETURN);
+      mv.visitMaxs(1, 0);
+      mv.visitEnd();
+    }
+    cw.visitEnd();
+
+    return cw.toByteArray();
+  }
+}