Pub/Sub give problem in AppEngine with Standard Environment with Java 7

Hi, I have created Google PUB/SUB using topic. I get error in my Subscriber code. my code works on my local tomcat server but when I deployed it on Google cloud AppEngine with standard environment. It gives following error.
Could not initialize class com.google.cloud.pubsub.v1.Subscriber

Initialization of Subscriber instance is failed on Google cloud AppEngine whereas Subscriber is initialized in local tomcat
com.google.cloud.pubsub.v1.Subscriber subscriber = Subscriber.defaultBuilder(subscription,receiver).build();

I have used following Maven dependencies

com.google.appengine
appengine-api-1.0-sdk
1.9.54

com.google.api-client google-api-client-appengine 1.21.0 javax.servlet servlet-api javax.servlet servlet-api com.google.guava guava-jdk5 com.google.apis google-api-services-pubsub v1-rev8-1.21.0 com.google.cloud google-cloud-examples 0.22.0-alpha com.google.appengine.tools appengine-gcs-client 0.5 com.google.http-client google-http-client com.google.appengine appengine-remote-api 1.9.32