public static FromJarEntryClassInformationProvider createFromCustomJar(
            File jarFile, @Nullable String jobClassName) {
        return new FromJarEntryClassInformationProvider(jarFile, jobClassName);
    }
@Test
    void testEitherJobClassNameOrJarHasToBeSet() {
        assertThatThrownBy(
                        () -> FromJarEntryClassInformationProvider.createFromCustomJar(null, null))
                .isInstanceOf(NullPointerException.class);
    }