Create new JAXB Marshaller instance in static method… is it ThreadSafe?

问题

I have implemented a util class with the following static method:

public static String objToXml(JAXBContext jaxbContext, ClassA obj) throws Exception{
    Marshaller jaxbMarshaller = jaxbContext.createMarshaller();
    jaxbMarshaller.setProperty( Marshaller.JAXB_FORMATTED_OUTPUT, true );
    StringWriter writer = new StringWriter();
    marshaller.marshal(obj, writer);
    return writer.toString();
}

My understanding is that JAXB Marshaller and StringWriter are both thread safe ... but I want to double confirm if I implement a static method like this.. and have multiple threads calling objToXml method concurrently, would there be any potential issue?

回答1:

Yes you must create a new Marshaller each time around if you are planning to use them multi-threaded.

See Unofficial JAXB Guide

The JAXBContext class is thread safe, but the Marshaller, Unmarshaller, and Validator classes are not thread safe.

来源：https://stackoverflow.com/questions/36062415/create-new-jaxb-marshaller-instance-in-static-method-is-it-threadsafe