用log4j记录jsf异常

Question

我正在尝试使用log4j my log4j记录非maven项目中的异常。属性

log4j.rootLogger = debug, stdout, FILE

log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target = System.out
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern = %d{ABSOLUTE} %5p %c{1}:%L - %m%n

log4j.appender.FILE = org.apache.log4j.RollingFileAppender
log4j.appender.FILE.maxFileSize = 100kb
log4j.appender.FILE.maxBackupIndex = 2
log4j.appender.file.File=C:/Users/dev/Desktop/log.txt
log4j.appender.FILE.Threshold = debug
log4j.appender.FILE.layout = org.apache.log4j.PatternLayout
log4j.appender.FILE.layout.ConversionPattern = %d{ABSOLUTE} %5p %c{1}:%L - %m%n

并使用了balusC answer中提到的异常处理程序和工厂

public class ErpExceptionHandler extends ExceptionHandlerWrapper {

    private ExceptionHandler wrapped;
private static final long serialVersionUID = 1L;    

    private static Logger logger = Logger.getLogger(ErpExceptionHandler.class);
    public ErpExceptionHandler(ExceptionHandler wrapped) {
        this.wrapped = wrapped;
    }

    @Override
    public void handle() throws FacesException {
        FacesContext facesContext = FacesContext.getCurrentInstance();

        for (Iterator<ExceptionQueuedEvent> iter = getUnhandledExceptionQueuedEvents().iterator(); iter.hasNext();) {
            Throwable exception = iter.next().getContext().getException(); 

       logger.error("An exception occurred!", exception);
        }

        getWrapped().handle();
    }

    @Override
    public ExceptionHandler getWrapped() {
        return wrapped;
    }

}

我的日志文件还是空的，我在搞什么