--- old/src/java.base/share/classes/sun/net/www/protocol/jar/JarURLConnection.java	2015-05-18 18:36:21.491765393 -0700
+++ new/src/java.base/share/classes/sun/net/www/protocol/jar/JarURLConnection.java	2015-05-18 18:36:21.363765398 -0700
@@ -29,10 +29,12 @@
 import java.io.IOException;
 import java.io.FileNotFoundException;
 import java.io.BufferedInputStream;
+import java.io.ByteArrayInputStream;
 import java.net.URL;
 import java.net.URLConnection;
 import java.net.MalformedURLException;
 import java.net.UnknownServiceException;
+import java.nio.ByteBuffer;
 import java.util.Enumeration;
 import java.util.Map;
 import java.util.List;
@@ -53,6 +55,9 @@
      */
     private static final JarFileFactory factory = JarFileFactory.getInstance();
 
+    private static final sun.misc.JavaUtilZipFileAccess zipAccess
+            = sun.misc.SharedSecrets.getJavaUtilZipFileAccess();
+
     /* the url for the Jar file */
     private URL jarFileURL;
 
@@ -159,7 +164,16 @@
                                                 " not found in " +
                                                 jarFile.getName());
             }
-            result = new JarURLInputStream (jarFile.getInputStream(jarEntry));
+            long size = jarEntry.getSize();
+            if (size > 0 && size < 512 * 1024) {
+                byte[] bytes = new byte[(int) size];
+                ByteBuffer bb = ByteBuffer.wrap(bytes);
+                zipAccess.fillByteBuffer(jarFile, jarEntry, bb);
+                result = new JarURLInputStream(new ByteArrayInputStream(bytes, 0, bb.position()));
+            } else {
+                // Unknown or too large ZipEntry size to use a array
+                result = new JarURLInputStream(jarFile.getInputStream(jarEntry));
+            }
         }
         return result;
     }