Examples not working if running with a locale different from en

[cecchisandrone]

I'm running examples on a machine with italian locale and examples don't work. In particular, MockDataProducer is not able to generate data, due to the generation with a different decimal separator. This is the stacktrace:

java.lang.NumberFormatException: For input string: "262,00"
	at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:2043)
	at sun.misc.FloatingDecimal.parseDouble(FloatingDecimal.java:110)
	at java.lang.Double.parseDouble(Double.java:538)
	at bbejeck.util.datagen.DataGenerator.generatePurchases(DataGenerator.java:96)
	at bbejeck.clients.producer.MockDataProducer.lambda$producePurchaseData$0(MockDataProducer.java:68)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266)
	at java.util.concurrent.FutureTask.run(FutureTask.java)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

Also it has been very hard to debug since that code is wrapped in a task run with ExecutorService and exception is not thrown.
The solution anyway is to add the following JVM parameters: -Duser.country=US -Duser.language=en