"package com.sun.net does not exist" error after upgrading Designer to 7.0.1

I have a Java agent that I developed on a 6.5.4 Designer client. It has always compiled successfully. It has been running in a web application on a 6.5.4 Domino server for over a year.

After upgrading my Designer client from 6.5.5 to 7.0.1, I went into this agent to make a minor change, and found I can no longer compile the agent. I get the error message:

Java agent: package com.sun.net does not exist

This message occurs on the following line of code:

import com.sun.net.*;

The required jar files are in the project: jcert.jar, jnet.jar, and jsse.jar. Additionally, these jar files are in the c:\lotus\domino\jvm\lib\ext subdirectory.

Again… this is not new code… the only thing that’s changed is that I’ve upgraded my Designer client to 7.0.1. Do you have any ideas of what I can do to fix this problem? I need to make a design change to this agent, and it’s starting to look like I need to go back to 6.5.5. Thanks in advance for your help !