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Hibernate Statistics with Hawtio and Jolokia

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A huge part of enterprise Java deals with data. Among all the different ways of working with data in enterprise settings, there is still the proven and widely taught approach to use O/R mapping of any kind. The JPA standard makes this comparably easy to use for everybody and it should also be portable. But let’s not talk about migration ...

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Test Attribute #7 – Footprint

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When we talk footprint, we’re really talking about isolation. Isolation is key to trust. Wait, What? The “checking” part of testing, is really about trust. We check, because we want to make sure our system works as we anticipated. Therefore, we build a suite of tests that confirm our assumptions about the system. And every time we look at the ...

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Why I distrust wildcards and why we need them anyway

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In any programming language that combines subtype polymorphism (object orientation) with parametric polymorphism (generics), the question ofvariance arises. Suppose I have a list of strings, type List<String>. Can I pass that to a function which accepts List<Object>? Let’s start with this definition:             interface List<T> { void add(T element); Iterator<T> iterator(); ... } Broken covariance Intuitively, we might ...

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HawtIO on JBoss Wildfly 8.1

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HawtIO gives awesome eye candy to your JVM based middleware. It’s a unifying console for applications that would otherwise have to build out their own crappy web console; and let’s be honest, they’re all built differently, differing technology, different UX, and all around a terrible way to try to manage middleware in QA/PROD environments… I can hear the operations folks ...

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Top 10 Very Very VERY Important Topics to Discuss

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Some things are just very very very VERY very important. Such as John Cleese. The same is true for Whitespace:                 Yes. 1080 Reddit Karma points (so urgently needed!) in only 23 hours. That’s several orders of magnitudes better than any of our – what we wrongfully thought to be – very deep ...

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Code is NOT poetry, it is just code

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One can read in the footer of WordPress.org: Code is Poetry. This is quite a bold statement and whoever believes in that slogan, he would be made to think that some kind of extraordinary portion of code must reside in the WordPress repositories. I took the time to look at a random “quote” of the WordPress poem, i.e. a single ...

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Testing code for excessively large inputs

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When writing unit tests we mostly focus on business correctness. We do our best to exercise happy path and all edge cases. We sometimes microbenchmark and measure throughput. But one aspect that is often missed is how our code behaves when the input is excessively large? We test how we handle normal input files, malformed files, empty files, missing files… ...

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My Exprience using ElasticSearch NodeJS and ExpressJS

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General requirement Part of a system I am currently working on is manipulating raw data. The data being sent from multiple client devices (Android/Iphone devices, etc..) ~ 100,000 requests per day. The raw data needs to be collected and ready for later use. It gotta be searchable and aggregated for calculations. I had little experience with Solr but this time ...

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