final PDFTextStripper stripper = new PDFTextStripper();
            final AtomicBoolean done = new AtomicBoolean(false);
            final PDDocument doc = document;
            final Set<Exception> exceptionSet = new HashSet<>();
            final Thread task = new Thread(() -> {
                try {
                    stripper.writeText(doc, writer);

  public void testIsEqualToNull_serialization() {
    checkSerialization(Predicates.equalTo(null));
  }

  /**
   * Tests for Predicates.instanceOf(x). TODO: Fix the comment style after fixing annotation
   * stripper to remove comments properly. Currently, all tests before the comments are removed as
   * well.
   */
  @GwtIncompatible // Predicates.instanceOf
  public void testIsInstanceOf_apply() {

  public void testIsEqualToNull_serialization() {
    checkSerialization(Predicates.equalTo(null));
  }

  /**
   * Tests for Predicates.instanceOf(x). TODO: Fix the comment style after fixing annotation
   * stripper to remove comments properly. Currently, all tests before the comments are removed as
   * well.
   */
  @GwtIncompatible // Predicates.instanceOf
  public void testIsInstanceOf_apply() {

Class <org.gradle.nativeplatform.toolchain.internal.Stripper$1> is not annotated (directly or via its package) with @org.gradle.api.NonNullApi in (Stripper.java:0)
Class <org.gradle.nativeplatform.toolchain.internal.Stripper$StripperArgsTransformer> is not annotated (directly or via its package) with @org.gradle.api.NonNullApi in (Stripper.java:0)