Q:

[ERROR]: cannot find symbol variable log when building with maven and lombok

I am trying to build a Java 11 project with maven and lombok's @Slf4j Logger, but maven does not recognize the log variables.  IntelliJ does though and is able to build the project. 
The error is
[ERROR]: cannot find symbol variable log 

Project and Module SDK is both Java 11.  Lombok Version is 1.18.2:
<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>1.18.12</version>
    <scope>provided</scope>
</dependency>

My maven compiler setup:
<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.8.1</version>
            <configuration>
                <source>11</source>
                <target>11</target>
                <forceJavacCompilerUse>true</forceJavacCompilerUse>
                <annotationProcessorPaths>
                    <path>
                        <groupId>org.projectlombok</groupId>
                        <artifactId>lombok</artifactId>
                        <version>1.18.12</version>
                    </path>
                </annotationProcessorPaths>
            </configuration>
        </plugin>
    </plugins>
</build>

I already tried:

turning Annotaion Processing off and on again
reinstalling Lombok plugin
clearing .m2/repository folder
manually adding lombok.jar as Annotation Processor
adding Lombok path to maven-compiler-plugin list of Annotation Processor

A:

This is a really minimal example configuration for using the @Slf4j lombok logging annotation.   
You need a logging facade and an implementation, in this case I'm going to use slf4j (as facade) and logback (as implementation).   

pom.xml 
<? xml version="1.0" encoding="UTF-8"? >
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>org.example</groupId>
    <artifactId>untitled</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>11</maven.compiler.source>
        <maven.compiler.target>11</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.12</version>
            <scope>provided</scope>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.30</version>
        </dependency>

        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>1.2.3</version>
        </dependency>
    </dependencies>
</project>   

main.java 
import lombok.extern.slf4j. Slf4j;

@Slf4j
public class Main {

    public static void main(String[] args) {
        log.debug("Hello");
    }
}

If you get some trouble try always to force the maven dependencies updates running in your project folder mvn -U clean package and reimporting maven project in your IDE     
 

