generics.java

public class テスト {

    @Data
    static class Name {
        String name;
    }

    private static <T> List<T> test1(Class<T> clazz) throws IOException {
        val mapper = new ObjectMapper();
        return mapper.readValue("[{\"name\": \"hokuto\"}]", new TypeReference<List<T>>() {});
    }

    @Test
    public void test() throws IOException {
        List<Name> t = test1(Name.class);
        System.out.println(t); // OK!
        t.forEach(System.out::println)); // java.lang.ClassCastException!!!
    }

}