Sachin Thapa

All web applications have fast rendering as one of the primary goals, JSON is a preferred choice in most of AJAX based applications because it is lightweight data interchange format. Consider a scenario where you have to read data from database and render it on UI, typically the steps which will be followed are: a. Send request data to server using AJAX calls b. At server end invoke the Business layer c. Business layer calls the database layer d. Data returned from database layer is populated into business objects e. From business objects build JSON objects, send them back to client f. Client use Javascript libraries to render data on UI. If everything works fine for you, you can stop reading right now, because you are achieving the required goal in the best way. But in real world this might not be working for you because of performance issues at one or the other step mentioned above. Here are few performance tips, they might suite in some of the scenarios and might be th...

For Java based applications the most challenging part has always been the business logic maintenance, and pick any applications which you find complex and if we ask ourself how complex it would be moving forward, the answer will always be nX times. What do we do ? Drools comes for Rescue as a Rule Engine. Drools provides mechanism: a. To write business logic in simple english language b. Easy to maintain and very simple to extend c. Reusability of logic by defining keywords in a DSL file and using them in DSLR file. But be careful nothing comes free, everything takes cost in terms of memory and time space. Use Drools if you really have : a. Business logic which you think is getting cluttered with multiple if conditions because of variety of scenarios b. You will have growing demand of increase in the complexity c. The business logic changes would be frequent (1 - 2 times a year would also be frequent) d. Your server's have enough of memory as it is a memory hungar...

No doubt about the movie of this song that was one of the best movies but I liked this song and thought to play it, was able to work on some of the begining lines, here are few song notes. Sa Re Umar Hum Ga Ga Re Sa Re Mar mar ke jee liye Ga Ga Re Sa Re Loved playing this song, will work on chords next weekend.

Class data sharing (CDS) a feature introduced in J2SE 5.0 reduces the startup time for Java programming language applications. When the JRE is installed on 32-bit platforms using the Sun provided installer, the installer loads a set of classes from the system jar file into a private internal representation, and dumps that representation to a file, called a "shared archive".Class data sharing is not supported in Microsoft Windows 95/98/ME. During subsequent JVM invocations, the shared archive is memory-mapped in, saving the cost of loading those classes and allowing much of the JVM's metadata for these classes to be shared among multiple JVM processes. The primary motivation for including CDS in the 5.0 release is the decrease in startup time it provides. CDS produces better results for smaller applications because it eliminates a fixed cost: that of loading certain core classes. The smaller the application relative to the number of core classes it uses, the larger the sav...

XML is the base of Web 2.0 development. While writing a web service to integrate products, I learned some best practices with XML naming conventions. An XML element is everything from (including) the element's start tag to (including) the element's end tag. An element can contain other elements, simple text or a mixture of both. Elements can also have attributes. <bookstore> <book category="CHILDREN"> <author>J K. Rowling</author> <year>2005</year> <price>29.99</price> </book> <book category="WEB"> <author>Erik T. Ray</author>> <year>2003</year> <price>39.95</price> </book> </bookstore>> In the example above, and have element contents, because they contain other elements. has text content because it contains text. In the example above only has an attribute (category="CHILDREN"). XML Naming Rules XML elements mus...

This article covers details about writing a web service client using Apache AXIS2 API. The article explains the various API using code snippets and covers parameters require by various methods of web service client API. Apache AXIS2 web service API mainly consists of two type of objects ServiceClient and OperationClient. ServiceClient provides basic APIs to send and receive SOAP messages, for advanced methods you require Operation Client. To provide target URL you need to define a EndPointReference type of object. EndpointReference targetEPR = new EndpointReference(http://localhost:8080/axis2/services/helloworld); Various options can be given to web service client by creating an Options object. The reference point defined is set into the options along with the Transport protocol. Options options = new Options(); options.setTo(targetEPR); options.setTransportInProtocol(Constants.TRANSPORT_HTTP); Now create a service client and pass these options to service client usi...

The purpose of this article is to talk about how to write web service and deploy it in Apache AXIS2. First step is downloading and installing apache axis2. There are two ways to use Apache AXIS2. 1. Install AXIS2 as a standalone server using the Standard Binary Distribution. 2. Deploy axis2.war and deploy it in a servlet container. We will be using the 2nd method in the article. To check the installation open the url http://localhost:8080/axis2 and you should be able to see the home page of apache axis2. Please locate the folder axis2\WEB-INF\services in exploded war file of axis2. This is the folder where you will copy the code of your service and it will get deployed in apache axis2. Lets us take a simple example. Write your service class. public class HelloWorld { public String sayHello(String firstName, String lastName) { System.out.println("Hello World Invoked"); MessageContext incomingContext = MessageContext.getCurrentMessageContext(); FileDataSourc...