Home » Author Archives: Gerard Davison (page 2)

Author Archives: Gerard Davison

Post-hoc tracing using a debugger

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Once nice little features of most debuggers that I have been exercising recently is the ability to log information on a breakpoint. This can be a really useful was to understand code without having to modify it is involve byte code modification. Let’s consider this very trivial and inefficient implementation of a function to return the n’th number in the ...

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Lambda, will it serialize?

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So I have been ponder an enhancement required on the Tyrus project that would allow a user to broadcast to a subset of client connected to a URL across a cluster of machines. There are various way of doing this; but since I was playing with JDK 8 this problem definitely looked like a nail.   To this end I ...

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Write an auto-debugger to catch Exceptions during test execution

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Previously I have stated that there are some exceptions you would always want to keep an debugger breakpoint on for. This help prevents code rotting away without you noticing – sometimes masking a different problem. If you take this seriously then it is a good idea to extend this idea to you automated testing; but coming up with a comprehensive ...

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Almost named method arguments in JDK 8

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Sometimes it would be really nice to have named method parameter in Java, this doesn’t look likely for a long while but there is always another little work around, for example using a builder pattern to get similar behaviour, that will bridge the gap for a little bit. It occurred to me that using the Lambda support in JDK 8 ...

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Off-loading your test execution using Hudson

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One of the annoyances if you have a load of tests for a particular project is that running them can tie up your machine for a while. There are also sometimes consistency issues when running on different machines with different window managers and operating system versions. One thing we do is for every main hudson job we create a copy ...

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JSON-Schema generation in Jersey

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So in my previous post I talked about a proposal to allow the use of JSON-Schema in a WADL, this post looks at how to get this working with a recently build of Jersey. You are going to have to download / reference 1.16SNAPSHOT until 1.16 is released. If you are using Maven this should be quite straight forward to update ...

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JSON-Schema in WADL

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In between other jobs I have been recently been reviewing the WADL specification with a view to fixing some documentation problems with a view to producing an updated version. One of the things that because apparent was the lack of any grammar support for languages other than XML – yes you can use a mapping from JSON<->XML Schema but this ...

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Using Hudson/Jenkins to diagnose that intermittent failure

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I have been working on one of those intermittent bugs that just won’t reproduce on my machine; but will reproduce intermittently on other machines while they are running automated testing. I filled the code with trace statements, now I suspect the problem is in code that I don’t control and doesn’t appear to have much in the way of diagnostics ...

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