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问题:

泽西岛错误:找不到媒体类型=application/json的MessageBodyReader

阎丰
2023-03-14

我正在尝试使用Jersey作为框架实现一个小的REST API,原则上代码工作正常,但是当我尝试对哈希表进行“GET”时,我得到以下错误:

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.access$600(JerseyInvocation.java:91)
    at org.glassfish.jersey.client.JerseyInvocation$3.call(JerseyInvocation.java:705)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
    at org.glassfish.jersey.internal.Errors.process(Errors.java:228)
    at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:424)
    at org.glassfish.jersey.client.JerseyInvocation.invoke(JerseyInvocation.java:701)
    at org.glassfish.jersey.client.JerseyInvocation$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

这是有问题的一行:

    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>>(){});

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公司。xml(maven依赖项)

<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-jackson</artifactId>
        <version>2.13</version>
    </dependency>
</dependencies>
</project>

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(JacksonFeature.class);
    HttpServer server = JdkHttpServerFactory.createHttpServer(baseUri, config);
    System.out.println("Server started...");

    }
}

在客户端中注册杰克逊时出错:

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.access$600(JerseyInvocation.java:91)
        at org.glassfish.jersey.client.JerseyInvocation$3.call(JerseyInvocation.java:705)
        at org.glassfish.jersey.internal.Errors.process(Errors.java:315)
        at org.glassfish.jersey.internal.Errors.process(Errors.java:297)
        at org.glassfish.jersey.internal.Errors.process(Errors.java:228)
        at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:424)
        at org.glassfish.jersey.client.JerseyInvocation.invoke(JerseyInvocation.java:701)
        at org.glassfish.jersey.client.JerseyInvocation$Builder.method(JerseyInvocation.java:417)
        at org.glassfish.jersey.client.JerseyInvocation$Builder.get(JerseyInvocation.java:313)
        at upf.dad.proyecto.HotTopicDetector.News(HotTopicDetector.java:112)
        at upf.dad.proyecto.ScheduledTestJob3.execute(ScheduledTestJob3.java:11)
        at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
        ... 1 more
    Caused by: com.fasterxml.jackson.databind.JsonMappingException: Can not find a (Map) Key deserializer for type [simple type, class upf.dad.proyecto.New]
        at com.fasterxml.jackson.databind.deser.DeserializerCache._handleUnknownKeyDeserializer(DeserializerCache.java:580)
        at com.fasterxml.jackson.databind.deser.DeserializerCache.findKeyDeserializer(DeserializerCache.java:170)
        at com.fasterxml.jackson.databind.DeserializationContext.findKeyDeserializer(DeserializationContext.java:404)
        at com.fasterxml.jackson.databind.deser.std.MapDeserializer.createContextual(MapDeserializer.java:232)
        at com.fasterxml.jackson.databind.DeserializationContext.handleSecondaryContextualization(DeserializationContext.java:572)
        at com.fasterxml.jackson.databind.DeserializationContext.findRootValueDeserializer(DeserializationContext.java:386)
        at com.fasterxml.jackson.databind.ObjectReader._findRootDeserializer(ObjectReader.java:1380)
        at com.fasterxml.jackson.databind.ObjectReader._bind(ObjectReader.java:1228)
        at com.fasterxml.jackson.databind.ObjectReader.readValue(ObjectReader.java:677)
        at com.fasterxml.jackson.jaxrs.base.ProviderBase.readFrom(ProviderBase.java:777)
        at org.glassfish.jersey.message.internal.ReaderInterceptorExecutor$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)

新类别:

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 + "]";
}


}

术语类:

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 + "]";
}
}

有人能帮我退回地图吗?

共有1个答案

壤驷建德
2023-03-14

我发现您有两个不同的提供商依赖关系< code>jersey-media-moxy和< code > jersey-media-JSON-Jackson 。我一直对MOXy的< code >地图有问题。我猜他们打得不好。似乎你需要使用一个适配器来使它播放得更好,就像Blaise Doughan在这里看到的那样。

话虽如此,我请求(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-jackson。为什么,我不确定,这正是我一直经历的。所以我很好奇为什么服务器端甚至在响应返回给客户端之前就没有失败。除非您将JacksonFeature与服务器应用程序混淆,否则您也应该将其与客户端一起配置。(仅限这种情况,因为您也有MOXy依赖项)。

无论如何,如果您不想经历创建适配器的麻烦,如上面的链接所示,只需摆脱泽西 - 媒体 - moxy依赖性即可。泽西-媒体-json-杰克逊也将自动配置它的功能。您应该只使用其中一个。

顺便说一句:

< code > @ Path("/getAllNews ")。路径段应该是名词,除非它们是控制器资源,通常执行一些动作,而不是正常的CRUD操作(例如< code>/register)。HTTP方法已经包含了每个CRUD操作应该执行的动词。

  • 创建-POST
  • 检索-GET
  • 更新=PUT
  • 删除-删除

只需要考虑一些语义:-)

更新

问题出在< code>New键上。Jackson不知道如何反序列化这个。既然您希望切换键和值的类型,只需更改让< code>toString返回< code>Term类中的< code>name即可。

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