Matt RaibleMatt Raible is a Web Developer and Java Champion. Connect with him on LinkedIn.

The Angular Mini-Book The Angular Mini-Book is a guide to getting started with Angular. You'll learn how to develop a bare-bones application, test it, and deploy it. Then you'll move on to adding Bootstrap, Angular Material, continuous integration, and authentication.

Spring Boot is a popular framework for building REST APIs. You'll learn how to integrate Angular with Spring Boot and use security best practices like HTTPS and a content security policy.

For book updates, follow @angular_book on Twitter.

The JHipster Mini-Book The JHipster Mini-Book is a guide to getting started with hip technologies today: Angular, Bootstrap, and Spring Boot. All of these frameworks are wrapped up in an easy-to-use project called JHipster.

This book shows you how to build an app with JHipster, and guides you through the plethora of tools, techniques and options you can use. Furthermore, it explains the UI and API building blocks so you understand the underpinnings of your great application.

For book updates, follow @jhipster-book on Twitter.

10+ YEARS


Over 10 years ago, I wrote my first blog post. Since then, I've authored books, had kids, traveled the world, found Trish and blogged about it all.

Tomcat/Oracle Connectivity Problems

I had a problem that I thought I fixed a while back. The problem was that our firewall between Tomcat and Oracle would close our database connection after 90 minutes of inactivity. We first solved this problem by using a Servlet/Ant Task/cron job combination to ping and use the DBCP connection pool we'd configured in Tomcat. This worked, for a little while. Then we realized we had to also ping the JDBCRealm, so we used a login test (via WebTest) and added this to our Ant Task/cron job. Again, this worked for a couple of months, until a QA Expert came on board and starting using WAPT to load test our app. Then we began having issues with many connections being opened (20+), then they were closed by the firewall, and when the app would try to re-use these connections, they wouldn't respond, and the app would enter into the "dithering idiot" mode. We finally figured out a solution, rather than workarounds, and here it is:

// In the file:
$ORACLE_HOME/network/Admin/SQLNET.ORA

// Add the following line to check every 10 minutes
SQLNET.EXPIRE_TIME=10

Posted in Java at Jun 02 2003, 09:25:58 AM MDT Add a Comment
Comments:

Post a Comment:
  • HTML Syntax: Allowed