Unable to run any Example due to a null in the Run

[xmppjingle]

It seems to fail bad here:
SipConfig sipConfig = new SipConfig();

With:
Exception in thread "main" java.lang.ExceptionInInitializerError
at org.mjsip.examples.MiniJukebox.main(MiniJukebox.java:79)
Caused by: java.lang.NullPointerException: inStream parameter is null
at java.base/java.util.Objects.requireNonNull(Objects.java:235)
at java.base/java.util.Properties.load(Properties.java:407)
at org.mjsip.sip.provider.SipStack.(SipStack.java:54)
... 1 more

[haumacher]

I think this can only happen, if you build the project without a Maven builder. However, I added some safety code, that prevents to fail the hard way, when doing so. Could you re-test?