After some more testing I found a solution (or more a work around)
When I open and close the com port with this code before calling the go 
method

CommPortIdentifier identifier = 
CommPortIdentifier.getPortIdentifier("/dev/IOIO0");
CommPort commPort = identifier.open(*"*IOIO*"*, 2000);

commPort.close(); 

it works immediately after boot. But only with firmware 0500.

With firmware 0506 it works only after disconnect / reconnect USB

It looks like if it is the same problem that "Al Linke" described her: 
https://groups.google.com/forum/#!topic/ioio-users/owX8Zqb2Nj0
He also mentioned that it works only after the second start of the 
application.

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