var AmetysHomeHelper = Java.type('AmetysHomeHelper');    
var PatternLayout = Java.type('org.apache.log4j.PatternLayout');    
var FileAppender = Java.type('org.apache.log4j.FileAppender');    
var Level = Java.type('org.apache.log4j.Level');    
var LogManager = Java.type('org.apache.log4j.LogManager');    

function createNewLogFile(category, level)    
{       
    var logger = LogManager.getLogger(category);    
    logger.setAdditivity(false);    
    logger.setLevel(Level.toLevel(level));
    if (logger.getAppender(category) == null)  
    {    
        var filename = AmetysHomeHelper.getAmetysHome() + "/logs/" + category + ".log";    
        var layout = new PatternLayout("%d %-5p [%c] (%t;%X{requestURI}) %m%n");    
        var fileAppender = new FileAppender(layout, filename);    
        fileAppender.activateOptions(); 
        fileAppender.setName(category)    
        logger.addAppender(fileAppender);    
    }  
         
    return logger;    
}

var logger = createNewLogFile("script", "info");    
logger.info("Blablabla...");