ClassNotFoundException con Google App Engine para Java

Question

Un amigo y yo estamos incursionando en App Engine con el SDK de Java. Hemos juntos un ejemplo de "Hola, Mundo" sin problemas; sin embargo, cuando tratamos de agregar código para hacer una simple llamada a un servicio web utilizando los clases en com.google.api.client.http, nuestro código se compila bien, pero provoca un error de ejecución:

HTTP ERROR 500 

Problem accessing /surreality. Reason: 

    com/google/api/client/http/HttpTransport 

Caused by: 

HTTP ERROR 500 

Problem accessing /surreality. Reason: 

    com/google/api/client/http/javanet/NetHttpTransport 

Caused by: 

java.lang.NoClassDefFoundError: com/google/api/client/http/javanet/ 
NetHttpTransport 
     at 
com.surreality.scratch.SurrealityServlet.performSearch(SurrealityServlet.java: 
31) 
     at 
com.surreality.scratch.SurrealityServlet.doGet(SurrealityServlet.java: 
18) 
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:617) 
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 
     at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java: 
511) 

(... corte)

el código en cuestión es:

package com.surreality.scratch; 

import java.io.IOException; 
import javax.servlet.http.*; 
import java.util.List; 
import com.google.api.client.googleapis.*; 
import com.google.api.client.http.*; 
import com.google.api.client.http.javanet.*; 
import com.google.api.client.util.Key; 

@SuppressWarnings("serial") 
public class SurrealityServlet extends HttpServlet { 

     public void doGet(HttpServletRequest req, HttpServletResponse resp) 
         throws IOException { 
       resp.setContentType("text/plain"); 
       try { 
         this.performSearch(resp); 
         resp.getWriter().println("Here..."); 
       } catch (Exception e) { 
         resp.getWriter().println("Onoes!"); 
       } 
     } 

     public void performSearch(HttpServletResponse resp) throws Exception 
{ 

       try { 
         resp.getWriter().println("Perform Search ...."); 
         resp.getWriter().println("-------------------"); 

         HttpTransport transport = new NetHttpTransport(); // This line 
causes our servlet to implode on every request 
       } catch (Exception e) { 
         resp.getWriter().println("failed"); 
         throw e; 
       } 
     } 
} 

nuestra mejor estimación fue una discrepancia entre la ruta de clase de construcción y la ruta de clase tiempo de ejecución, pero nuestra ruta de clases de tiempo de ejecución parece para estar bien. El HttpTransport clase está en el google-api-cliente-1.4.1-beta.jar biblioteca, y que se incluye en la línea de comandos Eclipse está generando para ejecutar el proyecto:

/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home/bin/ 
java -Ddatastore.default_high_rep_job_policy_unapplied_job_pct=50 - 
Xmx512m -javaagent:/Applications/eclipse/plugins/ 
com.google.appengine.eclipse.sdkbundle_1.5.3.r37v201108301710/ 
appengine-java-sdk-1.5.3/lib/agent/appengine-agent.jar - 
XstartOnFirstThread -Xbootclasspath/p:/Applications/eclipse/plugins/ 
com.google.appengine.eclipse.sdkbundle_1.5.3.r37v201108301710/ 
appengine-java-sdk-1.5.3/lib/override/appengine-dev-jdk-overrides.jar - 
Dfile.encoding=MacRoman -classpath /Users/Arkaaito/Documents/AppEngine/ 
scratch/surreality/war/WEB-INF/classes:/Applications/eclipse/plugins/ 
com.google.appengine.eclipse.sdkbundle_1.5.3.r37v201108301710/ 
appengine-java-sdk-1.5.3/lib/shared/appengine-local-runtime- 
shared.jar:/Applications/eclipse/plugins/ 
com.google.appengine.eclipse.sdkbundle_1.5.3.r37v201108301710/ 
appengine-java-sdk-1.5.3/lib/shared/el-api.jar:/Applications/eclipse/ 
plugins/com.google.appengine.eclipse.sdkbundle_1.5.3.r37v201108301710/ 
appengine-java-sdk-1.5.3/lib/shared/jsp/repackaged-appengine- 
ant-1.7.1.jar:/Applications/eclipse/plugins/ 
com.google.appengine.eclipse.sdkbundle_1.5.3.r37v201108301710/ 
appengine-java-sdk-1.5.3/lib/shared/jsp/repackaged-appengine-ant- 
launcher-1.7.1.jar:/Applications/eclipse/plugins/ 
com.google.appengine.eclipse.sdkbundle_1.5.3.r37v201108301710/ 
appengine-java-sdk-1.5.3/lib/shared/jsp/repackaged-appengine- 
jasper-6.0.29.jar:/Applications/eclipse/plugins/ 
com.google.appengine.eclipse.sdkbundle_1.5.3.r37v201108301710/ 
appengine-java-sdk-1.5.3/lib/shared/jsp/repackaged-appengine-jasper- 
el-6.0.29.jar:/Applications/eclipse/plugins/ 
com.google.appengine.eclipse.sdkbundle_1.5.3.r37v201108301710/ 
appengine-java-sdk-1.5.3/lib/shared/jsp/repackaged-appengine-tomcat- 
juli-6.0.29.jar:/Applications/eclipse/plugins/ 
com.google.appengine.eclipse.sdkbundle_1.5.3.r37v201108301710/ 
appengine-java-sdk-1.5.3/lib/shared/jsp-api.jar:/Applications/eclipse/ 
plugins/com.google.appengine.eclipse.sdkbundle_1.5.3.r37v201108301710/ 
appengine-java-sdk-1.5.3/lib/shared/servlet-api.jar:/Applications/ 
eclipse/plugins/ 
com.google.appengine.eclipse.sdkbundle_1.5.3.r37v201108301710/ 
appengine-java-sdk-1.5.3/lib/user/appengine-api-1.0-sdk-1.5.3.jar:/ 
Applications/eclipse/plugins/ 
com.google.appengine.eclipse.sdkbundle_1.5.3.r37v201108301710/ 
appengine-java-sdk-1.5.3/lib/user/appengine-api-labs-1.5.3.jar:/ 
Applications/eclipse/plugins/ 
com.google.appengine.eclipse.sdkbundle_1.5.3.r37v201108301710/ 
appengine-java-sdk-1.5.3/lib/user/appengine-jsr107cache-1.5.3.jar:/ 
Applications/eclipse/plugins/ 
com.google.appengine.eclipse.sdkbundle_1.5.3.r37v201108301710/ 
appengine-java-sdk-1.5.3/lib/user/jsr107cache-1.1.jar:/Applications/ 
eclipse/plugins/ 
com.google.appengine.eclipse.sdkbundle_1.5.3.r37v201108301710/ 
appengine-java-sdk-1.5.3/lib/user/orm/datanucleus- 
appengine-1.0.9.final.jar:/Applications/eclipse/plugins/ 
com.google.appengine.eclipse.sdkbundle_1.5.3.r37v201108301710/ 
appengine-java-sdk-1.5.3/lib/user/orm/datanucleus-core-1.1.5.jar:/ 
Applications/eclipse/plugins/ 
com.google.appengine.eclipse.sdkbundle_1.5.3.r37v201108301710/ 
appengine-java-sdk-1.5.3/lib/user/orm/datanucleus-jpa-1.1.5.jar:/ 
Applications/eclipse/plugins/ 
com.google.appengine.eclipse.sdkbundle_1.5.3.r37v201108301710/ 
appengine-java-sdk-1.5.3/lib/user/orm/geronimo-jpa_3.0_spec-1.1.1.jar:/ 
Applications/eclipse/plugins/ 
com.google.appengine.eclipse.sdkbundle_1.5.3.r37v201108301710/ 
appengine-java-sdk-1.5.3/lib/user/orm/geronimo-jta_1.1_spec-1.1.1.jar:/ 
Applications/eclipse/plugins/ 
com.google.appengine.eclipse.sdkbundle_1.5.3.r37v201108301710/ 
appengine-java-sdk-1.5.3/lib/user/orm/jdo2-api-2.3-eb.jar:/ 
Applications/eclipse/plugins/ 
com.google.appengine.eclipse.sdkbundle_1.5.3.r37v201108301710/ 
appengine-java-sdk-1.5.3/lib/appengine-tools-api.jar:/Users/Arkaaito/ 
Documents/AppEngine/scratch/surreality/war/WEB-INF/lib/google-api-java- 
client-1.4.1-beta/dependencies/httpclient-4.0.3.jar:/Users/Arkaaito/ 
Documents/AppEngine/scratch/surreality/war/WEB-INF/lib/google-api-java- 
client-1.4.1-beta/dependencies/httpcore-4.0.1.jar:/Users/Arkaaito/ 
Documents/AppEngine/scratch/surreality/war/WEB-INF/lib/google-api-java- 
client-1.4.1-beta/google-api-client-1.4.1-beta.jar:/Users/Arkaaito/ 
Documents/AppEngine/scratch/surreality/war/WEB-INF/lib/google-api-java- 
client-1.4.1-beta/google-api-client-googleapis-1.4.1-beta.jar:/Users/ 
Arkaaito/Documents/AppEngine/scratch/surreality/war/WEB-INF/lib/google- 
api-java-client-1.4.1-beta/google-api-client-extensions-1.4.1- 
beta.jar:/Users/Arkaaito/Documents/AppEngine/scratch/surreality/war/ 
WEB-INF/lib/google-api-java-client-1.4.1-beta/google-api-client- 
googleapis-extensions-1.4.1-beta.jar:/Users/Arkaaito/Documents/ 
AppEngine/scratch/surreality/war/WEB-INF/lib/geronimo- 
jpa_3.0_spec-1.1.1.jar:/Users/Arkaaito/Documents/AppEngine/scratch/ 
surreality/war/WEB-INF/lib/geronimo-jta_1.1_spec-1.1.1.jar 
com.google.appengine.tools.development.DevAppServerMain --port=3333/
Users/Arkaaito/Documents/AppEngine/scratch/surreality/war 

Cualquier persona ha funcionado en este problema antes, o alguien tiene sugerencias sobre lo que deberíamos hacer para depurar? Estoy seguro de que es algo simple, probablemente un problema de configuración, pero como novatos no estamos seguros de qué mirar además de los classpaths.

Answer 1

Dentro de su directorio WEB-INF/lib, tiene algunos subdirectorios google-api-java-client-1.4.1-beta y google-api-java-client-1.4.1-beta/dependencies con frascos de esos directorios que deben estar directamente dentro WEB-INF/lib

Answer 2

¿Tiene all of the dependencies en WEB-INF/lib?