Unable to add Java imports in KIE workbench (jBPM)

I am brand new to jBPM. I am using the jBPM KIE workbench. As you can see in the 2nd picture, I added in the necessary imports in the KIE external data objects section. Why am I getting the errors? Do I need to do something else with the imports?

I am getting a thrown error of:

[KBase: defaultKieBase]: Process Compilation error URL cannot be resolved to a type
URL cannot be resolved to a type
HttpURLConnection cannot be resolved to a type
HttpURLConnection cannot be resolved to a type
BufferedReader cannot be resolved to a type
BufferedReader cannot be resolved to a type
InputStreamReader cannot be resolved to a type

Java Code:

    try {
        URL url = new URL("http://localhost:8080/users");
        HttpURLConnection con = (HttpURLConnection) url.openConnection();
        con.setRequestMethod("GET");
        con.setRequestProperty("Content-Type", "application/json");

        BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
        String inputLine;
        StringBuffer content = new StringBuffer();

        while ((inputLine = in.readLine()) != null) {
            content.append(inputLine);
        }

        in.close();

        System.out.println(content);
    }

    catch(Exception e){
        throw new RuntimeException(e);
    }

The built in REST workitem should be a good starting point.

Create a project and add a BusinessProcess:

Then Add the built in Rest Workitem

Then Open the Rest Workitem Properties and select the data assignments

And enter values for the Rest Call