Mixture (Sanskrit - मिश्रण) of Interesting Topics

Twin Trigger and Twin Trigger Combobox in ExtJS,  How to give qtip / quicktip / tooltip to Twin Trigger Field In ExtJS, there is a class Ext.form.TwinTriggerField (though its an abstract class) which is used to create objects of TwinTrigger, and can be extended to form n-trigger field.  Depending upon the requirement it can be easily, modified. Basically DateField and ComboBox are the examples of single trigger Textfield. Simple TwinTriggerField  Here is sample code how to use basic TwinTriggerField (which is basically a Textfield with two triggers/buttons which can be assigned different handlers) - new Ext.form.TwinTriggerField({ id : 'twintrigger', fieldLabel : "TwinTrigger", //Custom icon-classes for triggers trigger1Class : 'x-form-clear-trigger', //trigger2Class : 'customTriggerIcon', //Enable Key events over textfield enableKeyEvents : true, //Separate Trigger handlers onTrigger1Click : function(fie...

While designing UI's/User Screens and coding them in ExtJS (version less than Ext 4), we need certain TextFields which will allow only limited no of characters to be inputted , while others user can input any number of characters but user will be shown invalid-text saying only 'x' number of characters are allowed. Actually initially I wanted this limited input textfield in ExtJS, so one of my friend told me this. (as its easily possible with input text tag in normal HTML). In order to make any ExtJS Textfield with limited number of characters, use autoCreate config property and create text-input HTML tag. Here is example - Ext.onReady(function(){ Ext.QuickTips.init(); //Turn on validation errors beside the field globally Ext.form.Field.prototype.msgTarget = 'under'; var fp = new Ext.FormPanel({ frame: true, title:'TextField Examples', labelWidth : 150, width: 600, labelSeperator : '...

This isn't really a post, I am just writing a code to get all request parameters/attributes of a (HttpServletRequest) request object (almost every web developer must have tried this when in need). Sometimes while coding for form-submit-handling, or ajax request i.e. any request made to server, at server end, we need to know what all different parameters we receive from request. If this request was redirected/directed from some other jsp/servlet then we also would like to know if there is any request attribute present and if yes what all are those. So, to get all the request (i.e. javax.servlet.http.HttpServletRequest) object's parameters and attributes - Use this - System.out.println("To out-put All the request-attributes received from request - "); Enumeration enAttr = request.getAttributeNames(); while(enAttr.hasMoreElements()){ String attributeName = (String)enAttr.nextElement(); System.out.println("Attribute Name - "+attributeName+", V...

Few days back, for my personal project I wanted to send email notifications through my Java Application, then when I searched over net for SMTP server setup, I found out we can use gmail's SMTP server for free, we just need to have a gmail account and that's it. So worked out the code, initially I faced few issues, which I will briefly mention and how to solve them as well. Pre-requisites for using JavaMail API :- You need to have following files placed in your jdk/jre/lib directory, e.g. C:/Program Files/Java/jdk1.6.2/jre/lib. Note - Create plain text files and rename them (their extensions too) with following 4 file names. 1) javamail.address.map -  rfc822=smtp news=nntp 2) javamail.default.address.map -  rfc822=smtp 3) javamail.default.providers -  # JavaMail IMAP provider Sun Microsystems, Inc protocol=imap; type=store; class=com.sun.mail.imap.IMAPStore; vendor=Sun Microsystems, Inc; protocol=imaps; type=store; class=com.sun.mail.imap.IMAPSSLStore...

Log4j  is Apache's famous logging API and its been around from about quite a long time. I will explain what I know from my understanding of log4j, because its more than 2 years, I have been using log4j for any of my development. Over the internet there are many articles and books available about this, and this is my honest try to simplify how to use log4j. Basically log4j can be used any JAVA code (and of course in many other languages like C, C++, python, etc.) How to use / log using log4j -  1) First of all, download log4j.x.x.x.jar file from - h ttp://logging.apache.org/log4j/1.2/download.html  OR    older versions archive link is -  http://archive.apache.org/dist/logging/log4j/  and extract to get jar file. 2) Include the downloaded jar in your class-path, (I have taken log4j-1.2.8.jar.) 3) Import org.apache.log4j.Logger in your code.     i.e. import org.apache.log4j.Logger; 4) Create one more file ...

If you want to start JBoss Application Server as Windows Service (which basically frees you from every time starting/stopping the server manually, and if you have started JBoss using run.bat in JBoss's bin directory, then after log-off of current user, server goes down too.) We too had the same in our project, so we started looking over net is it possible and how to do it, t hese are the links which helped us the best - The official JBoss Community Link - http://www.jboss.org/jbossweb/install/service.html But one problem with above link was I could not find  service executable  jbosssvc.exe and other important batch script files, which are necessary to perform as given steps there. Here is one more link where you can get required files directly downloaded as zip file. (but not recommended) http://longsystemit.com/javablog/?p=12 Above links are sufficient to go forward and do as said in above links, but I will put the screen-shots, i...