XML : Xtream com.thoughtworks.xstream.mapper.CannotResolveClassException

I am trying XStream. But when I try to parse my xml file i am getting this exception.

Xml Data is Below : Categories>Category>Children>Category

  <SuccessResponse>   <Head>        <RequestId></RequestId>        <RequestAction>GetCategoryTree</RequestAction>        <ResponseType>Categories</ResponseType>        <Timestamp>2015-11-25T15:28:09+0800</Timestamp>   </Head>   <Body>        <Categories>             <Category>              <Name>Chinese Books</Name>              <CategoryId>3460</CategoryId>              <GlobalIdentifier>chinese_books</GlobalIdentifier>              <Children>                <Category>                  <Name>Literature</Name>                  <CategoryId>3461</CategoryId>                  <GlobalIdentifier>literature2</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Lifestyle Books</Name>                  <CategoryId>3462</CategoryId>                  <GlobalIdentifier>lifestyle_books2</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Teens Books</Name>                  <CategoryId>3463</CategoryId>                  <GlobalIdentifier>teens_books2</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Biography Books</Name>                  <CategoryId>3464</CategoryId>                  <GlobalIdentifier>biography_books2</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Business Books</Name>                  <CategoryId>3465</CategoryId>                  <GlobalIdentifier>business_books2</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Calendars</Name>                  <CategoryId>3466</CategoryId>                  <GlobalIdentifier>calendars3</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Babies' Books</Name>                  <CategoryId>3467</CategoryId>                  <GlobalIdentifier>babies_books2</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Toddlers' Books</Name>                  <CategoryId>3468</CategoryId>                  <GlobalIdentifier>toddlers_books2</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Parent's Books</Name>                  <CategoryId>3469</CategoryId>                  <GlobalIdentifier>parents_books2</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Children's Books</Name>                  <CategoryId>3470</CategoryId>                  <GlobalIdentifier>childrens_books2</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Religion Books</Name>                  <CategoryId>3471</CategoryId>                  <GlobalIdentifier>religion_books2</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Comic Books</Name>                  <CategoryId>3472</CategoryId>                  <GlobalIdentifier>comic_books2</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Technology Books</Name>                  <CategoryId>3473</CategoryId>                  <GlobalIdentifier>technology_books2</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Cooking Books</Name>                  <CategoryId>3474</CategoryId>                  <GlobalIdentifier>cooking_books2</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Pre Sell Books</Name>                  <CategoryId>3476</CategoryId>                  <GlobalIdentifier>pre_sell_books2</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Education Books</Name>                  <CategoryId>3477</CategoryId>                  <GlobalIdentifier>education_books2</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Fitness Books</Name>                  <CategoryId>3478</CategoryId>                  <GlobalIdentifier>fitness_books2</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>History Books</Name>                  <CategoryId>3479</CategoryId>                  <GlobalIdentifier>history_books2</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Entertainment Books</Name>                  <CategoryId>3480</CategoryId>                  <GlobalIdentifier>entertainment_books2</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Law Books</Name>                  <CategoryId>3481</CategoryId>                  <GlobalIdentifier>law_books2</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Art Books</Name>                  <CategoryId>3482</CategoryId>                  <GlobalIdentifier>art_books2</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Medical Books</Name>                  <CategoryId>3483</CategoryId>                  <GlobalIdentifier>medical_books2</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Thrillers</Name>                  <CategoryId>3484</CategoryId>                  <GlobalIdentifier>thrillers2</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Relationship Books</Name>                  <CategoryId>3485</CategoryId>                  <GlobalIdentifier>relationship_books2</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Social Books</Name>                  <CategoryId>3486</CategoryId>                  <GlobalIdentifier>social_books2</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Professional Books</Name>                  <CategoryId>3487</CategoryId>                  <GlobalIdentifier>professional_books2</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Romance</Name>                  <CategoryId>3488</CategoryId>                  <GlobalIdentifier>romance3</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Science Books</Name>                  <CategoryId>3489</CategoryId>                  <GlobalIdentifier>science_books2</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Science Fiction Books</Name>                  <CategoryId>3490</CategoryId>                  <GlobalIdentifier>science_fiction_books2</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Self Help</Name>                  <CategoryId>3491</CategoryId>                  <GlobalIdentifier>self_help2</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Sport Books</Name>                  <CategoryId>3492</CategoryId>                  <GlobalIdentifier>sport_books2</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Travel Books</Name>                  <CategoryId>3493</CategoryId>                  <GlobalIdentifier>travel_books2</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Study Aids &amp; Exam Preparations</Name>                  <CategoryId>8453</CategoryId>                  <GlobalIdentifier>study_aids_exam_preparations</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Language, Linguistics &amp; Writing</Name>                  <CategoryId>8455</CategoryId>                  <GlobalIdentifier>language_linguistics_writing</GlobalIdentifier>                  <Children>                    <Category>                      <Name>Language Learning &amp; Teaching</Name>                      <CategoryId>8458</CategoryId>                      <GlobalIdentifier>language_learning_teaching</GlobalIdentifier>                      <Children/>                    </Category>                    <Category>                      <Name>Linguistics</Name>                      <CategoryId>8459</CategoryId>                      <GlobalIdentifier>linguistics</GlobalIdentifier>                      <Children/>                    </Category>                    <Category>                      <Name>Grammar</Name>                      <CategoryId>8460</CategoryId>                      <GlobalIdentifier>grammar</GlobalIdentifier>                      <Children/>                    </Category>                    <Category>                      <Name>Dictionaries</Name>                      <CategoryId>8461</CategoryId>                      <GlobalIdentifier>dictionaries</GlobalIdentifier>                      <Children/>                    </Category>                  </Children>                </Category>                <Category>                  <Name>Text books</Name>                  <CategoryId>8462</CategoryId>                  <GlobalIdentifier>text_books</GlobalIdentifier>                  <Children>                    <Category>                      <Name>High School</Name>                      <CategoryId>8463</CategoryId>                      <GlobalIdentifier>high_school1</GlobalIdentifier>                      <Children/>                    </Category>                    <Category>                      <Name>University</Name>                      <CategoryId>8464</CategoryId>                      <GlobalIdentifier>university1</GlobalIdentifier>                      <Children/>                    </Category>                  </Children>                </Category>              </Children>            </Category>            <Category>              <Name>Calendars</Name>              <CategoryId>8465</CategoryId>              <GlobalIdentifier>calendars</GlobalIdentifier>              <Children>                <Category>                  <Name>Wall calendars</Name>                  <CategoryId>8466</CategoryId>                  <GlobalIdentifier>wall_calendars</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Mini wall calendars</Name>                  <CategoryId>8467</CategoryId>                  <GlobalIdentifier>mini_wall_calendars</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Box calendars</Name>                  <CategoryId>8468</CategoryId>                  <GlobalIdentifier>box_calendars</GlobalIdentifier>                  <Children/>                </Category>                <Category>                  <Name>Planners</Name>                  <CategoryId>8469</CategoryId>                  <GlobalIdentifier>planners</GlobalIdentifier>                  <Children/>                </Category>              </Children>            </Category>        </Categories>   </Body>    

Categories Object

  @XStreamAlias("Categories")  public class Categories {      private List<Category> Category;   }    

Category Object

  @XStreamAlias("Category")  public class Category {    private String Name;  private String CategoryId;  private String GlobalIdentifier;  private Children Children;  }    

Children Object

  @XStreamAlias("Children")  public class Children {      private List<Category> Category;  }    

Parsing :

  XStream xs = new XStream();  xs.autodetectAnnotations(true);    xs.alias("Categories", Categories.class);  xs.alias("SuccessResponse", CategorySuccessResponse.class);    CategorySuccessResponse successResponse = (CategorySuccessResponse) xs              .fromXML(response);    

Error:

  ---- Debugging information ----  message             : Name  cause-exception     :                com.thoughtworks.xstream.mapper.CannotResolveClassException  cause-message       : Name  class               : java.util.ArrayList  required-type       : java.util.ArrayList  converter-type      :       com.thoughtworks.xstream.converters.collections.CollectionConverter  path                : /SuccessResponse/Body/Categories/Category/Name  line number         : 12  version             : 1.4.8    

Whats the cause of this error?

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