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The HTML5 working draft describes different techniques to push information from a server to the client and the one described in this tutorial are Server-Send Events (SSE). Using Server-Send-Events eliminates the need to poll a server periodically for information using AJAX and is really easy to implement because of the simple specification and the fact that nearly all modern browsers already implement this specification. The Client Side Registering for Server Send Events (SSE) is quite easy .. simply create a new EventSource object that is bound to the URL where the events are propagated. ...

In Lucene 4.x there is an API to fetch index statistics for specific document’s fields. The following examples shows how to create an index with some random documents and fetch some statistics for a field afterwards .. Lucene Dependencies Just one dependency needed here .. lucene-core. I’ve added the declarations needed for Maven and SBT here .. if you’re using Gradle or Buildr you should’t have a problem to create your build file either.. ...

The latest snippet from my Lucene examples demonstrates how to achieve a facet search using the Lucene 4.0 API and how easy it is to define multiple category paths to aggregate search results for different possible facets. In the following example we’re indexing some books as a classical example and create multiple category paths for author, publication date and category afterwards .. Lucene Dependencies We simply need two dependencies here .. lucene-core of course and in addition the lucene-facet library .. I’ve added the declarations needed for Maven and SBT here .. if you’re using Gradle or Buildr you should’t have a problem to transfer the information needed ;) ...

Recently after a long sprint planning meeting I had the pleasure to spend some time writing down the results of the team’s task breakdown in JIRA. In our process, each user story is documented as a JIRA issue and each task from the breakdown is saved as a subtask for the parent issue. Because I am too lazy in this situation I wrote the following plugin that allowed me to quickly create multiple subtasks for a selected JIRA issue. ...

Figure 1. Pirate-Ninja-Unicorn Logo Happy news for us, Theresa and I we’ve won the Atlassian Codegeist Competition 2012 with our Stash Readme Parser Plugin in the category: Best Stash Plugin. We had two other plugins in the game, the Stash QR Code Plugin and the HTTP Request Workflow Function for Jira If you’re interested please take a look at the plugins in the Atlassian Marketplace our funny looking Pirate Ninja Unicorn Website or the project’s overview in my blog. ...

Often in the life of a developer there is the need to create a windows executable for a Java application that is build and packaged in a Jar file. The following short example shows how to create an executable Jar first and a windows executable containing vendor information, a nice icon and other stuff afterwards by using a combination of the Maven Shade Plugin and the launch4j Plugin for Maven. ...

Some funny stuff can be done using HTML 5, canvas elements and the video events API. In the following example we’re using these techniques to apply graphic effects to a video embedded in a HTML page.. The Goal Please take a look at the following screencast on YouTube to get an idea of what the final example looks like or just take a look at the demo page. As you can see a video is rendered and a clone is displayed with a strange swirl effect applied. ...

Having written some e-mail handling, sending or receiving library you’d like to run some integration tests against a real mail server? Then GreenMail might help you out here .. the framework is not quite new on the market but it is really easy to setup IMAP,SMTP or POP3 services with it and it comes with some helpful libraries making your life a bit easier here. That’s why I’ve come to the idea to share some examples for setting up different server instances, creating user accounts and – at last – fetching and validating e-mails… ...

Functional programming is a trending topic these days and a lot of Java programmers are hot for the features that modern functional programming languages might offer. Waiting for Java 8 and native closure support is a nice thing but for now we’re going to take a look at several Java frameworks that are trying to implement typical structures from those functional languages where possible using the capabilities of the Java language to emulate elements like higher-order-functions, closures, options and others … ...

Creating cronjobs or scheduled service executions is made really easy in Java EE 6. Scheduled tasks may be created in a programmatic style or simply by adding some annotations to an EJB. In the following tutorial we’re creating some simple scheduled tasks and let them run on an embedded GlassFish instance using the Maven Embedded GlassFish plugin.. Java EE 6 Maven Project from Archetype First of all we’re creating a new maven-ized project using one of the appropriate jee6 Maven archetypes ...