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HOW TO: Stereotyping a java Class

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In this HowTo post I will show how we can stereotype a class with another class. Why is this useful? When there are a lot of BCI’ing happening in your project, it is not prudent to let every developer write the BCI code. For one, this does not abstract the BCI library used. Thus changing the library itself becomes difficult. ...

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HOW-TO: Custom error pages in Tomcat with Spring MVC

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Default Tomcat error pages look scary. In addition, they may expose valuable information including server version and exception stack trace. Servlet specification provides a way to configure an exceptional behavior through web.xml. One can configure either reaction on a specific Java exception or to a selected Http response code(s). error-page element specifies a mapping between an error code or exception ...

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Stacktraces are telling the truth. But not the whole truth.

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Our company is all about making the cause of software errors transparent to developers and operations. As opposed to alternative solutions, we surface the location of the problem pointing you towards the malicious line in source code. Even though we are currently best known by our capabilities in detecting memory leaks, we are expanding into other areas as well. To ...

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Deep Stack Traces Can be a Sign for Good Code Quality

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The term “leaky abstractions” has been around for a while. Coining it is most often attributed to Joel Spolsky, who wrote this often-cited article about it. I’ve now stumbled upon another interpretation of a leaky abstraction, measured by the depth of a stack trace:               So, long stack traces are bad according to Geek ...

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Turning Assertions Into a Domain-Specific Language

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Assertions are an essential part of our unit tests. And yet, it so easy to neglect them. That is a shame because if we overlook the importance of assertions, the assert section of our tests becomes long and messy. Sadly, most tests which I have seen (and written) suffer from this problem. This blog post describes how we can get ...

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A JUnit Rule to Conditionally Ignore Tests

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I always believed that using @Ignore to deactivate tests is a bad idea. Except, maybe as one way to put tests that fail intermittently into quarantine to attend to them later (as Martin Fowler describes it here). This bears the danger that the test suite decays as more and more tests keep getting ignored and forgotten. Therefore you should have ...

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Provisioning Ubuntu With Java in 3 Steps

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As I’ve written about before, Vagrant is handy tool for creating localized VMs. It’s a lot like firing up EC2 images, but, for the most part, things are localized (you can, by the way, use Vagrant to fire up EC2 images). If you’ve ever used VMWare before, its the same thing, except Vagrant is free. You can create VMs of ...

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Grails Goodness: Generating Raw Output with Raw Codec

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Since Grails 2.3 all ${} expression output is automatically escaped on GSPs. This is very useful, because user input is now escaped and any HTML or JavaScript in the input value is escaped and not interpreted by the browser as HTML or JavaScript. This is done so our Grails application is protected from Cross Site Scripting (XSS) attacks. But sometimes ...

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