Error in request from Google Appengine to pub sub

Question

After I upgraded to app engine (1.9.54) and Java version (1.8) , I got this error when I made a pub-sub request:

  java.lang.IllegalAccessError: com/google/appengine/repackaged/com/google/common/base/Platform at com.google.appengine.repackaged.com.google.common.base.Ticker$1.read(Ticker.java:69) at com.google.appengine.repackaged.com.google.common.base.Stopwatch.elapsedNanos(Stopwatch.java:181) at com.google.appengine.repackaged.com.google.common.base.Stopwatch.elapsed(Stopwatch.java:194) at com.google.appengine.repackaged.com.google.common.cache.LocalCache$LoadingValueReference.elapsedNanos(LocalCache.java:3665) at com.google.appengine.repackaged.com.google.common.cache.LocalCache$Segment.getAndRecordStats(LocalCache.java:2381) at com.google.appengine.repackaged.com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2336) at com.google.appengine.repackaged.com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2294) at com.google.appengine.repackaged.com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2207) at com.google.appengine.repackaged.com.google.common.cache.LocalCache.get(LocalCache.java:4062) at com.google.appengine.repackaged.com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:4066) at com.google.appengine.repackaged.com.google.common.cache.LocalCache$LocalLoadingCache.get(LocalCache.java:4995) at com.google.appengine.repackaged.com.google.common.cache.LocalCache$LocalLoadingCache.getUnchecked(LocalCache.java:5001) at com.google.appengine.api.appidentity.AppIdentityServiceImpl.getAccessToken(AppIdentityServiceImpl.java:272) at com.google.api.client.googleapis.extensions.appengine.auth.oauth2.AppIdentityCredential.intercept(AppIdentityCredential.java:98) at com.google.api.client.googleapis.extensions.appengine.auth.oauth2.AppIdentityCredential$AppEngineCredentialWrapper.intercept(AppIdentityCredential.java:243) at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:868) at 

Answer 1

I think you are using this example https://github.com/GoogleCloudPlatform/cloud-pubsub-samples-java/tree/master/appengine-push which mentions the following:

This example is for using Cloud Pub / Sub in the Engine Engine standard. You may also be interested in checking out the newer Google Cloud Java Platform Client Library, which can be used with Java 8 in App Engine Flexible.