Report exceptions with Groovy Markup Builders

Spider.groovy

def reportError = { msg, e ->
        new StreamingMarkupBuilder( ).bindNode {
            exception( message: e.message, detail: msg ) {
                stackTrace {
                    e?.stackTrace?.each {
                        at( file: it?.fileName, className: it?.className, method: it?.methodName,
                            line: it?.lineNumber ) {
                        }
                    }
                }
            }
        }
    }