我正在尝试使用 Jersey 作为框架来实现一个小型 REST API，原则上代码工作正常但是当我尝试对哈希表执行“GET”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.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.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...");
}
}
在客户端注册 Jackson 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:
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 + "]";
}
}
词类:
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 + "]";
}
}
谁能帮我把 map 还给我？
最佳答案
我看到您有两个不同的提供程序依赖项 jersey-media-moxy 和 jersey-media-json-jackson。我一直对使用 MOXy 的 Maps 有疑问。我猜他们玩得不好。似乎您需要使用适配器才能使其发挥出色，如所见 here from Blaise Doughan .
也就是说，我要求(在上面的评论中)查看您的服务器端配置，因为 MOXy 会自动配置自己，并优先于 jersey-media-json-jackson。为什么，我不确定，这正是我一直经历的。所以我很好奇服务器端是如何在响应返回到客户端之前没有失败的。除非您将 JacksonFeature 配置到服务器应用程序中，否则您还应该在客户端中配置它。 (这只是情况，因为你也有 MOXy 依赖)。
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 jersey-media-moxy 依赖项。 jersey-media-json-jackson 也会自动配置它的特性。您应该只使用其中之一。
顺便说一句:
@Path("/getAllNews")。路径段应该是名词，除非它们是 Controller 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 方法已经包含应执行每个 CRUD 操作的动词。
只需要考虑一些语义:-)
更新
问题出在 New 键上。 jackson 不知道如何反序列化这个。由于您愿意切换键和值类型，只需更改 toString 返回 Term 类中的 name，它应该是好的。
关于java - Jersey 错误 : MessageBodyReader not found for media type=application/json，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/27090833/
大约一年前，我决定确保每个包含非唯一文本的Flash通知都将从模块中的方法中获取文本。我这样做的最初原因是为了避免一遍又一遍地输入相同的字符串。如果我想更改措辞，我可以在一个地方轻松完成，而且一遍又一遍地重复同一件事而出现拼写错误的可能性也会降低。我最终得到的是这样的:moduleMessagesdefformat_error_messages(errors)errors.map{|attribute,message|"Error:#{attribute.to_s.titleize}#{message}."}enddeferror_message_could_not_find(obje
我在我的项目中添加了一个系统来重置用户密码并通过电子邮件将密码发送给他，以防他忘记密码。昨天它运行良好(当我实现它时)。当我今天尝试启动服务器时，出现以下错误。=>BootingWEBrick=>Rails3.2.1applicationstartingindevelopmentonhttp://0.0.0.0:3000=>Callwith-dtodetach=>Ctrl-CtoshutdownserverExiting/Users/vinayshenoy/.rvm/gems/ruby-1.9.3-p0/gems/actionmailer-3.2.1/lib/action_mailer
刚入门rails，开始慢慢理解。有人可以解释或给我一些关于在application_controller中编码的好处或时间和原因的想法吗？有哪些用例。您如何为Rails应用程序使用应用程序Controller？我不想在那里放太多代码，因为据我了解，每个请求都会调用此Controller。这是真的？ 最佳答案 ApplicationController实际上是您应用程序中的每个其他Controller都将从中继承的类(尽管这不是强制性的)。我同意不要用太多代码弄乱它并保持干净整洁的态度，尽管在某些情况下ApplicationContr
在我的Controller中，我通过以下方式在我的index方法中支持HTML和JSON:respond_todo|format|format.htmlformat.json{renderjson:@user}end在浏览器中拉起它时，它会自然地以HTML呈现。但是，当我对/user资源进行内容类型为application/json的curl调用时(因为它是索引方法)，我仍然将HTML作为响应。如何获取JSON作为响应？我还需要说明什么？ 最佳答案 您应该将.json附加到请求的url，提供的格式在routes.rb的路径中定义。这
我真的很习惯使用Ruby编写以下代码:my_hash={}my_hash['test']=1Java中对应的数据结构是什么？ 最佳答案 HashMapmap=newHashMap();map.put("test",1);我假设？ 关于java-等价于Java中的RubyHash，我们在StackOverflow上找到一个类似的问题： https://stackoverflow.com/questions/22737685/
我遵循MichaelHartl的“RubyonRails教程:学习Web开发”，并创建了检查用户名和电子邮件长度有效性的测试(名称最多50个字符，电子邮件最多255个字符)。test/helpers/application_helper_test.rb的内容是:require'test_helper'classApplicationHelperTest在运行bundleexecraketest时，所有测试都通过了，但我看到以下消息在最后被标记为错误:ERROR["test_full_title_helper",ApplicationHelperTest,1.820016791]test
我是rails的新手，想在form字段上应用验证。myviewsnew.html.erb.....模拟.rbclassSimulation{:in=>1..25,:message=>'Therowmustbebetween1and25'}end模拟Controller.rbclassSimulationsController我想检查模型类中row字段的整数范围，如果不在范围内则返回错误信息。我可以检查上面代码的范围，但无法返回错误消息提前致谢 最佳答案 关键是您使用的是模型表单，一种显示ActiveRecord模型实例属性的表单。c
我正在尝试编写一个将文件上传到AWS并公开该文件的Ruby脚本。我做了以下事情:s3=Aws::S3::Resource.new(credentials:Aws::Credentials.new(KEY,SECRET),region:'us-west-2')obj=s3.bucket('stg-db').object('key')obj.upload_file(filename)这似乎工作正常，除了该文件不是公开可用的，而且我无法获得它的公共(public)URL。但是当我登录到S3时，我可以正常查看我的文件。为了使其公开可用，我将最后一行更改为obj.upload_file(file
我克隆了一个rails仓库，我现在正尝试捆绑安装背景:OSXElCapitanruby2.2.3p173(2015-08-18修订版51636)[x86_64-darwin15]rails-v在您的Gemfile中列出的或native可用的任何gem源中找不到gem'pg(>=0)ruby'。运行bundleinstall以安装缺少的gem。bundleinstallFetchinggemmetadatafromhttps://rubygems.org/............Fetchingversionmetadatafromhttps://rubygems.org/...Fe
在Cooper的书BeginningRuby中，第166页有一个我无法重现的示例。classSongincludeComparableattr_accessor:lengthdef(other)@lengthother.lengthenddefinitialize(song_name,length)@song_name=song_name@length=lengthendenda=Song.new('Rockaroundtheclock',143)b=Song.new('BohemianRhapsody',544)c=Song.new('MinuteWaltz',60)a.betwee