Recent Notes
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Created by Fang on February 08, 2012 21:21:01
Last update: February 08, 2012 21:21:17
Just a reminder that I got this error when I set the Java system property javax.net.ssl.trustStore to a non-existing file (typo). The full error message when running Maven was:
[ERROR] java.lang.RuntimeException: Unexpected e...
Created by Dr. Xi on February 07, 2012 15:40:11
Last update: February 07, 2012 15:40:11
An alias defined in .profile does not work when you open a bash window from the desktop. Simply put, alias should be put in .bashrc ; PATH should be put in .profile . These are the facts: .profile is executed by the login shell, i.e., when you login. .bashrc is executed whenever a bash shell is opened - login or non-login. When you open a new bash window from the desktop, a non-login shell is created, it will execute .bashrc , not .profile . When you ssh to a remote system interactively, a login shell is created. When you ssh to a remote system and run a command directly, a non-login shell is created. PATH modifications should be put in .profile since it is usually...
Created by Dr. Xi on February 06, 2012 09:20:20
Last update: February 06, 2012 09:20:20
This is the error message:
Error 6 initializing SQL*Plus
SP2-0667: Message...
It might be that the ORACLE_HOME environment variable is not properly set or a missing sp1<lang>.msb (for example sp1us.msb ) file. But for my Ubuntu system, there was no such thing as sp1<lang>.msb , and it wasn't caused by a missing ORACLE_HOME . The error was resolved after I restored the shared library file libsqlplusic.so .
Created by James on January 11, 2011 22:08:26
Last update: February 03, 2012 11:23:25
By default Firefox puts a dotted line box around the link or button label when you click them. Sometimes it's annoying and makes your sexy buttons look ugly. You can get rid of the dotted lines for links with outline:none in CSS, but that doesn't work for buttons.
<!doctype html>
<html>
<head>
<style t...
For buttons you need " button::-moz-focus-inner { border: 0; } ":
<!doctype html>
<html>
<head>
<style t...
I've also seen this:
/* get rid of those system borders being generated...
For more information :
Remove Button Focus Outline Using CSS
Created by timo on January 25, 2012 20:13:13
Last update: January 25, 2012 20:13:13
The MIPS CPU is able to run both big-endian and little-endian. So a system built on MIPS can be either big-endian (mips) or little-endian (mipsel).
The file command shows the architecture:
$ file ls
ls: ELF 32-bit LSB executable, MIPS, ...
but readelf will tell the endianness:
$ readelf -h ls
ELF Header:
Magic: 7f 45...
Created by Dr. Xi on January 06, 2012 14:02:09
Last update: January 06, 2012 14:02:09
In Java, the OS temporary directory is identified by the system property java.io.tmpdir :
public class TmpDir {
public static void ma...
Created by zhidao on January 02, 2012 15:17:43
Last update: January 03, 2012 07:18:15
SCIM is needed to input Chinese in Ubuntu.
Install the needed packages:
$ sudo apt-get install scim-qtimm im-switch scim-p...
Goto "System Settings": click the "gear" icon at top right corner and select "System Settings..."
Click "Language Support"
Select scim for "Keyboard input method system"
Log out and log back in.
Switch between input methods with CTRL+Space
A list of available input methods is available from: http://www.scim-im.org/projects/imengines
Created by nogeek on December 30, 2011 13:25:28
Last update: December 30, 2011 13:57:37
By default, tomcat uses an enhanced java.util.logging implementation called JULI, which can be configured at two different levels: Globally, with the ${catalina.base}/conf/logging.properties file. Per web application, with WEB-INF/classes/logging.properties . The configuration file is a normal Java properties file: Logging handlers are specified with the handlers property.
handlers = 1catalina.org.apache.juli.FileHandler, ... The root logger can define its set of handlers using the .handlers property. .handlers = 1catalina.org.apache.juli.FileHandler,... A prefix may be added to handler names. The prefix starts with a digit and ends with a dot ( . ), for example: # 1catalina. is a prefix 1catalina.org.apache.j... System property replacement is performed for property values which contain ${systemPropertyName} . Each handler can have its own specific properties: 3manager.org.apache.juli.FileHandler.level = FINE ... Loggers can define their own...
Created by nogeek on December 30, 2011 13:54:04
Last update: December 30, 2011 13:54:04
Tomcat 7.0 failed with a SEVERE error without printing a stack trace:
Dec 30, 2011 1:21:09 PM org.apache.catalina.core.S...
Now it's hard to figure out what's wrong without knowing where things went wrong. Why is Tomcat not logging anything?
Tomcat logging is configured by class loader. Logging behaves differently depending on which class loader loaded the logger. You'll need to look at both $CATALINA_BASE/conf/logging.properties and WEB-INF/classes/logging.properties to figure out why the stack trace is not logged.
In my case, the web app specific WEB-INF/classes/logging.properties overshadowed the system $CATALINA_BASE/conf/logging.properties and suppressed the stack trace.
Created by Fang on December 09, 2011 11:50:28
Last update: December 09, 2011 11:51:34
Values of Maven properties are accessed with the construct ${...} . Properties come from 5 different sources:
From the environment, for example: ${env.PATH} , ${env.JAVA_HOME} .
From the POM, in the form of ${project.x} . For example: ${project.version} , ${project.groupId} .
From settings.xml , in the form of ${settings.x} . For example: ${settings.offline} , ${settings.interactiveMode} .
From Java system properties, for example: ${java.home} .
Defined within the properties element in the POM. For example ( gae.version ):
<properties>
<gae.version>1.4.2</gae.ve...
