This week's book giveaways are in the Cloud and AI/ML forums. We're giving away four copies each of Cloud Native Patterns and Natural Language Processing and have the authors on-line! See this thread and this one for details.
The Struts team has announced the End of Life for Struts 2.3. For the next six months, they will remediate security issues as practical. After six months, approximately May 2019, Struts 2.3 will no longer be updated.
See the announcement here Update your applications to Struts 2.5 as soon as possible. There is an upgrade guide in the Struts documentation (note that this article is part of the deprecated Struts documentation Wiki. Please post if you find a more up-to-date source).