• Calculating Sales Tax and Discounts
• Determining OS Name
• Enabling SSL and installing certificates with Resin
• Executing Ant tasks programatically
• How to convert a JSEE keystore to an OpenSSL PEM?
• How to use the Gradle daemon?
• Java Screen Refresh and pcAnywhere
• Launching an Application with a Space in its Name
• Missing Symbol font when running Java under Linux
• Quickly convert a char to a zero padded hex string
• Send File to Browser using JSP
• Signing an Android Application (apk) for Release
• Testing Private Methods
• Using shift operator for faster division and multiplication
• Viewing SSL certificates with Keytool

Also look at my Development Tips & Tricks.