澤西錯誤：MessageBodyReader未找到媒體類型=應用程序/ json

我想實現一個小的REST API使用澤西作爲框架，原則上代碼工作正常，但是當我嘗試做一個哈希'GET'表中，我得到以下錯誤：澤西錯誤：MessageBodyReader未找到媒體類型=應用程序/ json

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

這是問題的行：

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>>(){});

，這是怎麼實現的服務：

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

的pom.xml（行家依賴性）

<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>

服務器側配置：

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..."); 

    } 
}

錯誤在客戶端註冊傑克遜：

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)

新類：

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 + "]"; 
} 


}

術語級別：

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 + "]"; 
} 
}

有人可以幫我請返回地圖嗎？

來源

2014-11-23 Gera

我知道這是一個客戶端問題，但可以顯示服務器應用程序配置 – 2014-11-23 16:26:14

我看到你有兩個不同的供應商依賴關係jersey-media-moxy和jersey-media-json-jackson。我一直有與MOXY Maps問題。我猜他們打得不好。似乎你將需要使用一個適配器，使其發揮很好，如看到here from Blaise Doughan。

這就是說，我要求（在上面的評論中）看到你的服務器端配置，因爲MOXy會自動配置自身，並優先於jersey-media-json-jackson。爲什麼，我不確定，這正是我一直經歷的。所以我很好奇，即使在響應回到客戶端之前，服務器端也沒有失敗。除非您將JacksonFeature與服務器應用程序相關聯，否則您應該將其與客戶端一起配置。（這是唯一的情況，因爲你也有MOXy依賴）。

無論如何，如果你不想通過創建適配器的麻煩，如上面的鏈接所示，只需要擺脫jersey-media-moxy依賴關係。 jersey-media-json-jackson也會自動配置它的功能。你應該只使用一個或另一個。

作爲題外話：

@Path("/getAllNews")。路徑段應該是名詞，除非它們是控制器資源，通常執行一些操作，而不是正常的CRUD操作（例如/register）。 HTTP方法已經由每個CRUD操作應該執行的謂詞組成。

Ç reate - POST
ř etriecve - GET
Ù PDATE = PUT
d elete - DELETE

只是一些語義考慮:-)

UPDATE

的問題是與New關鍵。傑克遜不知道如何反序列化這個。由於您願意切換鍵和值類型，只需更改toString即可返回Term類中的name，並且應該可以。

來源

2014-11-23 16:54:41

感謝您的回答，我更新了所需信息的帖子。正如你所看到的，爲了返回映射，我使用Jackson作爲JSON提供者，將依賴關係添加到pom.xml文件中，並在啓動HttpServer之前將其註冊到ResourceConfig對象中，但仍然不能正常工作... – Gera 2014-11-24 15:30:20

嘗試向客戶端註冊它另外，由於問題出在客戶端（因爲問題出在客戶端上），即'client.register（...）'。由於您仍然有MOXy，客戶可能會隱式註冊到MOXy。 – 2014-11-24 15:34:01

感謝您的幫助，再次，我更新了我註冊客戶端時出現的錯誤信息......我一直在考慮使用適配器，但我不知道如何實現它。 – Gera 2014-11-24 15:57:14

澤西錯誤：MessageBodyReader未找到媒體類型=應用程序/ json

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