java - 错误找不到键 log4j.appender.error 的值

Question

我的 log4j.properties:

log4j.logger.Controller = INFO,stdout
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{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

错误跟踪:

log4j:ERROR Could not find value for key log4j.appender.error log4j:ERROR Could not instantiate appender named "error". Oct 13, 2015 1:32:50 PM org.apache.catalina.core.ApplicationContext log INFO: Initializing Spring root WebApplicationContext log4j:WARN No appenders could be found for logger (org.springframework.web.context.ContextLoader). log4j:WARN Please initialize the log4j system properly. log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

代码中的错误附加程序在哪里，我不明白

更新:

编写我如何使用日志的代码

final static Logger logger = Logger.getLogger(Controller.class);
logger.info("200 OK");
logger.error("Incorrect json format");

Answer 1

在 log4j.properties 文件中尝试一下，

# Set root logger level to INFO and its only appender to stdout
log4j.rootLogger=INFO, stdout

# stdout is set to be a ConsoleAppender.
log4j.appender.stdout=org.apache.log4j.ConsoleAppender

# stdout uses PatternLayout.
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c:%L - %m%n

查看更多Apache log4j 2.x documentation guide .