RestEasy 客户端提供找不到内容类型应用程序/xml 类型的编写器答案

【问题标题】：RestEasy Client giving could not find writer for content-type application/xml typeRestEasy 客户端提供找不到内容类型应用程序/xml 类型的编写器
【发布时间】：2020-04-24 12:08:25
【问题描述】：

我正在为我的端点编写一个测试客户端，但它无法执行提供的连接

EXCEPTION : could not find writer for content-type application/xml type: com.gepower.gees.ifs.goet.porequest.model.CreatePOReq

在行中

ClientResponse<CreatePOResp> clientResponse = client.post(CreatePOResp.class);

从 Postman，端点返回结果很好。我试图在我的项目中添加所有 RestEasy jar，但它仍然给出同样的错误，而

public static CreatePOResp createUpdateALFPO(CreatePOReq req) {
    CreatePOResp response = new CreatePOResp();
    String operation = "createUpdatePO";

    try {

        String xmlReq = "";
        try {
            xmlReq = XmlUtils.marshalXmlToString(req);
            System.out.println(operation + " - XML SOAP REQUEST: " + xmlReq);
        } catch (Exception xmlex) {
            System.out.println(xmlex.getMessage());
        }
        ClientRequest client = new ClientRequest("http://localhost/ofsrestws/fs/porequest/addpo");

        client.body(MediaType.APPLICATION_XML, req);
        System.out.println("URI ====" + client.getUri());
        ClientResponse<CreatePOResp> clientResponse = client.post(CreatePOResp.class);
        ResteasyProviderFactory.getInstance().addBuiltInMessageBodyReader(new JAXBXmlTypeProvider());

        if (clientResponse.getStatus() == 200) {
            response = clientResponse.getEntity();
            System.out.println("web service is OK");
            return response;
        } else {
            System.out.println("an issue has occure during the call of the web service: "
                    + clientResponse.getResponseStatus());
            // Object resp = clientResponse.getResponseStatus();

            return null;
        }
    } catch (NullPointerException e) {
        System.out.println("EXCEPTION : " + e.getMessage());
        return null;
    } catch (Exception e) {
        System.out.println("EXCEPTION : " + e.getMessage());
        return null;
    } finally {}
}

堆栈跟踪：

java.lang.RuntimeException: could not find writer for content-type application/xml type: com.gepower.gees.ifs.goet.porequest.model.CreatePOReq
    at org.jboss.resteasy.client.ClientRequest.writeRequestBody(ClientRequest.java:409)
    at org.jboss.resteasy.client.core.executors.ApacheHttpClientExecutor$ClientRequestEntity.<init>(ApacheHttpClientExecutor.java:117)
    at org.jboss.resteasy.client.core.executors.ApacheHttpClientExecutor.loadHttpMethod(ApacheHttpClientExecutor.java:188)
    at org.jboss.resteasy.client.core.executors.ApacheHttpClientExecutor.execute(ApacheHttpClientExecutor.java:56)
    at org.jboss.resteasy.client.ClientRequest.execute(ClientRequest.java:378)
    at org.jboss.resteasy.client.ClientRequest.httpMethod(ClientRequest.java:590)
    at org.jboss.resteasy.client.ClientRequest.post(ClientRequest.java:496)
    at org.jboss.resteasy.client.ClientRequest.post(ClientRequest.java:501)
    at org.tcs.TestJava.createUpdateALFPO(TestJava.java:52)
    at org.tcs.TestJava.main(TestJava.java:31)

请找到依赖列表

【问题讨论】：

这通常是依赖问题。你确定你的类路径中有 resteasy-jaxb-provider 吗？
看看这里：stackoverflow.com/questions/40111268/… 如果这不能解决问题，请告诉我们您使用的依赖项。
正如您在屏幕截图中看到的 -resteasy-jaxb-provider-3.0.9.Final.jar 在那里
添加依赖列表

标签： java xml jboss jaxb resteasy

【解决方案1】：

我唯一能看到的是您在发出 post 请求后注册了适配器：

ClientResponse<CreatePOResp> clientResponse = client.post(CreatePOResp.class);
ResteasyProviderFactory.getInstance().addBuiltInMessageBodyReader(new JAXBXmlTypeProvider());

由于post调用中出现异常，或许你应该尝试切换顺序。

我注意到您正在使用已弃用的 RestEasy 客户端 API。请注意，JAX-RS 2.0 客户端实现将自动加载所有可用的提供者类（通过服务加载器机制）。也许你应该考虑改用那个 API。

【讨论】：