Oracle XE 11gR2 installation – “OracleXEService should not be installed already”

A simple guide on how to resolve Oracle XE 11gR2 installation failure. This error occurs when you are trying to install Oracle XE after successful un-install from Windows Control Panel.

Oracle XE 11gR2 installation – “OracleXEService should not be installed already”

Just make sure that Command Prompt is started using "Run as Administrator" 

Eclipse Xquery plugin and editor

XQuery Development Tools Installation  provides simple instructions to install XQDT and Zorba Xquery adapter.

In summary, you need to add the remote site http://download.eclipse.org/webtools/incubator/repository/xquery/milestones/ and install XQDT Core Features .

If your are using Eclipse 3.8 Juno or above, Cannot Install XQDT in Eclipse Error may occur.

Cannot complete the install because one or more required items could not be found.
  Software being installed: XQuery Development Tools Feature 0.8.0.201107251305 (org.eclipse.wst.xquery.feature.feature.group 0.8.0.201107251305)
  Missing requirement: XQDT Core Plug-in 0.8.0.201107251305 (org.eclipse.wst.xquery.core 0.8.0.201107251305) requires 'bundle org.eclipse.dltk.core [3.0.0,4.0.0)' but it could not be found
  Cannot satisfy dependency:
    From: XQuery Development Tools Feature 0.8.0.201107251305 (org.eclipse.wst.xquery.feature.feature.group 0.8.0.201107251305)
To: org.eclipse.wst.xquery.core [0.8.0.201107251305]

In order to overcome this issue, as suggested in the stackoverflow answer, install DLTK 3.0.0 from Eclipse Indigo update site - http://download.eclipse.org/releases/indigo.

You can also consider installing from DLTK Downloads directly any DLTK version that is greater than or equal to 3.0.0 but less than 4.0.0.

Java ClassNotFoundException and NoClassDefFoundError

These responses http://stackoverflow.com/a/3198490/37144 and  http://stackoverflow.com/a/2213496/37144  do not have many up votes but in my opinion they are the best ones.

A very useful tool used for locating class files - JarScan. It has an online version and offline version that can be used for searching local file system. However, the online version's database isn't too big and might not auit everyone'e requirement. For that, one can visit findJar

Play Videos on HP TouchPad

Or Free media player for HP TouchPad.

Before I talk about the free option. Let me just say that by far the best media player on HP TouchPad is available at KalemSoft. It costs $4.99 at the time of this writing.

The best free alternative at the time of this writing is TouchPlayer. All the required instructions to install it are available at the same location.

HP TouchPad WebOS Preware Installation

Why Preware?
WebOS Quick Install can be used to install Apps using .ipk files onto the TouchPad that are not part of HP Catalog. There are 2 main disadvantages -

• The device needs to be always connected another laptop/desktop.
• If an app has dependencies on any other app that are not already installed, the .ipk may not install successfully.

Install Preware

The latest version of Preware installer ipk can be found Preware Downloads. Install it using WebOS Quick Install just like any other app.

On successful installation, Preware icon can be found in the Downloads tab of HP TouchPad Launcher.

TODO: TouchPad Downloads tab screenshot here


References : http://www.webosbuzz.com/hp-touchpad/633-how-install-preware-onto-hp-touchpad.html

WebOS Quick Install

WebOS Quick Install can be used to install applications not included in the official HP Catalog. It can be used for HP TouchPad or any other WebOS devices. WebOS Quick Install is developed by Jason Robitaille. The latest version of WebOS Quick Install along with the installation requirements and instructions can be found here.


Before launching WebOS Quick Install, the device needs to be connected to the laptop/desktop via USB cable in Developer Mode.

Activate Develop Mode in HP TouchPad

Turn on your Touchpad and press the home button. Tap the "just type" area and enter webos20090606. 

Tap the "Developer Mode" icon that appears. Tap the "on/off" slider in the top right corner of the next screen, but leave the "DEVELOPER MODE PASSWORD" field blank. Tap "Submit".

TODO: Screenshot of Dev Mode Window

Launch WebOS Quick Install
WebOS Quick Install is a Java application. Try to have a latest version of Java installed on your laptop/desktop. Execute the WebOSQuickInstall-xxx.jar as a Java application. The first time it's launched, it installs some drivers.

Any *.ipk files can be chosen and installed on the HP Touch Pad.

References : http://lifehacker.com/5836294/supercharge-your-new-hp-touchpad-with-preware

What is an xs:NCName type and when should it be used?

Came across a very good link on xs:NCName with the same title as above in stackoverflow.com - What is an xs:NCName type and when should it be used?