没有找到具有空构造函数的简单POJO的Jersey MessageBodyWriter

Question

此应用程序只是mqtt代理和另一个REST接口之间的接口，因此它不是一个完整的REST应用程序。 （传入的mqtt消息被处理并通过POST请求发送到REST接口。）

如果我使用java.net.HttpURLConnection和Gson发送带有JSON有效负载的POST请求，它可以正常工作，但我也希望将其与javax.ws.rs.client.Client和javax.ws.rs.core.Response一起使用，因为以后可能需要SSL支持，我已经知道如何用Jersey提供。既然我认为我有正确的依赖关系，并且POJO有一个非常简单的结构和空构造函数，我无法找出导致问题的原因。以下是相关代码：

我想发送的POJO：

public class NumData {

private String meas_loc_site;
private int meas_loc_id;
private String gmt_event;
private String eu_db_site;
private int eu_db_id;
private int eu_type_code;
private float data_value;

public NumData(){
}

public NumData(String meas_loc_site, int meas_loc_id, String gmt_event, String eu_db_site, int eu_db_id,
        int eu_type_code, float data_value) {
    super();
    this.meas_loc_site = meas_loc_site;
    this.meas_loc_id = meas_loc_id;
    this.gmt_event = gmt_event;
    this.eu_db_site = eu_db_site;
    this.eu_db_id = eu_db_id;
    this.eu_type_code = eu_type_code;
    this.data_value = data_value;
}

public String getMeas_loc_site() {
    return meas_loc_site;
}

public void setMeas_loc_site(String meas_loc_site) {
    this.meas_loc_site = meas_loc_site;
}

public int getMeas_loc_id() {
    return meas_loc_id;
}

public void setMeas_loc_id(int meas_loc_id) {
    this.meas_loc_id = meas_loc_id;
}

public String getGmt_event() {
    return gmt_event;
}

public void setGmt_event(String gmt_event) {
    this.gmt_event = gmt_event;
}

public String getEu_db_site() {
    return eu_db_site;
}

public void setEu_db_site(String eu_db_site) {
    this.eu_db_site = eu_db_site;
}

public int getEu_db_id() {
    return eu_db_id;
}

public void setEu_db_id(int eu_db_id) {
    this.eu_db_id = eu_db_id;
}

public int getEu_type_code() {
    return eu_type_code;
}

public void setEu_type_code(int eu_type_code) {
    this.eu_type_code = eu_type_code;
}

public float getData_value() {
    return data_value;
}

public void setData_value(float data_value) {
    this.data_value = data_value;
}


}

使用泽西图书馆发送请求的效用函数：

    public static <T> Response sendRequest(String URI, String method, T payload) throws Exception {

    Response response = null;
    ClientConfig configuration = new ClientConfig();
    configuration.property(ClientProperties.CONNECT_TIMEOUT, 30000);
    configuration.property(ClientProperties.READ_TIMEOUT, 30000);
    Client client = ClientBuilder.newClient(configuration);

    WebTarget target = client.target(UriBuilder.fromUri(URI).build());
    switch (method) {
    case "GET":
        response = target.request().header("Content-type", "application/json").get();
        break;
    case "POST":
        System.out.println("test1");
        response = target.request().header("Content-type", "application/json").post(Entity.json(payload));
        System.out.println("test2");
        break;
    case "PUT":
        response = target.request().header("Content-type", "application/json").put(Entity.json(payload));
        break;
    case "DELETE":
        response = target.request().header("Content-type", "application/json").delete();
        break;
    default:
        throw new Exception("Invalid method type was given to the Utility.sendRequest() method");
    }

    if (response == null || response.getStatus() == 500 || response.getStatus() == 400 || response.getStatus() == 404) {
        throw new Exception("Response is null or the response status code is: 400, 404 or 500");
    }

    return response;
}

pom.xml依赖项:(版本为2.25.1）

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.glassfish.jersey</groupId>
            <artifactId>jersey-bom</artifactId>
            <version>${jersey.version}</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

<dependencies>
    <dependency>
        <groupId>org.glassfish.jersey.containers</groupId>
        <artifactId>jersey-container-servlet-core</artifactId>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.media</groupId>
        <artifactId>jersey-media-moxy</artifactId>
    </dependency>
    <dependency>
        <groupId>com.google.code.gson</groupId>
        <artifactId>gson</artifactId>
        <version>2.8.1</version>
    </dependency>
    <dependency>
        <groupId>org.eclipse.paho</groupId>
        <artifactId>org.eclipse.paho.client.mqttv3</artifactId>
        <version>1.1.1</version>
    </dependency>
</dependencies>

我也尝试使用jersey-media-json-jackson，但问题仍然存在。

和堆栈跟踪:(抱歉，不知道如何修复此处的副本）

org.glassfish.jersey.message.internal.WriterInterceptorExecutor$TerminalWriterInterceptor aroundWriteTo

SEVERE：找不到媒体类型= application / json的MessageBodyWriter，type = class my.package.NumData，genericType = class my.package.NumData。 org.glassfish.jersey.message.internal.MessageBodyProviderNotFoundException：找不到媒体类型= application / json的MessageBodyWriter，type = class my.package.NumData，genericType = class my.package.NumData。         at org.glassfish.jersey.message.internal.WriterInterceptorExecutor $ TerminalWriterInterceptor.aroundWriteTo（WriterInterceptorExecutor.java:247）         在org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed（WriterInterceptorExecutor.java:162）         在org.glassfish.jersey.message.internal.MessageBodyFactory.writeTo（MessageBodyFactory.java:1130）         在org.glassfish.jersey.client.ClientRequest.doWriteEntity（ClientRequest.java:517）         在org.glassfish.jersey.client.ClientRequest.writeEntity（ClientRequest.java:499）         在org.glassfish.jersey.client.internal.HttpUrlConnector._apply（HttpUrlConnector.java:393）         在org.glassfish.jersey.client.internal.HttpUrlConnector.apply（HttpUrlConnector.java:285）         在org.glassfish.jersey.client.ClientRuntime.invoke（ClientRuntime.java:252）         在org.glassfish.jersey.client.JerseyInvocation $ 1.call（JerseyInvocation.java:684）         在org.glassfish.jersey.client.JerseyInvocation $ 1.call（JerseyInvocation.java:681）         在org.glassfish.jersey.internal.Errors.process（Errors.java:315）         在org.glassfish.jersey.internal.Errors.process（Errors.java:297）         在org.glassfish.jersey.internal.Errors.process（Errors.java:228）         在org.glassfish.jersey.process.internal.RequestScope.runInScope（RequestScope.java:444）         在org.glassfish.jersey.client.JerseyInvocation.invoke（JerseyInvocation.java:681）         在org.glassfish.jersey.client.JerseyInvocation $ Builder.method（JerseyInvocation.java:437）         在org.glassfish.jersey.client.JerseyInvocation $ Builder.post（JerseyInvocation.java:343）         at eu.mantis.mqtt_mimosa.Utility.sendRequest（Utility.java:53）         at eu.mantis.mqtt_mimosa.Main.sendEnviromentMeasToMimosa（Main.java:155）         在eu.mantis.mqtt_mimosa.Main.messageArrived（Main.java:79）         在org.eclipse.paho.client.mqttv3.internal.CommsCallback.deliverMessage（CommsCallback.java:477）         在org.eclipse.paho.client.mqttv3.internal.CommsCallback.handleMessage（CommsCallback.java:380）         在org.eclipse.paho.client.mqttv3.internal.CommsCallback.run（CommsCallback.java:184）         在java.lang.Thread.run（未知来源）