checker.examples.GradleExamples.GradleJava7Example.src.main.java.org.checkerframework.example.GradleExample Maven / Gradle / Ivy

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The Checker Framework enhances Java’s type system to make it more powerful and useful. This lets software developers detect and prevent errors in their Java programs. The Checker Framework includes compiler plug-ins ("checkers") that find bugs or verify their absence. It also permits you to write your own compiler plug-ins.

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package org.checkerframework.example;
/*>>>
import org.checkerframework.checker.nullness.qual.NonNull;
import org.checkerframework.checker.nullness.qual.Nullable;
*/

import org.apache.commons.lang3.text.StrBuilder;

import java.util.List;
import java.util.ArrayList;

/**
 * If you run:
 * gradle build
 *
 * The build for this project should fail with a warning for the line:
 * @NonNull Object nn = nullable;
 *
 * And this line:
 * list.add(null);
 */
public class GradleExample {

    public static /*@Nullable*/ Object nullable = null;

    public static void main(final String[] args) {
        System.out.println("Hello World!");

        StrBuilder stb = new StrBuilder();

        /*@NonNull*/ Object nn = nullable;  // error on this line
        System.out.println(nn);
        List list = new ArrayList<>();
        list.add(null); // error on this line
    }
}