Java Jersey 错误：找不到 Media type=application/json 的 MessageBodyReader

Question

提问by Gera

i'm trying to implement a small REST API using Jersey as framework, in principle the code worked fine but when I try to do a 'GET' of a hash table, I get the following error:

我正在尝试使用 Jersey 作为框架实现一个小型 REST API，原则上代码运行良好，但是当我尝试对哈希表执行“GET”操作时，出现以下错误：

nov 23, 2014 4:27:40 PM org.glassfish.jersey.message.internal.ReaderInterceptorExecutor$TerminalReaderInterceptor aroundReadFrom
GRAVE: MessageBodyReader not found for media type=application/json, type=interface java.util.Map, genericType=java.util.Map<upf.dad.proyecto.New, upf.dad.proyecto.Term>.
1440 [DefaultQuartzScheduler_Worker-3] ERROR org.quartz.core.JobRunShell - Job DEFAULT.testJob3 threw an unhandled Exception: 
org.glassfish.jersey.message.internal.MessageBodyProviderNotFoundException: MessageBodyReader not found for media type=application/json, type=interface java.util.Map, genericType=java.util.Map<upf.dad.proyecto.New, upf.dad.proyecto.Term>.
    at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor$TerminalReaderInterceptor.aroundReadFrom(ReaderInterceptorExecutor.java:230)
    at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor.proceed(ReaderInterceptorExecutor.java:154)
    at org.glassfish.jersey.message.internal.MessageBodyFactory.readFrom(MessageBodyFactory.java:1124)
    at org.glassfish.jersey.message.internal.InboundMessageContext.readEntity(InboundMessageContext.java:851)
    at org.glassfish.jersey.message.internal.InboundMessageContext.readEntity(InboundMessageContext.java:810)
)
    at org.glassfish.jersey.client.JerseyInvocation$Builder.get(JerseyInvocation.java:313)
    at upf.dad.proyecto.HotTopicDetector.News(HotTopicDetector.java:110)
    at upf.dad.proyecto.ScheduledTestJob3.execute(ScheduledTestJob3.java:11)
1440 [DefaultQuartzScheduler_Worker-3] ERROR org.quartz.core.ErrorLogger - Job (DEFAULT.testJob3 threw an exception.
org.quartz.SchedulerException: Job threw an unhandled exception. [See nested exception: org.glassfish.jersey.message.internal.MessageBodyProviderNotFoundException: MessageBodyReader not found for media type=application/json, type=interface java.util.Map, genericType=java.util.Map<upf.dad.proyecto.New, upf.dad.proyecto.Term>.]
    at org.quartz.core.JobRunShell.run(JobRunShell.java:213)
    at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:573)
Caused by: org.glassfish.jersey.message.internal.MessageBodyProviderNotFoundException: MessageBodyReader not found for media type=application/json, type=interface java.util.Map, genericType=java.util.Map<upf.dad.proyecto.New, upf.dad.proyecto.Term>.
    at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor$TerminalReaderInterceptor.aroundReadFrom(ReaderInterceptorExecutor.java:230)
    at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor.proceed(ReaderInterceptorExecutor.java:154)
    at org.glassfish.jersey.message.internal.MessageBodyFactory.readFrom(MessageBodyFactory.java:1124)
    at org.glassfish.jersey.message.internal.InboundMessageContext.readEntity(InboundMessageContext.java:851)
    at org.glassfish.jersey.message.internal.InboundMessageContext.readEntity(InboundMessageContext.java:810)
    at org.glassfish.jersey.client.ClientResponse.readEntity(ClientResponse.java:368)
    at org.glassfish.jersey.client.JerseyInvocation.translate(JerseyInvocation.java:846)
    at org.glassfish.jersey.client.JerseyInvocation.access0(JerseyInvocation.java:91)
    at org.glassfish.jersey.client.JerseyInvocation.call(JerseyInvocation.java:705)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:228)
    at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:424)
    at org.glassfish.jersey.client.JerseyInvocation.invoke(JerseyInvocation.java:701)
    at org.glassfish.jersey.client.JerseyInvocation$Builder.method(JerseyInvocation.java:417)
    at org.glassfish.jersey.client.JerseyInvocation$Builder.get(JerseyInvocation.java:313)
    at upf.dad.proyecto.HotTopicDetector.News(HotTopicDetector.java:110)
    at upf.dad.proyecto.ScheduledTestJob3.execute(ScheduledTestJob3.java:11)
    at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
    ... 1 more

This is the problematic line:

这是有问题的行：

    Client client = ClientBuilder.newClient();

    WebTarget targetGetAllNews = client.target("http://localhost:15000").path("news/getAllNews");


    Map<New, Term> NewsAll = targetGetAllNews.request(
             MediaType.APPLICATION_JSON_TYPE).get(new GenericType<Map<New, Term>>(){});

and this is how I implemented the service:

这就是我实现服务的方式：

@GET
@Path("/getAllNews")
@Produces(MediaType.APPLICATION_JSON)
public Map<New, Term> getAllNews() {
    return NewsCrawler.getNewAndTerm();
}

pom.xml (maven dependencies)

pom.xml (maven 依赖)

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>upf.dad.proyecto</groupId>
<artifactId>JAXRS-proyecto</artifactId>
<version>0.0.1-SNAPSHOT</version>
<dependencies>
<!-- Rome RSS and Atom utilities @ http://rometools.github.io/rome/ -->        
<dependency>
        <groupId>rome</groupId>
        <artifactId>rome</artifactId>             
        <version>1.0</version>
</dependency>

<!-- jsoup HTML parser library @ http://jsoup.org/ -->         
<dependency>             
        <groupId>org.jsoup</groupId>             
        <artifactId>jsoup</artifactId>             
        <version>1.8.1</version>               
</dependency>
    <dependency>
        <groupId>org.quartz-scheduler</groupId>
        <artifactId>quartz</artifactId>
        <version>2.2.1</version>
    </dependency>
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-simple</artifactId>
        <version>1.6.1</version>
    </dependency>
    <dependency>
        <groupId>org.twitter4j</groupId>
        <artifactId>twitter4j-core</artifactId>
        <version>4.0.2</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.containers</groupId>
        <artifactId>jersey-container-servlet</artifactId>
        <version>2.12</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.containers</groupId>
        <artifactId>jersey-container-jdk-http</artifactId>
        <version>2.12</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.media</groupId>
        <artifactId>jersey-media-moxy</artifactId>
        <version>2.12</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.core</groupId>
        <artifactId>jersey-client</artifactId>
        <version>2.12</version>
    </dependency>
    <dependency>
        <groupId>org.glassfish.jersey.media</groupId>
        <artifactId>jersey-media-json-Hymanson</artifactId>
        <version>2.13</version>
    </dependency>
</dependencies>
</project>

Server side configuration:

服务器端配置：

public class NewsCrawlerRestServer {

public static void main(String[] args) throws IOException {

    URI baseUri = UriBuilder.fromUri("http://localhost/").port(15000).build();
    ResourceConfig config = new ResourceConfig(NewsCrawlerServices.class, HotTopicDetectorServices.class);
    config.register(HymansonFeature.class);
    HttpServer server = JdkHttpServerFactory.createHttpServer(baseUri, config);
    System.out.println("Server started...");

    }
}

Error registering Hymanson in the client:

在客户端注册 Hymanson 时出错：

org.quartz.SchedulerException: Job threw an unhandled exception. [See nested exception: javax.ws.rs.ProcessingException: Error reading entity from input stream.]
        at org.quartz.core.JobRunShell.run(JobRunShell.java:213)
        at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:573)
    Caused by: javax.ws.rs.ProcessingException: Error reading entity from input stream.
        at org.glassfish.jersey.message.internal.InboundMessageContext.readEntity(InboundMessageContext.java:866)
        at org.glassfish.jersey.message.internal.InboundMessageContext.readEntity(InboundMessageContext.java:810)
        at org.glassfish.jersey.client.ClientResponse.readEntity(ClientResponse.java:368)
        at org.glassfish.jersey.client.JerseyInvocation.translate(JerseyInvocation.java:846)
        at org.glassfish.jersey.client.JerseyInvocation.access0(JerseyInvocation.java:91)
        at org.glassfish.jersey.client.JerseyInvocation.call(JerseyInvocation.java:705)
        at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
        at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
        at org.glassfish.jersey.internal.Errors.process(Errors.java:228)
        at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:424)
        at org.glassfish.jersey.client.JerseyInvocation.invoke(JerseyInvocation.java:701)
        at org.glassfish.jersey.client.JerseyInvocation$Builder.method(JerseyInvocation.java:417)
        at org.glassfish.jersey.client.JerseyInvocation$Builder.get(JerseyInvocation.java:313)
        at upf.dad.proyecto.HotTopicDetector.News(HotTopicDetector.java:112)
        at upf.dad.proyecto.ScheduledTestJob3.execute(ScheduledTestJob3.java:11)
        at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
        ... 1 more
    Caused by: com.fasterxml.Hymanson.databind.JsonMappingException: Can not find a (Map) Key deserializer for type [simple type, class upf.dad.proyecto.New]
        at com.fasterxml.Hymanson.databind.deser.DeserializerCache._handleUnknownKeyDeserializer(DeserializerCache.java:580)
        at com.fasterxml.Hymanson.databind.deser.DeserializerCache.findKeyDeserializer(DeserializerCache.java:170)
        at com.fasterxml.Hymanson.databind.DeserializationContext.findKeyDeserializer(DeserializationContext.java:404)
        at com.fasterxml.Hymanson.databind.deser.std.MapDeserializer.createContextual(MapDeserializer.java:232)
        at com.fasterxml.Hymanson.databind.DeserializationContext.handleSecondaryContextualization(DeserializationContext.java:572)
        at com.fasterxml.Hymanson.databind.DeserializationContext.findRootValueDeserializer(DeserializationContext.java:386)
        at com.fasterxml.Hymanson.databind.ObjectReader._findRootDeserializer(ObjectReader.java:1380)
        at com.fasterxml.Hymanson.databind.ObjectReader._bind(ObjectReader.java:1228)
        at com.fasterxml.Hymanson.databind.ObjectReader.readValue(ObjectReader.java:677)
        at com.fasterxml.Hymanson.jaxrs.base.ProviderBase.readFrom(ProviderBase.java:777)
        at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor$TerminalReaderInterceptor.invokeReadFrom(ReaderInterceptorExecutor.java:264)
        at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor$TerminalReaderInterceptor.aroundReadFrom(ReaderInterceptorExecutor.java:234)
        at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor.proceed(ReaderInterceptorExecutor.java:154)
        at org.glassfish.jersey.message.internal.MessageBodyFactory.readFrom(MessageBodyFactory.java:1124)
        at org.glassfish.jersey.message.internal.InboundMessageContext.readEntity(InboundMessageContext.java:851)

New Class:

新班级：

package upf.dad.proyecto;

import java.util.Date;

public class New {

private String tittle;
private String description;
private Date date;
private String link;

public New(){

}

public New(String t, String d, Date date, String l){
    this.tittle = t;
    this.description = d;
    this.date = date;
    this.link = l;
}

public String getTittle() {
    return tittle;
}

public void setTittle(String tittle) {
    this.tittle = tittle;
}

public String getDescription() {
    return description;
}

public void setDescription(String description) {
    this.description = description;
}

public Date getDate() {
    return date;
}

public void setDate(Date date) {
    this.date = date;
}

public String getLink() {
    return link;
}

public void setLink(String link) {
    this.link = link;
}

@Override
public String toString() {
    return "New [tittle=" + tittle + ", description=" + description
            + ", date=" + date + ", link=" + link + "]";
}


}

Term class:

学期类：

package upf.dad.proyecto;

public class Term {

private String word;

public Term(){

}

public Term(String word){
    this.word = word;

}

public String getWord(){
    return word;
}

public void setWord(String _word){
    word = _word;
}

@Override
public String toString() {
    return "Termino =" + word + "]";
}
}

can someone help me please to return the map?

有人可以帮我把地图还回来吗？

Answer 1

采纳答案by Paul Samsotha

I see you have two different provider dependencies jersey-media-moxyand jersey-media-json-Hymanson. I've always had a problem with Mapswith MOXy. I guess they don't play well. Seems you will need to use an adapter to make it play nice, as seen here from Blaise Doughan.

我看到您有两个不同的提供程序依赖项jersey-media-moxy和jersey-media-json-Hymanson. 我一直对MapsMOXy有问题。我猜他们打得不好。似乎您需要使用适配器才能使其播放良好，如Blaise Doughan 所见。

That being said, I requested (in the comments above) to see your Server side configuration, as MOXy will auto configure itself, and take precedence over the jersey-media-json-Hymanson. Why, I'm not sure, this is just what I've always experienced. So I'm curious how the Server side didn't fail even before the response came back to the client. Unless you confgiure the HymansonFeaturewith the server application, in which you should have also configured it with the client. (This is only the case, because you also have MOXy dependency).

话虽如此，我要求（在上面的评论中）查看您的服务器端配置，因为 MOXy 将自动配置自己，并优先于jersey-media-json-Hymanson. 为什么，我不确定，这正是我一直以来的经历。所以我很好奇服务器端如何在响应返回给客户端之前没有失败。除非您HymansonFeature使用服务器应用程序进行配置，否则您也应该使用客户端对其进行配置。（这只是这种情况，因为您也有 MOXy 依赖性）。

Anyway, if you don't want to go through the hassle creating adapters, as seen in the link above, just get rid of the jersey-media-moxydependency. jersey-media-json-Hymansonwill also auto configure it feature. You should just use one or the other.

无论如何，如果您不想麻烦地创建适配器，如上面的链接所示，只需摆脱jersey-media-moxy依赖即可。jersey-media-json-Hymanson还将自动配置它的功能。您应该只使用其中一种。

As an aside:

作为旁白：

@Path("/getAllNews"). Path segments should be nouns, unless they are controller resources, which normally perform some action, other than normal CRUD operations (e.g. /register). The HTTP method already consists of the verb to which each CRUD action should be performed.

@Path("/getAllNews"). 路径段应该是名词，除非它们是控制器资源，它们通常执行某些操作，而不是正常的 CRUD 操作（例如/register）。HTTP 方法已经包含每个 CRUD 操作应该执行的动词。

Create - POST
Retriecve - GET
Update = PUT
Delete - DELETE

çreate - POST
[Retriecve - GET
更新= PUT
delete -删除

Just some semantics to consider :-)

只是需要考虑一些语义:-)

UPDATE

更新

The problem is with the Newkey. Hymanson doesn't know how to deserialize this. Since you are willing wot switch the key and value type, just change have the toStringreturn the namein the Termclass, and it should be ok.

问题出在New钥匙上。Hymanson 不知道如何反序列化它。既然你愿意WOT切换键和值的类型，只是改变有toString回报name的Term类，它应该没问题。

Java Jersey 错误：找不到 Media type=application/json 的 MessageBodyReader

提问by Gera

采纳答案by Paul Samsotha

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Java Jersey 错误：找不到 Media type=application/json 的 MessageBodyReader

提问by Gera

采纳答案by Paul Samsotha

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