<profile>
  <id>yourjdk</id>
  <activation>
    <activeByDefault>true</activeByDefault>
    <jdk>1.8</jdk>
  </activation>
  <properties>
      <maven.compiler.source>1.8</maven.compiler.source>
      <maven.compiler.target>1.8</maven.compiler.target>
      <maven.compiler.compilerVersion>1.8</maven.compiler.compilerVersion>
  </properties>
</profile>