报错信息 ：org.apache.logging.log4j.util.ReflectionUtil

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/logging/log4j/util/ReflectionUtil
    at org.apache.logging.slf4j.Log4jLoggerFactory.getContext(Log4jLoggerFactory.java:42)
    at org.apache.logging.log4j.spi.AbstractLoggerAdapter.getLogger(AbstractLoggerAdapter.java:46)
    at org.apache.logging.slf4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:29)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:363)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:388)
    at org.apache.flink.configuration.Configuration.<clinit>(Configuration.java:63)
    at org.apache.flink.streaming.api.environment.StreamExecutionEnvironment.getExecutionEnvironment(StreamExecutionEnvironment.java:2087)
    at com.jn.Flink.main(Flink.java:19)
Caused by: java.lang.ClassNotFoundException: org.apache.logging.log4j.util.ReflectionUtil
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 8 more
 

只写了Flink执行环境就报错Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/logging/log4j/util/ReflectionUtil

检查自己的maven依赖，进入pom文件查找log4j,具体如下图

log4j-core与log4j是我原有pom内就存在的

加上蓝框里的log4j-api依赖问题解决

<dependency>
    <groupId>org.apache.logging.log4j</groupId>
    <artifactId>log4j-api</artifactId>
    <version>2.8.2</version>
</dependency>