I may have forgotten checking "ActiveX and Socket Clients" in the first try.
Now I've made it from the terminal.
$ ./PosixSocketClientTest
Start of POSIX Socket Client Test 0
Attempt 1 of 50
Connecting to 127.0.0.1:7496 clientId:0
Connected to 127.0.0.1:7496 clientId:0
Placing Order 1: BUY 1000 IBM at 0.010000
Order: id=1, status=Submitted
Cancelling Order 1
Order: id=1, status=Cancelled
Requesting Current Time
The current date/time is: Sun May 22 10:22:45 2016
^C
Setting up API connection by Eclipse is still to be done.
Thank you.