The ASN.1 NULL type is converted into to a Java class that extends the Asn1Null run-time class. This base class does not contain a public member variable for a value because the NULL type has no associated value.

The following shows the basic mapping from ASN.1 type to Java class definition:

ASN.1 Production

   <name> ::= NULL

Generated Java class

   public class <name> extends Asn1Null {
      public <name> () {
         super();
      }
   }

This shows the class generated for a simple NULL assignment. If a tagged type is specified, specific encode and decode methods will be generated as well.