Checkstyle CustomImportOrder
Fix import order in Java class using Checkstyle's CustomImportOrder module. This article explains how I did it for Nuxeo Online Services.
Learning Checkstyle
Checkstyle is a development tool to help programmers write Java code that adheres to a coding standard. By default it supports the Google Java Style Guide and Sun Code Conventions, but is highly configurable. It can be invoked with an ANT task and a command line program.