public void someMethod() {
    RBLChecker rblChecker = RBLChecker.newInstance()
                                      .withSource(new ZENSpamhaus())
                                      .withSource(new Spamcop())
                                      ;
    List<RBLError> errors = rblChecker.check("8.8.8.8");
    
    /*
        Do some stuff with the errors
    */
}