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Author Archives: Oleg Varaksin

How to get JSON response from JSF?

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Many JavaScript widgets expect data and options in JSON format. Nowadays, it is really easy to choose a cool widget and wrap it in a composite component. But the first question is how to send an AJAX request and to recieve a response in a proper JSON format. This question is often raised by JSF users. All that you need ...

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How to implement a custom password strength indicator in JSF

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Verifying password strength using JavaScript is a common task. In this post, I will show how to add a password strength indicator to an JSF based web application. The password component in PrimeFaces already has a feedback indicator of the password strength, but it has two major shortcomings: Feedback indicator is not responsive (fix width, not mobile friendly, etc.) Rules ...

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Using more than one property file in Spring MVC

spring-interview-questions-answers

Everybody heard about portals which combine single web applications to a big one. A portal software works like mashups – content from several sources is picked up in a single service, mostly displayed in a single web page. A portal software also allows to change user settings, such as language or theme, across all single web applications (independent modules) embedded ...

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What is your structure of JEE based web projects?

java-interview-questions-answers

In this post I will try to discuss diverse organization structures of web based projects, mostly with JSF. The first thought when starting a new project is how to organize my Java packages? Imagine, you develop a web based user and group management system. A long time I used the following structure of Java packages which separates bean classes from ...

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Hot Deployment with IntelliJ IDEA

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Recently there was a voting in the PrimeFaces forum PrimeFaces IDE Poll for the best IDE used to develop PrimeFaces applications. The most people voted for NetBeans. NetBeans and Eclipse are free IDEs. My favorite IDE IntelliJ IDEA Ultimate is not free and I think this is a reason why there are less people using it on the job. I ...

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Simple and lightweight pool implementation

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Object pools are containers which contain a specified amount of objects. When an object is taken from the pool, it is not available in the pool until it is put back. Objects in the pool have a lifecycle: creation, validation, destroying, etc. A pool helps to manage available resources in a better way. There are many using examples. Especially in ...

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Monitor full page, non AJAX, requests to be notified

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Recently, working on new charts and chart “exporting service” in JSF, I’ve faced a quite common problem. When you execute a long-running task (action), you would like to show a status “Please wait …” dialog on start and close this dialog at the end, when the response arrives. This is not a problem for AJAX requests, but it is problematic ...

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Proper decoding of URL parameters on the server-side in JBoss

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I spent many hours today to figure out how to force a proper decoding of encoded characters in JSF applications running on JBoss (using JBoss 7 Final). The problem occurs when you have e.g. chinese characters passed through URL. Assume you have 指事, encoded as %E6%8C%87%E4%BA%8B. Surprise, but these characters arrive you on the server-side as 指事. They are decoded ...

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Multiple dynamic includes with one JSF tag

java-interview-questions-answers

Every JSF developer knows the ui:include and ui:param tags. You can include a facelet (XHTML file) and pass an object, which will be available in the included facelet, as follows:                 <ui:include src="/sections/columns.xhtml"> <ui:param name="columns" value="#{bean.columns}"/> </ui:include> So, you can e.g. use it within a PrimeFaces DataTable with dynamich columns (p:columns) <p:dataTable value="#{bean.entries}" ...

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