ChatBean Topic version doesn't work

[edward]

Hi, ALL,

I modified ChatBean source code in the example to Topic, but it doesn't 
work. Looks like the ChatBean is not looked up successfully .

File 1: http://www.mediafire.com/file/9helr4n8z25xq0y/ChatBean.java
File 2: 
http://www.mediafire.com/file/w0d018r1xojzwjt/MessagingClientBean.java
File 3: 
http://www.mediafire.com/file/7cv4l9kvy3a2yzm/MessagingClientBeanRemote.java
File 4: http://www.mediafire.com/file/6ybp8l7pov9u7da/Test.java

Any clues ?

Thanks.
Edward