failure in the push test #789

In which file did you encounter the issue?

when testing
curl -H "Content-Type: application/json" -i --data @sample_message.json "localhost:8080/pubsub/push?token=dextest"

Did you change the file? If so, how?

Describe the issue

HTTP ERROR 500

Problem accessing /pubsub/push. Reason:

    Server Error

Caused by:

java.lang.NoClassDefFoundError: com/google/auth/ServiceAccountSigner
	at java.lang.ClassLoader.defineClass1(Native Method)
	at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
	at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
	at java.net.URLClassLoader.defineClass(URLClassLoader.java:467