Fix Nvidia card resolution problem in Ubuntu (works in 9.10 too)

Sometimes the nvidia x server fails to recognize all the resolution combinations. This is how you fix it: 

Add Option "ModeValidation" "AllowNon60HzDFPModes, NoVertRefreshCheck, NoEdidMaxPClkCheck, NoHorizSyncCheck"

Under device section in the xorg.conf in /etc/X11/xorg.conf

Source: http://ubuntuforums.org/showthread.php?t=444960

JSTL taglib declaration reminder

Watch out for what specific JSTL version you're taglib-ing in your JSP's
If you put <%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %> and perform a basic <c:forEach> (you know... with attributes "var" for indexing and "items" for specifying the collection to loop) you might get a dumb error like this:

org.apache.jasper.JasperException: /index.jsp(65,0) According to TLD or attribute directive in tag file, attribute items does not accept any expressions
	org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)
	org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)
	org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:148)
	org.apache.jasper.compiler.Validator$ValidateVisitor.checkXmlAttributes(Validator.java:1174)
	org.apache.jasper.compiler.Validator$ValidateVisitor.visit(Validator.java:821)
	org.apache.jasper.compiler.Node$CustomTag.accept(Node.java:1530)
	org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2361)
	org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2411)
	org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2417)
	org.apache.jasper.compiler.Node$Root.accept(Node.java:495)
	org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2361)
	org.apache.jasper.compiler.Validator.validateExDirectives(Validator.java:1736)
	org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:183)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:332)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:312)
	org.apache.jasper.compiler.Compiler.compile(Compiler.java:299)
	org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:586)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:717)

WTF ? you can't do a <c:forEach> without an "items" ... I've googled around and found out that you must include an updated JSTL version in your taglib i.e. <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> for it to work. Reason for this error is version incompatibility between JSP, Servlet and JSTL. Matching versions are listed below.

• JSP 1.2 , Servlet 2.3 , JSTL 1.0
  
• JSP 2.0 , Servlet 2.4 , JSTL 1.1

"Un taran la Bucuresti tot taran cauta" - Marin Preda

Groovy & Grails for Java

Some cool and easy tutorials of Groovy and Grails written in Eclipse IDE
Groovy tutorial: http://www.vogella.de/articles/Groovy/article.html
Grails tutorial: http://www.vogella.de/articles/Grails/article.html

have fun

Disable Your PC Speaker in Ubuntu

You know that annoying, shrill beep that comes not from your speakers, but rather inside the depths of your computer called a system beep? I hate it, but Ubuntu likes to use it when, for example, I'm searching for text in Firefox and I get to the point where the text doesn't match anything. In Windows, this invokes a fairly annoying noise. In Ubuntu, it's the system beep, which is even worse. Here's how to disable it:

Stop it for now by doing the following:

sudo modprobe -r pcspkr

Stop it forever by blacklisting the module.  Edit /etc/modprobe.d/blacklist and add this line:

blacklist pcspkr

That's it

Ubuntu screen resolution problem

It happens from time to time that ubuntu doesn't recognize multiple screen resolutions in my Nvidia x server settings so i'm stuck with 1024x768 (excuuuse me for wanting more from my Nvidia 9800 card). This problem suddenly appears and disappears randomly after a certain number of reboots. A solution i found is to use the following command and then reboot (you will have to reconfigure the Nvidia x server again using "sudo nvidia-xconfig"

sudo dpkg-reconfigure xserver-xorg