I tried to run corba sample code from professioan Java Programming; but after I typed java
chat.corba.CORBAClient, I got a NullPointerException:
Exception in thread "main" java.lang.NullPointerException
at chat.corba.ServerProxy.getHistory(ServerProxy.java:22)
at chat.BaseClient.displayHistory(BaseClient.java:68)
at chat.corba.CORBAClient.<init>(CORBAClient.java;33)
at chat.corba.CORBAClient.main(CORBAClient.java:18)

Anybody who bought that book has any idea?  Thanks.

Howard.