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　　java.lang.AbstractMethodError:

　　org.slf4j.impl.JDK14LoggerAdapter.log(Lorg/slf4j/Marker; Ljava/lang/String;

　　[Ljava/lang/Object; Ljava/lang/Throwable;)

a new jar package has been added to the project, including the jar package of slf4j. When you start Tomcat and run JUnit unit test, an error will be reported

Solution:

Check whether the jar package is in conflict or the jar version is incompatible (headache conflict)

Because of the incompatibility between “slf4j-api-1.6.2. Jar ” and “slf4j-jdk14-1.5.6. Jar” in my project, delete “slf4j-jdk14-1.5.6. Jar” and download a “slf4j-jdk14-1.6.2. Jar” in the Lib directory, the problem is solved

Provide a download address:

　　　　 http://mvnrepository.com/artifact/org.slf4j/slf4j-jdk14