当将jersey与jackson库集成时，Provider，Feature，ObjectMapper，ContextResolver之间的关系是什么？

Question

我正在研究球衣框架。我对这篇文章很困惑，第一节是json - ＆gt;杰克逊。 https://jersey.java.net/documentation/latest/media.html

我不知道他为什么扩展ObjectMapper并注册这个MyObjectMapper，为什么不直接注册提供者呢？ ObjectMapper和提供者之间的关系是什么？

我试着直接注册一个jackson提供程序，但是当我运行启动应用程序时，我得到＆＃34;堆栈溢出错误＆＃34;，因为我得到无限循环。

public class App {
private static URI BASE_URI = URI.create("http://localhost:8080/");

public static void main( String[] args ) {
    System.out.println( "Hello World!" );

    try {
        final HttpServer server = GrizzlyHttpServerFactory.createHttpServer(BASE_URI, new MyBlogApplication(), false);
        server.start();
    } catch (IOException ie) {
        Logger.getLogger(App.class.getName()).log(Level.SEVERE, null, ie);
    }
}}


class MyBlogApplication extends ResourceConfig {
    public MyBlogApplication() {
         packages("org.xiongbingchao.resources;org.xiongbingchao.service");
        register(JacksonJsonProvider.class);
    }
}

我的宁静资源：

@Path("/articles")
public class ArticlesResource {
    @GET
    @Produces("application/json")
    public Vector<Article> getArticleList() {
       return new Vector<Article>();
    }

    @GET
    @Path("/{articleId}")
    @Produces("application/json")
    public Article getArticle(@PathParam("articleId") int articleId) {
        return new Article();
    }
}

当我访问localhost时：8080 / articles / 3

错误堆栈： 注意：顶部内容有很多重复，所以我隐藏它们

at org.glassfish.jersey.server.internal.MappableExceptionWrapperInterceptor.aroundWriteTo(MappableExceptionWrapperInterceptor.java:92)
at org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:162)
at org.glassfish.jersey.message.internal.MessageBodyFactory.writeTo(MessageBodyFactory.java:1130)
at org.glassfish.jersey.server.ServerRuntime$Responder.writeResponse(ServerRuntime.java:711)
at org.glassfish.jersey.server.ServerRuntime$Responder.processResponse(ServerRuntime.java:444)
at org.glassfish.jersey.server.ServerRuntime$Responder.process(ServerRuntime.java:434)
at org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:329)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271)
at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267)
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:267)
at org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317)
at org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:305)
at org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1154)
at org.glassfish.jersey.grizzly2.httpserver.GrizzlyHttpContainer.service(GrizzlyHttpContainer.java:384)
at org.glassfish.grizzly.http.server.HttpHandler$1.run(HttpHandler.java:224)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:591)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:571)
at java.lang.Thread.run(Thread.java:745)
Caused by: com.fasterxml.jackson.databind.JsonMappingException: Infinite recursion (StackOverflowError) (through reference chain: org.xiongbingchao.dao.Article
at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:693)
at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:690)
at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155)
at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:693)
at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:690)
at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155)
at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:693)
at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:690)
at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155)
at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:693)
at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:690)
Caused by: java.lang.StackOverflowError
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:760)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:709)
... 1011 more

在浏览器中，我获得了许多重复记录：

{"article_id":0,"user_id":0,"content":"","created_at":"","updated_at":"","articleById":{"article_id":0,"user_id":0,"content":"","created_at":"","updated_at":"","articleById":{"article_id":0,"user_id":0,"content":"","created_at":"","updated_at":"","articleById":{"article_id":0,"user_id":0,"content":"","created_at":"","updated_at":"","articleById":{"article_id":0,"user_id":0,"content":"","created_at":"","updated_at":"","articleById":{"article_id":0,"user_id":0,"content":"","created_at":"","updated_at":"","articleById":{"article_id":0,"user_id":0,"content":"","created_at":"","updated_at":"","articleById":{"article_id":0,"user_id":0,"content":"","created_at":"","updated_at":"","articleById":{"article_id":0,"user_id":0,"content":"","created_at":"","updated_at":"","articleById":{"article_id":0,"user_id":0,"content":"","created_at":"","updated_at":"","articleById":{"article_id":0,"user_id":0,"content":"","created_at":"","updated_at":"","articleById":{"article_id":0,"user_id":0,"content":"","created_at":"","updated_at":"","articleById":{"article_id":0,"user_id":0,"content":"","created_at":"","updated_at":"","articleById":{"article_id":0,"user_id":0,"content":"","created_at":"","updated_at":"","articleById":{"article_id":0,"user_id":0,"content":"","created_at":"","updated_at":"","articleById":{"article_id":0,"user_id":0,"content":"","created_at":"","updated_at":"","articleById":{"article_id":0,"user_id":0,"content":"","created_at":"","updated_at":"","articleById":{"article_id":0,"user_id":0,"content":"","created_at":"","updated_at":"","articleById":{"article_id":0,"user_id":0,"content":"","created_at":"","updated_at":"","articleById":{"article_id":0,"user_id":0,"content":"","created_at":"","updated_at":"","articleById":{"article_id":0,"user_id":0,"content":"","created_at":"","updated_at":"","articleById":{"article_id":0,"user_id":0,"content":"","created_at":"","updated_at":"","articleById":{"article_id":0,"user_id":0,"content":"","created_at":"","updated_at":"","articleById":{"article_id":0,"user_id":0,"content":"","created_at":"","updated_at":"","articleById":{"article_id":0,"user_id":0,"content":"","created_at":"","updated_at":"","articleById":{"article_id":0,"user_id":0,"content":"","created_at":"","updated_at":"","articleById":{"article_id":0,"user_id":0,"content":"","created_at":"","updated_at":"","articleById":{"article_id":0,"user_id":0,"content":"","created_at":"","updated_at":"","articleById":{"article_id":0,"user_id":0,"content":"","created_at":"","updated_at":"","articleById":

2016年8月1日

添加我的代码：

public class Article {
public int article_id;
public int user_id;
public String content;
public String created_at;
public String updated_at;

public Article () {
    this.article_id = 0;
    this.user_id = 0;
    this.content = "";
    this.created_at = "";
    this.updated_at = "";
}

public Article getArticleById() {
    return new Article();
}

public Vector<Article> getArticleList(Vector<Integer> articleIds) {
    return new Vector<Article>();
}
}