log4j:WARN No appenders could be found for logger (org.apache.flink.table.module.ModuleManager)

一、描述

  log4j:WARN No appenders could be found for logger (org.apache.flink.table.module.ModuleManager)

二、分析

  1、添加-Dlog4j.debug参数，打印如下信息

log4j: Trying to find [log4j.xml] using context classloader sun.misc.Launcher$AppClassLoader@18b4aac2.
log4j: Trying to find [log4j.xml] using sun.misc.Launcher$AppClassLoader@18b4aac2 class loader.
log4j: Trying to find [log4j.xml] using ClassLoader.getSystemResource().
log4j: Trying to find [log4j.properties] using context classloader sun.misc.Launcher$AppClassLoader@18b4aac2.
log4j: Trying to find [log4j.properties] using sun.misc.Launcher$AppClassLoader@18b4aac2 class loader.
log4j: Trying to find [log4j.properties] using ClassLoader.getSystemResource().
log4j: Could not find resource: [null].
log4j:WARN No appenders could be found for logger (org.apache.flink.api.java.ClosureCleaner).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

三、解决方法

  先配置log4j.properties，如果还不行，那在main方法中添加BasicConfigurator.configure();，如果还不行，通过代码设置org.apache.log4j.Logger.getRootLogger().setLevel(org.apache.log4j.Level.ERROR);

四、参考文章
  1、https://stackoverflow.com/questions/1509324/log4j-basic-configuration