Java has a strong support for web development. Java is mostly used for server side programming. Many modern Java web frameworks are based on servlets. A Java web application is a collection of dynamic resources such as Servlets, JavaServer Pages, Java classes and jars and static resources such as HTML pages and pictures. A Java servlet is a Java programming language program that extends the capabilities of a server. Although servlets can respond to any types of requests, they most commonly implement applications hosted on Web servers. Java Class - A class provides the blueprints for objects. So an object is created from a class. In Java, the new key word is used to create new objects.
Advantages of Java:
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An application server authored by JBoss, now developed by Red Hat. Jboss also known as WildFly is written in Java, and implements the Java Platform, Enterprise Edition (Java EE) specification. It runs on multiple platforms. It is a free and open source software.
Apache Tomcat is an open-source Java Authentication and Authorization Service (JAAS)web server and servlet container developed by the Apache Software Foundation (ASF). Tomcat implements several Java EE specifications including Java Servlet, JavaServer Pages (JSP), Java EL, and WebSocket, and provides a "pure Java" HTTP web server environment for Java code to run in. Tomcat 7.x implements the Servlet 3.0 and JSP 2.2 specifications. It requires Java version 1.6, although previous versions have run on Java 1.1 through 1.5. Versions 5 through 6 saw improvements in garbage collection, JSP parsing, performance and scalability. Native wrappers, known as "Tomcat Native", are available for Microsoft Windows and Unix for platform integration.
Apache Tomcat Features:
The Spring Framework is an open source application framework. It provides a comprehensive programming and configuration model for modern Java-based enterprise applications on different types of deployment platforms. Spring offers infrastructural support at the application.
It is an object-relational mapping framework for the Java language, providing a framework for mapping an object-oriented domain model to a traditional relational database. Hibernate solves object-relational impedance mismatch problems by replacing direct persistence-related database accesses with high-level object handling functions.