code: public void setJdkLevel(String jdkLevel) {
  		GenJDKLevel l = GenJDKLevel.getByName(jdkLevel);
  		Assert.isNotNull(l, "Invalid JDK level");
  		this.jdkLevel = l;
  	}
docs: Set the JDK compatibility level. The following values are valid:
  <ul>
  <li>"JDK14"</li>
  <li>"JDK50"</li>
  <li>"JDK60"</li>
  <li>"JDK70"</li>
  <li>"JDK80"</li>
  </ul>
  The default level is "JDK60".
  
  @since 2.8