From jasonhall@google.com on October 01, 2012 09:31:59

Version of google-api-java-client (e.g. 1.5.0-beta)? HEAD Java environment (e.g. Java 6, Android 2.3, App Engine)? App Engine Describe the problem. I'd like to perform a batch request, but I don't particularly care about the respective responses. I essentially want to "fire and forget" a series of API requests.

Currently I'm calling:

BatchRequest batch = compute.batch();
for (...) {
compute.instances().insert(...).queue(batch, null);
}
batch.execute();

This results in an NPE because of a Preconditions.checkNotNull check on the callback:
java.lang.NullPointerException
at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:193)
at com.google.api.client.googleapis.batch.BatchRequest.queue(BatchRequest.java:161)
at com.google.api.services.compute.Compute$Instances$Insert.queue(Compute.java:2642) How would you expect it to be fixed? Either remove the checkNotNull check, or provide another queue() method that doesn't take a callback. Ideally requests that don't configure a callback would also skip parsing of the response entirely, since nothing downstream requires any details of the response.

This would lead to clearer more succinct code than the current working alternative, which is to define a no-op JsonBatchCallback instance that does nothing.

Original issue: http://code.google.com/p/google-api-java-client/issues/detail?id=620