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发布于 2024-12-01 17:13:35 字数 5421 浏览 1 评论 0原文

我正在使用 Jersey 1.8，我提到的教程已经很旧了。什么都不起作用。我指的是此处给出的教程

并获得类未找到异常。根据教程，我制作了 Java 类并配置了 web.xml。它向我展示了一个异常，但我没有办法解决这个问题。我想要一个关于 Jersey 实施的完整的最新教程。如果有什么比 Jersey 更好的 REST 实现，请提出建议。我最近开始使用基于 REST 的 Web 服务，如果您能建议我从哪里开始（我只对 REST 感兴趣），我将不胜感激。下面是我使用 eclipse 编写和编译的代码。

Hello.java

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
@Path("/hello")
public class Hello {

    //This method prints the Plain Text
    @GET
    @Produces(MediaType.TEXT_PLAIN)
    public String sayPlainTextHello()
    {
        return "Hello Jersey";
    }

    //This is the XML request output

    @GET
    @Produces(MediaType.TEXT_XML)
    public String sayXMLHello()
    {
        return "<?xml version=\"1.0\"?>" + "<hello> Hello Jersey" + "</hello>";
    }

    //This result is produced if HTML is requested

    @GET
    @Produces(MediaType.TEXT_HTML)
    public String sayHTMLHello()
    {
        return "<html> " + "<title>" + "Hello Jersey" + "</title>"
        + "<body><h1>" + "Hello Jersey" + "</body></h1>" + "</html> ";
    }

}

web.xml 如下

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>RESTFullApp</display-name>
  <servlet>
  <servlet-name>JerseyRESTService</servlet-name>
  <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer;</servlet-class>
  <init-param>
  <param-name>com.sun.jersey.config.property.packages</param-name>
  <param-value>RESTFullApp</param-value>
  </init-param>
  <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
  <servlet-name>JerseyRESTService</servlet-name>
  <url-pattern>/rest/*</url-pattern>
  </servlet-mapping>
<!--  <welcome-file-list>-->
<!--    <welcome-file>index.html</welcome-file>-->
<!--    <welcome-file>index.htm</welcome-file>-->
<!--    <welcome-file>index.jsp</welcome-file>-->
<!--    <welcome-file>default.html</welcome-file>-->
<!--    <welcome-file>default.htm</welcome-file>-->
<!--    <welcome-file>default.jsp</welcome-file>-->
<!--  </welcome-file-list>-->
</web-app>

Noe 我尝试运行时遇到的错误是

exception 

javax.servlet.ServletException: Servlet.init() for servlet JerseyRESTService threw exception
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
    org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
    org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
    org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
    java.lang.Thread.run(Unknown Source)


root cause 

com.sun.jersey.api.container.ContainerException: The ResourceConfig instance does not contain any root resource classes.
    com.sun.jersey.server.impl.application.RootResourceUriRules.<init>(RootResourceUriRules.java:99)
    com.sun.jersey.server.impl.application.WebApplicationImpl._initiate(WebApplicationImpl.java:1298)
    com.sun.jersey.server.impl.application.WebApplicationImpl.access$700(WebApplicationImpl.java:169)
    com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:775)
    com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:771)
    com.sun.jersey.spi.inject.Errors.processWithErrors(Errors.java:193)
    com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:771)
    com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:766)
    com.sun.jersey.spi.container.servlet.ServletContainer.initiate(ServletContainer.java:488)
    com.sun.jersey.spi.container.servlet.ServletContainer$InternalWebComponent.initiate(ServletContainer.java:318)
    com.sun.jersey.spi.container.servlet.WebComponent.load(WebComponent.java:609)
    com.sun.jersey.spi.container.servlet.WebComponent.init(WebComponent.java:210)
    com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:373)
    com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:556)
    javax.servlet.GenericServlet.init(GenericServlet.java:212)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
    org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
    org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
    org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
    java.lang.Thread.run(Unknown Source)
原文

I am using Jersey 1.8 and the tutorials that I am referring are quiet old. Nothing works. I am referring to the tutorial given here

And get a class not found exception. as per the tutorial I made my Java Class as well as configured my web.xml. It shows me an exception and I am not getting a way to fix this. I would like to have a complete up to date tutorial for Jersey implementation. And if something is better than Jersey for REST implementation please suggest. I have rescently started with REST based web services and would appreciate if you can suggest me where to start from(I am only interested in REST). Below is the code that I wrote and compiled using eclipse.

Hello.java

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
@Path("/hello")
public class Hello {

    //This method prints the Plain Text
    @GET
    @Produces(MediaType.TEXT_PLAIN)
    public String sayPlainTextHello()
    {
        return "Hello Jersey";
    }

    //This is the XML request output

    @GET
    @Produces(MediaType.TEXT_XML)
    public String sayXMLHello()
    {
        return "<?xml version=\"1.0\"?>" + "<hello> Hello Jersey" + "</hello>";
    }

    //This result is produced if HTML is requested

    @GET
    @Produces(MediaType.TEXT_HTML)
    public String sayHTMLHello()
    {
        return "<html> " + "<title>" + "Hello Jersey" + "</title>"
        + "<body><h1>" + "Hello Jersey" + "</body></h1>" + "</html> ";
    }

}

web.xml is as follows

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>RESTFullApp</display-name>
  <servlet>
  <servlet-name>JerseyRESTService</servlet-name>
  <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer;</servlet-class>
  <init-param>
  <param-name>com.sun.jersey.config.property.packages</param-name>
  <param-value>RESTFullApp</param-value>
  </init-param>
  <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
  <servlet-name>JerseyRESTService</servlet-name>
  <url-pattern>/rest/*</url-pattern>
  </servlet-mapping>
<!--  <welcome-file-list>-->
<!--    <welcome-file>index.html</welcome-file>-->
<!--    <welcome-file>index.htm</welcome-file>-->
<!--    <welcome-file>index.jsp</welcome-file>-->
<!--    <welcome-file>default.html</welcome-file>-->
<!--    <welcome-file>default.htm</welcome-file>-->
<!--    <welcome-file>default.jsp</welcome-file>-->
<!--  </welcome-file-list>-->
</web-app>

Noe the error I get while I try to run is

exception 

javax.servlet.ServletException: Servlet.init() for servlet JerseyRESTService threw exception
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
    org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
    org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
    org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
    java.lang.Thread.run(Unknown Source)


root cause 

com.sun.jersey.api.container.ContainerException: The ResourceConfig instance does not contain any root resource classes.
    com.sun.jersey.server.impl.application.RootResourceUriRules.<init>(RootResourceUriRules.java:99)
    com.sun.jersey.server.impl.application.WebApplicationImpl._initiate(WebApplicationImpl.java:1298)
    com.sun.jersey.server.impl.application.WebApplicationImpl.access$700(WebApplicationImpl.java:169)
    com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:775)
    com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:771)
    com.sun.jersey.spi.inject.Errors.processWithErrors(Errors.java:193)
    com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:771)
    com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:766)
    com.sun.jersey.spi.container.servlet.ServletContainer.initiate(ServletContainer.java:488)
    com.sun.jersey.spi.container.servlet.ServletContainer$InternalWebComponent.initiate(ServletContainer.java:318)
    com.sun.jersey.spi.container.servlet.WebComponent.load(WebComponent.java:609)
    com.sun.jersey.spi.container.servlet.WebComponent.init(WebComponent.java:210)
    com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:373)
    com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:556)
    javax.servlet.GenericServlet.init(GenericServlet.java:212)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
    org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:857)
    org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588)
    org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
    java.lang.Thread.run(Unknown Source)

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评论（2）

温柔戏命师 2024-12-08 17:13:35

您没有完全按照教程进行操作。你在这里或那里改变了一些位，但没有真正理解它们代表什么。在这种特殊情况下，根据例外情况，

com.sun.jersey.api.container.ContainerException：ResourceConfig 实例不包含任何根资源类。

以下初始化参数是错误的

<init-param>
   <param-name>com.sun.jersey.config.property.packages</param-name>
   <param-value>RESTFullApp</param-value>
</init-param>

它应该引用包含服务的包。将您的服务放入包中并在 init 参数值中指定。无论是否是 Jersey，使用默认包始终是一种不好的做法。

至于教程，为什么不直接阅读 Jersey 自己的文档呢？ Jersey Wiki 和 Jersey 用户指南。

You're not exactly following the tutorial. You changed bits here and there without actually understanding what they represents. In this particular case, according to the exception,

com.sun.jersey.api.container.ContainerException: The ResourceConfig instance does not contain any root resource classes.

the following init param is wrong

<init-param>
   <param-name>com.sun.jersey.config.property.packages</param-name>
   <param-value>RESTFullApp</param-value>
</init-param>

It should refer to the package containing the services. Put your service in a package and specify that in the init param value. Jersey or not, using the default package is always a bad practice.

As to the tutorials, why don't you just read Jersey's own documentation? Jersey Wiki and Jersey User Guide.

回复 原文
黑色毁心梦 2024-12-08 17:13:35

请尝试Jersey 用户指南。它几乎总是有最新的教程。至于错误，您的 web.xml 声明您的资源类将位于名为“RESTFullApp”的包中。 1）这是一个特殊的包名称，2）我在你的类上没有看到包声明。

编辑：对于一个工作示例，您可以查看我的github上的示例项目。如果你有 git 和 maven，你可以克隆它并运行它

git clone git://github.com/zzantozz/testbed.git tmp
cd tmp
mvn jetty:run -pl basic-jersey

然后访问 http://localhost:8080/basic-jersey /休息/测试

Try the Jersey User Guide. It will pretty much always have the most up-to-date tutorial. As for the error, your web.xml declares that your resources classes will be in a package called "RESTFullApp". 1) That's a peculiar package name, and 2) I don't see a package declaration on your class.

Edit: For a working example, you check out my sample project on github. If you have git and maven, you can clone it and run it with

git clone git://github.com/zzantozz/testbed.git tmp
cd tmp
mvn jetty:run -pl basic-jersey

Then visit http://localhost:8080/basic-jersey/rest/test

回复 原文
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