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java - 如何在 Jersey Web 应用程序中执行自定义 JSON Marshaller？

问题描述

我正在使用 Jersey 运行一个 Web 应用程序。在我的控制器中，我试图在资源中获取一个文件，并返回一个包含enum. enum里面也有两个字段。当对象被编组时，我收到错误：

jakarta.xml.bind.JAXBException: class java.util.ArrayList nor any of its super class is known to this context.
    at org.glassfish.jaxb.runtime.v2.runtime.JAXBContextImpl.getBeanInfo(JAXBContextImpl.java:541)
    at org.glassfish.jaxb.runtime.v2.runtime.XMLSerializer.childAsRoot(XMLSerializer.java:445)
    at org.glassfish.jaxb.runtime.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:268)
    at org.glassfish.jaxb.runtime.v2.runtime.MarshallerImpl.marshal(MarshallerImpl.java:196)
    at jakarta.xml.bind.helpers.AbstractMarshallerImpl.marshal(AbstractMarshallerImpl.java:80)
    at com.jtv.insights.controller.IngestionController.getIngestionLogDetails(IngestionController.java:194)

我的代码是：

@GET
@Path(value = "/log/details/{fileId}")
@Produces(MediaType.APPLICATION_JSON)
public List<IngestionLogs> getIngestionLogDetails(@PathParam("fileId") String fileId) {
    List<IngestionLogs> logs = new ArrayList<>();
    // added data in list
    try {
        JAXBContext ctx = JAXBContext.newInstance(new Class[] { IngestionLogs.class });
        Marshaller jsonMarshaller = ctx.createMarshaller();
        jsonMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        jsonMarshaller.setAdapter(new LogsAdapter());
        jsonMarshaller.marshal(logs, response.getOutputStream());
        return logs;
        } catch (JAXBException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return new ArrayList<>();
    }

我的对象是：

@XmlJavaTypeAdapter(LogsAdapter.class)
public class IngestionLogs {
    private LogType type;
    private String message;
    private LocalDateTime lastModified;
    private String fileName;
    private int rowNumber;
    private int columnNumber;
    private String cellValue;
    private String columnName;
    // getters & setters
}

如何修复此错误，创建一个自定义函数来编组我的对象并将此列表作为 JSON 返回？

标签： javajersey

解决方案

您可以省略属性映射，并且您的类 com.jtv.insights.tool.model.IngestionLogs 需要有一个不带参数的默认构造函数（public IngestionLogs() {}）。

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