GAE java.lang.IllegalStateException: Must call one of set*BlobStorage() first

Question

I am trying to upload a file in GAE using the Blobstore API. I am getting the following exception when running the GAE server locally (dev mode):

WARNING: /_         


        

Answer 1

The issue was caused by having the stubs and testing jars included on the classpath when running the dev app server. If you are using maven, simply change the scope of the dependency:

    com.google.appengine
    appengine-api-stubs
    ${gae.version}
    test


    com.google.appengine
    appengine-testing
    ${gae.version}
    test

If you are not using maven, make sure these jars are not in your WEB-INF/lib or classpath.