In the case of web utilities (not only in Java), it is important to distinguish between servers and application servers. They are two different elements.

Application Server is a utility represented by a server. The latter deals with system support for programs and is also responsible for providing lifecycles in accordance with established operating principles. It functions either independently or as a provider of pages for other web-servers. Responsible for the exchange of information between software and clients. Creates the software environment for the final application, helps authorize and identify clients, organizes sessions for each “connected”.

Here are a few common utility servers in Java:

Tomcat Apache;
JBoss;
IBM WebSphere;
Oracle WebLogic.

The Web Server has mainly to do with the way the data is transferred. If we talk about Application Server, we can conclude that this is a narrower concept. Refers to the way programs are executed (remote processing of client commands). The corresponding terms are not placed in one row. They are responsible for completely different characteristics of software.

Java, like any other programming language, allows you to create unique content. If it belongs to the “web” type, we must first understand the technologies used to run the software and process the information. Java has several of them. It is worth choosing depending on what exactly the program is being written for.

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AJAX is mainly used in interactive user interfaces. Data exchange “browser-server” occurs in the background. We can describe the process as follows:

The user opens a page on the Internet.
Interaction with one or another element takes place.
The JS script determines what data is needed to update the page.
The browser sends a corresponding request to the web server.
The latter is responsible for returning the document to which the request was sent.
The script corrects the page taking into account the received data.
In general, the principle of operation is based on two variants. Each has its own nuances.

After the application of these technologies is functioning without reloading the entire page. This is a relatively quick solution to the problem.

The second approach – using DHTML for dynamic adjustment of information on the page.

What includes AJAX
When drawing up the code of the utility and the study of materials on the principles of web software need to understand – AJAX is not an independent technology. It includes the following implementation methods:

• HTML and CSS – to serve and style electronic materials;
• DOM-models – in charge of dynamically displaying and interacting with relevant information via JS;
• XMLHttpRequest or other transports (Iframe, SCRIPT tags and so on) – asynchronous exchange of content with the web server;
• JSON or other format of the corresponding nature (formatted HTML, test “variations”, XML) – exchange of information.
• In fact, AJAX – the concept of applying several technologies at once server-side.

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Since its inception (in 1995), it has actively evolved and improved. Now Java is convenient to use for computer programs as well as for mobile platforms. It is a full-fledged language that supports object-oriented programming. A key feature of Java is the ability to create web applications and extensions.

Before you start writing your first applications in Java, you need to know what features the corresponding language has. Not all “ways of communicating” with software and “iron” are suitable for writing specific content.

Java has the following features:

• Availability of functionality for OOP;
• clear and relatively simple syntax – even a novice amateur programmer can master it;
• Good user support – it is friendly to newcomers;
• a sufficient number of documentation in all languages;
• engine and libraries for writing games and all kinds of web utilities.
• Java perfectly “works” with the Web. It was for this purpose was originally planned to create it. It is also worth noting – the mentioned language is cross-platform. It is possible to transfer a program from one OS to another in the shortest time possible and without losing the quality of the original codification.

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