에러 java.lang.NoClassDefFoundError: org/apache/logging/log4j/util/ReflectionUtil

org/apache/logging/log4j/util/ReflectionUtil 클래스가 존재하지 않아 발생하는 에러입니다.

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:358)

at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:155)

at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:132)

at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:273)

at org.springframework.context.support.AbstractApplicationContext.<init>(AbstractApplicationContext.java:159)

at org.springframework.context.support.GenericApplicationContext.<init>(GenericApplicationContext.java:102)

at org.springframework.context.annotation.AnnotationConfigApplicationContext.<init>(AnnotationConfigApplicationContext.java:60)

at org.springframework.context.annotation.AnnotationConfigApplicationContext.<init>(AnnotationConfigApplicationContext.java:82)

at spring10.user.dao.DaoMain.main(DaoMain.java:14)

Caused by: java.lang.ClassNotFoundException: org.apache.logging.log4j.util.ReflectionUtil

at java.net.URLClassLoader.findClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

... 12 more

pom.xml에 log4j-core를 추가합니다.

       <dependency>

        <groupId>org.apache.logging.log4j</groupId>

        <artifactId>log4j-core</artifactId>

        <version>2.11.1</version>

       </dependency>

Maven Dependencies에 해당 jar가 추가되고 다시 컴파일하면 에러가 사라지게 됩니다.