NullPointerException with DoubleLiteral

[msteinbeck]

Hi,

I get a NullPointerException when creating a spoon model for the following code:

import java.util.HashMap;
import java.util.Map;

public class DoubleLiteralBug {

    public static void main(final String[] args) {
        Map<String, UknownClass> map = new HashMap<>();

        map.forEach((key, value) -> {
            double d = 1d;
        });
    }
}

The model is created as follows:
(with projectPath being the path to the DoubleLiteralBug.java file)

Launcher runLaunch = new Launcher();
runLaunch.getEnvironment().setNoClasspath(true);
runLaunch.addInputResource(projectPath);
runLaunch.buildModel();

I noticed that the error can be removed by either replacing UknownClass with a class available in classpath, or by moving double d = 1d; out of the forEach lambda.

[msteinbeck]

A potential fix is given in #758.