A top software consulting is looking for Java developers. There are multiple open positions like Java Developers, Senior Java Developers, Technical Leads and Architects. Candidates who have strong knowledge in Java and in one or more of the following skills can apply:
Struts
Spring
Hibernate
Web services
JSP
EJB
Application servers like Weblogic or Websphere or JBoss.
Databases like Oracle or DB2.
Design tools like Rational Software Architect or Enterprise Architect.
Good knowledge in design patterns.
Version control systems like Clearcase or Subversion.
Company Information
The company is one of the top 4 software consulting companies in US with over 56,000 employees and offices in 87 cities. The company provides very good pay package and benefits. For those who are on H1, the company will transfer H1.
Note: I am an employee of the company and your profile will be submitted as an internal referral.
AJAX stands for Asynchronous JavaScript And XML. AJAX is not a new programming technology but a concept which makes use of existing technologies. AJAX is based on JavaScript, XML and HTTP requests.
AJAX allows to refresh smaller portion of a webpage without reloading the entire webpage. This makes an AJAX application faster and more interactive. AJAX uses asynchronous data transfer (HTTP requests) between the browser and the web server, allowing web pages to request small bits of information from the server instead of whole pages.
open() and send() methods are used to send data to a web server.
open() method takes 3 arguments: First argument specifies GET or POST method. Second argument sepcifies the url to be invoked. Third argument specifies if the request is asynchronous are not.
AJAX requests should use an HTTP GET request when retrieving data where the data will not change for a given request URL. An HTTP POST should be used when state is updated on the server. This is in line with HTTP idempotency recommendations and is highly recommended for a consistent web application architecture.
AJAX is basically an asyncronous processing concept. A synchronous request would block in page event processing and there are not many cases where a synchronous request is required.
onreadystatechange event listening property of XMLHttpRequest which is mapped to a user defined function. The mapped function will be automatically processed after the server response event.
The readyState is a read only property which holds the status of the server's response. Each time the readyState changes, the onreadystatechange function will be executed.
The following are the possible values for the readyState property: 0 - The request is not initialized 1 - The request has been set up 2 - The request has been sent 3 - The request is in process 4 - The request is complete
While responseText returns the HTTP response as a string, responseXML returns the response as XML. The responseXML property returns an XML document object, which can be examined and parsed.
You can make more than one simultaneous AJAX request. The response may not in the same order as request sequence. Internet Explorer allows only two requests at a time, others browsers may allow upto 5 simultaneous requests.
AJAX is mostly driven by Javascript and Javascript is loosely built based on Java conventions. JavaScript can not access the local filesystem without the user's permission. An AJAX interaction can only be made with the servers-side component from which the page was loaded, etc makes AJAX pretty safe.
DWR stands for Direct Web Reporting. DWR allows Javascript in a browser to interact with Java on a server and helps you manipulate web pages with the results. On the server side DWR uses a Servlet to interact with the Java objects and returns object representations of the Java objects or XML documents. DWR is also sometimes referred as Reverse-Ajax.
The following are the features of Dojo Toolkit: - Powerful AJAX-based I/O abstraction (remoting). - Graceful degradation. - Backward, forward, bookmarking support. - Aspect-oriented event system. - Markup-based UI construction through widgets. - Widget prototyping. - Animation
Prototype JavaScript library contains a set of JavaScript objects for representing AJAX requests and contains utility functions for accessing in page components and DOM manipulations.
With Google Web Toolkit (GWT), you write your AJAX front-end in the Java programming language which GWT then cross-compiles into optimized JavaScript that automatically works across all major browsers.
The Yahoo User Interface (YUI) Library is a set of utilities and controls, written in JavaScript, for building richly interactive web applications using techniques such as DOM scripting, DHTML and AJAX. The YUI Library also includes several core CSS resources