« Posts tagged Java

Manually override and launch quartz jobs…

January 20, 2011 / posted in Java / No Comments

Override quartz settings?

So you have a quartz job that’s chugging along nicely until you’re hit with the reality that the job details parameters change or the job needs to be suspended, or something happens that you end up having to recompile and redeploy your application just to update the packaged quartz job properties. This is no fun. You will undoubtedly have to take the updated code through the regular qa cycle, regress test, and then ultimately redeploy your code into the production environment. Surely there must be some way to address this problem when using Jboss…

One way…

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Apache XSL-FO’ sho v1.0

August 2, 2010 / posted in Java / No Comments

Transforming XML into PDFs.. and stuff

If you’ve ever been tasked with providing PDF documents via xsl, you’ve surely done some homework and shopped around for viable third party libraries. Some are good, some are great and rightly so charge a price, and some are just flat out incomplete or shanty in their documentation. It’s not a knock on anyone, its just a fact well known to open source developers. Historically what has been missing is an open standard for pdf generation, and possibly other output formats.

Enter XSL-FO: XSL Formatting Objects is an open standard for formatting documents in…

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Sardine powered webdav client?

July 28, 2010 / posted in Java / No Comments

Extra Sardines on my pizza please

A few days ago I came across the need for an easy to use webdav client. Currently we’re using jakarta slide, which as it turns out is a project that was discontinued (as of fall 2007!), and whose code base as of this writing is practically 10 years old. Who wants those jars collecting dust in their lib directories? Sure it works, but hey, I’m trying to keep up with the Jones’ here, I’d like an up-to-date library that hasn’t been discontinued.

Dismayed, I took a look a the replacement suggested…

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Sending Attachments with the Javamail 1.4.x API

July 25, 2010 / posted in Java / No Comments

Make your emails interesting with attachments!

Not that your emails aren’t already interesting – if you have some kind of regular job running and you want to produce a results bound file sent to your recipients as an attachment, this code example can illustrate one way it can be done. It’s pretty much the same thing as sending a regular email except that it uses multipart attachments as the body content of the message:

package com.faceroller.mail;

public class Mailer {

	private static final Log log = LogFactory.getLog(Mailer.class);

	public static void send(Email email)
			throws MessagingException, NamingException, IOException {

…

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Integrating Spring MVC 3.0 with JSR 303 (aka javax.validation.*)

February 8, 2010 / posted in Java / 39 Comments

Annotated POJO validation comes to a JDK near you!

The new annotated validation spec (jsr 303) is pretty slick, especially when used along side Spring MVC 3.0, and when backed by ejb3 entities. I’m pretty impressed with how easily it integrates with Spring MVC’s framework, and with how seamlessly error messages are passed to the form taglibs so they show up in your web forms.

I know some of you might argue that the current validation framework might not address complex validations, but after giving Hibernate’s reference implementation documentation a look, it seems interdependent validations are at least…

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Quartz Scheduled Jobs – v1.5.2

February 5, 2010 / posted in Java / 7 Comments

Java, XML, and cron driven scheduling made easy.

Projects here and there often need some kind of mechanism to schedule jobs at odd hours, or intervals. Quartz is a robust, flexible tool you can use to accomplish simple to complex job scheduling. There are a number of ways to use/configure quartz, but I’ve grown accustomed to using it with an xml based configuration. There are a few things we need to set up unfortunately, so there is a certain amount of plumbing we need to work out, but once that infrastructure is set up, its much less work…

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Ejb3 Basics: Deploying Message Driven Beans

February 2, 2010 / posted in Java, Jboss / 2 Comments

Farewell to lazy auto queue generation in JBoss 5

MDB’s were never so easy to deploy and manage when ejb3 first came out. In Jboss 4, all you have to do was annotate a class with @MessageDriven, sprinkle some meta data here and there, stick it in the oven and wham! Instant “I cant believe I made an MDB!?!” In Jboss AS 5 however, MDB queues are no longer automatically created for your application anymore on boot. An inspection of the MDB llifecycle illustrates why:

  1. MDB deploys
  2. No existing Topic/Queue
  3. Topic/Queue is automatically created
  4. MDB is

…

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Ejb3 basics: Entities

January 29, 2010 / posted in Java / No Comments

Entity Beans? Better than 2.1, I promise.

Ejb3 Entity beans are a type of enterprise java bean construct used to model data used by the ejb framework. The basic idea is to manipulate simple java objects, which represent in concrete terms your database data, and then have the framework handle as much of the plumbing as possible when you persist the data. Persisting means to store for later use in some data repository – usually some kind of database. By persisting these entities within the ejb framework we are able to abstract out tasks like updating a table and its…

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XML, Xalan, Endorsed dirs and &..

January 28, 2010 / posted in Jboss, Technobable / 3 Comments

So recently, we’ve been working on a project that makes use of OpenSAML. As it turns out OpenSAML required newer Xalan libraries (2.7.1 to be precise), the kind that don’t ship with the older incarnation of jboss we are using for the project – version 4.02. Some of you might be more familiar with the jboss system properties and will know there’s a property jboss used specifically to override the standard xml libraries that ship with the jdk/jre (entry in the console output bolded and marked with a *). Jboss will allow you to pass in…

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War deployment file structure

January 25, 2010 / posted in Java, Jboss / 1 Comment

What’s a war deployment, do I need my own army?

When it comes to deploying an web based application we have a few options on the table. Well only one really if you stick to J2EE standards, not counting Ear deployments which also deploy web apps via wars. Outside the world of J2EE though, it becomes a crap shoot based on the web framework you’re using. So what’s a war look like?

webapp.war
	|-- images/
	|   `-- banner.jpg
	|-- index.html
	|-- jsps/
	|   |-- public/
	|   |   `-- login.jsp
	|   `-- private/
	|       |-- application.jsp
	|

…

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