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Java中的GAE Restful Web服务

[英]GAE Restful Web Service in Java

 原文  2014-04-09 16:26:44  7   2    java/ web-services/ google-app-engine/ rest

问题描述

我想在Java中为Google App Engine开发宁静的Web服务。 我正在使用的工具是 

Eclipse Kepler Service Release 2 (Build id: 20140224-0627)
Google AppEngine Java SDK 1.9.2

我使用了许多版本的Jersey，例如1.8、1.5等。如果我在本地服务器上运行该项目，效果很好，但是当我将其部署到google app引擎上时，我可以打开欢迎网页，但无法访问网络服务。

如https://code.google.com/p/googleappengine/wiki/WillItPlayInJava链接中所述，GAE支持Jersey 1.5，但是当我在项目中导入这些jar文件时，我无法将其部署在GAE上。

我不知道应该将哪个版本的Jersey与我的Google AppEngine Java SDK 1.9.2一起使用，还是应该使用另一个版本的SDK。

我的web.xml文件 

<?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" version="2.5">

    <display-name>com.cit.cittracker</display-name>
    <servlet>
        <servlet-name>Sample Web Service</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.cit.cittracker</param-value>
        </init-param>
        <init-param> 
            <param-name>com.sun.jersey.config.feature.DisableWADL</param-name> 
            <param-value>true</param-value> 
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>Sample Web Service</servlet-name>
        <url-pattern>/restservices/*</url-pattern>
    </servlet-mapping>

    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
    </welcome-file-list>
</web-app>

我的网络服务课程 

package com.aakib.sample;

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

@Path("/hello")
public class SampleHello {

    /*This method is called if TEXT_PLAIN is requested*/
    @GET
    @Produces(MediaType.TEXT_PLAIN)
    public String sayPlainTextHello() {
        return "Hello Jersey" + "(In Text Format)";
    }

    /*This method is called if XML is requested*/
    @GET  
    @Produces(MediaType.TEXT_XML)
    public String sayXMLHello() {
        return "<?xml version=\"1.0\"?>" + "<hello>Hello Jersey</hello>"
                                            + "<format>XML</format>";  
    }

    /*This method is called if HTML is requested*/
    @GET
    @Produces(MediaType.TEXT_HTML)
    public String sayHtmlHello() {
        return "<html> " + "<title>" + "Hello Jersey" + "</title>"
            + "<body><h1>" + "Hello Jersey" + "</h1><h2>In HTML Format<h2></body>" + "</html> ";
    }

    /*This method is called if HTML is requested and have two parameters*/
    @GET
    @Path("{name}")
    @Produces(MediaType.TEXT_HTML)
    public String sayHtmlHelloWith1Param(@PathParam("name") String vName) {
        return "<html> " + "<title>" + "Hello Jersey" + "</title>"
            + "<body><h1>Hello " + vName + "</h1><h2>In HTML Format</h2>" + 
                "<h3>1 Value Passed</h3>" + "</body>" + "</html> ";
    }

    /*This method is called if HTML is requested and have two parameters*/
    @GET
    @Path("{name}/{surname}")
    @Produces(MediaType.TEXT_HTML)
    public String sayHtmlHelloWith2Param(@PathParam("name") String vName, @PathParam("surname") String vSurname) {
        return "<html> " + "<title>" + "Hello Jersey" + "</title>"
                + "<body><h1>Hello " + vName + " " + vSurname + "</h1><h2>In HTML Format</h2>" + 
                    "<h3>2 Value Passed</h3>" + "</body>" + "</html> ";
    }
}

当我尝试使用Jersey 2.5和Jersey 1.17时，在本地服务器上收到错误 

Apr 12, 2014 2:10:45 AM java.util.prefs.WindowsPreferences <init>
WARNING: Could not open/create prefs root node Software\JavaSoft\Prefs at root 0x80000002. Windows RegCreateKeyEx(...) returned error code 5.
Apr 12, 2014 2:10:47 AM com.google.apphosting.utils.config.AppEngineWebXmlReader readAppEngineWebXml
INFO: Successfully processed B:\Programming\Java EE\CIT Tracker Web Service\war\WEB-INF/appengine-web.xml
Apr 12, 2014 2:10:47 AM com.google.apphosting.utils.config.AbstractConfigXmlReader readConfigXml
INFO: Successfully processed B:\Programming\Java EE\CIT Tracker Web Service\war\WEB-INF/web.xml
Apr 12, 2014 2:10:47 AM com.google.appengine.tools.development.SystemPropertiesManager setSystemProperties
INFO: Overwriting system property key 'java.util.logging.config.file', value 'C:\Program Files (x86)\Google AppEngine Java SDK 1.9.2\config\sdk\logging.properties' with value 'WEB-INF/logging.properties' from 'B:\Programming\Java EE\CIT Tracker Web Service\war\WEB-INF\appengine-web.xml'
Apr 12, 2014 2:10:47 AM com.google.apphosting.utils.jetty.JettyLogger info
INFO: Logging to JettyLogger(null) via com.google.apphosting.utils.jetty.JettyLogger
Apr 12, 2014 2:10:47 AM com.google.apphosting.utils.jetty.JettyLogger info
INFO: jetty-6.1.x
Apr 12, 2014 2:10:48 AM com.sun.jersey.api.core.PackagesResourceConfig init
INFO: Scanning for root resource and provider classes in the packages:
  com.cit.cittracker
Apr 12, 2014 2:10:48 AM com.google.apphosting.utils.jetty.JettyLogger warn
WARNING: failed CIT Tracker WebService: java.lang.IncompatibleClassChangeError: Implementing class
Apr 12, 2014 2:10:48 AM com.google.apphosting.utils.jetty.JettyLogger warn
WARNING: failed com.google.appengine.tools.development.DevAppEngineWebAppContext@7adb5354{/,B:\Programming\Java EE\CIT Tracker Web Service\war}: java.lang.IncompatibleClassChangeError: Implementing class
Apr 12, 2014 2:10:48 AM com.google.apphosting.utils.jetty.JettyLogger warn
WARNING: failed JettyContainerService$ApiProxyHandler@4c73cedb: java.lang.IncompatibleClassChangeError: Implementing class
Apr 12, 2014 2:10:48 AM com.google.apphosting.utils.jetty.JettyLogger warn
WARNING: Error starting handlers
java.lang.IncompatibleClassChangeError: Implementing class
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(Unknown Source)
    at java.security.SecureClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.defineClass(Unknown Source)
    at java.net.URLClassLoader.access$100(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.net.URLClassLoader$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:216)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at com.sun.jersey.api.core.ScanningResourceConfig.init(ScanningResourceConfig.java:79)
    at com.sun.jersey.api.core.PackagesResourceConfig.init(PackagesResourceConfig.java:104)
    at com.sun.jersey.api.core.PackagesResourceConfig.<init>(PackagesResourceConfig.java:78)
    at com.sun.jersey.api.core.PackagesResourceConfig.<init>(PackagesResourceConfig.java:89)
    at com.sun.jersey.spi.container.servlet.WebComponent.createResourceConfig(WebComponent.java:696)
    at com.sun.jersey.spi.container.servlet.WebComponent.createResourceConfig(WebComponent.java:674)
    at com.sun.jersey.spi.container.servlet.WebComponent.init(WebComponent.java:203)
    at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:374)
    at com.sun.jersey.spi.container.servlet.ServletContainer.init(ServletContainer.java:557)
    at javax.servlet.GenericServlet.init(GenericServlet.java:212)
    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:685)
    at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)
    at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1250)
    at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:517)
    at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:467)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
    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 com.google.appengine.tools.development.JettyContainerService.startContainer(JettyContainerService.java:254)
    at com.google.appengine.tools.development.AbstractContainerService.startup(AbstractContainerService.java:305)
    at com.google.appengine.tools.development.AutomaticInstanceHolder.startUp(AutomaticInstanceHolder.java:26)
    at com.google.appengine.tools.development.AbstractModule.startup(AbstractModule.java:79)
    at com.google.appengine.tools.development.Modules.startup(Modules.java:97)
    at com.google.appengine.tools.development.DevAppServerImpl.doStart(DevAppServerImpl.java:255)
    at com.google.appengine.tools.development.DevAppServerImpl.access$000(DevAppServerImpl.java:47)
    at com.google.appengine.tools.development.DevAppServerImpl$1.run(DevAppServerImpl.java:213)
    at com.google.appengine.tools.development.DevAppServerImpl$1.run(DevAppServerImpl.java:211)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.google.appengine.tools.development.DevAppServerImpl.start(DevAppServerImpl.java:211)
    at com.google.appengine.tools.development.DevAppServerMain$StartAction.apply(DevAppServerMain.java:277)
    at com.google.appengine.tools.util.Parser$ParseResult.applyArgs(Parser.java:48)
    at com.google.appengine.tools.development.DevAppServerMain.run(DevAppServerMain.java:219)
    at com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMain.java:210)

Apr 12, 2014 2:10:48 AM com.google.apphosting.utils.jetty.JettyLogger info
INFO: Started SelectChannelConnector@127.0.0.1:8888
Apr 12, 2014 2:10:48 AM com.google.appengine.tools.development.AbstractModule startup
INFO: Module instance default is running at http://localhost:8888/
Apr 12, 2014 2:10:48 AM com.google.appengine.tools.development.AbstractModule startup
INFO: The admin console is running at http://localhost:8888/_ah/admin
Apr 12, 2014 2:10:48 AM com.google.appengine.tools.development.DevAppServerImpl doStart
INFO: Dev App Server is now running

当我尝试在浏览器中打开时说 

HTTP ERROR: 404

Problem accessing /. Reason:

    NOT_FOUND
Powered by Jetty://

2 个解决方案

解决方案1
 0  2014-05-07 08:17:18

我将Jersey 1.18与Google App Engine SDK 1.8.8没有问题。 尝试使用这些版本，一切都会正常。

解决方案2
 0  2014-07-02 07:03:07

错误讯息 

java.lang.IncompatibleClassChangeError: Implementing class

应该提供线索-尽管它并不太有用，但这可能意味着该应用程序已在类路径的某个位置成功加载了一个类及其接口，但是它们不兼容。

在错误日志中高一点： 

WARNING: failed com.google.appengine.tools.development.DevAppEngineWebAppContext@7adb5354{/,B:\Programming\Java EE\CIT Tracker Web Service\war}: java.lang.IncompatibleClassChangeError: Implementing class

看起来它正在使用本地Windows驱动器上的路径，其中带有空格-请勿在路径中使用空格，Microsoft允许Windows95使用它，此后一直引起问题，并且不指定本地路径驱动部署-它需要相对于应用程序。

希望对您有所帮助，抱歉，不要更具体。

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