与AWS的SimpleDB从的Java Servlet创建域SimpleDB、AWS、Servlet、Java
我是一名大学生工作的一个研究项目，涉及迁移Web应用程序以亚马逊的云。我花了上个学期在使用Servlet，并能得到广大的应用程序的功能使用的Java Servlet在Tomcat的运行工作。
我现在正在试图整合亚马逊网络服务，如SimpleDB的和电子邮件服务。我开发使用Eclipse的Java EE的Web开发人员靛蓝IDE。我已经安装了AWS插件，我能够运行示例code，亚马逊提供了调用深发展和SES成功。
然而，当我试图直接或通过我收到以下错误一个单独的类来调用从servlet像SimpleDB的服务：
HTTP状态500 -
类型异常报告
消息
说明服务器遇到内部错误（）pvented了$ P $ 它满足了这一请求。
除了
javax.servlet.ServletException：错误实例化servlet类 org.comtor.cloud.api.APIservlet org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:472） org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:98） org.apache.catalina.valves.AccessLogValve.invoke（AccessLogValve.java:928） org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:407） org.apache.coyote.http11.AbstractHttp11Processor.process（AbstractHttp11Processor.java:987） org.apache.coyote.AbstractProtocol $ AbstractConnectionHandler.process（AbstractProtocol.java:539） org.apache.tomcat.util.net.JIoEndpoint $ SocketProcessor.run（JIoEndpoint.java:298） java.util.concurrent.ThreadPoolExecutor中的$ Worker.runTask（ThreadPoolExecutor.java:886） java.util.concurrent.ThreadPoolExecutor中的$ Worker.run（ThreadPoolExecutor.java:908） java.lang.Thread.run（Thread.java:680）根本原因
java.lang.NoClassDefFoundError的：COM / amazonaws /认证/ AWSCredentials java.lang.Class.getDeclaredConstructors0（本机方法） java.lang.Class.privateGetDeclaredConstructors（Class.java:2389） java.lang.Class.getConstructor0（Class.java:2699） java.lang.Class.newInstance0（Class.java:326） java.lang.Class.newInstance（Class.java:308） org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:472） org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:98） org.apache.catalina.valves.AccessLogValve.invoke（AccessLogValve.java:928） org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:407） org.apache.coyote.http11.AbstractHttp11Processor.process（AbstractHttp11Processor.java:987） org.apache.coyote.AbstractProtocol $ AbstractConnectionHandler.process（AbstractProtocol.java:539） org.apache.tomcat.util.net.JIoEndpoint $ SocketProcessor.run（JIoEndpoint.java:298） java.util.concurrent.ThreadPoolExecutor中的$ Worker.runTask（ThreadPoolExecutor.java:886） java.util.concurrent.ThreadPoolExecutor中的$ Worker.run（ThreadPoolExecutor.java:908） java.lang.Thread.run（Thread.java:680）根本原因
抛出java.lang.ClassNotFoundException：com.amazonaws.auth.AWSCredentials org.apache.catalina.loader.WebappClassLoader.loadClass（WebappClassLoader.java:1688） org.apache.catalina.loader.WebappClassLoader.loadClass（WebappClassLoader.java:1533） java.lang.Class.getDeclaredConstructors0（本机方法） java.lang.Class.privateGetDeclaredConstructors（Class.java:2389） java.lang.Class.getConstructor0（Class.java:2699） java.lang.Class.newInstance0（Class.java:326） java.lang.Class.newInstance（Class.java:308） org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:472） org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:98） org.apache.catalina.valves.AccessLogValve.invoke（AccessLogValve.java:928） org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:407） org.apache.coyote.http11.AbstractHttp11Processor.process（AbstractHttp11Processor.java:987） org.apache.coyote.AbstractProtocol $ AbstractConnectionHandler.process（AbstractProtocol.java:539） org.apache.tomcat.util.net.JIoEndpoint $ SocketProcessor.run（JIoEndpoint.java:298） java.util.concurrent.ThreadPoolExecutor中的$ Worker.runTask（ThreadPoolExecutor.java:886） java.util.concurrent.ThreadPoolExecutor中的$ Worker.run（ThreadPoolExecutor.java:908） java.lang.Thread.run（Thread.java:680）注完整的堆栈跟踪 根本原因是在Apache Tomcat的/ 7.0.23日志可用。
的Apache Tomcat / 7.0.23
我的code是这样的：
包org.comtor.cloud.api;
进口java.io. *;
进口javax.servlet.http包*。
导入的javax.servlet。*;
进口com.amazonaws.auth.BasicAWSCredentials;
进口com.amazonaws.services.simpledb.AmazonSimpleDBClient;
进口com.amazonaws.services.simpledb.model.CreateDomainRequest;
进口java.io.IOException异常;
@燮pressWarnings（串行）
公共类APIservlet延伸的HttpServlet {
公共无效的doGet（HttpServletRequest的要求，
HttpServletResponse的响应）
抛出了ServletException，IOException异常
{
的doPost（请求，响应）;
}
公共无效的doPost（HttpServletRequest的要求，
HttpServletResponse的响应）
抛出了ServletException，IOException异常{
PrintWriter的输出= response.getWriter（）;
// AWS证书
字符串sAccessKey =myAccessKey;
字符串sSecretKey =mySecretKey;
//验证AWS账户
BasicAWSCredentials oAWSCredentials =新BasicAWSCredentials（sAccessKey，sSecretKey）;
AmazonSimpleDBClient awsSimpleDBClient =新AmazonSimpleDBClient（oAWSCredentials）;
//尝试访问的SimpleDB
尝试
{
的System.out.println（连接到简单的数据库）;
//创建一个域
字符串myDomain的=的MyStore;
的System.out.println（创建域称为+ myDomain的+\ñ）;
awsSimpleDBClient.createDomain（新CreateDomainRequest（myDomain的））;
的System.out.println（作了）;
}
//打印错误堆栈跟踪
赶上（抛出：NoSuchAlgorithmException E）
{
e.printStackTrace（）;
}
//关闭的PrintWriter
out.close（）;
}
}
**访问和放大器;密钥由code删除**
这同样适用于SES。我也尝试过使用的Java库像typica'，仍然收到NoClassDef错误。我在我的构建路径的AWS库下的库文件夹和jar包/班似乎是在那里。所以我不确定为什么我不能使用这些类从我的servlet与SimpleDB的交互。
我会非常AP preciate在这个问题上的任何帮助。我相信，我不完全理解如何从网络环境调用AWS深发展。
感谢你。
解决方案抛出java.lang.ClassNotFoundException：com.amazonaws.auth.AWSCredentials表明这个类是不是在你的类路径中。确保包含com.amazonaws.auth.AWSCredentials类的jar包含在你的web应用程序的WEB-INF / lib文件夹。
I am a university student working on a research project that involves migrating a web application to Amazon's cloud. I spent the last semester working with servlets and was able to get the majority of the app's functionality working using a java servlet running in Tomcat.
I am now trying to integrate Amazon Web Services such as the SimpleDB and E-mail service. I develop using the Eclipse Java EE for Web Developers Indigo IDE. I have the AWS plugin installed and am able to run sample code that Amazon provides to call SDB and SES successfully.
However when I attempt to call a service like simpleDB from the servlet either directly or through a separate class I receive the following error:
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: Error instantiating servlet class org.comtor.cloud.api.APIservlet org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:928) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987) org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:539) org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:298) java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) java.lang.Thread.run(Thread.java:680) root cause
java.lang.NoClassDefFoundError: com/amazonaws/auth/AWSCredentials java.lang.Class.getDeclaredConstructors0(Native Method) java.lang.Class.privateGetDeclaredConstructors(Class.java:2389) java.lang.Class.getConstructor0(Class.java:2699) java.lang.Class.newInstance0(Class.java:326) java.lang.Class.newInstance(Class.java:308) org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:928) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987) org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:539) org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:298) java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) java.lang.Thread.run(Thread.java:680) root cause
java.lang.ClassNotFoundException: com.amazonaws.auth.AWSCredentials org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1688) org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1533) java.lang.Class.getDeclaredConstructors0(Native Method) java.lang.Class.privateGetDeclaredConstructors(Class.java:2389) java.lang.Class.getConstructor0(Class.java:2699) java.lang.Class.newInstance0(Class.java:326) java.lang.Class.newInstance(Class.java:308) org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:928) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987) org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:539) org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:298) java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) java.lang.Thread.run(Thread.java:680) note The full stack trace of the root cause is available in the Apache Tomcat/7.0.23 logs.
Apache Tomcat/7.0.23
My code looks like this:
package org.comtor.cloud.api;
import java.io.*;
import javax.servlet.http.*;
import javax.servlet.*;
import com.amazonaws.auth.BasicAWSCredentials;
import com.amazonaws.services.simpledb.AmazonSimpleDBClient;
import com.amazonaws.services.simpledb.model.CreateDomainRequest;
import java.io.IOException;
@SuppressWarnings("serial")
public class APIservlet extends HttpServlet {
public void doGet (HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException
{
doPost(request, response);
}
public void doPost(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
PrintWriter out = response.getWriter();
// AWS Credentials
String sAccessKey = "myAccessKey";
String sSecretKey = "mySecretKey";
// Authenticate AWS account
BasicAWSCredentials oAWSCredentials = new BasicAWSCredentials(sAccessKey, sSecretKey);
AmazonSimpleDBClient awsSimpleDBClient = new AmazonSimpleDBClient(oAWSCredentials);
// Try to access simpleDB
try
{
System.out.println("Connecting to Simple Database");
// Create a domain
String myDomain = "MyStore";
System.out.println("Creating domain called " + myDomain + ".\n");
awsSimpleDBClient.createDomain(new CreateDomainRequest(myDomain));
System.out.println("Connection Made");
}
// Print Error Stack Trace
catch (NoSuchAlgorithmException e)
{
e.printStackTrace();
}
// Close PrintWriter
out.close();
}
}
** Access & Secret Keys removed from code **
The same goes for SES. I have also tried using a java library like 'typica' and still receive a NoClassDef error. I have the AWS library in my build path under the libraries folder and the jar package / classes seem to be there. So I am unsure why I am unable to use these classes to interact with simpleDB from my servlet.
I'd greatly appreciate any help on this matter. I believe I am not fully understanding how to call AWS SDB from a web environment.
Thank you.
解决方案java.lang.ClassNotFoundException: com.amazonaws.auth.AWSCredentials indicates that this class is not on your classpath. Make sure that the jar containing the com.amazonaws.auth.AWSCredentials class is included in your web application's WEB-INF/lib folder.
上一篇：好让在Android的用户的位置的方法好让、位置、方法、用户
下一篇：在注销，明确活动历史堆栈，preventing＆QUOT;返回]无法打开登录的，只有Activites按钮堆栈、无法打开、按钮、明确
