Automatically Accepting EULA while Installing Sun JDK on Ubuntu

Useful: http://ubuntuforums.org/showthread.php?t=953779&page=2

Profiling Java Application with Netbeans on Ubuntu

Currently this requires installing the "Java Profiler" plugin from within the IDE > Tools > Plugins. Then follow the same steps as for profiling in Windows.

Profiling Java Application with Netbeans on Windows

For profiling with netbeans, I followed the steps as described in the Netbeans IDE 6.8 under "Profile > Profile Project" and "Profile > Attach Profiler". At first, I created a new ant target as:


<target name="run-prof">

<exec dir="${deploy.dir}" executable="cmd" os="Windows 2003" output="runmaster.output.txt">

<env key="HOME" value="C:code">

</env>

<arg line="/c run.bat">

</arg>

</exec></target>


and then to attach the target to the profiler, I replaced the call to "run.bat" with a call to "run_nbproject.bat" as described under the "Attach Profiler" widget. I also set the filters to include "jboss.*".

Using JNI with JBoss

For using JNI with JBoss, it is necessary to put the JNI Java wrapper inside the deployment directory of the JBoss server.

I also used the following settings for JNI to work:

• set java.library.path to include the path to the .so file 
• set java.ext.dirs to include the path to the .jnilib file (not sure if this is needed)

I did not set the java.library.path variable directly. I wanted to append to this variable and could not find an easy way. Instead the LD_LIBRARY_PATH variable is appended by the JVM into java.library.path. I exploited this. I included the path to the .so in the LD_LIBARY_PATH.

Installing OpenCV for Java on Ubuntu 10.04

In this article I discuss how I set up OpenCV with Java on my Ubuntu 10.04. Primarily, I followed the process described at http://ubaa.net/shared/processing/opencv/ but with several changes (when I was stuck in the middle due to the old version used in the installation at the site). 

First, I installed OpenCV on Ubuntu using sudo apt-get install libcv-dev

Then, I put the openCV wrapper files known as "Processing OpenCV Library" from (this is the version that worked on my installation):

http://ubaa.net/shared/processing/opencv/download/2.0/beta/opencv-linux_2.0b.tar.gz

in a dir1 and then added to my JVM options java extensions directory as specified on the Processing page: -Djava.ext.dirs=dir1

I also had to install libcvaux-dev to resolve some link errors: sudo apt-get install libcvaux-dev.   

For the Face Detection to work, I had to set the cascade using OpenCV::cascade function before the OpenCV::detect call. After this, the example FaceDetection.java worked for me.

Sometime soon I needed the class file for PImage at run time. For this, I downloaded Processing from http://processing.org/download/processing-1.1.tgz. Then I put the directory containing core.jar (dir2) also in the java extensions setting above. That is,
-Djava.ext.dirs=dir1:dir2

Using Multiple Java versions

For building Katta, I needed to use Java 6 (compilation did not work with Java 1.5). Now I have two java versions installed on my dev laptop. To make use of Java 6, I just needed to set JAVA_HOME and PATH appropriately (export PATH=$JAVA_HOME/bin:$PATH) and then the compilation worked fine.