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Once you have the SubjectFactory installed and you know what the username/cred combo, is,  what needs to be done before you do getSubject() is the following:

AccessController.doPrivileged( new PrivilegedAction()
{
  public Object run()
  {
     //Create a security context on the association
     SecurityContext securityContext = SecurityContextFactory.createSecurityContext(securityDomainName);
     SecurityContextAssociation.setSecurityContext(securityContext);
 
     //Now let us add the user name and cred
     securityContext.getSubjectInfo().setPrincipal( principal );
     securityContext.getSubjectInfo().setCredential( credential );
 
};

The implementation of SubjectFactory basically looks for the username/cred in the current security context on the SecurityContextAssociation.