AWS java SDK manually set signature version

From the S3 Developer Guide - Specifying Signature Version in Request Authentication:

Java SDK

Add the following in your code.

System.setProperty(SDKGlobalConfiguration.ENABLE_S3_SIGV4_SYSTEM_PROPERTY, "true");

Or, on the command line, specify the following.

-Dcom.amazonaws.services.s3.enableV4

It looks like v2 was the default in the AWS SDK previously, but v4 is now the default starting in SDK v1.11.0 (May, 2016).