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Spring 4: CGLIB-based proxy classes with no default constructor

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In Spring, if the class of a target object that is to be proxied doesn’t implement any interfaces, then a CGLIB-based proxy will be created. Prior to Spring 4, CGLIB-based proxy classes require a default constructor. And this is not the limitation of CGLIB library, but Spring itself. Fortunately, as of Spring 4 this is no longer an issue. CGLIB-based ...

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Do You Encourage People to Bring You Problems?

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One of the familiar tensions in management is how you encourage or discourage people from bringing you problems. One of my clients had a favorite saying, “Don’t bring me problems. Bring me solutions.” I could see the problems that saying caused in the organization. He prevented people from bringing him problems until the problems were enormous. He didn’t realize that ...

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Locking and Logging

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Plumbr has been known as the tool to tackle memory leaks. As little as two months ago we released GC optimization features. But we have not been sitting idle after this – for months we have been working on lock contention detection. From the test runs we have discovered many awkward concurrency issues in hundreds of different applications. Many of ...

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Java EE7 and Maven project for newbies – part 7

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Resuming from the previous parts Part #1, Part #2, Part #3, Part #4, Part #5 , Part #6 In the previous post (num 6) we discovered how we can unit test our JPA2 domain model, using Arquillian and Wildfly 8.1 In the post we made a simple configuration decision, we used the internal H2 database that is bundled with Wildfly ...

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Behavior-Driven RESTful APIs

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In the RESTBucks example, the authors present a useful state diagram that describes the actions a client can perform against the service. Where does such an application state diagram come from? Well, it’s derived from the requirements, of course. Since I like to specify requirements using examples, let’s see how we can derive an application state diagram from BDD-style requirements. ...

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Hibernate and UUID identifiers

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Introduction In my previous post I talked about UUID surrogate keys and the use cases when there are more appropriate than the more common auto-incrementing identifiers. A UUID database type There are several ways to represent a 128-bit UUID, and whenever in doubt I like to resort to Stack Exchange for an expert advice.     Because table identifiers are ...

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Graduate School: ”Do… Or Do Not. There Is No Try” – Yoda

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I recently completed my Master of Science in Computer Science.  There were both good and bad experiences about graduate school while working full time, and I wanted to share them to help those who are considering taking that leap. Before I do, I wanted to provide a little history on why I choose to pursue a graduate degree in Computer Science. My undergraduate and ...

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Software Defined Everything

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The other day Taxis in London where on strike because Uber was setting up shop in London. Do you know a lot of people that still send paper letters? Book holiday flights via a travel agent?  Buy books in book stores? Rent DVD movies? 5 smart programmers can bring down a whole multi-billion industry and change people’s habits. It has long been ...

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Agile VS Real Life

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The Agile Manifesto tells us that: “We have come to value “Individuals and Interaction over Processes and Tools” Reality tells us otherwise. Want to do unit testing? Pick up a test framework and you’re good to go. Want your organization to be agile? Scrum is very simple, and SAFe is scaled simplicity. We know there are no magic bullets. Yet ...

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Goodbye Sense – Welcome Alternatives?

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I only recently noticed that Sense, the Chrome Plugin for Elasticsearch has been pulled from the app store by its creator. There are quite strong opinions in this thread and I would like to have Sense as a Chrome plugin as well. But I am also totally fine with Elasticsearch as a company trying to monetize some of its products ...

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