Hi Did you try using URLFetch ?
Check this post from Ikai http://ikaisays.com/2010/06/29/using-asynchronous-urlfetch-on-java-app-engine/ Regards, On Sun, Sep 18, 2011 at 7:46 PM, Arkaaito <alsti...@gmail.com> wrote: > Hello, all! > > A friend and I are dabbling in App Engine using the Java SDK. We've > put together a "Hello, World" example with no problems; however, when > we try to add code to make a simple call to a webservice using the > classes in com.google.api.client.http, our code compiles fine but > causes a runtime error: > > 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) > (...cut) > > The code in question is: > > 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; > } > } > } > > Our best guess was a discrepancy between the build classpath and the > runtime classpath, but our runtime classpath *seems* to be OK. The > HttpTransport class is in the google-api-client-1.4.1-beta.jar > library, and that's included in the command line Eclipse is generating > to run the project: > > /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 > > Has anyone run into this problem before, or does anyone have > suggestions on what we should do to debug? > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine for Java" group. > To post to this group, send email to > google-appengine-java@googlegroups.com. > To unsubscribe from this group, send email to > google-appengine-java+unsubscr...@googlegroups.com. > For more options, visit this group at > http://groups.google.com/group/google-appengine-java?hl=en. > > -- Bruno Fuster -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to google-appengine-java@googlegroups.com. To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
