In the last blog post I introduced what is the OWNER API and how to use it. Basically it is tiny library that helps reducing the Java code to read the configuration for your application from Java Properties files. You can find full documentation here. Version 1.0.0 was having the very basic features, and now I’m […]

If you don’t know Project Honey Pot, go and have a look. They offer a service for querying IP addresses and check if they are listed in those involving in spamming or threatening activities. So, if your visitor has a black listed IP you can block him from accessing or doing something sensitive. Since it […]

Self executing jar files

I personally always felt bad about the fact that we have to provide a shell script which runs the executable jar file. It would be nice if we could provide a self contained executable in a single file, right? I just discovered a trick which works on unix, but it can possibly be adapted on […]

Another funny video I found around.

I/O Exception handling

I very much prefer this approach: OutputStream out = new MyOutputStream(…); //may throw IOException try { //use the stream } finally { out.close(); } than this: OutputStream out = null; try { out = new MyOutputStream(…); //may throw IOException //use the stream } finally { if (out != null) { out.close(); } } I just […]

When I first had to use OS X I had hard time with some things that weren’t working as expected. I thought they were usability bugs, but of course don’t try to argue about that with a veteran Apple user, because “you’re ugly and stupid, and that’s the way it should be! And OSX has […]

Are you habit to have some configuration files packaged inside the jar of your application? If so, you can still have a look at those configuration files in the running environment using the unzip Unix utility. $ unzip -p /opt/myapp/lib/my-app.jar log4j.properties log4j.rootLogger=INFO,stdout log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.Threshold=INFO log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%d{dd-MMM hh:mm} [%-5p] %m%n The -p option uncompress and prints […]

I wrote in a previous article how easy it is to translate Java object to/from XML, without adding exotic library dependencies to your project; recently I’ve going through the code of one of my colleague and I discovered that the 3 line necessary to marshal and un-marshal the XML can be shortened to a single […]

Eclipse Save Actions

I recently started to use a feature in Eclipse 3.6.1 that I didn’t notice before: the “Save Actions”. Basically you can configure some actions that will be done automatically when you save a Java source. Some of them are really useful, like Organizing the imports, adding ‘final’ to private member instances, etc. Here the screen-shot […]

Just discovered an interesting bug in Java interpreter and compiler, that makes them hang when converting the value 2.2250738585072012e-308. Nice to know. The bug has been reported to Oracle, but I supposed they will include this in their collection of bugs and sell it as “Oracle Database 12g” product. :-)




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