How To Debug Smack API (Java XMPP Library)

February 24th, 2008 A simple tip for newbies - how to get Java stack trace, the invaluable tool to debug java programs, in Linux: - Type the Ctrl key followed by \, in short Ctrl \. I just used it to debug a persistent problem where a server process which automatically fetches data from a third-party site was inexplicably hanging.

August 2nd, 2005 Debugging guidelines for NetBeans and Sun Java Studio Enterprise. Debugging Tips for Applications Built With Sun Java Studio Enterprise 7 Debugging Java Software using NetBeans 3.6

November 14th, 2006 Sun is slowly releasing its implementations of the Java platform. The components of the Java SE implementation that Sun is releasing initially are the Java programming-language compiler (javac) and the Java HotSpot virtual machine.

August 24th, 2005 iText is a java software library which contains API to generate documents in the Portable Document Format (PDF), XML, HTML and RTF. It can also parse XML documents and convert them into any of these formats.

May 17th, 2006 Google has released GWT - a java window toolkit which converts your java applications (using the toolkit API) to javascript (incl. AJAX) and HTML.

August 17th, 2007 I faced quite some problems, to say the least, in configuring Pidgin / Gaim to connect to OpenFire XMPP Server on Fedora Core 6. Here are the detailed steps for a no-brainer configuration of Gaim for OpenFire: 1.

September 23rd, 2008 You may run Java processes in the foreground or in many cases they may be run using cron jobs or during system startup, as background processes. How can you find out stacktraces of any running Java process? But first how can you even know their name & process id's? How to find process id (pid) of all running Java processes? The following command displays list of all running Java processes in your machine - $JAVA_HOME/bin/jps Note the process id of the process you want to get stacktrace as you will need it in the next step.

August 16th, 2005 Back to The POJO days and lots of goodies scheduled with Java Enterprise Edition 5.

April 24th, 2005 ThreadLocal allows you to have copy of variable per thread, which are subject to garbage collection when the thread goes away. IBM has an excellent article on understanding and using ThreadLocal.

May 19th, 2007 HSQLD is a mature, high-performant database written in Java. It is used in several high profile popular commercial and open source products like Open Office 2.0 (Office productivity suite; competitor of MS Office), JBoss (Application Server), JFox (Application Server), Jonas (Application Server), Mathemetica, Hibernate (ORM), Jira (Defect Tracking), TrackStudio (Defect Tracking), C-JDBC (Database Clustering) etc.

September 8th, 2008 While debugging code Java programmers often use System.out.println(). It is important to write separate message in each System.out.println() so you can understand from the output where the problem lies.

August 8th, 2007 After much debugging I realized that in creating dialogs using Ext.LayoutDialog class of ExtJS library we must specify the configuration for east, west, north and south properties, as required, in the LayoutDialog config (see below for more requirements, details and a working example). This should be done before you add the content panels to the layout of the dialog.

March 15th, 2005 J2SE stands for Java 2 Standard Edition. The 2 stands for version 2 of the platform.

April 15th, 2006 In my experience much of the complexities a newcomer faces in the Java world is understanding extraneous stuff like handling exceptions or formatting data etc. Today I was requested for the nth time (n -> infinity) how to write a simple socket client and server (actually debug one).

November 13th, 2007 Openfire (Jabber/XMPP server) by default binds on port 8080 which is also used by Tomcat. This causes Tomcat to fail when openfire is started before it.