title: How to avoid "Sharing is only supported for boot loader classes because bootstrap classpath has been appended" warning during debug with Java 11?
body: <p>Recently I switched to the Java 11 and start to debug my app and saw this message:</p>
  
  <blockquote>
    <p>OpenJDK 64-Bit Server VM warning: Sharing is only supported for boot
    loader classes because bootstrap classpath has been appended</p>
  </blockquote>
  
  <p>Found only <a href="http://hg.openjdk.java.net/jdk/jdk/rev/18fba780c1d1" rel="noreferrer">this commit</a> and <a href="https://bugs.openjdk.java.net/browse/JDK-8203031" rel="noreferrer">ticket</a>, but it doesn't tell me much. </p>
  
  <p>Do I need to worry about it?</p>