Mar 12
10
Ceiling Space Utilization
This ceiling is not being used to its fullest potential
In even the most cluttered homes and businesses, ceilings are typically completely unused. You may not be able to pick a path to the door, but look up and you’ll see a vast expanse of smooth blank space. This seems like a waste of resources – you’re paying for a room bounded by walls, but you’re only getting value out of n-1 of them.
Jul 11
16
JRebel, JBoss, and EARs
ZeroTurnaround just released JRebel 4.0.2 (get it and a 30-day trial here). JRebel is a JVM plugin that works with a variety of classloaders. Its chief value proposition is reducing development time by dynamically reloading classes into the Java Virtual Machine as you make changes.
An article at The Server Side caught my eye and I started learning about the new features of JRebel. I had seen it when it was first launched – then called JavaRebel – and there weren’t enough features to make it worthwhile. Now JRebel has support for 35 frameworks and a number of servers, including Tomcat, JBoss, and Glassfish. In addition, there are IDE plugins for Eclipse, IntelliJ IDEA, and NetBeans.
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The Setup
As Valentine’s Day neared, our HR assistant popped in and told us about the office party she was planning, complete with a contest to see who could make the most awesome Valentine’s Day mailbox. “You guys have to participate!” she said. Thinking better of it, she amended, “But no fire allowed”.
Forced at HR-point, I thought this would be the perfect starter project for an Arduino board. I purchased the USB Boarduino (an Arduino clone) from Adafruit Industries for $25 and threw in a Passive Infra-Red motion sensor for $10. The Boarduino can be used just like an Arduino – you can use the same Arduino software, tutorials, libraries, etc.
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Seen this error message while using JAXB/Jersey?
com.sun.jersey.api.client.ClientHandlerException: A message body writer for Java type, class [...], and MIME media type, application/octet-stream, was not found
at com.sun.jersey.client.urlconnection.URLConnectionClientHandler.handle(
URLConnectionClientHandler.java:128)
It sounds like you need to create a message body writer for your post, right? While that may be the case, it can also mean something less sinister but much more hidden. In my case, I had simply forgotten to add the element declaration to the request object defined in my XSD.
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While developing a library that uses JAXB/XJC to generate Java classes from XSDs a problem came up: One customer was using the same process to generate Java classes for their project, and Adapter0.java, Adapter1.java, etc. generated and named by JAXB caused a conflict between the two conflicts. Here’s how I solved the problem.
JAXB/XJC generates some default adapter classes automatically and sticks them in a default package (org.w3c.something…). A new adapter class is created every time JAXB/XJC encounters a <javaType> tag in the XJB file. Each adapter class is named Adapterx.java, where x is the sequence number of the <javaType> tag. Hence, two JARs generated using JAXB/XJC can be in conflict because they each have a class named Adapterx in the same package.
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Dec 10
14
Build Status Indicator Stoplight
Who doesn’t want instant gratification in their work? Everyone likes to see progress. Knowing this, I decided to begin the Build Status Indicator project.
Finished stoplight build status indicator
Build status notification is a common problem for environments with periodic automated builds. When the build completes, relevant developers should be notified, right? There are many ways to solve this problem; most Continuous Integration (CI) tools support sending build status emails and some, like Hudson, include a build status RSS feed.
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