upgrade to Sling API 2.9.0 to leverage JSR 305 annotations fully

fix some potential NPEs

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1785540 13f79535-47bb-0310-9956-ffa450edef68
6 files changed
tree: 97d910228c8cf4af2811aa9dfb6cfd4c3c9e2110
  1. src/
  2. pom.xml