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1. JPA Mini Book

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3. JUnit Tutorial for Unit Testing

4. Java Annotations Tutorial

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OpenJPA: Memory Leak Case Study

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This article will provide the complete root cause analysis details and resolution of a Java heap memory leak (Apache OpenJPA leak) affecting an Oracle Weblogic server 10.0 production environment. This post will also demonstrate the importance to follow the Java Persistence API best practices when managing the javax.persistence.EntityManagerFactory lifecycle.             Environment specifications Java EE server: ...

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The Good, the Bad, and the Ugly Backlog

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The product backlog is an important tool: It lists ideas, requirements, and new insights. But is it always the right tool to use? This post discusses the strengths of a traditional product backlog together with its limitations. It provides advice on when to use the backlog, and when other tools may be better suited. The Good A traditional product backlog ...

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Starting with WSO2 ESB by running the samples

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I recently joined a new assignment where we have to implement an ESB solution based on the WSO2 toolstack. Although I am familiair with most of the concepts of the ESB and some other implementations (like Mule ESB) it is the first time I will have to work with the WSO2 ESB. Luckily there is a lot of documentation to ...

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11 Agile Myths and 2 Truths

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I deliver a lot of Agile training courses and I give a lot of talks about Agile (BCS Bristol tonight). There are some questions that come up again and again which are the result of myths people have come to believe about Agile. Consequently I spend my time debunking these myths again and again. I’ve been keeping a little list ...

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Promises and Deferred objects in jQuery and AngularJS

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Series of articles about futures/promises without JavaScript would not be complete. Futures (more commonly named promises in JS land) are ubiquitous in JavaScript to the point where we almost don’t recognize them any more. AJAX, timeouts and whole Node.JS are built on top of asynchronous callbacks. Nested callbacks (as we will see in just a second) are so hard to ...

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Fragmented projects and overcommitted people

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In 2010 I wrote two articles on Burn-Out and exhaustion in software teams. Since then there were more and more articles of this kind printed in the major german press. Psychologists warn companies and individuals that we are doing “too much”. I agree with them. We have increased our daily speed by lots, and I believe the results are not ...

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Why Open Source Software?

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I decided to look at something everyone thinks we know well, Open Source Software (OSS)  and see what I discover. The child in me said; “Do it”. The Strange and Not-So-Strange I uncovered No. This is not a high energy physics paper. This is a study on OSS performance.             I scratch my head seeing ...

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