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I downloaded Vaadin source code from GitHub yesterday and tried to build it, but tests are not taking into account default JVM locale (in my case it is pl_PL). For example assertion in BinderBookOfVaadinTest#converterBookOfVaadinExample1 on line 270: Assert.assertEquals("1,972", yearOfBirthField.getValue()); is causing the problem. Why? In my language thousand separator is non-breaking space. Therefore yearOfBirthField.getValue() returns "1 972". Using -Duser.language=en -Duser.region=US flags for maven build completes successfully.