--- a/src/java.base/share/classes/java/util/jar/JarFile.java	Fri Mar 30 08:37:31 2018 +0530
+++ b/src/java.base/share/classes/java/util/jar/JarFile.java	Wed Apr 04 13:55:30 2018 -0700
@@ -1011,29 +1011,13 @@
                     int i = match(MULTIRELEASE_CHARS, b, MULTIRELEASE_LASTOCC,
                             MULTIRELEASE_OPTOSFT);
                     if (i != -1) {
-                        i += MULTIRELEASE_CHARS.length;
-                        if (i < b.length) {
-                            byte c = b[i++];
-                            // Check that the value is followed by a newline
-                            // and does not have a continuation
-                            if (c == '\n' &&
-                                    (i == b.length || b[i] != ' ')) {
-                                isMultiRelease = true;
-                            } else if (c == '\r') {
-                                if (i == b.length) {
-                                    isMultiRelease = true;
-                                } else {
-                                    c = b[i++];
-                                    if (c == '\n') {
-                                        if (i == b.length || b[i] != ' ') {
-                                            isMultiRelease = true;
-                                        }
-                                    } else if (c != ' ') {
-                                        isMultiRelease = true;
-                                    }
-                                }
-                            }
-                        }
+                        // Read the main attributes of the manifest
+                        byte[] lbuf = new byte[512];
+                        Attributes attr = new Attributes();
+                        attr.read(new Manifest.FastInputStream(
+                            new ByteArrayInputStream(b)), lbuf);
+                        isMultiRelease = Boolean.parseBoolean(
+                            attr.getValue(Attributes.Name.MULTI_RELEASE));
                     }
                 }
             }

--- a/test/jdk/java/util/jar/JarFile/mrjar/MultiReleaseJarAPI.java	Fri Mar 30 08:37:31 2018 +0530
+++ b/test/jdk/java/util/jar/JarFile/mrjar/MultiReleaseJarAPI.java	Wed Apr 04 13:55:30 2018 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2015, 2018, 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
@@ -23,7 +23,7 @@
 
 /*
  * @test
- * @bug 8132734 8144062 8165723
+ * @bug 8132734 8144062 8165723 8199172
  * @summary Test the extended API and the aliasing additions in JarFile that
  *          support multi-release jar files
  * @library /lib/testlibrary/java/util/jar /test/lib
@@ -100,16 +100,30 @@
         testCustomMultiReleaseValue("true", true);
         testCustomMultiReleaseValue("true\r\nOther: value", true);
         testCustomMultiReleaseValue("true\nOther: value", true);
-        testCustomMultiReleaseValue("true\rOther: value", true);
+        // JDK-8200530: '\r' support in Manifest/Attributes will be addressed separately
+        // testCustomMultiReleaseValue("true\rOther: value", true);
 
         testCustomMultiReleaseValue("false", false);
         testCustomMultiReleaseValue(" true", false);
         testCustomMultiReleaseValue("true ", false);
-        testCustomMultiReleaseValue("true\n ", false);
-        testCustomMultiReleaseValue("true\r ", false);
         testCustomMultiReleaseValue("true\n true", false);
+
+        // JDK-8200530: '\r' support in Manifest/Attributes will be addressed separately
+        testCustomMultiReleaseValue("true\r true", false);
         testCustomMultiReleaseValue("true\r\n true", false);
 
+        // "Multi-Release: true/false" not in main attributes
+        testCustomMultiReleaseValue("\r\n\r\nName: test\r\nMulti-Release: true\r\n",
+                                    false);
+        testCustomMultiReleaseValue("\n\nName: entryname\nMulti-Release: true\n",
+                                    false);
+        testCustomMultiReleaseValue("EndOfMainAttr: whatever\r\n" +
+                                    "\r\nName: entryname\r\nMulti-Release: true\r\n",
+                                    false);
+        testCustomMultiReleaseValue("EndOfMainAttr: whatever\r\n" +
+                                    "\nName: entryname\nMulti-Release: true\n",
+                                    false);
+
         // generate "random" Strings to use as extra attributes, and
         // verify that Multi-Release: true is always properly matched
         for (int i = 0; i < 100; i++) {

--- a/test/jdk/lib/testlibrary/java/util/jar/CreateMultiReleaseTestJars.java	Fri Mar 30 08:37:31 2018 +0530
+++ b/test/jdk/lib/testlibrary/java/util/jar/CreateMultiReleaseTestJars.java	Wed Apr 04 13:55:30 2018 -0700
@@ -142,6 +142,12 @@
     }
 
     public void buildSignedMultiReleaseJar() throws Exception {
+        buildSignedMultiReleaseJar("multi-release.jar", "signed-multi-release.jar");
+    }
+
+    public void buildSignedMultiReleaseJar(String multiReleaseJar,
+                                           String signedMultiReleaseJar) throws Exception
+    {
         String testsrc = System.getProperty("test.src",".");
         String testdir = findTestDir(testsrc);
         String keystore = testdir + "/sun/security/tools/jarsigner/JarSigning.keystore";
@@ -155,8 +161,8 @@
         CertPath cp = CertificateFactory.getInstance("X.509")
                 .generateCertPath(Arrays.asList(ks.getCertificateChain("b")));
         JarSigner js = new JarSigner.Builder(pkb, cp).build();
-        try (ZipFile in = new ZipFile("multi-release.jar");
-             FileOutputStream os = new FileOutputStream("signed-multi-release.jar"))
+        try (ZipFile in = new ZipFile(multiReleaseJar);
+             FileOutputStream os = new FileOutputStream(signedMultiReleaseJar))
         {
             js.sign(in, os);
         }