On Eclipse you have to add jl1.0.jar to your Java Build Path.
On your shell you can start the runnable JAR file:
java -jar tts.jar "<language>" "<text>"
java -jar tts.jar "En-us" "It works! Foo!"
I think there are all languages available. For example: En-us, DE-de, ...
You can get the lastest runnable Jar file
Feel free to send me a message!