Tech Trek: A Software Engineer's Guide to Code and Beyond

This tutorial shows how to enable SSL support for Apache Tomcat web server. Requirement *) Apache Tomcat 5.0 *) JDK 1.5 Note: if you have JDK below 1.4, you need to install Java Secure Socket Extensions (JSSE) To install and configure SSL support on Tomcat, you need to follow these simple steps. Generating the KeyStore file: *) Create a keystore file to store the server's private key and self-signed certificate by executing the following         command. *) Enter command line and change directory to your JAVA\bin folder. (Default path is: C:\Program         Files\Java\jre6\bin). *) Type “keytool –genkey –alias tomcat –keyalg RSA" and press Enter.         Where tomcat is an alias name and RSA is a key algorithm. *) Type your password for the keystore. (Default password is: changeit). In this example, I’ll use password as “password" Enter general information about this Certificate. The example is the image be...

The Calendar class’ date/time API is a nifty tool for accurately manipulating date and time values without too much stress or custom coding. It provides direct support for time based objects. This article gives a few examples how this API can be used. . The class java.util.Date was the first implementation which was used for manipulating dates. The class java.util.Calendar was added in Java 1.1 and provides simplified access to storing and manipulating dates. It is recommended to use Calendar if possible. In reality you have to convert frequently from Date to Calendar and vice versa, e.g. during database access you often get a java.sql.Date object. The following explains how to use Calendar and how to convert Dates into Calendar. It also offers a set of methods for converting and manipulating temporal information. In addition to retrieving the current date and time, the Calendar class also provides an API for date arithmetic. The API takes care of the numerous minor adjustments t...

I’ve been working with OSGi for quite awhile and have faced a problem "Workbench has not been createt yet" issues. I was getting this error, When i was trying to run OSGI plugin from Eclipse and I guess many of you must have face this problem. So i am writing a little bit about how to resolve this issue so others don’t repeat the same mistakes. From a good article on eclipsezone: java.lang.IllegalStateException: Workbench has not been created yet This usually comes when someone tries to run a Java application against an OSGi bundle with java -classpath .... . It really means that the workbench plug-in hasn't started yet, and so calls to getWorkbench() fail. This is essentially a race condition, and can be solved by either expressing an explicit dependency on that bundle or bumping up that bundle to a higher start level than the workbench. Generally not seen, but if it is, that's what's happening. Now to set the bundle to a higher start level than the work...