在 Jetty 上运行 Jersey Servlet - 错误：ResourceConfig 实例不包含任何根资源类

Question

当我尝试使用 mvn jetty:run 在 jetty 上运行 Jersey Servlet 时，我收到错误：

SCHWERWIEGEND: The ResourceConfig instance does not contain any root resource classes.
2011-07-15 20:03:05.736:WARN:/server:unavailable
com.sun.jersey.api.container.ContainerException: The ResourceConfig instance does not contain any root resource classes.

它一定是非常简单的东西，请帮助我。我觉得我注定无法开发一个简单的 JAX-RS HelloWorld！

当我打开 http://localhost:8080/server/ （服务器是项目名称）时，我回来了“你好世界！”当我只应该重新打开 http://localhost:8080/rest/test/ 时应该说“你好”。即使我在项目文件夹上执行 mvn jetty:run，这是否是我的 jetty 中的旧 servlet？

文件夹结构

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app 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">

    <servlet>
        <servlet-name>Jersey Web Application</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>com.e.api</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>Jersey Web Application</servlet-name>
        <url-pattern>/rest/*</url-pattern>
    </servlet-mapping>
</web-app>

HelloWorldResource.java

package com.e.api;

import javax.ws.rs.GET;
import javax.ws.rs.ProduceMime;
import javax.ws.rs.Path;

@Path("/test")
public class HelloWorldResource {

 @GET
 @Produces("text/html") //Modified after comment from @ProduceMime
 public String getMessage( ) {
  return "hello";
 }
}

pom.xml

<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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.e.api</groupId>
    <artifactId>server</artifactId>
    <packaging>war</packaging>
    <version>0.0.1-SNAPSHOT</version>
    <name>server Maven Webapp</name>
    <url>http://maven.apache.org</url>
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.sun.jersey</groupId>
            <artifactId>jersey-server</artifactId>
            <version>1.8</version>
        </dependency>
        <dependency>
          <groupId>org.jsoup</groupId>
          <artifactId>jsoup</artifactId>
          <version>1.5.2</version>
        </dependency>
            <dependency>
                <groupId>log4j</groupId>
                <artifactId>log4j</artifactId>
                <version>1.2.6</version>
                <type>jar</type>
                <scope>compile</scope>
            </dependency>
    </dependencies>
    <build>
        <finalName>server</finalName>
        <plugins>
            <plugin>
                <groupId>org.mortbay.jetty</groupId>
                <artifactId>maven-jetty-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
    <repositories>
        <repository>
            <id>maven2-repository.java.net</id>
            <name>Java.net Repository for Maven</name>
            <url>http://download.java.net/maven/2/</url>
            <layout>default</layout>
        </repository>
        <repository>
            <id>maven-repository.java.net</id>
            <name>Java.net Maven 1 Repository (legacy)</name>
            <url>http://download.java.net/maven/1</url>
            <layout>legacy</layout>
        </repository>
    </repositories>
</project>

mvn jetty:build -e

PS C:\Users\Dom\work\server> mvn jetty:run -e
+ Error stacktraces are turned on.
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Building server Maven Webapp
[INFO]    task-segment: [jetty:run]
[INFO] ------------------------------------------------------------------------
[INFO] Preparing jetty:run
[INFO] [resources:resources {execution: default-resources}]
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] Copying 10 resources
[INFO] [compiler:compile {execution: default-compile}]
[INFO] No sources to compile
[INFO] [resources:testResources {execution: default-testResources}]
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources, i.e. build is platform dependent!
[INFO] skip non existing resourceDirectory C:\Users\Dom\work\server\src\test\resources
[INFO] [compiler:testCompile {execution: default-testCompile}]
[INFO] No sources to compile
[INFO] [jetty:run {execution: default-cli}]
[INFO] Configuring Jetty for project: server Maven Webapp
[INFO] Webapp source directory = C:\Users\Dom\work\server\src\main\webapp
[INFO] Reload Mechanic: automatic
[INFO] Classes = C:\Users\Dom\work\server\target\classes
2011-07-15 23:17:11.868:INFO::Logging to STDERR via org.mortbay.log.StdErrLog
[INFO] Context path = /server
[INFO] Tmp directory =  determined at runtime
[INFO] Web defaults = org/mortbay/jetty/webapp/webdefault.xml
[INFO] Web overrides =  none
[INFO] web.xml file = C:\Users\Dom\work\server\src\main\webapp\WEB-INF\web.xml
[INFO] Webapp directory = C:\Users\Dom\work\server\src\main\webapp
[INFO] Starting jetty 6.1.26 ...
2011-07-15 23:17:11.937:INFO::jetty-6.1.26
2011-07-15 23:17:12.026:INFO::No Transaction manager found - if your webapp requires one, please configure one.
15.07.2011 23:17:12 com.sun.jersey.api.core.PackagesResourceConfig init
INFO: Scanning for root resource and provider classes in the packages:
  com.e.api
15.07.2011 23:17:12 com.sun.jersey.server.impl.application.WebApplicationImpl _initiate
INFO: Initiating Jersey application, version 'Jersey: 1.8 06/24/2011 12:17 PM'
15.07.2011 23:17:12 com.sun.jersey.server.impl.application.RootResourceUriRules <init>
SCHWERWIEGEND: The ResourceConfig instance does not contain any root resource classes.
2011-07-15 23:17:12.806:WARN:/server:unavailable
com.sun.jersey.api.container.ContainerException: The ResourceConfig instance does not contain any root resource classes.

        at com.sun.jersey.server.impl.application.RootResourceUriRules.<init>(RootResourceUriRules.java:99)
        at com.sun.jersey.server.impl.application.WebApplicationImpl._initiate(WebApplicationImpl.java:1298)
        at com.sun.jersey.server.impl.application.WebApplicationImpl.access$700(WebApplicationImpl.java:169)
        at com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:775)
        at com.sun.jersey.server.impl.application.WebApplicationImpl$13.f(WebApplicationImpl.java:771)
        at com.sun.jersey.spi.inject.Errors.processWithErrors(Errors.java:193)
        at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:771)
        at com.sun.jersey.server.impl.application.WebApplicationImpl.initiate(WebApplicationImpl.java:766)
        at com.sun.jersey.spi.container.servlet.ServletContainer.initiate(ServletContainer.java:488)
        at com.sun.jersey.spi.container.servlet.ServletContainer$InternalWebComponent.initiate(ServletContainer.java:318
)
        at com.sun.jersey.spi.container.servlet.WebComponent.load(WebComponent.java:609)
        at com.sun.jersey.spi.container.servlet.WebComponent.init(WebComponent.java:210)
        at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:373)
        at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:556)
        at javax.servlet.GenericServlet.init(GenericServlet.java:241)
        at org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:440)
        at org.mortbay.jetty.servlet.ServletHolder.doStart(ServletHolder.java:263)
        at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
        at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:736)
        at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)
        at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1282)
        at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:518)
        at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:499)
        at org.mortbay.jetty.plugin.Jetty6PluginWebAppContext.doStart(Jetty6PluginWebAppContext.java:115)
        at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
        at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152)
        at org.mortbay.jetty.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:156)
        at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
        at org.mortbay.jetty.handler.HandlerCollection.doStart(HandlerCollection.java:152)
        at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
        at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
        at org.mortbay.jetty.Server.doStart(Server.java:224)
        at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
        at org.mortbay.jetty.plugin.Jetty6PluginServer.start(Jetty6PluginServer.java:132)
        at org.mortbay.jetty.plugin.AbstractJettyMojo.startJetty(AbstractJettyMojo.java:454)
        at org.mortbay.jetty.plugin.AbstractJettyMojo.execute(AbstractJettyMojo.java:396)
        at org.mortbay.jetty.plugin.AbstractJettyRunMojo.execute(AbstractJettyRunMojo.java:210)
        at org.mortbay.jetty.plugin.Jetty6RunMojo.execute(Jetty6RunMojo.java:184)
        at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:490)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:694)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandaloneGoal(DefaultLifecycleExecutor.java:569)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(DefaultLifecycleExecutor.java:539)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.jav
a:387)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:348)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:180)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:328)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:138)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:362)
        at org.apache.maven.cli.compat.CompatibleMain.main(CompatibleMain.java:60)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
        at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
        at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
        at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
2011-07-15 23:17:12.877:INFO::Started [email protected]:8080
[INFO] Started Jetty Server

Answer 1

编辑：经过一番讨论，我们得出的结论是java源文件位于错误的位置并且没有被编译。