Detect buffers with "empty" content and just delete "empty" content. JM-1088

git-svn-id: http://svn.igniterealtime.org/svn/repos/openfire/branches@8603 b35dd754-fafc-0310-a699-88a17e54d16e

3_3_1_branch/src/java/org/jivesoftware/openfire/nio/XMLLightweightParser.java

@@ -156,6 +156,14 @@ class XMLLightweightParser {
         char[] buf = charBuffer.array();
 
         buffer.append(buf);
+        // Do nothing if the buffer only contains white spaces
+        if (' ' == buffer.charAt(0) && ' ' == buffer.charAt(buffer.length()-1)) {
+            if ("".equals(buffer.toString().trim())) {
+                // Empty the buffer so there is no memory leak
+                buffer.delete(0, buffer.length());
+                return;
+            }
+        }
         // Robot.
         char ch;
         for (int i = 0; i < readByte; i++) {