title: release version 1.8 not supported
body: <p>I have a project that is using Java 8.</p>
  
  <p>Up to now in the pom we specified the source and target version as 1.8:</p>
  
  <pre><code>&lt;maven.compiler.source&gt;1.8&lt;/maven.compiler.source&gt;
  &lt;maven.compiler.target&gt;1.8&lt;/maven.compiler.target&gt;
  </code></pre>
  
  <p>We want to utilize the "-release" Option of Java 9+ and added the following:</p>
  
  <pre><code>&lt;maven.compiler.release&gt;1.8&lt;/maven.compiler.release&gt;
  </code></pre>
  
  <p>But now we get the following error:</p>
  
  <pre><code>Fatal error compiling: release version 1.8 not supported
  </code></pre>
  
  <p>We are using maven 3.5.3, the maven-compiler-plugin in version 3.8.0 and Java 10 to compile the project.</p>
  
  <p>What is wrong here?</p>