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Java is a general programming language with the various features that makes a language to be well suited on World Wide Web. Java is oops based programming language in internet. Core java is an initial stage java training and Advance java (J2EE) explains the development in Web Application. Java is a more secured language than other various languages. In today’s world, a Java platform seemed to be a commonly used basis for develop and deliver of content on web.
Java is a general-purpose computer programming language that is concurrent, class-based, object-oriented, and specifically designed to have as few implementation dependencies as possible. It is intended to let application developers "write once, run anywhere" (WORA), meaning that compiled Java code can run on all platforms that support Java without the need for recompilation. Java applications are typically compiled to byte code that can run on any Java virtual machine (JVM) regardless of computer architecture. As of 2016, Java is one of the most popular programming languages in use, particularly for client-server web applications, with a reported 9 million developers. Java was originally developed by James Gosling at Sun Microsystems (which has since been acquired by Oracle Corporation) and released in 1995 as a core component of Sun Microsystems' Java platform. The language derives much of its syntax from C and C++, but it has fewer low-level facilities than either of them.
The original and reference implementation Java compilers, virtual machines, and class libraries were originally released by Sun under proprietary licenses. As of May 2007, in compliance with the specifications of the Java Community Process, Sun relicensed most of its Java technologies under the GNU General Public License. Others have also developed alternative implementations of these Sun technologies, such as the GNU Compiler for Java (byte code compiler), GNU Class path (standard libraries), and Iced Tea-Web (browser plugin for applets).
The latest version is Java 9, released on September 21, 2017, and is one of the two versions currently supported for free by Oracle. Versions earlier than Java 8 are supported by companies on a commercial basis; e.g. by Oracle back to Java 6 as of October 2017 (while they still "highly recommend that you uninstall" pre-Java 8 from at least Windows computers).
Java Platform, Enterprise Edition (Java EE), formerly Java 2 Platform, Enterprise Edition (J2EE), is a set of specifications, extending Java SE with specifications for enterprise features such as distributed computing and web services. Java EE applications are run on reference runtimes, that can be micro services or application servers, which handle transactions, security, scalability, concurrency and management of the components it is deploying.
Java EE is defined by its specification. The specification defines APIs and their interactions. As with other Java Community Process specifications, providers must meet certain conformance requirements in order to declare their products as Java EE compliant.
Examples of contexts in which Java EE referencing runtimes are used are: e-commerce, accounting, banking information systems.
J2EE Management Specification is a Java specification request (JSR-77) for standardization of J2EE server management. The J2EE Management Specification abstracts the manageable parts of the J2EE architecture and defines an interface for accessing management information. This helps system administrators integrate J2EE servers into a system management environment and also helps application developers create their own management tools from scratch.
The goal of JSR 77 is to abstract the fundamental manageable aspects of the J2EE architecture to provide a well-defined model for implementing instrumentation and information access. In addition, this specification defines a standardized API for inter-operating with J2EE components that participate in the monitoring and control of the platform’s resources.
The implementation of the JSR-77 for enterprise applications is done by the application server and for web modules [clarify] it is done by the web container.
The J2EE Management Model is a specification of the attributes, operations and architecture of the managed objects required by compliant J2EE platform implementations. The model is designed to be interoperable with a variety of industry standard management systems and protocols.
The Management EJB (MEJB) component provides interoperable remote access of the model to J2EE application components. All compliant implementations must support the MEJB component. This specification also provides standard mappings of the model to the CIM/WBEM Common Information Model (CIM) and the SNMP Management Information Base (MIB). Further, implementation support for SNMP and CIM/WBEM is optional.
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