The following code takes a long time (several minutes) to compile:

class Point<T extends Comparable<T>> {
   Point(T label) { }
}

class Graph<T extends Comparable<T>> {
    @SafeVarargs
    public Graph(Point<T>... vertices) { }
}

class Test {

    //100 points
    Graph<Integer> GEO = new Graph<>(
            new Point<>(1),
            new Point<>(2),
            new Point<>(3),
            new Point<>(4),
            new Point<>(5),
            new Point<>(6),
            new Point<>(7),
            new Point<>(8),
            new Point<>(9),
            new Point<>(10),
            new Point<>(11),
            new Point<>(12),
            new Point<>(13),
            new Point<>(14),
            new Point<>(15),
            new Point<>(16),
            new Point<>(17),
            new Point<>(18),
            new Point<>(19),
            new Point<>(20),
            new Point<>(21),
            new Point<>(22),
            new Point<>(23),
            new Point<>(24),
            new Point<>(25),
            new Point<>(26),
            new Point<>(27),
            new Point<>(28),
            new Point<>(29),
            new Point<>(30),
            new Point<>(31),
            new Point<>(32),
            new Point<>(33),
            new Point<>(34),
            new Point<>(35),
            new Point<>(36),
            new Point<>(37),
            new Point<>(38),
            new Point<>(39),
            new Point<>(40),
            new Point<>(41),
            new Point<>(42),
            new Point<>(43),
            new Point<>(44),
            new Point<>(45),
            new Point<>(46),
            new Point<>(47),
            new Point<>(48),
            new Point<>(49),
            new Point<>(50),
            new Point<>(51),
            new Point<>(52),
            new Point<>(53),
            new Point<>(54),
            new Point<>(55),
            new Point<>(56),
            new Point<>(57),
            new Point<>(58),
            new Point<>(59),
            new Point<>(60),
            new Point<>(61),
            new Point<>(62),
            new Point<>(63),
            new Point<>(64),
            new Point<>(65),
            new Point<>(66),
            new Point<>(67),
            new Point<>(68),
            new Point<>(69),
            new Point<>(70),
            new Point<>(71),
            new Point<>(72),
            new Point<>(73),
            new Point<>(74),
            new Point<>(75),
            new Point<>(76),
            new Point<>(77),
            new Point<>(78),
            new Point<>(79),
            new Point<>(80),
            new Point<>(81),
            new Point<>(82),
            new Point<>(83),
            new Point<>(84),
            new Point<>(85),
            new Point<>(86),
            new Point<>(87),
            new Point<>(88),
            new Point<>(89),
            new Point<>(90),
            new Point<>(91),
            new Point<>(92),
            new Point<>(93),
            new Point<>(94),
            new Point<>(95),
            new Point<>(96),
            new Point<>(97),
            new Point<>(98),
            new Point<>(99),
            new Point<>(100)
    );
}

[source adapted from: https://youtrack.jetbrains.com/issue/IDEA-149952]

In JDK 7, compilation takes less than a second.