Job not executing on Jenkins with the Docker plugin


Jenkins is one of my favourite tools. Docker is in that league too. Putting them together will really leverage the strengh of both tools. The Docker plugin can do that for you. This plugin can run a Docker container as a Jenkins slave on your Docker host. If the job on the slave is done, the container will be removed automatically.

However when running it on one particular Jenkins instance, it did not work! The slave was created, but somehow the job was not executed and stayed in the queue. On other Jenkins instances it did work. What was going on? After a while i figured it out. The job used for testing, was not a freestyle job. I used a multiconfiguration job accidently. After changing the job to a freestyle job, it worked like a charm!

J2tail 1.0 is just another tail application


J2tail is just another tail application. The main difference is: it is a web application. So it runs on a J2EE server (p.e. Apache Tomcat). This enables developers, system administrators, users, etc to ‘tail’ log files from their browser with great ease. Users do not need to have direct access to the file system of the J2EE server to access the log files. This is one of the great benefits of J2tail.

J2tail was build with ease in mind. It is easy to install, configure and use!

More information and downloads

Powerful filtering on collections in Flex

Adobe AIRAdobe Flex

People search for things all the time. It is in our genes and we use tools to achieve our goals. On the internet a lot of us use Google to find what we need. So most of us are familiar with Google search techniques. Now some of these search techniques are put into a very powerful filter function for Flex.

The features supported

This filter has an ignore list too. If you add words to it, you can make it even more Google search like. For example Google ignores words like “a” or “the” to help their users in their quest for information.

Of course you do not have to use features like the ignore list, the synonyms and the case sensitive option. If you do not use these features you still have a very powerful filter that’s easy to implement. A nice feature to extend this filter with in your application would be to allow the user to select the columns to search in. This column selection is not in the demo application, but my guess is you are perfectly capable to do it yourself.

The source

The only code shown is the code of the demo application, but you can download the full source. The other code is not put on the page, because it are too many files to put on a webpage. Do not let this scare you, because it is not that much or that complicated.

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx=""
			   width="400" height="265">
		import mx.collections.ArrayCollection;
		import nl.vanhulzenonline.collections.filter.Evaluator;
		import nl.vanhulzenonline.demo.Album;
		import spark.components.gridClasses.GridColumn;
		private var _collection:ArrayCollection;
		private var _evaluator:Evaluator = new Evaluator();
		private function creationCompleted(event:FlexEvent):void
			_collection = Album.collection;
			_collection.filterFunction = filterCollection;
			_evaluator.synonyms["four"] = new ArrayCollection(["4"]);
			grid.dataProvider = _collection;
		private function filterChanged(event:Event):void
		private function update():void
			formula.text = (_evaluator.tree) ? _evaluator.tree.toString() : "";
		private function filterCollection(data:Object):Boolean
			var labels:ArrayCollection = new ArrayCollection();
			for (var i:int; i < grid.columns.length; i++)
				  (grid.columns.getItemAt(i) as GridColumn).itemToLabel(data));
			return _evaluator.evaluate(labels);
		private function caseSensitiveFilterChanged(event:FlexEvent):void
			_evaluator.caseSensitive = caseSensitiveFilter.selected;
	<s:VGroup left="5" right="5" bottom="5" top="5" >
		<s:TextInput id="filter" width="100%" change="filterChanged(event)" />
		<s:CheckBox id="caseSensitiveFilter" label="filter case sensitive" 
			valueCommit="caseSensitiveFilterChanged(event)" />
		<s:DataGrid id="grid" width="100%"  height="100%" >
		<s:Label id="formula" />

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