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Entries for the ‘Java’ Category

OpenSSL Certificate Formats / Conversion

Sep.15, 2009 in Java, Security Comments Off

This past week has left me having to learn much more about https certificates then I ever thought I would care to know…   Here’s a synopsis of some of the highlights of my learnings as pulled from various resources on the web.
OpenSSL supports several certificate formats. Certificates are based on the DSA signature algorithm and [...]

Tags: certificate, SSL

Create a default ‘usage’ target for your ANT project builds

Aug.14, 2009 in Build Automation, Java Comments Off

I keep coming across instances of ant build files where developers have hard coded a usage target that outputs target actions.  This is not required and should be avoided as it is often not maintained.  Instead, properly maintain the description attribute of each target and use a default target as below:  

<project name=”foo” basedir=”.” default=”usage”>

…

<target name=”usage”>
        [...]

MaxPermSize and how it relates to the overall heap

Jul.16, 2009 in Java, Programming Comments Off

Grails application throwing OutOfMemory error and PermGen space was exceeeded errors… Looks like grails applications require a fairly large permgen space… Here’s a useful  article on how to address this.

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Tags: Java, Memory

Returning raw XML string from Oracle XDB within Groovy / Grails

Jul.13, 2009 in Databases, Java, Oracle Comments Off

Here’s a quick solution for trying to extract the raw xml string from an Oracle XDB database when working with Grails.
After an initial attempt to hardcode a hibernate query to return the raw sql using .getStringVal() as follows:
SELECT x.id, x.xmlData xmldata.getStringVal(), lines.*
FROM xml_requests x
XMLTable(‘declare [...]

Tags: Grails, Groovy, Oracle, XMLDB

Tips for dealing with javac OutOfMemoryError

Jun.12, 2009 in Java, Programming Comments Off

When javac is compiling a large number of java source files, it may fail with java.lang.OutOfMemoryError:
The system is out of resources.Consult the following stack trace for details.java.lang.OutOfMemoryError: Java heap space
It’s no different than OutOfMemoryError in other java applications. When you run javac in Sun JDK, it’s invoking com.sun.tools.javac.main.Main located in %JAVA_HOME%\lib\tools.jar.
If you are compiling with [...]

Tags: Java, Memory

Changing Header Class (CSS) in JSF Datatables

May.05, 2008 in JSF, Java Comments Off

Something I have always found annoying about JSF datatables is the limitation to only apply one header class style to the entire table. This is un-functional for datatables that would display monetary amount or other data that is typically right aligned whereas descriptive columns are left aligned. The table doesn’t look very nice [...]

Tags: CSS, JSF

Intercepting JUnit Assertion Error

May.03, 2007 in Java Comments Off

There have been times where I’ve had the need to perform some custom code when a JUnit test failure occurs. A simple way to handle this would be to catch Throwable do you logic and then re-throw the exception.
Not the most elegant of solutions.. but works nonetheless. Heres an example using the selenium rc [...]

Logging (Log4J/Jakarta Commons) Config

Jun.30, 2005 in Java, Programming Comments Off

The Jakarta Commons Logging package is an ultra-thin bridge between different logging libraries. Components may use the Commons Logging API to remove compile-time and run-time dependencies on any particular logging package, and contributors may write Log implementations for the library of their choice.
Levels To Use
The six logging levels provided by the commons logging API and [...]

  
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