NoClassDefFoundError: org/apache/logging/log4j/LogManager

Error

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/logging/log4j/LogManager
	at org.apache.poi.ooxml.POIXMLDocumentPart.<clinit>(POIXMLDocumentPart.java:56)
	
Caused by: java.lang.ClassNotFoundException: org.apache.logging.log4j.LogManager
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)

Solution

download the log4j2 jar from
https://logging.apache.org/log4j/2.x/download.html

add log4j-core and log4j-api to the classpath of your project.