JAXB exception messages: How to change language?

Question

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".

Theme

Please post the code sample used to get the message, and the exact output if possible. – Hectograph

Answer 1

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.

Theme

Is there a way to to set the Locale just for the current JAXB context, without changing the default Locale for the whole JVM? I tried setting property "apache.org/xml/properties/locale" when creating the JAXBContext, but that throws an exception. It is not propagated to the underlying SaxParser. – Kozhikode

@fuemf5, see my answer. – Shorthorn

Answer 2

You should use a validator to validate, not unmarshaller. You can change its locale like this:

import javax.xml.validation.Validator;
import com.sun.org.apache.xerces.internal.impl.XMLErrorReporter;
import org.xml.sax.ErrorHandler;

Validator validator = schema.newValidator();
ErrorHandler errorHandler = new YourErrorHandler();
validator.setErrorHandler(errorHandler);

XMLErrorReporter xmlErrorReporter = (XMLErrorReporter) validator
        .getProperty("http://apache.org/xml/properties/internal/error-reporter");
xmlErrorReporter.setLocale(new Locale("ru", "RU"));

Though with Java9+ you'd need to export the com.sun.org.apache.xerces.internal.impl package from the java.xml module via compiler option. See this answer for more details.

Shorthorn