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Author Archives: Gerard Davison

JSON-Schema generation in Jersey

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

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

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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Changing delay, and hence the order, in a DelayQueue

So I was looking at building a simple object cache that expires the objects after a given time. The obvious mechanism for this is the use the DelayedQueue class from the concurrency package in Java; but I wanted to know if it way possible to update the delay after an object has been added to the queue. Looking at the ...

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Catch a StackOverFlowError by it’s tail

One of the more annoying situations you might have to deal with when working with a Java program is a StackOverFlowError, if you have a nice producible test case then there are few options with regard to playing with the stack size, or setting a conditional breakpoint / trace of some kind. But if you have a test case that ...

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