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java.lang.IllegalArgumentException: No converter found for return value of type

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夕颜 2020-11-30 00:04

With this code

@RequestMapping(value = \"/bar/foo\", method = RequestMethod.GET)
    public ResponseEntity foo() {

        Foo model;
        ...
20条回答
  • 旧巷少年郎
    旧巷少年郎 (楼主)
    2020-11-30 00:56

    While using Spring Boot 2.2 I run into a similiar error message and while googling my error message

    No converter for [class java.util.ArrayList] with preset Content-Type 'null'

    this question here is on top, but all answers here did not work for me, so I think it's a good idea to add the answer I found myself:

    I had to add the following dependencies to the pom.xml:

    
  org.springframework
  spring-oxm



  com.thoughtworks.xstream
  xstream
  1.4.11.1

    After this I need to add the following to the WebApplication class:

    @SpringBootApplication
public class WebApplication
 {
  // ...

  @Bean
  public HttpMessageConverter createXmlHttpMessageConverter()
   {
    final MarshallingHttpMessageConverter xmlConverter = new MarshallingHttpMessageConverter();
    final XStreamMarshaller xstreamMarshaller = new XStreamMarshaller();
    xstreamMarshaller.setAutodetectAnnotations(true);
    xmlConverter.setMarshaller(xstreamMarshaller);
    xmlConverter.setUnmarshaller(xstreamMarshaller);
    return xmlConverter;
   }

}



    Last but not least within my @Controller I used:
    


    @GetMapping(produces = {MediaType.APPLICATION_XML_VALUE, MediaType. APPLICATION_JSON_VALUE})
@ResponseBody
public List listXmlJson(final Model model)
 {
  return this.service.list();
 }

    


    So now I got JSON and XML return values depending on the requests Accept header.
    


    To make the XML output more readable (remove the complete package name from tag names) you could also add @XStreamAlias the following to your entity class:
    


    @Table("ExampleTypes")
@XStreamAlias("ExampleType")
public class ExampleTypeEntity
 {
  // ...
 }

    


    Hopefully this will help others with the same problem.
    
    
    
             
    
                                                        
    
            
            
    
              
                
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