And start using --release. As of JEP-247 released in java 9, the flag will allow you to compile for older releases of java without worrying about the dreaded NoSuchMethodError.

Stop talking and show me the code!

Gradle

tasks.withType(JavaCompile) {
    options.release = 8
}

Gradle (kts)

tasks.withType<JavaCompile> {
    options.release.set(8)
}

Maven (xml)

<configuration>
    <release>8</release>
</configuration>