title: Passing --add-opens argument to Java webstart
body: <p>I'm running an application using Java Webstart but it requires opening a module when run with Java 9+:</p>
  
  <blockquote>
    <p>java.lang.reflect.InaccessibleObjectException: Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int,java.security.ProtectionDomain) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to unnamed module @207bb528</p>
  </blockquote>
  
  <p>How do I need to modify my jnlp to make it work?</p>