AppEngine ClassNotFoundException: com.google.appengine.api.datastore.DatastoreServiceFactory

Question

While I am trying to use the low level DataStore API in AppEngine, I am getting an interesting ClassNotFoundException. This exception is happening in the cloud server, not in the local instance. Locally I use appengine-java-sdk-1.7.4.

java.lang.NoClassDefFoundError: com/google/appengine/api/datastore/DatastoreServiceFactory
    at org.himadri.scradiolisteners.server.FetchingServlet.writeDataLowLevel(FetchingServlet.java:47)
    at org.himadri.scradiolisteners.server.FetchingServlet.doGet(FetchingServlet.java:39)
    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)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
    at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:102)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:35)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
    at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:266)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:326)
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
    at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
    at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:76)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
    at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:146)
    at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:447)
    at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:454)
    at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:461)
    at com.google.tracing.TraceContext.runInContext(TraceContext.java:703)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:338)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:330)
    at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:458)
    at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:251)
    at java.lang.Thread.run(Thread.java:679)
Caused by: java.lang.ClassNotFoundException: com.google.appengine.api.datastore.DatastoreServiceFactory
    at com.google.appengine.runtime.Request.process-e485d13152ebc944(Request.java)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
    at org.himadri.scradiolisteners.server.FetchingServlet.writeDataLowLevel(FetchingServlet.java:47)
    at org.himadri.scradiolisteners.server.FetchingServlet.doGet(FetchingServlet.java:39)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:326)
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
    at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
    at com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:454)
    at com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:461)
    at com.google.tracing.TraceContext.runInContext(TraceContext.java:703)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:338)
    at com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:330)
    at com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:458)
    ... 1 more

the error itself is already there. it would also help you can post your code that generates this error — KyelJmD
– KyelJmD, Commented Dec 28, 2012 at 18:00

ecbrodie · Accepted Answer · 2012-12-28 18:15:10Z

5

Sounds like one of two things to me.

1: You are trying to run the GAE code in a unit test, in which case you need to use code specified in this page.

2: You did not add all the required jars into the classpath.

answered Dec 28, 2012 at 18:15

ecbrodie

12k23 gold badges76 silver badges124 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

kavai77 · Accepted Answer · 2012-12-28 21:27:54Z

5

The problem was I did not include the appengine-api-1.0-sdk.jar in the uploaded content:

<dependency>
    <groupId>com.google.appengine</groupId>
    <artifactId>appengine-api-1.0-sdk</artifactId>
    <version>1.7.4</version>
    <scope>provided</scope>
</dependency>

By deleting the scope: provided row, the problem has been solved. I just didn't think that this API is not available on the cloud server.

answered Dec 28, 2012 at 21:27

kavai77

6,6468 gold badges36 silver badges50 bronze badges

3 Comments

ecbrodie Over a year ago

In any app you upload to GAE, you need to provide the third-party dependencies. I'm glad you were able to solve the issue.

kavai77 Over a year ago

thanks, ecbrodie. The funny thing is tha appengine-api is not a third-party library, but the container-services themself :-)

EliuX Over a year ago

What you can do is to delete the <scope>provided</scope> declaration while working locally, and execute mvn install so you actually download this dependency and then restore this configuration. Also you can have a profile for when working locally, so the value of the scope is compile. This worked for me.

Collectives™ on Stack Overflow

AppEngine ClassNotFoundException: com.google.appengine.api.datastore.DatastoreServiceFactory

2 Answers 2

Comments

3 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

3 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related