2017-02-23 51 views
0

Итак, ища решение here, here и here, я все еще не могу разобрать объект Java из XML. XML имеет вложенные теги, и я разработал свои классы соответственно, но я не могу узнать, где я ошибаюсь.CannotResolveClassException при использовании XStream на вложенных XML

Ниже мой XML

private static final String XML = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" + 
      "<author>\n" + 
      "<name>Auro</name>\n" + 
      "<id>123</id>\n" + 
      "<books>\n" + 
      "<name>C++</name>\n" + 
      "<status>published</status>\n" + 
      "</books>\n" + 
      "<books>\n" + 
      "<name>Java</name>\n" + 
      "<status>unpublished</status>\n" + 
      "</books>\n" + 
      "</author>"; 

Автор класс

public class Author { 

    private String name; 
    private String id; 
    private List<Books> books; 

    public Author() {} 

    public Author(String name, String id, List<Books> books) { 
     this.name = name; 
     this.id = id; 
     this.books = books; 
    } 

    // Getters 
    public String getName() { 
     return name; 
    } 

    public String getId() { 
     return id; 
    } 

    public List<Books> getBooks() { 
     return books; 
    } 


    // Setters 
    public void setName(String name) { 
     this.name = name; 
    } 

    public void setId(String id) { 
     this.id = id; 
    } 

    public void setBooks(List<Books> books) { 
     this.books = books; 
    } 

    public String toString() { 

     String res = "Author_Name: " + name + " -- " + "Author_ID: " + id + " "; 
     for (Books book : books) { 
      res = res + book.toString(); 
     } 
     return res; 
    } 
} 

Books.java класс

public class Books { 

    private String name; 
    private String status; 

    public Books() {} 

    public Books(String name, String status) { 
     this.name = name; 
     this.status = status; 
    } 

    // Getters 
    public String getName() { 
     return name; 
    } 

    public String getStatus() { 
     return status; 
    } 

    // Setters 
    public void setName(String name) { 
     this.name = name; 
    } 

    public void setStatus(String status) { 
     this.status = status; 
    } 


    public String toString() { 
     return "Book_Name: " + name + " -- " + "Book_Status: " + status + "\n"; 
    } 
} 

И следующее, как я называю метод

@RequestMapping(value = "/parse", method = RequestMethod.GET) 
    public String parse() { 

     System.out.print("THIS GOT TRIGGERED!!"); 
     XStream xStream = new XStream(); 
     xStream.alias("author",Author.class); 
     xStream.alias("books",Books.class); 

     Author author = (Author) xStream.fromXML(XML); 

     System.out.print(author.toString()); 

     return author.toString(); 

    } 

Но мое приложение врезаться со следующими ошибками:

-- Debugging information ---- 
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    : /author/books/name 
line number   : 6 
class[1]   : blahblah.testSpringboot.models.Author 
converter-type[1] : com.thoughtworks.xstream.converters.reflection.ReflectionConverter 
version    : 1.4.9 
-------------------------------] with root cause 

com.thoughtworks.xstream.mapper.CannotResolveClassException: name 
    at com.thoughtworks.xstream.mapper.DefaultMapper.realClass(DefaultMapper.java:81) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.mapper.DynamicProxyMapper.realClass(DynamicProxyMapper.java:55) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.mapper.PackageAliasingMapper.realClass(PackageAliasingMapper.java:88) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.mapper.ClassAliasingMapper.realClass(ClassAliasingMapper.java:79) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.mapper.ArrayMapper.realClass(ArrayMapper.java:74) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.mapper.SecurityMapper.realClass(SecurityMapper.java:71) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.mapper.CachingMapper.realClass(CachingMapper.java:47) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.core.util.HierarchicalStreams.readClassType(HierarchicalStreams.java:29) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.readItem(AbstractCollectionConverter.java:72) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.converters.collections.CollectionConverter.addCurrentElementToCollection(CollectionConverter.java:98) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.converters.collections.CollectionConverter.populateCollection(CollectionConverter.java:91) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.converters.collections.CollectionConverter.populateCollection(CollectionConverter.java:85) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.converters.collections.CollectionConverter.unmarshal(CollectionConverter.java:80) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:70) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshallField(AbstractReflectionConverter.java:503) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:429) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:281) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:70) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:134) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:32) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1230) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1214) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.XStream.fromXML(XStream.java:1085) ~[xstream-1.4.9.jar:1.4.9] 
    at com.thoughtworks.xstream.XStream.fromXML(XStream.java:1076) ~[xstream-1.4.9.jar:1.4.9] 
    at blahblah.testSpringboot.controllers.TestParser.parse(TestParser.java:39) ~[classes/:na] 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_112] 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_112] 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_112] 
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_112] 
    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) ~[spring-web-4.3.6.RELEASE.jar:4.3.6.RELEASE] 
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133) ~[spring-web-4.3.6.RELEASE.jar:4.3.6.RELEASE] 
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:116) ~[spring-webmvc-4.3.6.RELEASE.jar:4.3.6.RELEASE] 
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827) ~[spring-webmvc-4.3.6.RELEASE.jar:4.3.6.RELEASE] 
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738) ~[spring-webmvc-4.3.6.RELEASE.jar:4.3.6.RELEASE] 
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85) ~[spring-webmvc-4.3.6.RELEASE.jar:4.3.6.RELEASE] 
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963) ~[spring-webmvc-4.3.6.RELEASE.jar:4.3.6.RELEASE] 
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897) ~[spring-webmvc-4.3.6.RELEASE.jar:4.3.6.RELEASE] 
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970) ~[spring-webmvc-4.3.6.RELEASE.jar:4.3.6.RELEASE] 
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861) ~[spring-webmvc-4.3.6.RELEASE.jar:4.3.6.RELEASE] 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:622) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846) ~[spring-webmvc-4.3.6.RELEASE.jar:4.3.6.RELEASE] 
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) ~[tomcat-embed-websocket-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-4.3.6.RELEASE.jar:4.3.6.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.6.RELEASE.jar:4.3.6.RELEASE] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:105) ~[spring-web-4.3.6.RELEASE.jar:4.3.6.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.6.RELEASE.jar:4.3.6.RELEASE] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81) ~[spring-web-4.3.6.RELEASE.jar:4.3.6.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.6.RELEASE.jar:4.3.6.RELEASE] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197) ~[spring-web-4.3.6.RELEASE.jar:4.3.6.RELEASE] 
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-4.3.6.RELEASE.jar:4.3.6.RELEASE] 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:192) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:165) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) ~[tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:474) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:349) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:783) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:798) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1434) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_112] 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_112] 
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.5.11.jar:8.5.11] 
    at java.lang.Thread.run(Thread.java:745) [na:1.8.0_112] 

Я не знаю, где я буду неправильно. Это с моим XML или это то, что я пропустил в своем методе?

ответ

0

Я бы сказал, вы должны изменить свой вклад XML:

... 
<books> 
<book> 
    <name>C++</name> 
    <status>published</status> 
</book> 
<book> 
    <name>xyz</name> 
    <status>unpublished</status> 
</book> 
</books> 
... 

и

xStream.alias("book",Book.class); // rename Books class to Book 

Проблема на данный момент: У вас есть список под названием «книги» в классе автора , Этот список адресован вашим тегом «books». Затем в xml следующий тег будет «name», но первым элементом в вашем списке книг будет книга (а не имя).

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