Problem with the last JAIN version ...

Good Morning,

I have been working with an old version of NIST/JAIN and my app worked
fine ...

Now I have downloaded the last version from https://jain-sip.dev.java.net/,
made the required changes to may app but I can't initialize the SipFactory,
I get the following exception:

The Peer SIP Stack: gov.nist.javax.sip.SipStackImpl could not be 
instantiated. Ensure the Path Name has been set.
javax.sip.PeerUnavailableException: The Peer SIP Stack: 
gov.nist.javax.sip.SipStackImpl could not be instantiated. Ensure the Path 
Name has been set.
	at javax.sip.SipFactory.createStack(SipFactory.java:320)
	at javax.sip.SipFactory.createSipStack(SipFactory.java:159)
	at loquendo.sip.client.SipGeneralFactory.init(SipGeneralFactory.java:127)
	at loquendo.dp.DPSessionsManager.<init>(DPSessionsManager.java:126)
	at loquendo.vxml.interpreter.Main.<init>(Main.java:390)
	at loquendo.vxml.interpreter.Main.main(Main.java:665)
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown 
Source)
	at java.lang.reflect.Constructor.newInstance(Unknown Source)
	at javax.sip.SipFactory.createStack(SipFactory.java:310)
	... 5 more

Caused by: java.lang.NoClassDefFoundError: 
EDU/oswego/cs/dl/util/concurrent/ConcurrentHashMap
	at 
gov.nist.javax.sip.stack.SIPTransactionStack.<init>(SIPTransactionStack.java:322)
	at gov.nist.javax.sip.SipStackImpl.<init>(SipStackImpl.java:230)
	at gov.nist.javax.sip.SipStackImpl.<init>(SipStackImpl.java:271)
	... 10 more

what is this EDU/oswego/cs/dl/util/ ... etc. not found? I obviously had a 
look at the examples,
but it seems that the properties are set correctly (on the other hand, with 
the old stack
anything works fine) ...

does anyone have a clue?

thanks in advance :)

Bruno