From the Trenches of the Enterprise Software

Yakov Fain

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Top Stories by Yakov Fain

In 2011 Wiley (Wrox) published my book “Java Programming. 24-Hour Trainer“. To be honest, I don’t like the title because it misleads people as if this book promises that the reader can learn Java within 24 hours. But creators of this series (many titles were published under this umbrella) meant to say that this book was like your personal instructor; 24 hours a day. Whatever. It’s not my call. But earlier this year I got a call from the publisher stating that they’re happy with the book sale numbers and want me to update the book and release the second edition reflecting the latest changes in the Java Language. I agreed because with the latest release Java became more interesting than ever. The magnitude of changes to the Java 8 language and APIs can be compared with Java 5 that was released back in 2004. It’s exciting to program in Java again. In the second editio... (more)

Closures in Java With Lambdas

While working on the second edition for my Java 24-hour Trainer book I’m re-writing some of the code samples to use lambda expressions. Today I was re-writing an example for wait/notify for the chapter on multi-threading. Beside illustrating the wait/notify, I used a closure in this example. Since Java closures are not well presented in the blogosphere, I decided to write a quick blog on the subject. My goal was to write a program that starts a thread and waits for the notification from that thread until its execution is completed. When the main thread receives the notification ... (more)

JMS 2.0 remote client for embedded HornetQ in Wildfly 8

While testing the new JMS 2.0 API, I wanted to see an example of the remote client connecting to a messaging server. I decided to start with the HornetQ messaging server that’s embedded into JBoss Wildfly 8. Folks from JBoss sent me a link to the the GitHub project Wildfly/Quickstart with lots of Wildfly Java EE 7 examples. The HelloWorldJMSClient was the one I was looking for. The readme file contains detailed instructions on how to compile and run the example. Seeing a requirement to have Maven 3.1 or better looks like an overkill for a helloworld type example. Installed Maven... (more)

Secrets Of The Masters: Core Java Job Interview Questions

JDJ's Enterprise Editor, Yakov Fain (pictured) writes: If you are planning to hit the job market,  you may need to refresh some of the Java basic terms and techniques to prepare yourself for a technical interview. Let me offer you some of the core Java questions that you might expect during the interviews.  For  most questions  I’ve provided only  short  answers to encourage further research.  I have included only  questions for mid (*) and senior level (**) Java developers. These sample questions could also become handy for people who need to interview Java developers (see also ... (more)

Using URL Shorteners in Technical Documents

I spend a large portion of my time preparing courseware materials, writing books and technical documentation. These documents include hyperlinks, and some of them can be a 100+ character long. Do you include the long URLs in your docs? The immediate answer is to use one of the services like bit.ly, tinyurl.com, is.gd and the like.Beside shortening URLs the may offer other services like click-stats or real-time analytic data. But all of these services are backed by rather small companies. What if your preferred URL shortener is out of business, but thousands of your books are bei... (more)