Vlad Mihalcea, take a look at https://github.com/apache/logging-log4j2/blob/master/log4j-jpa/src/main/java/org/apache/logging/log4j/jpa/appender/AbstractLogEventWrapperEntity.java .

You'll see that the class is annotated with:

@MappedSuperclass
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)