java - Dropwizard示例在创建新资源时给出400错误

我是Dropwizard框架的新手。我正在尝试创建一个类似于https://github.com/dropwizard/dropwizard/tree/master/dropwizard-example教程中提到的person和people资源的新资源。

我正在创建这样的文档类-

@Entity
@Table(name = "document")
@NamedQueries({
        @NamedQuery(
                name = "com.example.helloworld.core.Document.findAll",
                query = "SELECT d FROM Document d"
        ),
        @NamedQuery(
                name = "com.example.helloworld.core.Document.findById",
                query = "SELECT d FROM Document d WHERE d.Id = :Id"
        )
})
public class Document {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long Id;

    @Column(name = "ProcessingSetID")
    private String ProcessingSetID;

    @Column(name = "processed")
    private String processed;

    public long getId() {
        return Id;
    }

    public void setId(long id) {
        this.Id = id;
    }

    public String getProcessingSetID() {
        return ProcessingSetID;
    }

    public void setProcessingSetID(String processingSetID) {
        ProcessingSetID = processingSetID;
    }

    public String getProcessed() {
        return processed;
    }

    public void setProcessed(String processed) {
        this.processed = processed;
    }
}

我的文件Dao就是这样，

public Optional<Document> findById(Long id) {
    return Optional.fromNullable(get(id));
}

public Document create(Document document) {
    return persist(document);
}

public List<Document> findAll() {
    return list(namedQuery("com.example.helloworld.core.Document.findAll"));
}
}

我正在尝试在我的文档资源上调用POST方法，

@Path("/documents")
@Produces(MediaType.APPLICATION_JSON)

public class DocumentsResource {

    private final DocumentDao documentDAO;
    private static final Logger log = LoggerFactory.getLogger(DocumentsResource.class);

    public DocumentsResource(DocumentDao documentDAO) {
        this.documentDAO = documentDAO;
    }

    @POST
    @UnitOfWork
    public Document createDocument(Document document) {
        log.info("inside POST method of document.");
        System.out.println("inside POST method of document.....");
        return documentDAO.create(document);
    }

    @GET
    @UnitOfWork
    public List<Document> listDocuments() {
        return documentDAO.findAll();
    }
}

但是我从客户请求中得到了400条回复，请在客户请求下方找到

Client client = Client.create();

WebResource webResource = client.resource("http://localhost:8080/documents");

String input = "{\"processed\":\"new process\",\"ProcessingSetID\":\"new iD\"}";

ClientResponse response =
        webResource.type("application/json").post(ClientResponse.class, input);

if (response.getStatus() != 200) {
    throw new RuntimeException("Failed : HTTP error code : "
            + response.getStatus());
}

我尝试调试问题，但该调用最初没有到达POST方法。似乎它不是从JSON字符串创建文档对象，但我看不到这样做的原因。同样，当我直接在数据库中输入条目并进行GET调用时，也会收到与object等效的完美JSON字符串。

最佳答案

要获得有关400错误的有用消息，请在jersey上注册:

environment.jersey().register(new JsonProcessingExceptionMapper(true));

它将给出有关400响应的更详细的消息，对调试很有用。

关于java - Dropwizard示例在创建新资源时给出400错误，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/23307933/