springboot @ Slf4j configuration

@ Slf4j be omitted private static final org.slf4j.Logger log = org.slf4j.LoggerFactory.getLogger (LogExample.class);

Variables can be used directly to print more info log level of a log, debug default does not print;

log variables need to introduce packages lombok

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>    

sts, eclipse simply lombok jar package into the root directory on it, idea lombok need to install plug-ins

SpringToolSuite4.ini then add:

-Xbootclasspath/a:lombok1.18.4.jar
-javaagent:lombok1.18.4.jar

Can restart