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Java中的GAE Restful Web服務

[英]GAE Restful Web Service in Java

 原文  2014-04-09 16:26:44  6   2    java/ web-services/ google-app-engine/ rest

問題描述

我想在Java中為Google App Engine開發寧靜的Web服務。 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

我使用了許多版本的Jersey，例如1.8、1.5等。如果我在本地服務器上運行該項目，效果很好，但是當我將其部署到google app引擎上時，我可以打開歡迎網頁，但無法訪問網絡服務。

如https://code.google.com/p/googleappengine/wiki/WillItPlayInJava鏈接中所述，GAE支持Jersey 1.5，但是當我在項目中導入這些jar文件時，我無法將其部署在GAE上。

我不知道應該將哪個版本的Jersey與我的Google AppEngine Java SDK 1.9.2一起使用，還是應該使用另一個版本的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>

我的網絡服務課程 

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> ";
    }
}

當我嘗試使用Jersey 2.5和Jersey 1.17時，在本地服務器上收到錯誤 

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

當我嘗試在瀏覽器中打開時說 

HTTP ERROR: 404

Problem accessing /. Reason:

    NOT_FOUND
Powered by Jetty://

2 個解決方案

解決方案1
 0  2014-05-07 08:17:18

我將Jersey 1.18與Google App Engine SDK 1.8.8沒有問題。 嘗試使用這些版本，一切都會正常。

解決方案2
 0  2014-07-02 07:03:07

錯誤訊息 

java.lang.IncompatibleClassChangeError: Implementing class

應該提供線索-盡管它並不太有用，但這可能意味着該應用程序已在類路徑的某個位置成功加載了一個類及其接口，但是它們不兼容。

在錯誤日志中高一點： 

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

看起來它正在使用本地Windows驅動器上的路徑，其中帶有空格-請勿在路徑中使用空格，Microsoft允許Windows95使用它，此后一直引起問題，並且不指定本地路徑驅動部署-它需要相對於應用程序。

希望對您有所幫助，抱歉，不要更具體。

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