NullPointerTester tester = new NullPointerTester();
    // Necessary until JDK15:
    // https://bugs.openjdk.org/browse/JDK-8202469
    tester.ignore(Equivalence.class.getMethod("wrap", Object.class));

    tester.testAllPublicStaticMethods(Equivalence.class);
    tester.testAllPublicInstanceMethods(Equivalence.equals());
    tester.testAllPublicInstanceMethods(Equivalence.identity());
  }

  public void testNullPointerExceptions() {
    NullPointerTester tester = new NullPointerTester();
    tester.testAllPublicStaticMethods(EvictingQueue.class);
    tester.testAllPublicConstructors(EvictingQueue.class);
    EvictingQueue<String> queue = EvictingQueue.create(5);
    // The queue must be non-empty so it throws a NPE correctly
    queue.add("one");
    tester.testAllPublicInstanceMethods(queue);
  }

Auf die gleiche Weise könnten Sie im Exit-Code nach dem `yield` eine `HTTPException` oder ähnliches auslösen.

!!! tip "Tipp"

    Dies ist eine etwas fortgeschrittene Technik, die Sie in den meisten Fällen nicht wirklich benötigen, da Sie Exceptions (einschließlich `HTTPException`) innerhalb des restlichen Anwendungscodes auslösen können, beispielsweise in der *Pfadoperation-Funktion*.

            searchPaging(data, form);
        });
    }

    protected void searchPaging(final RenderData data, final SearchForm form) {
        // page navi
        RenderDataUtil.register(data, "stemmerOverrideItemItems",
                stemmerOverrideService.getStemmerOverrideList(form.dictId, stemmerOverridePager));

        // restore from pager

            searchPaging(data, form);
        });
    }

    protected void searchPaging(final RenderData data, final SearchForm form) {
        // page navi
        RenderDataUtil.register(data, "kuromojiItemItems", kuromojiService.getKuromojiList(form.dictId, kuromojiPager));

        // restore from pager
        BeanUtil.copyBeanToBean(kuromojiPager, form, op -> {

public class RenderDataUtilTest extends UnitFessTestCase {

    public void test_register() {
        RenderData data = new RenderData();

        RenderDataUtil.register(data, "key1", null);
        assertNull(data.getDataMap().get("key1"));

        RenderDataUtil.register(data, "key5", "");
        assertEquals(data.getDataMap().get("key5"), "");

    }

        RenderDataUtil.register(data, "userItems", userService.getUserList(userPager)); // page navi
        // restore from pager
        copyBeanToBean(userPager, form, op -> op.include("id"));
    }

    private void registerForms(final RenderData data) {
        RenderDataUtil.register(data, "roleItems", roleService.getAvailableRoleList());

@J2ktIncompatible // MapMaker
public class MapMakerTest extends TestCase {
  @GwtIncompatible // NullPointerTester
  public void testNullParameters() throws Exception {
    NullPointerTester tester = new NullPointerTester();
    tester.testAllPublicInstanceMethods(new MapMaker());
  }

  @GwtIncompatible // threads
  static final class DelayingIdentityLoader<T> implements Function<T, T> {
    private final CountDownLatch delayLatch;

  public void testNullPointerExceptions() {
    NullPointerTester tester = new NullPointerTester();
    tester.testAllPublicStaticMethods(EvictingQueue.class);
    tester.testAllPublicConstructors(EvictingQueue.class);
    EvictingQueue<String> queue = EvictingQueue.create(5);
    // The queue must be non-empty so it throws a NPE correctly
    queue.add("one");
    tester.testAllPublicInstanceMethods(queue);
  }

            searchPaging(data, form);
        });
    }

    protected void searchPaging(final RenderData data, final SearchForm form) {
        RenderDataUtil.register(data, "jobLogItems", jobLogService.getJobLogList(jobLogPager)); // page navi

        // restore from pager
        copyBeanToBean(jobLogPager, form, op -> op.include("id"));
    }