test/langtools/tools/javac/lambda/methodReference/MethodReferenceComplexNullCheckTest.java

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/**
 * @test
 * @bug 8048121
 * @summary javac complex method references: revamp and simplify
 *
 * Make sure NPE check is done even in the convert to Lambda case
 */

public class MethodReferenceComplexNullCheckTest {
    public static void main(String[] args) {
        F fr = null;
        boolean npeFired = false;
        try {
            IForm frf = fr::doit;
        } catch (NullPointerException npe) {
            npeFired = true;
        } finally {
            if (!npeFired) throw new AssertionError( "NPE should have been thrown");
        }
    }

    interface IForm {
       void xyz(Object... args);
    }

    class F {
       private void doit(Object... args) { }
    }
}