Migrate from File API to Google Cloud Storage

Question

I'm trying to follow Googles docs on migrating from File API (about to become obsolete) to Google Cloud Storage.

I'm following (using eclipse) https://cloud.google.com/appengine/docs/java/googlecloudstorageclient/migrate#migration (poorly written - out of many other poorly written docs)

I downloaded the client code from https://cloud.google.com/appengine/docs/java/googlecloudstorageclient/download with git and used ant to build it.

than I copied the following jars appengine-gcs-client.jar guava-15.0.jar joda-time-2.3.jar

I removed some old guava jar from my project.

copied PortOfFilesAPIGuestbookServlet to my project

add to web.xml

<servlet>
    <servlet-name>PortOfFilesAPIGuestbookServlet</servlet-name>
    <servlet-class>com.google.appengine.demos.PortOfFilesAPIGuestbookServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>PortOfFilesAPIGuestbookServlet</servlet-name>
    <url-pattern>/tst1</url-pattern>
</servlet-mapping>

and run the example

result:

Error for /tst1 java.lang.NoSuchMethodError: com.google.common.base.Stopwatch.createUnstarted()Lcom/google/common/base/Stopwatch; at com.google.appengine.tools.cloudstorage.RetryHelper.runWithRetries(RetryHelper.java:156) at com.google.appengine.tools.cloudstorage.GcsServiceImpl.createOrReplace(GcsServiceImpl.java:70) at com.google.appengine.demos.PortOfFilesAPIGuestbookServlet.doGet(PortOfFilesAPIGuestbookServlet.java:41) at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)

Please help me to solve it, or supply a link to a proper migration docs.

Thanks

Google Guava is up to version 18. Maybe the version 15 does not contains the required method — Deviling Master

Elia Weiss Elia Weiss · Accepted Answer · 2015-06-18T08:57:58

First, in eclipse, it's not enough to remove a jar from the Build path - you must delete it from the war/WEB-INF/lib.

otherwise it will still be used in run time (the build path is for compile time only)

in my case i had to delete the old guava jar from my lib.

After that I still had some missing stuff issues - I used http://grepcode.com/ to find the relevant jars.

I ended up removing google-collect-1.0-rc1.jar, guava-11.0.2.jar, servlet-api-2.3.jar from my lib

NOTE: In order for the code to work on the google server as well I had to copy all jars from appengine-gcs-client-read-only/java/dist to the project lib

Migrate from File API to Google Cloud Storage

1 Answers