不知道为什么：ResourceConfig实例不包含任何根资源类 [英] No Idea why : The ResourceConfig instance does not contain any root resource classes
问题描述
我是球衣和网络服务的新手，我尝试运行一个简单的RESTful Web服务。我跟着 http://www.mkyong.com/webservices / jax-rs / jersey-hello-world-example / 但我的项目不使用maven，我下载了jersey.1.17.1.jar并将其包含在我的项目路径中。
I'm new to jersey and web services and I'm try to run a simple RESTful web service. I followed http://www.mkyong.com/webservices/jax-rs/jersey-hello-world-example/ but my project doesn't use maven and I download the jersey.1.17.1.jar and include it to my project path.
当我想在 http：// localhost：8080 / sycotext / rest / service / SOMETEXT 上调用服务时出现此错误：
When I want to call the service on http://localhost:8080/sycotext/rest/service/SOMETEXT I get this error :
HTTP Status 500 - Servlet.init() for servlet sycoText-servlet threw exception
这是堆栈跟踪：
javax.servlet.ServletException: Servlet.init() for servlet sycoText-servlet threw exception
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:504)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:76)
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:934)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:515)
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1010)
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:640)
org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:223)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1618)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1576)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
java.lang.Thread.run(Thread.java:724)
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:1331)
com.sun.jersey.server.impl.application.WebApplicationImpl.access$700(WebApplicationImpl.java:168)
com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:774)
com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:770)
com.sun.jersey.spi.inject.Errors.processWithErrors(Errors.java:193)
com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:770)
com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:765)
com.sun.jersey.spi.container.servlet.ServletContainer.initiate(ServletContainer.java:489)
com.sun.jersey.spi.container.servlet.ServletContainer$InternalWebComponent.initiate(ServletContainer.java:319)
com.sun.jersey.spi.container.servlet.WebComponent.load(WebComponent.java:605)
com.sun.jersey.spi.container.servlet.WebComponent.init(WebComponent.java:210)
com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:374)
com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:557)
javax.servlet.GenericServlet.init(GenericServlet.java:160)
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:504)
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:76)
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:934)
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:515)
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1010)
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:640)
org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:223)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1618)
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1576)
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
java.lang.Thread.run(Thread.java:724)
这是我的代码：
package ir.sycotech.text.server.service;
import javax.ws.rs.*;
import javax.ws.rs.core.Response;
@Path("/service")
public class SycoTextService {
@GET
@Path("/{param}")
public Response getMsg(@PathParam("param") String msg) {
String output = "Jersey say : " + msg;
return Response.status(200).entity(output).build();
}
这是我的web.xml：
and here is my web.xml :
<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4"
xmlns="http://java.sun.com/xml/ns/j2ee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<display-name>Restful Web Application</display-name>
<servlet>
<servlet-name>sycoText-servlet</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>ir.sycotech.text.server.service</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>sycoText-servlet</servlet-name>
<url-pattern>/rest/*</url-pattern>
</servlet-mapping>
</web-app>
我已经在web.xml文件中正确指定了我的包名，我不知道为什么会这样这个错误，如果有人知道是什么问题，我将非常感激
I have specified my packagename correctly in the web.xml file and I don't know why I got this error, I will be really appreciate if anyone knows what is the problem
推荐答案
错误：
com.sun.jersey.api.container.ContainerException：ResourceConfig实例不包含任何根资源类。
com.sun.jersey.api.container.ContainerException: The ResourceConfig instance does not contain any root resource classes.
表示Jersey无法找到服务类。这可能是由 com.sun.jersey.config.property.packages 参数的错误命名包引起的，或者包名是否正确但是它不包含资源类（人们有时会忘记在课堂上添加 @Path 注释。）
means that Jersey can't find service classes. That can be caused by a wrongly named package for the com.sun.jersey.config.property.packages parameter or if the package name is correct but it does not contain resource classes (people sometimes forget to add the @Path annotation on the class).
但我找不到任何东西你的设置有误。所以这应该可行！
But I can't find anything wrong with your setup. So this should work!
检查您的应用程序是否正确部署，以及 WEB-INF / classes 文件夹实际包含您的类具有适当的文件夹路径。
Check that your application deployed correctly and that your WEB-INF/classes folder actually contains your class with the proper folder path for the package.
执行完全清理并重建然后重试。
Do a full clean and rebuild then try again.
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