[SIPForum-discussion] Problems with processing incoming SIP requests

[Bayram Kıran]

Hi to all,

Now, we are trying to send instant messages with the textclient project
which can be downloaded from "
http://www.oracle.com/technology/pub/articles/dev2arch/2007/10/textclient.zip
".
Although i can send instant messages to my friend's computer succesfully(see
success.png), he can not send me or my computer can not process the incoming
request. Some error messages are printed to my terminal.

java.lang.NullPointerException
    at
gov.nist.javax.sip.stack.UDPMessageChannel.sendMessage(UDPMessageChannel.java:683)
    at
gov.nist.javax.sip.stack.UDPMessageChannel.processIncomingDataPacket(UDPMessageChannel.java:323)
    at
gov.nist.javax.sip.stack.UDPMessageChannel.run(UDPMessageChannel.java:255)
    at java.lang.Thread.run(Thread.java:619)

The source code , jdk and jre are identical on my computer and my friend's
computer. Why do i get this error while my friend does not get the error?
We need urgent help, thanks ...

Best regards
Bayram Kıran and Yalçın Yıldız
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