Flink No appenders could be found for logger
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1. 现象
在本地 idea 上运行 Flink 程序时，提示如下告警，同时也不会输出日志：
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/Users/wy/.m2/repository/org/slf4j/slf4j-log4j12/1.7.10/slf4j-log4j12-1.7.10.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/Users/wy/.m2/repository/org/apache/logging/log4j/log4j-slf4j-impl/2.17.1/log4j-slf4j-impl-2.17.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
log4j:WARN No appenders could be found for logger (com.flink.example.table.function.windows.GroupWindowSQLExample).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
2. 解决方案
如报警提示，slf4j 发现了两个桥接器：
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