I use Scala with Simple Build Tool (SBT). Have created a project and copied the JForex libs in the lib folder. I have after that writte in the src/main/scala folder a simple file called SForex.scala:
import com.dukascopy.api.Instrument
import com.dukascopy.api.system.IClient
import com.dukascopy.api.system.ClientFactory
import com.dukascopy.api.system.ISystemListener
import java.util.HashSet
import org.slf4j.LoggerFactory
object SForex {
def main(args: Array[String]) {
// Arguments
var username = "XXX"
var password = "XXX"
// Initialize the logger.
val log = LoggerFactory.getLogger(getClass)
org.apache.log4j.BasicConfigurator.configure
// Get default instance of Dukascopy IClient
val client = ClientFactory.getDefaultInstance
// Create system listener
val systemListener = new ISystemListener {
var maxReconnects = 3
override def onConnect {
log.info("[network] connected on dukascopy server")
println("[network] connected on dukascopy server")
maxReconnects = 3
}
override def onDisconnect {
log.warn("[network] disconnected from dukascopy server")
println("[network] disconnected from dukascopy server")
if (maxReconnects > 0) {
client.reconnect
maxReconnects = maxReconnects - 1
} else {
try {
Thread.sleep(10000)
} catch {
case e:InterruptedException => //ignore
}
try {
client.connect("https://www.dukascopy.com/client/demo/jclient/jforex.jnlp", username, password)
} catch {
case e:Exception => {
log.error(e.getMessage(), e)
println(e.getMessage(), e)
}
}
}
}
override def onStart(processId: Long) {
log.info("[strategy] started process id: " + processId)
println("[strategy] started process id: " + processId)
}
override def onStop(processId: Long) {
log.info("[strategy] stopped process id: " + processId)
println("[strategy] stopped process id: " + processId)
if (client.getStartedStrategies.size == 0)
exit(0)
}
}
// Set system listener
client.setSystemListener(systemListener)
// Connect to Dukascopy
log.info("[network] connecting to dukascopy server...")
println("[network] connecting to dukascopy server...")
client.connect("https://www.dukascopy.com/client/demo/jclient/jforex.jnlp", username, password)
// Wait of Dukascopy response
var maxSeconds = 10
while (maxSeconds > 0 && !client.isConnected) {
Thread.sleep(1000)
maxSeconds = maxSeconds - 1
}
// If not connected, exit
if (!client.isConnected()) {
log.error("[network] failed to connect dukascopy servers")
println("[network] failed to connect dukascopy servers")
exit(1)
}
//now it's running
exit(0)
}
}
If the code passed the last row resp. comment "now it's running", the exit(0) function don't stop the whole application (hang up). I have read in this topic
viewtopic.php?f=5&t=2672&view=previous that ISystemListener use own thread. It's possible kill this thread? And if yes, can the console application after that shutdown normal or should I kill additional another thread?
In another words, I need an advice how a console Application based on JForex API can shutdown normal without Ctrl+C
). A great benefit in Scala is the very compact code, simple Thread coding with Actors and you have access of all Java packages. If you write Scala and know Java, you missing nothing 
And in combination with the LiftWeb Framework, you have easy interface to third party databases like PostgreSQL or others. And for communication with another software components you can use simple JMS about ActiveMQ. One of the negative side of Scala is the often changes in the API and language too, because Scala is young. But I can't judge whether Scala is ideal for financial system, except that for me it's the right language.