JAXB exception messages: How to change language?

During XML validation against an XSD file using JAXB I get JAXBExceptions in case of invalid XML files. I get the message of the exceptions by calling event.getMessage(). The resulting string is in german language.

I'm using JAXB 2.2. with java 8 on a german system.

What determines the language for the JAXB exception messages and how can I change it to english?

Here's the code:

SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
try {
    Schema schema = schemaFactory.newSchema();
    JAXBContext jaxbContext = JAXBContext.newInstance("myPackage");
    Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
    unmarshaller.setEventHandler(new XMLValidationEventHandler());
    unmarshaller.setSchema(schema);
    myClass = (myClass) unmarshaller.unmarshal(new File("myFile.xml"));

} catch (SAXException saxE) {
    System.out.println("SAX-Exception during creation of Schema object!");
    saxE.printStackTrace();
} catch (JAXBException e) {}

And this is the Event-Handler:

public class XMLValidationEventHandler implements ValidationEventHandler {

@Override
public boolean handleEvent(ValidationEvent event) {
    System.out.println("XML validation failure in line " 
                       + event.getLocator().getLineNumber() 
                       + ", column " + event.getLocator().getColumnNumber() 
                       + ": " + event.getMessage());
    return true;
}

Here is an example of the output of the event handler:

XML validation failure in line 8, column 48: cvc-maxInclusive-valid: Wert "10000" ist nicht Facet-gültig in Bezug auf maxInclusive "8.0E3" für Typ "Type".
XML validation failure in line 17, column 64: Ungültiger Wert 250 für Feld Day.
XML validation failure in line 17, column 64: cvc-datatype-valid.1.2.1: "2014-02-2501:00:00Z" ist kein gültiger Wert für "dateTime".

OK, I found out that the language used for the JAXB event messages is determined by the java system property user.language. The default language is therefore dependent on the system it runs on.

I changed the run configuration of my java program by adding -Duser.language=en. This changed the language of the JAXB event messages to english.