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POCreating Domain with AWS SimpleDB from Java Servlet
 

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  1. POCreating Domain with AWS SimpleDB from Java Servlet
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    <p>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.</p> <p>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.</p> <p>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:</p> <blockquote> <blockquote> <p>HTTP Status 500 -</p> </blockquote> <p>type Exception report</p> <p>message</p> <p>description The server encountered an internal error () that prevented it from fulfilling this request.</p> <p>exception</p> <p>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</p> <p>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</p> <p>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.</p> <p>Apache Tomcat/7.0.23</p> </blockquote> <p>My code looks like this:</p> <pre><code>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(); } } </code></pre> <p>** Access &amp; Secret Keys removed from code **</p> <p>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.</p> <p>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.</p> <p>Thank you.</p>
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