Can I safely set SAAJ API system properties in EAP 5?

Issue

I'm trying to use Apache Axis, but it's failing with this error:

javax.xml.soap.SOAPException: Unable to create SOAP connection factory: 
  org.jboss.ws.core.soap.SOAPConnectionFactoryImpl cannot be cast to javax.xml.soap.SOAPConnectionFactory

I can resolve this error by setting these system properties:

System.setProperty("javax.xml.soap.SOAPFactory", "org.apache.axis.soap.SOAPFactoryImpl");
System.setProperty("javax.xml.soap.MessageFactory","org.apache.axis.soap.MessageFactoryImpl");
System.setProperty("javax.xml.soap.SOAPConnectionFactory","org.apache.axis.soap.SOAPConnectionFactoryImpl");

Is this safe to do?