Springboot HttpMessageNotWritableException:没有带有预设内容类型“null"的 [...] 转换器] [英] Springboot HttpMessageNotWritableException: No converter for [...] with preset Content-Type 'null']

问题描述

我尝试使用 Springboot 2.2.4.RELEASE + JDK11 和 java 8 编译使用 XML 和 JSON 创建 Web API.

I try create web API with XML and JSON with Springboot 2.2.4.RELEASE + JDK11 and java 8 compilation.

我的模型:

@XmlRootElement
public class DataModel {

    private List<String> columns;

    private List<Row> rows;

    public List<String> getColumns() {
        return columns;
    }

    public void setColumns(List<String> columns) {
        this.columns = columns;
    }

    public List<Row> getRows() {
        return rows;
    }

    public void setRows(List<Row> rows) {
        this.rows = rows;
    }

}

我的控制器:

@RequestMapping(value = "/{model}/columns", method = RequestMethod.GET, consumes = MediaType.ALL_VALUE, produces = { MediaType.APPLICATION_XML_VALUE, MediaType.APPLICATION_JSON_VALUE })
public ResponseEntity<DataModel> getColumnsModel(@PathVariable String model) {
    LOGGER.info("getColumnsModel : model[{}]", model);
    DataModel dataModel = modelService.getColumns(model);
    return Optional.ofNullable(dataModel).map(result -> new ResponseEntity<>(result, HttpStatus.OK)).orElse(new ResponseEntity<>(HttpStatus.NO_CONTENT));
}

我使用卷曲:

curl -s -v --header "Accept: application/xml" http://localhost:8084/api/foo/columns

在我的电脑(Windows 10)上结果正常.

On my computer (windows 10) the result is OK.

* TCP_NODELAY set
* Connected to localhost (::1) port 8084 (#0)
> GET /noraui/api/hello/columns HTTP/1.1
> Host: localhost:8084
> User-Agent: curl/7.67.0
> Accept: application/xml
>
* Mark bundle as not supporting multiuse
< HTTP/1.1 200
< X-Content-Type-Options: nosniff
< X-XSS-Protection: 1; mode=block
< Cache-Control: no-cache, no-store, max-age=0, must-revalidate
< Pragma: no-cache
< Expires: 0
< X-Frame-Options: DENY
< Content-Type: application/xml
< Transfer-Encoding: chunked
< Date: Tue, 03 Mar 2020 08:38:20 GMT
<
{ [254 bytes data]
* Connection #0 to host localhost left intact

我在 Unix 平台 (travis-ci) 上的错误:

Resolved [org.springframework.http.converter.HttpMessageNotWritableException: No converter for [class com.github.noraui.data.rest.DataModel] with preset Content-Type 'null']

< HTTP/1.1 500 
< X-Content-Type-Options: nosniff
< X-XSS-Protection: 1; mode=block
< Cache-Control: no-cache, no-store, max-age=0, must-revalidate
< Pragma: no-cache
< Expires: 0
< X-Frame-Options: DENY
< Content-Length: 0
< Date: Tue, 03 Mar 2020 08:41:28 GMT
< Connection: close
< 
* Closing connection 0

推荐答案

我添加了这个依赖

<dependency>
    <groupId>org.glassfish.jaxb</groupId>
    <artifactId>jaxb-runtime</artifactId>
</dependency>

这篇关于Springboot HttpMessageNotWritableException:没有带有预设内容类型“null"的 [...] 转换器]的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！