slf4j with Java11 example

[rolfschumacher]

Thank you for the Java11 example. If you would add

        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.8.0-beta2</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <scope>runtime</scope>
            <version>1.3.0-alpha4</version>
        </dependency>

it would run free of failure messages out of the box.