Webservice con Gson in primavera

Vorrei utilizzare Gson per i servizi Web nella primavera 4. Ho seguito steps in questo tutorial.Webservice con Gson in primavera

SocialGraphUI-servlet.xml

<?xml version="1.0" encoding="UTF-8"?> 
<beans xmlns="http://www.springframework.org/schema/beans" 
    xmlns:context="http://www.springframework.org/schema/context" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns:mvc="http://www.springframework.org/schema/mvc" 
    xsi:schemaLocation=" 
    http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans-4.0.xsd 
    http://www.springframework.org/schema/mvc 
    http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd 
    http://www.springframework.org/schema/context 
    http://www.springframework.org/schema/context/spring-context-4.0.xsd"> 

    <context:component-scan base-package="socialgraphui.controller" /> 

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> 
     <property name="prefix" value="/WEB-INF/jsp/" /> 
     <property name="suffix" value=".jsp" /> 
    </bean> 

    <mvc:resources mapping="/scripts/**" location="/scripts/" /> 
    <mvc:resources mapping="/styles/**" location="/styles/" /> 
    <mvc:annotation-driven /> 

    <mvc:annotation-driven> 
    <mvc:message-converters> 
     <bean class="com.example.converter.GsonMessageConverter" /> 
     <bean 
        class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"> 
        <property name="prefixJson" value="true" /> 
     </bean> 
    </mvc:message-converters> 
    </mvc:annotation-driven> 

</beans>

GsonMessageConverter.java

public class GsonMessageConverter extends AbstractHttpMessageConverter<Object> 
     implements GenericHttpMessageConverter<Object> { 
    public static final Charset DEFAULT_CHARSET = Charset.forName("UTF-8"); 
    private Gson _gson; 
    private Type _type = null; 
    private boolean _prefixJson = false; 

    /** 
    * Construct a new {@code GsonMessageConverter} with a default 
    * {@link Gson#Gson() Gson}. 
    */ 
    public GsonMessageConverter() { 
     this(new Gson()); 
    } 

    /** 
    * Construct a new {@code GsonMessageConverter}. 
    * 
    * @param serializeNulls 
    *   true to generate json for null values 
    */ 
    public GsonMessageConverter(boolean serializeNulls) { 
     this(serializeNulls ? new GsonBuilder().serializeNulls().create() 
       : new Gson()); 
    } 

    /** 
    * Construct a new {@code GsonMessageConverter}. 
    * 
    * @param gson 
    *   a customized {@link Gson#Gson() Gson} 
    */ 
    public GsonMessageConverter(Gson gson) { 
     super(new MediaType("application", "json", DEFAULT_CHARSET)); 
     setGson(gson); 
    } 

    /** 
    * Sets the {@code Gson} for this view. If not set, a default 
    * {@link Gson#Gson() Gson} is used. 
    * <p> 
    * Setting a custom-configured {@code Gson} is one way to take further 
    * control of the JSON serialization process. 
    * 
    * @throws IllegalArgumentException 
    *    if gson is null 
    */ 
    public void setGson(Gson gson) { 
     Assert.notNull(gson, "'gson' must not be null"); 
     _gson = gson; 
    } 

    public void setType(Type type) { 
     this._type = type; 
    } 

    public Type getType() { 
     return _type; 
    } 

    /** 
    * Indicates whether the JSON output by this view should be prefixed with 
    * "{} &&". Default is false. 
    * <p> 
    * Prefixing the JSON string in this manner is used to help prevent JSON 
    * Hijacking. The prefix renders the string syntactically invalid as a 
    * script so that it cannot be hijacked. This prefix does not affect the 
    * evaluation of JSON, but if JSON validation is performed on the string, 
    * the prefix would need to be ignored. 
    */ 
    public void setPrefixJson(boolean prefixJson) { 
     this._prefixJson = prefixJson; 
    } 

    @Override 
    public boolean canRead(Class<?> clazz, MediaType mediaType) { 
     return canRead(mediaType); 
    } 

    @Override 
    public boolean canRead(Type type, Class<?> contextClass, MediaType mediaType) { 
     return canRead(mediaType); 
    } 

    @Override 
    public boolean canWrite(Class<?> clazz, MediaType mediaType) { 
     return canWrite(mediaType); 
    } 

    @Override 
    protected boolean supports(Class<?> clazz) { 
     // should not be called, since we override canRead/Write instead 
     throw new UnsupportedOperationException(); 
    } 

    /** 
    * Generic types will be processed here. 
    */ 
    @Override 
    public Object read(Type type, Class<?> contextClass, 
      HttpInputMessage inputMessage) 
      throws HttpMessageNotReadableException, IOException { 
     setType(type); 
     return readInternal(null, inputMessage); 
    } 

    @Override 
    protected Object readInternal(Class<?> clazz, HttpInputMessage inputMessage) 
      throws IOException, HttpMessageNotReadableException { 

     Reader json = new InputStreamReader(inputMessage.getBody(), 
       getCharset(inputMessage.getHeaders())); 

     try { 
      Type typeOfT = getType(); 
      if (typeOfT != null) { 
       return _gson.fromJson(json, typeOfT); 
      } else { 
       return _gson.fromJson(json, clazz); 
      } 
     } catch (JsonSyntaxException ex) { 
      throw new HttpMessageNotReadableException("Could not read JSON: " 
        + ex.getMessage(), ex); 
     } catch (JsonIOException ex) { 
      throw new HttpMessageNotReadableException("Could not read JSON: " 
        + ex.getMessage(), ex); 
     } catch (JsonParseException ex) { 
      throw new HttpMessageNotReadableException("Could not read JSON: " 
        + ex.getMessage(), ex); 
     } finally { 
      setType(null); 
     } 
    } 

    @Override 
    protected void writeInternal(Object o, HttpOutputMessage outputMessage) 
      throws IOException, HttpMessageNotWritableException { 

     OutputStreamWriter writer = new OutputStreamWriter(
       outputMessage.getBody(), getCharset(outputMessage.getHeaders())); 

     try { 
      if (this._prefixJson) { 
       writer.append("{} && "); 
      } 
      Type typeOfSrc = getType(); 
      if (typeOfSrc != null) { 
       _gson.toJson(o, typeOfSrc, writer); 
      } else { 
       _gson.toJson(o, writer); 
      } 
      writer.close(); 
     } catch (JsonIOException ex) { 
      throw new HttpMessageNotWritableException("Could not write JSON: " 
        + ex.getMessage(), ex); 
     } 
    } 

    // helpers 

    private Charset getCharset(HttpHeaders headers) { 
     if (headers != null && headers.getContentType() != null 
       && headers.getContentType().getCharSet() != null) { 
      return headers.getContentType().getCharSet(); 
     } 
     return DEFAULT_CHARSET; 
    } 

}

metodo di richiesta Get in SocialGraphUI.java. Esiste un test dell'oggetto e un metodo allNodes, che restituisce un elenco di oggetti di classe Node e allEdges restituisce un elenco di oggetti di classe Edge.

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

     model.addAttribute("nodes", test.allNodes); 
     model.addAttribute("edges", test.allEdges); 
     return "index"; 
    }

ottengo questi messaggi di errore:

type Exception report 

message Servlet.init() for servlet SocialGraphUI threw exception 

description The server encountered an internal error that prevented it from fulfilling this request. 

exception 

javax.servlet.ServletException: Servlet.init() for servlet SocialGraphUI threw exception 
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) 
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) 
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953) 
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) 
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023) 
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) 
    org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) 
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
    java.lang.Thread.run(Thread.java:745) 
root cause 

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mvcUriComponentsContributor': Cannot create inner bean '(inner bean)#1043cc94' of type [org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter] while setting bean property 'handlerAdapter'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#1043cc94': Cannot create inner bean 'com.example.converter.GsonMessageConverter#0' of type [com.example.converter.GsonMessageConverter] while setting bean property 'messageConverters' with key [0]; nested exception is org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [com.example.converter.GsonMessageConverter] for bean with name 'com.example.converter.GsonMessageConverter#0' defined in ServletContext resource [/WEB-INF/SocialGraphUI-servlet.xml]; nested exception is java.lang.ClassNotFoundException: com.example.converter.GsonMessageConverter 
    org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveInnerBean(BeanDefinitionValueResolver.java:290) 
    org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:129) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1456) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1197) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475) 
    org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302) 
    org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228) 
    org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298) 
    org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193) 
    org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:684) 
    org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760) 
    org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482) 
    org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:658) 
    org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:624) 
    org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:672) 
    org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:543) 
    org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:484) 
    org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136) 
    javax.servlet.GenericServlet.init(GenericServlet.java:160) 
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) 
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) 
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953) 
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) 
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023) 
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) 
    org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) 
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
    java.lang.Thread.run(Thread.java:745) 
root cause 

org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#1043cc94': Cannot create inner bean 'com.example.converter.GsonMessageConverter#0' of type [com.example.converter.GsonMessageConverter] while setting bean property 'messageConverters' with key [0]; nested exception is org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [com.example.converter.GsonMessageConverter] for bean with name 'com.example.converter.GsonMessageConverter#0' defined in ServletContext resource [/WEB-INF/SocialGraphUI-servlet.xml]; nested exception is java.lang.ClassNotFoundException: com.example.converter.GsonMessageConverter 
    org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveInnerBean(BeanDefinitionValueResolver.java:290) 
    org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:122) 
    org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveManagedList(BeanDefinitionValueResolver.java:359) 
    org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:157) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1456) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1197) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475) 
    org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveInnerBean(BeanDefinitionValueResolver.java:276) 
    org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:129) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1456) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1197) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475) 
    org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302) 
    org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228) 
    org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298) 
    org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193) 
    org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:684) 
    org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760) 
    org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482) 
    org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:658) 
    org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:624) 
    org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:672) 
    org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:543) 
    org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:484) 
    org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136) 
    javax.servlet.GenericServlet.init(GenericServlet.java:160) 
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) 
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) 
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953) 
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) 
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023) 
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) 
    org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) 
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
    java.lang.Thread.run(Thread.java:745) 
root cause 

org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [com.example.converter.GsonMessageConverter] for bean with name 'com.example.converter.GsonMessageConverter#0' defined in ServletContext resource [/WEB-INF/SocialGraphUI-servlet.xml]; nested exception is java.lang.ClassNotFoundException: com.example.converter.GsonMessageConverter 
    org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1325) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:452) 
    org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveInnerBean(BeanDefinitionValueResolver.java:276) 
    org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:122) 
    org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveManagedList(BeanDefinitionValueResolver.java:359) 
    org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:157) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1456) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1197) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475) 
    org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveInnerBean(BeanDefinitionValueResolver.java:276) 
    org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:129) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1456) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1197) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475) 
    org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302) 
    org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228) 
    org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298) 
    org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193) 
    org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:684) 
    org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760) 
    org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482) 
    org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:658) 
    org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:624) 
    org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:672) 
    org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:543) 
    org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:484) 
    org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136) 
    javax.servlet.GenericServlet.init(GenericServlet.java:160) 
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) 
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) 
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953) 
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) 
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023) 
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) 
    org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) 
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
    java.lang.Thread.run(Thread.java:745) 
root cause 

java.lang.ClassNotFoundException: com.example.converter.GsonMessageConverter 
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714) 
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559) 
    org.springframework.util.ClassUtils.forName(ClassUtils.java:247) 
    org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:395) 
    org.springframework.beans.factory.support.AbstractBeanFactory.doResolveBeanClass(AbstractBeanFactory.java:1346) 
    org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1317) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:452) 
    org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveInnerBean(BeanDefinitionValueResolver.java:276) 
    org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:122) 
    org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveManagedList(BeanDefinitionValueResolver.java:359) 
    org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:157) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1456) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1197) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475) 
    org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveInnerBean(BeanDefinitionValueResolver.java:276) 
    org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:129) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1456) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1197) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537) 
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475) 
    org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:302) 
    org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228) 
    org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:298) 
    org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193) 
    org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:684) 
    org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760) 
    org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482) 
    org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:658) 
    org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:624) 
    org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:672) 
    org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:543) 
    org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:484) 
    org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136) 
    javax.servlet.GenericServlet.init(GenericServlet.java:160) 
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) 
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99) 
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953) 
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) 
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023) 
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589) 
    org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310) 
    java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
    java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
    java.lang.Thread.run(Thread.java:745) 
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.42 logs.

fonte

2014-12-02 Matt

Dove è la tua classe: GsonMessageConverter si trova? hai creato il pacchetto di esempio? – rhinds

@rhinds grazie, hai ragione ho usato il nome del pacchetto sbagliato – Matt

Il problema principale qui potrebbe essere il duplicato mvc:annotation-driven dichiarazione.

Ma comunque, Spring 4.1 introduced Gson support modo che lo rende così facile per voi per raggiungere questo obiettivo:

<?xml version="1.0" encoding="UTF-8"?> 
<beans xmlns="http://www.springframework.org/schema/beans" 
    xmlns:context="http://www.springframework.org/schema/context" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xmlns:mvc="http://www.springframework.org/schema/mvc" 
    xsi:schemaLocation=" 
    http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans.xsd 
    http://www.springframework.org/schema/mvc 
    http://www.springframework.org/schema/mvc/spring-mvc.xsd 
    http://www.springframework.org/schema/context 
    http://www.springframework.org/schema/context/spring-context.xsd"> 

    <context:component-scan base-package="cz.ario.socialgraphui.controller" /> 

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> 
    <property name="prefix" value="/WEB-INF/jsp/" /> 
    <property name="suffix" value=".jsp" /> 
    </bean> 

    <mvc:annotation-driven> 
    <mvc:message-converters> 
     <bean class="org.springframework.http.converter.json.GsonHttpMessageConverter" /> 
     <!-- other HttpMessageConverters you need here --> 
     <!-- Also: why adding Jackson's MessageConverter? Gson should pick JSON serialization in this case --> 
    </mvc:message-converters> 
    </mvc:annotation-driven> 


    <mvc:resources mapping="/scripts/**" location="/scripts/" /> 
    <mvc:resources mapping="/styles/**" location="/styles/" /> 

</beans>

stessa cosa con un esempio JavaConfig:

@Configuration 
@EnableWebMvc 
@ComponentScan("cz.ario.socialgraphui.controller") 
public class WebConfig extends WebMvcConfigurerAdapter { 

    @Bean 
    public InternalResourceViewResolver viewResolver() { 
     InternalResourceViewResolver viewResolver = new InternalResourceViewResolver(); 
     viewResolver.setPrefix("/WEB-INF/views/"); 
     viewResolver.setSuffix(".jsp"); 
     return viewResolver; 
    } 

    @Override 
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) { 
     converters.add(new GsonHttpMessageConverter()); 
     // ... 
    } 

    @Override 
    public void addResourceHandlers(ResourceHandlerRegistry registry) { 
     registry.addResourceHandler("/scripts/**").addResourceLocations("/scripts/"); 
     registry.addResourceHandler("/styles/**").addResourceLocations("/styles/"); 
    } 
}

Nota: è necessario (quasi) mai utilizzare XSD con versione nei file di configurazione XML - see this SO question for more details.

fonte

2014-12-04 10:54:13

Grazie per questa risposta utile. Assegnerò la mia taglia in 20 ore (non posso farlo prima). – Matt

Webservice con Gson in primavera

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