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Solve null pointer exception

Here is my Code: import java.sql.*; public class dbcon { Connection con; Statement st; ResultSet rs; dbcon() { try { Class.forName("net.ucanaccess.jdbc.UcanaccessDriver"); Connection con = DriverManager.getConnection("jdbc:ucanaccess:

Joomla- adding sortable columns to a table in a component

Adding sortable columns to Users Table in Admin section <th class="left"--> <!--?php echo JHtml::_('grid.sort', 'Candidate Number', 'candidate_number', $listDirn, $listOrder); ?--> </th> Adding sortable columns to a table in

What are the Best Programmatic Advertising Platforms

Programmatic advertising is among the emerging technologies in the world of digital advertising and marketing. Despite its growing popularity and rising adoption rate, programmatic continues to be the least understood digital marketing strategy. &nb

How to Display Advance Custom Fields in Wordpress - 2 Different Methods

Custom fields are the addition fields in WordPress that are used to show the custom data that we want to show/have in our WordPress posts/custom/posts or pages. While adding a new post in WP Website you will find draggable or drop-down boxes, those

Tuple in c#

Tuple is new feature added in C# 4.0 with dynamic programming. Tuple allow us to group a heterogeneous elements together. Tuple is new for the C# developers as it is already present in other languages like Python and F#.   Generally, In c# tup

How to Create a Group in Facebook Effectively

ny Are you thinking of creating an online community? Do you want a nice and related traffic for your post? Do you want to grow your business via group posting, where you don’t have to wait for your post approval?   The a

Liferay: How to create Custom Action By Hook?

We can modify Liferay JSP, services, properties by using Hooks. One of the main use of Hook is we can implement our Custom Action. So what is Custom Action? When you see portal.properties in your liferay source code. You will see there multiple

Steps to create module in DNN 7

I. Installing the templates 1. First of all you have to download Aspose.DNN.Templates_VS2013 from the given link: https://asposednn.codeplex.com/releases 2. Now double click on the downloaded file to install the templates in visual studio. II. Creat

Create dynamic editable table with HTML using javascript

If you want to create dynamic editable rows in a table using html and javascript, below example will helps you.   In the below code first I have created a button and then created table in which I have added 2 columns, as the output is shown&nb

How to add foreign key contraint to a column in MySql?

In many cases we need to create foreign key in a table. We can do this at the time of table creation and after the table creation by ALTER command. 1- At the time of table creation: CREATE TABLE user_device ( id int(11) NOT NULL AUTO_INCREMEN

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