[kura-dev] NoClassDefFoundError on Kura 1.1.0 using Modbus example

[Alessandro Da Rugna <alessandro.darugna@xxxxxxxxx>]

I am trying to connect to a Modbus device using a serial connection on
Kura 1.1.0 with modbus bundle.
My bundle runs fine on the emulator and the Modbus hardware responds.
When deploying my bundle in a running instance of Kura I get the
following `NoClassDefFoundError`.
I checked the modbus example provided in
kura/examples/org.eclipse.kura.demo.modbus and I get the same error.
To run the example as I need I changed 'isTCP' variable on line 30 to
false and added two properties
prop.setProperty("transmissionMode", "RTU");
prop.setProperty("respTimeout", "700");
in the modbus properties on line 218.
The connection is not instantiated and I get the same error.
Which import am I missing? I can't figure it out since it works in the emulator.

org.eclipse.kura.protocol.modbus.ModbusProtocolException: Generic
Error - CONNECTION_FAILURE: {1} {2} {3} {4} {5} null
at org.eclipse.kura.protocol.modbus.ModbusProtocolDevice$SerialCommunicate.<init>(ModbusProtocolDevice.java:377)
at org.eclipse.kura.protocol.modbus.ModbusProtocolDevice.configureConnection(ModbusProtocolDevice.java:233)
at org.eclipse.kura.demo.modbus.ModbusExample.configureDevice(ModbusExample.java:149)
at org.eclipse.kura.demo.modbus.ModbusExample.doModbusLoop(ModbusExample.java:110)
at org.eclipse.kura.demo.modbus.ModbusExample.access$0(ModbusExample.java:105)
at org.eclipse.kura.demo.modbus.ModbusExample$1.run(ModbusExample.java:56)
at java.lang.Thread.run(Thread.java:724)
Caused by: java.io.IOException: java.lang.NoClassDefFoundError: Could
not initialize class javax.comm.CommPortIdentifier
at org.eclipse.kura.core.comm.CommConnectionFactory.createConnection(CommConnectionFactory.java:62)
at org.eclipse.kura.protocol.modbus.ModbusProtocolDevice$SerialCommunicate.<init>(ModbusProtocolDevice.java:375)
... 6 more
Caused by: java.lang.NoClassDefFoundError: Could not initialize class
javax.comm.CommPortIdentifier
at org.eclipse.kura.core.comm.CommConnectionImpl.<init>(CommConnectionImpl.java:85)
at org.eclipse.kura.core.comm.CommConnectionFactory.createConnection(CommConnectionFactory.java:59)
... 7 more

Thank you,

  Alessandro