--- old/src/java.desktop/share/classes/com/sun/imageio/plugins/gif/GIFImageWriter.java	2016-10-04 16:22:24.996503172 +0530
+++ new/src/java.desktop/share/classes/com/sun/imageio/plugins/gif/GIFImageWriter.java	2016-10-04 16:22:24.532503172 +0530
@@ -1314,7 +1314,7 @@
         super(locale);
         this.canWriteCompressed = true;
         this.canWriteProgressive = true;
-        this.compressionTypes = new String[] {"LZW", "lzw"};
+        this.compressionTypes = new String[] {"LZW"};
         this.compressionType = compressionTypes[0];
     }
 
--- /dev/null	2016-10-03 15:38:35.548065000 +0530
+++ new/test/javax/imageio/plugins/gif/GIFCompressionTypesTest.java	2016-10-04 16:22:25.820503172 +0530
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2016, 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     6294607
+  * @summary Test verifies whether getCompressionTypes() returns only one
+  *          compression type(LZW) for GIF and not more than that.
+  * @run     main GIFCompressionTypesTest
+  */
+
+import java.util.Iterator;
+import javax.imageio.ImageIO;
+import javax.imageio.ImageWriteParam;
+import javax.imageio.ImageWriter;
+
+public class GIFCompressionTypesTest {
+
+    static ImageWriter writer = null;
+
+    public static void main(String args[]) {
+        Iterator it = ImageIO.getImageWritersByFormatName("gif");
+        while (it.hasNext()) {
+            writer = (ImageWriter) it.next();
+            break;
+        }
+        ImageWriteParam param = writer.getDefaultWriteParam();
+
+        param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
+        String compTypes[] = param.getCompressionTypes();
+        // In GIF we support only one compression type : LZW
+        if (compTypes.length != 1) {
+            throw new RuntimeException("We support only one compression"
+                    + " type in GIF : LZW");
+        }
+    }
+}
+