[447816] - ServletHolder#compareTo not transitive

Updating compareTo to properly order when one _className is null and the other is not.

Signed-off-by: Matt Gilman <matt.c.gilman@gmail.com>

jetty-servlet/src/main/java/org/eclipse/jetty/servlet/ServletHolder.java

@@ -208,15 +208,29 @@ public class ServletHolder extends Holder<Servlet> implements UserIdentity.Scope
     {
         if (sh==this)
             return 0;
+
         if (sh._initOrder<_initOrder)
             return 1;
+
         if (sh._initOrder>_initOrder)
             return -1;
 
-        int c=(_className!=null && sh._className!=null)?_className.compareTo(sh._className):0;
+        // consider _className, need to position properly when one is configured but not the other
+        int c;
+        if (_className==null && sh._className==null)
+            c=0;
+        else if (_className==null)
+            c=-1;
+        else if (sh._className==null)
+            c=1;
+        else
+            c=_className.compareTo(sh._className);
+
+        // if _initOrder and _className are the same, consider the _name
         if (c==0)
             c=_name.compareTo(sh._name);
-            return c;
+
+        return c;
     }
 
     /* ------------------------------------------------------------ */

jetty-servlet/src/test/java/org/eclipse/jetty/servlet/ServletHolderTest.java

@@ -0,0 +1,55 @@
+//
+//  ========================================================================
+//  Copyright (c) 1995-2015 Mort Bay Consulting Pty. Ltd.
+//  ------------------------------------------------------------------------
+//  All rights reserved. This program and the accompanying materials
+//  are made available under the terms of the Eclipse Public License v1.0
+//  and Apache License v2.0 which accompanies this distribution.
+//
+//      The Eclipse Public License is available at
+//      http://www.eclipse.org/legal/epl-v10.html
+//
+//      The Apache License v2.0 is available at
+//      http://www.opensource.org/licenses/apache2.0.php
+//
+//  You may elect to redistribute this code under either of these licenses.
+//  ========================================================================
+//
+
+package org.eclipse.jetty.servlet;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.Arrays;
+import java.util.Collections;
+
+public class ServletHolderTest {
+
+    @Test
+    public void testTransitiveCompareTo() throws Exception
+    {
+        // example of jsp-file referenced in web.xml
+        final ServletHolder one = new ServletHolder();
+        one.setInitOrder(-1);
+        one.setName("Login");
+        one.setClassName(null);
+
+        // example of pre-compiled jsp
+        final ServletHolder two = new ServletHolder();
+        two.setInitOrder(-1);
+        two.setName("org.my.package.jsp.WEB_002dINF.pages.precompiled_002dpage_jsp");
+        two.setClassName("org.my.package.jsp.WEB_002dINF.pages.precompiled_002dpage_jsp");
+
+        // example of servlet referenced in web.xml
+        final ServletHolder three = new ServletHolder();
+        three.setInitOrder(-1);
+        three.setName("Download");
+        three.setClassName("org.my.package.web.DownloadServlet");
+
+        // verify compareTo transitivity
+        Assert.assertTrue(one.compareTo(two) < 0);
+        Assert.assertTrue(two.compareTo(three) < 0);
+        Assert.assertTrue(one.compareTo(three) < 0);
+    }
+}