What is Weblogic

Introduction:

What is Weblogic? WebLogic Inc started in 1995 was a company credited with creating the first J2EE application server, the WebLogic Application Server. BEA Systems acquired WebLogic, Inc in 1998. Oracle Corporation acquired BEA Systems in 2008.

Today's business environment demands Web and e-commerce applications that accelerate your entry into new markets. Help you find new ways to reach and retain customers, and allow you to introduce new products and services quickly. To build and deploy these new solutions, you need a proven, reliable e-commerce platform that can connect. Empower all types of users while integrating your corporate data, mainframe applications. Other enterprise applications in a powerful, flexible, end-to-end e-commerce solution are empowered. Your solution must provide the performance, scalability, and high availability needed to handle your most critical enterprise-scale computing.

Highlights to answer your question i.e. where to start the weblogic learning are live Interactive sessions, Hands on training, Technical Assistance, 100% job oriented training, 24×7 Service and Support, Guidance for success in Interview Evaluations, and A comprehensive curriculum administered by well experienced and sophisticated trainers. A WebLogic Administration Online Training provides a development and execution platform for internal applications typically supporting internal business functions and external-facing applications, which can be business-critical, customer facing, supporting partners, and more.

The main objective of what is weblogic is students should master the administration trained by year’s experienced specialized expert with hands-on. This is one of the best WebLogic Administration Online Training institutes with well maintained technology and provides you session wise videos to your mail at free of cost. So this is the unique feature which no other institute provides you. This gives you the 100% assurance from our online WebLogic Administration Online Training website in gaining the required knowledge.

As industry-leading e-commerce transaction platform, WebLogic Server allows you to quickly develop and deploy reliable, secure, scalable and manageable applications. It manages system-level details so you can concentrate on business logic and presentation.

WebLogic Server is An Application server, A transaction server,A HTTP Web server, A messaging server, An EAI server. WebLogic Server is the Foundation of Oracle, Fusion Middleware.

During mid 90’s, Web Servers were primarily used to host the web sites. A web server supports only static html pages, images and no support for dynamic application code and enterprise integration. When Ecommerce became popular in 1997, developers wrote their own code to connect web server to back end systems.

The WebLogic Software is a self executable file and downloadable from Oracle site. It contains EJB Container, Servlet Container, JDBC Drivers, Transactional components, Proxy Plug-in, Smart update utilities, Security components, configuration and Administration scripts.

WebLogic Domain is a software folder. A domain is the basic administration unit for WebLogic Server instances. A domain consists of one or more WebLogic Server instances their associated resources that you manage with a single Administration Server. You can define multiple domains based on different system administrators' responsibilities, application boundaries, or geographical locations of servers.

WebLogic Server Instance is a run time JVM and it is part of WebLogic Domain. A Domain must have one Server Instance. A Server Instance listens on a logical port number. A domain can have more than one Server Instance. First Server Instance is called as Administration Server and it is used for administering the domain. Other Server Instances in a domain are called Managed Servers and they are used for hosting the deployed applications.

Two or more Managed Servers can be configured as a WebLogic Cluster to increase application scalability and availability. A cluster appears to clients to be a single WebLogic Server instance. A cluster is part of a particular WebLogic Server domain. Each server instance in a cluster must run the same version of WebLogic Server. All managed server instances in a cluster must reside in the same domain. You cannot split a cluster over multiple domains. IP Unicast or multicast, which server instances use to broadcast availability of services and heartbeats that indicate continued availability.

Node Manager is a Java utility that runs as separate process from WebLogic Server and allows you to perform common operations tasks for a Managed Server regardless of its location with respect to its Administration Server. Node Manager is WebLogic Domain Independent. You can start and stop the Managed Servers remotely (Remote Start) using the Administration Console or from the command line. Node Manager can also automatically restart (Auto Restart) a Managed Server after an unexpected failure. Node Manager automatically kills (Auto Kill) a Managed Server that— reports its health state as "failed“.

BEA WebLogic

BEA WebLogic Express is a scalable platform that serves dynamic content and data to Web and wireless applications. WebLogic Express incorporates the presentation and database access services from WebLogic Server, enabling developers to create interactive and transactional e-business applications quickly and to provide presentation services for existing applications.

WebLogic Express offers many services and APIs available with WebLogic Server, including WebLogic JDBC features, JavaServer Pages (JSP), servlets, Remote Method Invocation (RMI), and Web server functionality.

WebLogic Express differs from WebLogic Server in that WebLogic Express does not provide Enterprise JavaBeans (EJB), Java Message Services (JMS), or the two-phase commit protocol for transactions.

WebLogic Server

WebLogic Server implements Java 2 Platform, Enterprise Edition (J2EE) version 1.3 technologies. J2EE is the standard platform for developing multi-tier Enterprise applications based on the Java programming language. The technologies that make up J2EE were developed collaboratively by Sun Microsystems and other software vendors, including BEA Systems.

WebLogic Server J2EE applications are based on standardized, modular components. WebLogic Server provides a complete set of services for those modules and handles many details of application behavior automatically, without requiring programming.

J2EE defines module behaviors and packaging in a generic, portable way, postponing run-time configuration until the module is actually deployed on an application server.

J2EE includes deployment specifications for Web applications, EJB modules, Enterprise applications, client applications, and connectors. J2EE does not specify how an application is deployed on the target server—only how a standard module or application is packaged.

For each module type, the specifications define the files required and their location in the directory structure.

Note: Because J2EE is backward compatible, you can still run J2EE 1.3 applications on WebLogic Server versions 7.x and later.

Java is platform independent, so you can edit and compile code on any platform, and test your applications on development WebLogic Servers running on other platforms. For example, it is common to develop WebLogic Server applications on a PC running Windows or Linux, regardless of the platform where the application is ultimately deployed

Web services:

Web services can be shared by and used as modules of distributed Web-based applications. They commonly interface with existing back-end applications, such as customer relationship management systems, order-processing systems, and so on. Web services can reside on different computers and can be implemented by vastly different technologies, but they are packaged and transported using standard Web protocols, such as HTTP, thus making them easily accessible by any user on the Web.

A Web service consists of the following modules: 

A Web Service implementation hosted by a server on the Web. WebLogic Web Services are hosted by WebLogic Server. They are implemented using standard J2EE modules, such as Enterprise Java Beans, or with a Java class. They are packaged as standard J2EE Enterprise applications that contain a Web Application which contains the Web Service deployment descriptor file and the class files for Java class-implemented Web Services and the EJB JAR file for EJB-implemented Web Services. 

A standard for transmitting data and Web service invocation calls between the Web service and the user of the Web service. WebLogic Web Services use Simple Object Access Protocol (SOAP) 1.1 as the message format and HTTP as the connection protocol. 

A standard for describing the Web service to clients so they can invoke it. WebLogic Web Services use Web Services Description Language (WSDL) 1.1, an XML-based specification, to describe themselves. 

A standard for clients to invoke Web services (JAX-RPC). 

A standard for finding and registering the Web service (UDDI). 

§ Development Software

§ This section reviews required and optional tools for developing WebLogic Server applications.

§ Source Code Editor or IDE

§ You need a text editor to edit Java source files, configuration files, HTML or XML pages, and JavaServer Pages. An editor that gracefully handles Windows and UNIX line-ending differences is preferred, but there are no other special requirements for your editor. You can edit HTML or XML pages and JavaServer Pages with a plain text editor, or use a Web page editor such as DreamWeaver. For XML pages, you can also use BEA XML Editor or XMLSpy (bundled as part of the WebLogic Server package).

Database System and JDBC Driver

§ Nearly all WebLogic Server applications require a database system. You can use any DBMS that you can access with a standard JDBC driver, but services such as WebLogic Java Message Service (JMS) require a supported JDBC driver for Oracle, Sybase, Informix, Microsoft SQL Server, IBM DB2, or PointBase. Refer to Platform Support to find out about supported database systems and JDBC drivers.

§ Web Browser

§ Most J2EE applications are designed to be executed by Web browser clients. WebLogic Server supports the HTTP 1.1 specification and is tested with current versions of the Netscape Communicator and Microsoft Internet Explorer browsers.

§ When you write requirements for your application, note which Web browser versions you will support. In your test plans, include testing plans for each supported version. Be explicit about version numbers and browser configurations. Will your application support Secure Socket Layers (SSL) protocol? Test alternative security settings in the browser so that you can tell your users what choices you support.

§ If your application uses applets, it is especially important to test browser configurations you want to support because of differences in the JVMs embedded in various browsers. One solution is to require users to install the Java plug-in from Sun so that everyone has the same Java run-time version.

Conclusion:

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