Monthly Archives: November 2008

Install and Use PMD plugin on NetBeans 6.5

There are more than few tools that help us maintain the code we write correct and working. We can divide them in source code and class file analyzers.

One of them is PMD, tools that is actively developed since year 2000. It is mature and provides integration with all important IDEs. On the PMD website, developers say that PMD checks:

  • Possible bugs – empty try/catch/finally/switch statements
  • Dead code – unused local variables, parameters and private methods
  • Suboptimal code – wasteful String/StringBuffer usage
  • Overcomplicated expressions – unnecessary if statements, for loops that could be while loops
  • Duplicate code – copied/pasted code means copied/pasted bugs

In this article we will show how it can be installed and used in NetBeans 6.5.

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Como instalar NetBeans 6.5 en Ubuntu / Linux

Netbeans 6.5 es recién publicado. Por suerte, existe un instalador por Linux y aquí voy a mostrar como funciona:

Por descargar instalacion de NetBeans, haz un click sobre:

Por asegurarse que archivo esta descargado correctamente y que su contenido es original, puedes calcular su suma verificadora md5 y comparara con valor del sitio de NetBeans:


Para poder ejecutar el archivo, abre una linea de comandos y en la carpeta donde está el archivo ingresa comando:

chmod +x

y despues podemos ejecutarlo:

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Installing and using Code Coverage plugin in NetBeans 6.5

One of techniques to ensure that software is properly and thoroughly tested is to get code coverage information and find which blocks of code weren’t executed at all.

There is a number of code coverage tools for Java applications. One of them, free and mature is Emma ( ) which is one used by NetBeans code coverage plugin.

Installing plugin

To install plugin, select Tools -> Plugins and choose “Code Coverage” in the list of available plugins:


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Installing NetBeans on Ubuntu – official way (updated)

There is NetBeans package in Ubuntu repositories. The official and supported way is to install it using apt. In that case, NetBeans will be updated automatically.

Problem with this approach is that current NetBeans package is not the last one. On November 23rd 2008 it was version 6.01. In case that you need newer package, follow procedure described in Installing NetBeans 6.5 on Linux / Ubuntu.

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Adding Sybase JDBC driver to NetBeans 6.5

NetBeans 6.5 includes JDBC drivers for Postgresql and Mysql, two most popular opensource databases. Database integration in NetBeans is done is such way that it is possible to create database connection and use it in built-in SQL client or JPA modelling/programming.

In order to use databases more common in enterprise world, we need to add a JDBC driver to NetBeans.

In this example we will add and configure Sybase database connection.

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Installing Netbeans 6.5 on Linux – Ubuntu

Note: Recently released Ubuntu 9.04 has NetBeans 6.5 in its repositories. Read how to install it in Update – Installing NetBeans 6.5 on Ubuntu 9.04.

Another note: This article is also available in Spanish: Como instalar NetBeans en Ubuntu

NetBeans 6.5 is just out. There is a Linux installer for it and I will show in few steps how it works:

To download installation, click here:

To ensure that download was successfull and that archive is not tampered with, you can calculate md5 checksum and compare the value with one from the NetBeans’ website:


To make downloaded archive executable open shell and in the directory where the file is type:

chmod +x

and after that execute it:

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