在 Eclipse 中的 Tomcat 7 上运行 Jersey Web 应用程序时出现 404 错误-解网

问：

尝试使用 Jersey 创建一个简单的 RESTful Web 服务并将其部署在 Tomcat 7 上。由于我是 Java Web 应用程序开发的新手，并且渴望学习它，因此我将遵循本教程。

我在 Eclipse 中创建了这个应用程序作为 Maven 项目，并使用了带有 groupID 的工件版本。请注意，我稍后必须更改 Project Facet，否则它不会为我提供将其部署到本地 Tomcat 服务器的选项。jersey-quickstart-webapp2.22.2org.glassfish.jersey.archetypesDynamic Web Module

我已将我的应用程序添加为 Tomcat 服务器中的资源。当我在Eclipse中启动Tomcat服务器时，我没有看到任何错误。只有一个警告，根据许多 SO 帖子，可以安全地忽略它。messengerWARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:messenger' did not find a matching property.

右键单击应用程序并单击 -> 后，我看到未找到 URL 的 404 页面以及 .Run AsRun on Serverhttp://localhost:8080/messenger/http://localhost:8080/webapi/myresource

检查了很多类似的 SO 帖子，比如这个和这个，但它们没有帮助。

我注意到的一件事是内部与我的应用程序的 web.xml 不匹配（不确定它是否应该匹配，在应用程序部署到 Tomcat 后）。事实上，该目录下的内容复制如下：web.xml<peoject_root>/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/ROOT/WEB-INF

<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">

需要一些关于可能出问题的指示。这可能是一些简单的事情，但我花了很多时间挠头，第 n 次出现相同的 404 错误。我希望在我获得一些信心并继续观看培训视频之前，让这个简单的应用程序工作。

通过屏幕截图和文件内容添加更多细节：

MyResource.java

package org.testapp.java.messenger;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;

/**
 * Root resource (exposed at "myresource" path)
 */
@Path("myresource")
public class MyResource {

    /**
     * Method handling HTTP GET requests. The returned object will be sent
     * to the client as "text/plain" media type.
     *
     * @return String that will be returned as a text/plain response.
     */
    @GET
    @Produces(MediaType.TEXT_PLAIN)
    public String getIt() {
        return "Got it!";
    }
}

网络.xml

<?xml version="1.0" encoding="UTF-8"?>
<!-- This web.xml file is not required when using Servlet 3.0 container,
     see implementation details http://jersey.java.net/nonav/documentation/latest/jax-rs.html -->
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
    <servlet>
        <servlet-name>Jersey Web Application</servlet-name>
        <servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
        <init-param>
            <param-name>jersey.config.server.provider.packages</param-name>
            <param-value>org.testapp.java.messenger</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>Jersey Web Application</servlet-name>
        <url-pattern>/webapi/*</url-pattern>
    </servlet-mapping>
</web-app>

项目结构

Tomcat 错误

您在代码中看到的一个红叉实际上是教程视频中的讲师要求忽略的，因为 Tomcat 提供了 HTTPServlet 类。The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path

控制台输出

May 01, 2016 10:09:20 PM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:messenger' did not find a matching property.
May 01, 2016 10:09:20 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Server version:        Apache Tomcat/7.0.69
May 01, 2016 10:09:20 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Server built:          Apr 11 2016 07:57:09 UTC
May 01, 2016 10:09:20 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Server number:         7.0.69.0
May 01, 2016 10:09:20 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: OS Name:               Mac OS X
May 01, 2016 10:09:20 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: OS Version:            10.10.2
May 01, 2016 10:09:20 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Architecture:          x86_64
May 01, 2016 10:09:20 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Java Home:             /Library/Java/JavaVirtualMachines/jdk1.8.0_31.jdk/Contents/Home/jre
May 01, 2016 10:09:20 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: JVM Version:           1.8.0_31-b13
May 01, 2016 10:09:20 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: JVM Vendor:            Oracle Corporation
May 01, 2016 10:09:20 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: CATALINA_BASE:         /Users/abc/Personal/Java/.metadata/.plugins/org.eclipse.wst.server.core/tmp0
May 01, 2016 10:09:20 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: CATALINA_HOME:         /Users/abc/Personal/Java/apache-tomcat-7.0.69
May 01, 2016 10:09:20 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dcatalina.base=/Users/abc/Personal/Java/.metadata/.plugins/org.eclipse.wst.server.core/tmp0
May 01, 2016 10:09:20 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dcatalina.home=/Users/abc/Personal/Java/apache-tomcat-7.0.69
May 01, 2016 10:09:20 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dwtp.deploy=/Users/abc/Personal/Java/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps
May 01, 2016 10:09:20 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Djava.endorsed.dirs=/Users/abc/Personal/Java/apache-tomcat-7.0.69/endorsed
May 01, 2016 10:09:20 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dfile.encoding=UTF-8
May 01, 2016 10:09:20 PM org.apache.catalina.core.AprLifecycleListener lifecycleEvent
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: /Users/abc/Library/Java/Extensions:/Library/Java/Extensions:/Network/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java:.
May 01, 2016 10:09:20 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-bio-8080"]
May 01, 2016 10:09:20 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-bio-8009"]
May 01, 2016 10:09:20 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 434 ms
May 01, 2016 10:09:20 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
May 01, 2016 10:09:20 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/7.0.69
May 01, 2016 10:09:20 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-bio-8080"]
May 01, 2016 10:09:20 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-bio-8009"]
May 01, 2016 10:09:20 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 269 ms

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>org.testapp.java</groupId>
    <artifactId>messenger</artifactId>
    <packaging>war</packaging>
    <version>0.0.1-SNAPSHOT</version>
    <name>messenger</name>

    <build>
        <finalName>messenger</finalName>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.5.1</version>
                <inherited>true</inherited>
                <configuration>
                    <source>1.7</source>
                    <target>1.7</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.glassfish.jersey</groupId>
                <artifactId>jersey-bom</artifactId>
                <version>${jersey.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <dependency>
            <groupId>org.glassfish.jersey.containers</groupId>
            <artifactId>jersey-container-servlet-core</artifactId>
            <!-- use the following artifactId if you don't need servlet 2.x compatibility -->
            <!-- artifactId>jersey-container-servlet</artifactId -->
        </dependency>
        <!-- uncomment this to get JSON support
        <dependency>
            <groupId>org.glassfish.jersey.media</groupId>
            <artifactId>jersey-media-moxy</artifactId>
        </dependency>
        -->
    </dependencies>
    <properties>
        <jersey.version>2.22.2</jersey.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
</project>

Java Eclipse Rest Maven Tomcat

在 Eclipse 中的 Tomcat 7 上运行 Jersey Web 应用程序时出现 404 错误

404 error when running Jersey web app on Tomcat 7 in Eclipse

评论

评论

评论

评论