堆栈内存溢出
  简体   繁体   English

从@RestController返回Obj

[英]Return Obj from @RestController

 原文  2015-07-15 11:20:55  6   3    java/ json/ angularjs/ spring

问题描述

Greattings! 很棒！

I have a Spring-MVC Controller that use @RestController to return JsonData ( Spring 4.1.7 ). 我有一个使用@RestController返回JsonData（Spring 4.1.7）的Spring-MVC控制器。

My problem is, if I return a List, it works, but if I try to return a single obj, I get an error without trace! 我的问题是，如果我返回一个List，它可以工作，但是如果我尝试返回一个obj，则会出现一个没有跟踪的错误！ It simples doesn't return. 简单不会回来。

This is how I made the call 这就是我打电话的方式 

 $scope.edit = function edit(id) {
 $http.post(urlBase + 'test/edit/'+id).success(function(data) {
     alert('works');
  }).error(function(data) {
      alert('error' + data);
     });

 };

And this is the controller 这是控制器 

  @RestController
  public class MyController {
      @Autowired 
      MyService myService;

  //THIS DOESN'T WORK
      @RequestMapping(value="/secure/test/edit/{id}", method={RequestMethod.POST,RequestMethod.GET})
      public MyObject editObj(@PathVariable("id") int id) {
          return this.myService.getObjById(id);
      }
  //THIS WORKS
      @RequestMapping(value="/secure/test/edit/{id}", method={RequestMethod.POST,RequestMethod.GET})
      public List<MyObject> editObj(@PathVariable("id") int id) {
          return this.myService.getAll();
      }
  }

UPDATE 更新

I'm getting this error 我收到这个错误 

<html><head><title>Apache Tomcat/7.0.56 - Error report</title><style><!--H1 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:22px;} H2 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:16px;} H3 {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;font-size:14px;} BODY {font-family:Tahoma,Arial,sans-serif;color:black;background-color:white;} B {font-family:Tahoma,Arial,sans-serif;color:white;background-color:#525D76;} P {font-family:Tahoma,Arial,sans-serif;background:white;color:black;font-size:12px;}A {color : black;}A.name {color : black;}HR {color : #525D76;}--></style> </head><body><h1>HTTP Status 500 - Could not write content: No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: sys.barattie.model.Caixa_$$_jvst126_0[&quot;handler&quot;]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: sys.barattie.model.Caixa_$$_jvst126_0[&quot;handler&quot;])</h1><HR size="1" noshade="noshade"><p><b>type</b> Exception report</p><p><b>message</b> <u>Could not write content: No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: sys.barattie.model.Caixa_$$_jvst126_0[&quot;handler&quot;]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: sys.barattie.model.Caixa_$$_jvst126_0[&quot;handler&quot;])</u></p><p><b>description</b> <u>The server encountered an internal error that prevented it from fulfilling this request.</u></p><p><b>exception</b> <pre>org.springframework.http.converter.HttpMessageNotWritableException: Could not write content: No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: sys.barattie.model.Caixa_$$_jvst126_0[&quot;handler&quot;]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: sys.barattie.model.Caixa_$$_jvst126_0[&quot;handler&quot;])
    org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.writeInternal(AbstractJackson2HttpMessageConverter.java:238)
    org.springframework.http.converter.AbstractHttpMessageConverter.write(AbstractHttpMessageConverter.java:208)
    org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:161)
    org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters(AbstractMessageConverterMethodProcessor.java:101)
    org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue(RequestResponseBodyMethodProcessor.java:185)
    org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue(HandlerMethodReturnValueHandlerComposite.java:71)
    org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:126)
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:776)
    org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:705)
    org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:967)
    org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:869)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:646)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:843)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:330)
    org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:118)
    org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:84)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:103)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:113)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:154)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:45)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:150)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:199)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:110)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    org.springframework.security.web.csrf.CsrfFilter.doFilterInternal(CsrfFilter.java:105)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:50)
    org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:87)
    org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:342)
    org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:192)
    org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:160)
    org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
    org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
</pre></p><p><b>root cause</b> <pre>com.fasterxml.jackson.databind.JsonMappingException: No serializer found for class org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) ) (through reference chain: sys.barattie.model.Caixa_$$_jvst126_0[&quot;handler&quot;])
    com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.failForEmpty(UnknownSerializer.java:59)
    com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.serialize(UnknownSerializer.java:26)
    com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:505)
    com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:639)
    com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:152)
    com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:114)
    com.fasterxml.jackson.databind.ObjectMapper.writeValue(ObjectMapper.java:1887)
    org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.writeInternal(AbstractJackson2HttpMessageConverter.java:231)
    org.springframework.http.converter.AbstractHttpMessageConverter

UPDATE 2 更新2

Obj Class 对象类 

  @Entity
  @Table(name = "test")
  public class myObject {

      @Id
      @Column(name = "id")
      @GeneratedValue(strategy = GenerationType.IDENTITY)
      private Integer id;
      @ManyToOne
      @JoinColumn(name = "objb_id", referencedColumnName = "id")
      private Objb objb;
      private String test;

      public Integer getId() {
          return id;
      }
      public void setId(Integer id) {
          this.id = id;
      }
      public Objb getObjb() {
          return objb;
      }
      public void setObjb(Objb objb) {
          this.objb = objb;
      }
      public String getTest() {
          return test;
      }
      public void setTest(String test) {
          this.test = test;
      }
  }

3 个解决方案

解决方案1
 1  2015-07-15 17:41:26

I have tried your code with my class Object and see it works fine. 我已经在我的类Object上尝试过您的代码，并看到它工作正常。 It seems your class MyObject missing something. 看来您的类MyObject缺少某些内容。 Maybe missing implements Serializable . 也许缺少实现Serializable 。

解决方案2
 1 已采纳  2015-07-16 03:51:38

Solution 解

Added to my model class the following annotation 在我的模型类中添加了以下注释 

@JsonIgnoreProperties({"hibernateLazyInitializer", "handler"})

解决方案3
 0  2015-07-15 15:47:27

You can try this 你可以试试这个 

@RequestMapping(value="/secure/test/edit/{id}", method={RequestMethod.POST,RequestMethod.GET})
      public @ResponseBody ResponseEntity<MyObject> editObj(@PathVariable("id") int id) {
          return new ResponseEntity<MyObject>(this.myService.getObjById(id),HttpStatus.OK);
      }

Return ResponseEntity object as Spring can easily generate/parse JSON for this. 返回ResponseEntity对象，因为Spring可以轻松地为此生成/解析JSON。

暂无
暂无

声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.

相关问题 如何从 Spring 中的 RestController 返回 HTML 页面？ - How to return HTML page from RestController in Spring? 如何将 RabbitMQ 生产者的响应返回给 RestController？ - How can I return response from RabbitMQ producer to RestController? 我的RestController不从我的对象返回所有属性 - My RestController dont return all properties from my object Spring RestController：返回 JSON 资源 - Spring RestController: Return JSON resource Spring @RestController无法返回unicode - Spring @RestController cannot return unicode 在 spring restcontroller 响应中返回 ByteArrayResource - return ByteArrayResource in spring restcontroller response 从Spring RestController服务到HTML - Serve To Html From Spring RestController 在TeamCity中从AbstractController中获取Spring RestController - Spring `RestController` from `AbstractController` in TeamCity Spring restController return not found 404 on wildfly - Spring restController return not found 404 on wildfly 如何使用Spring RestController返回FileSystemResource或json？ - How to return FileSystemResource or json with Spring RestController?
相关标签
 
粤ICP备18138465号  © 2020-2024 STACKOOM.COM