Replaced String#isEmpty with String#trim#size > 0. It now compiles in Java 5 again.

git-svn-id: http://svn.igniterealtime.org/svn/repos/openfire/trunk@9296 b35dd754-fafc-0310-a699-88a17e54d16e

src/java/org/jivesoftware/openfire/muc/spi/LocalMUCUser.java

@@ -237,7 +237,7 @@ public class LocalMUCUser implements MUCUser {
                     try {
                         if (packet.getSubject() != null && packet.getSubject().trim().length() > 0 &&
                                 Message.Type.groupchat == packet.getType() &&
-                                (packet.getBody() == null || packet.getBody().trim().isEmpty())) {
+                                (packet.getBody() == null || packet.getBody().trim().length() == 0)) {
                             // An occupant is trying to change the room's subject
                             role.getChatRoom().changeSubject(packet, role);
 

src/java/org/jivesoftware/openfire/net/SASLAuthentication.java

@@ -213,7 +213,7 @@ public class SASLAuthentication {
                                     new XMPPCallbackHandler());
                             // evaluateResponse doesn't like null parameter
                             byte[] token = new byte[0];
-                            if (!doc.getText().isEmpty()) {
+                            if (doc.getText().length() > 0) {
                                 // If auth request includes a value then validate it
                                 token = StringUtils.decodeBase64(doc.getText().trim());
                                 if (token == null) {