assertFalse(options.isUse());
        assertFalse(options.isVersion());
        assertFalse(options.isAuthor());
        assertFalse(options.isSplitIndex());
        assertNull(options.getWindowTitle());
        assertNull(options.getDocTitle());
        assertNull(options.getFooter());
        assertNull(options.getBottom());
        assertEmpty(options.getLinks());
        assertEmpty(options.getLinksOffline());

            throw new UncheckedIOException(ex);
        }
        getAntGroovydoc().execute(
            getSource(), destinationDir, isUse(), isNoTimestamp(), isNoVersionStamp(),
            getWindowTitle(), getDocTitle(), getHeader(), getFooter(), getPathToOverview(),
            getAccess().get(), getLinks(), getGroovyClasspath(), getClasspath(),
            getTemporaryDir(), getServices().get(FileSystemOperations.class),

            // Added so JavaDoc has the same behavior as JavaCompile regarding the bootClasspath
            getProjectLayout().files(options.getBootClasspath()).getAsPath();
        }

        if (!isTrue(options.getWindowTitle()) && isTrue(getTitle())) {
            options.windowTitle(getTitle());
        }
        if (!isTrue(options.getDocTitle()) && isTrue(getTitle())) {
            options.setDocTitle(getTitle());
        }

        setJFlags(copyOrNull(original.getJFlags()));
        setOptionFiles(copyOrNull(original.getOptionFiles()));
        setDestinationDirectory(original.getDestinationDirectory());
        setWindowTitle(original.getWindowTitle());
        setHeader(original.getHeader());
        setSourceNames(copyOrNull(original.getSourceNames()));
    }

    private static <T> List<T> copyOrNull(List<T> items) {
        if (items == null) {