J2EE (Java 2 Platform, Enterprise Edition) is a platform for developing and running large-scale, multi-tiered, scalable, reliable, and secure network applications. It uses a distributed multi-tiered application model where application logic is divided into components running on different machines depending on their function. Components include web components, enterprise beans running business logic on the server, and application clients running on the client. The J2EE platform provides containers that manage these components and offer underlying services like transaction management, security, and connectivity.
This document provides an overview of Java Server Pages (JSP) technology. Some key points:
- JSP allows separation of work between web designers and developers by allowing HTML/CSS design and Java code to be placed in the same file.
- A JSP page is compiled into a servlet, so it can take advantage of servlet features like platform independence and database-driven applications.
- JSP pages use tags like <jsp:include> and <jsp:useBean> to include content and access JavaBeans. Scriptlets, expressions, declarations, and directives are also used.
- Implicit objects like request, response, out, and session are automatically available in JSP pages
Authentication and Authorization in Asp.NetShivanand Arur
This presentation gives a little information about Why Security is important, then moving towards understanding about Authentication and Authorization and its various ways
1. Forms Authentication
2. Windows Authentication
3. Passport Authentication
This document contains an agenda and slides for a presentation on Spring Boot. The presentation introduces Spring Boot, which allows developers to rapidly build production-grade Spring applications with minimal configuration. It demonstrates how to quickly create a "Hello World" application using Spring Boot and discusses some of the features it provides out-of-the-box like embedded servers and externalized configuration. The presentation also shows how to add additional functionality like Thymeleaf templates and actuator endpoints to monitor and manage applications.
This document provides an overview of Apache Tomcat, a free and open-source web server and servlet container developed by the Apache Software Foundation (ASF) that implements the Java Servlet and JavaServer Pages (JSP) technologies. It discusses what Tomcat is, its role as a web application container, how to install and configure it, enable features like CGI and SSI, and addresses some common issues. The advantages of using Tomcat include that it is open source, lightweight, easily configured, stable, well documented, and free.
Introduction to java beans, java beans, Core java, j2se, getting started with java beans programming, java to standard edition, beans in java, beans programming in java
Java applications cannot directly communicate with a database to submit data and retrieve the results of queries.
This is because a database can interpret only SQL statements and not Java language statements.
For this reason, you need a mechanism to translate Java statements into SQL statements.
The JDBC architecture provides the mechanism for this kind of translation.
The JDBC architecture can be classified into two layers :
JDBC application layer.
JDBC driver layer.
JDBC application layer : Signifies a Java application that uses the JDBC API to interact with the JDBC drivers. A JDBC driver is software that a Java application uses to access a database. The JDBC driver manager of JDBC API connects the Java application to the driver.
JDBC driver layer : Acts as an interface between a Java applications and a database. This layer contains a driver , such as a SQL server driver or an Oracle driver , which enables connectivity to a database.
A driver sends the request of a Java application to the database. After processing the request, the database sends the response back to the driver. The driver translates and sends the response to the JDBC API. The JDBC API forwards it to the Java application.
This document discusses Java Database Connectivity (JDBC) and the steps to connect to a database using JDBC. It provides an overview of JDBC architecture and its main components. It then outlines the key steps to connect to a database which include: 1) driver registration where the appropriate JDBC driver class is loaded, 2) defining the connection URL, 3) establishing a connection, 4) creating SQL statements, 5) executing queries and processing result sets, and 6) closing the connection. Examples are provided for connecting to MySQL and Derby databases using JDBC.
This document provides an overview of building web applications with J2EE. It introduces key J2EE concepts and technologies including the J2EE architecture with its layered approach, containers that provide services to components, and common technologies used like EJBs, JSF, XHTML. It also discusses J2EE servers, development lifecycles and tools, and provides an example blog application to demonstrate J2EE concepts in practice. The presentation concludes with a Q&A session.
This document provides an overview of Java Server Pages (JSP) technology. Some key points:
- JSP allows separation of work between web designers and developers by allowing HTML/CSS design and Java code to be placed in the same file.
- A JSP page is compiled into a servlet, so it can take advantage of servlet features like platform independence and database-driven applications.
- JSP pages use tags like <jsp:include> and <jsp:useBean> to include content and access JavaBeans. Scriptlets, expressions, declarations, and directives are also used.
- Implicit objects like request, response, out, and session are automatically available in JSP pages
Authentication and Authorization in Asp.NetShivanand Arur
This presentation gives a little information about Why Security is important, then moving towards understanding about Authentication and Authorization and its various ways
1. Forms Authentication
2. Windows Authentication
3. Passport Authentication
This document contains an agenda and slides for a presentation on Spring Boot. The presentation introduces Spring Boot, which allows developers to rapidly build production-grade Spring applications with minimal configuration. It demonstrates how to quickly create a "Hello World" application using Spring Boot and discusses some of the features it provides out-of-the-box like embedded servers and externalized configuration. The presentation also shows how to add additional functionality like Thymeleaf templates and actuator endpoints to monitor and manage applications.
This document provides an overview of Apache Tomcat, a free and open-source web server and servlet container developed by the Apache Software Foundation (ASF) that implements the Java Servlet and JavaServer Pages (JSP) technologies. It discusses what Tomcat is, its role as a web application container, how to install and configure it, enable features like CGI and SSI, and addresses some common issues. The advantages of using Tomcat include that it is open source, lightweight, easily configured, stable, well documented, and free.
Introduction to java beans, java beans, Core java, j2se, getting started with java beans programming, java to standard edition, beans in java, beans programming in java
Java applications cannot directly communicate with a database to submit data and retrieve the results of queries.
This is because a database can interpret only SQL statements and not Java language statements.
For this reason, you need a mechanism to translate Java statements into SQL statements.
The JDBC architecture provides the mechanism for this kind of translation.
The JDBC architecture can be classified into two layers :
JDBC application layer.
JDBC driver layer.
JDBC application layer : Signifies a Java application that uses the JDBC API to interact with the JDBC drivers. A JDBC driver is software that a Java application uses to access a database. The JDBC driver manager of JDBC API connects the Java application to the driver.
JDBC driver layer : Acts as an interface between a Java applications and a database. This layer contains a driver , such as a SQL server driver or an Oracle driver , which enables connectivity to a database.
A driver sends the request of a Java application to the database. After processing the request, the database sends the response back to the driver. The driver translates and sends the response to the JDBC API. The JDBC API forwards it to the Java application.
This document discusses Java Database Connectivity (JDBC) and the steps to connect to a database using JDBC. It provides an overview of JDBC architecture and its main components. It then outlines the key steps to connect to a database which include: 1) driver registration where the appropriate JDBC driver class is loaded, 2) defining the connection URL, 3) establishing a connection, 4) creating SQL statements, 5) executing queries and processing result sets, and 6) closing the connection. Examples are provided for connecting to MySQL and Derby databases using JDBC.
This document provides an overview of building web applications with J2EE. It introduces key J2EE concepts and technologies including the J2EE architecture with its layered approach, containers that provide services to components, and common technologies used like EJBs, JSF, XHTML. It also discusses J2EE servers, development lifecycles and tools, and provides an example blog application to demonstrate J2EE concepts in practice. The presentation concludes with a Q&A session.
This document summarizes the history and benefits of AngularJS. It explains that AngularJS was originally created in 2009 as a side project by Misko Hevery and Adam Abrons to build a tool for both front-end and back-end development. When working on a Google project called Google Feedback, Hevery was able to rewrite 17,000 lines of code into 1,500 lines using his AngularJS framework by taking advantage of its features like separation of concerns, modularity, and reusable components. The document then lists some key benefits of AngularJS like being lightweight, free, and improving structure, quality, organization and maintainability of code.
Hibernate is an object-relational mapping tool for Java that allows developers to persist Java objects to a relational database in a transparent way. It provides transparent persistence without needing to flatten objects or write database specific code. Hibernate uses an object-oriented query language that closely resembles SQL to retrieve and manipulate persisted objects.
Java Server Pages (JSP) is a technology that allows developers to create dynamic web applications using Java code embedded in HTML pages. JSP pages are compiled into Java servlets, allowing dynamic content to be generated. JSP supports the use of scripting elements like expressions, scriptlets, and declarations directly in HTML pages to add dynamic functionality. Common elements like directives, actions, and standard tags provide functionality like including pages, passing parameters, and abstracting common patterns.
Web forms are a vital part of ASP.NET applications and are used to create the web pages that clients request. Web forms allow developers to create web applications using a similar control-based interface as Windows applications. The ASP.NET page processing model includes initialization, validation, event handling, data binding, and cleanup stages. The page acts as a container for other server controls and includes elements like the page header.
This document provides an overview of Java servlets technology, including:
1. What Java servlets are and their main purposes and advantages such as portability, power, and integration with server APIs.
2. Key aspects of servlet architecture like the servlet lifecycle, the HttpServletRequest and HttpServletResponse objects, and how different HTTP methods map to servlet methods.
3. Examples of simple servlets that process parameters, maintain a session counter, and examples of deploying servlets in Eclipse IDE.
Welcome to presentation on Spring boot which is really great and relatively a new project from Spring.io. Its aim is to simplify creating new spring framework based projects and unify their configurations by applying some conventions. This convention over configuration is already successfully applied in so called modern web based frameworks like Grails, Django, Play framework, Rails etc.
This document provides an overview of Spring Security including:
I. It distinguishes Spring Framework, Spring Boot, and Spring Security and their relationships.
II. It defines Spring Security as a framework focusing on authentication and authorization for Java applications.
III. It outlines some of the core concepts in Spring Security such as Principal, Authentication, Authorization, GrantedAuthority etc.
The document serves as an introduction to Spring Security fundamentals and architecture.
The Java Naming and Directory Interface (JNDI) allows Java applications to look up and discover named objects in a directory service. JNDI provides a standard interface for naming and accessing resources such as databases. Distributed application components can use JNDI to locate other components and resources by name. The JNDI lookup method passes a name and returns the associated object, enabling access to resources without prior knowledge of implementation details or location.
The document provides an overview of working with JSON (JavaScript Object Notation). It introduces JSON, explaining its need and comparing it to XML. It describes JSON syntax rules, data types, objects, and arrays. It discusses how JSON uses JavaScript syntax and can be used in files. The document also covers JSON security concerns, using JSON with JavaScript functions, client-side frameworks, server-side frameworks, replacing XML with JSON, and parsing and AJAX with JSON and jQuery.
The document provides an overview of the Java programming language and related technologies including servlets, JSP, Struts, Hibernate, and Tiles. It discusses what Java is, its history and technology, the different Java editions, J2EE and its components, how servlets and JSP work, database handling with JDBC, the MVC pattern implemented by Struts, and object relational mapping with Hibernate. Tiles is described as a framework for assembling web pages from individual visual components.
Spring Boot is a framework for creating stand-alone, production-grade Spring based applications that can be "just run". It aims to provide a radically faster and widely accessible starting experience for developing Spring applications. Spring Boot applications can be started using java -jar or traditional WAR deployments and require very little Spring configuration. The document then discusses system requirements, development environment, creating a simple Hello World application, using Spring Boot Admin to monitor applications, configuring databases, Spring Data JPA, REST controllers, caching with EhCache, building web applications with Thymeleaf, and project structure.
The document discusses Swing, the graphical user interface (GUI) toolkit for Java. It introduces Swing as a replacement for the original Abstract Window Toolkit (AWT) that improved on AWT's weaknesses. Key points covered include:
- Swing was introduced in 1997 as part of the Java Foundation Classes to address AWT's limitations. It uses lightweight components instead of relying on native platform components.
- Swing supports pluggable look-and-feel and is based on the model-view-controller architecture. It includes a variety of common GUI components like tables, trees, sliders.
- Layout managers like FlowLayout, GridLayout, BorderLayout, and BoxLayout are used to position and
Spring Boot allows creating standalone Spring applications with minimal configuration. It makes assumptions about dependencies and provides default configurations. It aims to provide a faster development experience for Spring. Some key Spring Boot components include auto-configuration, core functionality, CLI, actuator for monitoring, and starters for common dependencies. To use Spring Boot, create a project with the Spring Initializr, add code and configurations, then build a jar file that can be run standalone.
This document provides an overview of ExpressJS, a web application framework for Node.js. It discusses using Connect as a middleware framework to build HTTP servers, and how Express builds on Connect by adding functionality like routing, views, and content negotiation. It then covers basic Express app architecture, creating routes, using views with different template engines like Jade, passing data to views, and some advanced topics like cookies, sessions, and authentication.
Ajax allows web pages to asynchronously update parts of a page by exchanging data with a web server behind the scenes without reloading the entire page. It uses a combination of technologies like HTML/XHTML, CSS, DOM, XML, JavaScript, and the XMLHttpRequest object. This allows faster and more interactive web applications by reducing the amount of data sent and received.
This document discusses AJAX (Asynchronous JavaScript and XML). It defines AJAX as a group of interrelated web development techniques used on the client-side to create interactive web applications. AJAX allows web pages to be updated asynchronously by exchanging small amounts of data with the server without reloading the entire page. The document outlines the technologies that power AJAX like HTML, CSS, XML, JavaScript, and XMLHttpRequest and how they work together to enable asynchronous updates on web pages.
JDBC provides a standard interface for connecting to and working with databases in Java applications. There are four main types of JDBC drivers: Type 1 drivers use ODBC to connect to databases but are only compatible with Windows. Type 2 drivers use native database client libraries but require the libraries to be installed. Type 3 drivers use a middleware layer to support multiple database types without native libraries. Type 4 drivers connect directly to databases using a pure Java implementation, providing cross-platform compatibility without additional layers.
The document discusses J2EE (Java 2 Enterprise Edition) interview questions and answers. It covers topics such as what J2EE is, J2EE modules, components, containers, deployment descriptors, transaction management, and differences between technologies like EJBs and JavaBeans. The document provides detailed explanations of core J2EE concepts.
Web programming and development - IntroductionJoel Briza
The document provides an overview of key concepts in web programming and Java Enterprise Edition (Java EE), including:
1) Java EE aims to provide developers with APIs to shorten development time and improve application performance. It is developed through the Java Community Process.
2) Java EE applications use a multitier architecture with client, web, business, and backend tiers. Components include web components, enterprise beans, and application clients.
3) Java EE containers manage the execution of components and include application servers, web containers, EJB containers, and application client containers.
This document summarizes the history and benefits of AngularJS. It explains that AngularJS was originally created in 2009 as a side project by Misko Hevery and Adam Abrons to build a tool for both front-end and back-end development. When working on a Google project called Google Feedback, Hevery was able to rewrite 17,000 lines of code into 1,500 lines using his AngularJS framework by taking advantage of its features like separation of concerns, modularity, and reusable components. The document then lists some key benefits of AngularJS like being lightweight, free, and improving structure, quality, organization and maintainability of code.
Hibernate is an object-relational mapping tool for Java that allows developers to persist Java objects to a relational database in a transparent way. It provides transparent persistence without needing to flatten objects or write database specific code. Hibernate uses an object-oriented query language that closely resembles SQL to retrieve and manipulate persisted objects.
Java Server Pages (JSP) is a technology that allows developers to create dynamic web applications using Java code embedded in HTML pages. JSP pages are compiled into Java servlets, allowing dynamic content to be generated. JSP supports the use of scripting elements like expressions, scriptlets, and declarations directly in HTML pages to add dynamic functionality. Common elements like directives, actions, and standard tags provide functionality like including pages, passing parameters, and abstracting common patterns.
Web forms are a vital part of ASP.NET applications and are used to create the web pages that clients request. Web forms allow developers to create web applications using a similar control-based interface as Windows applications. The ASP.NET page processing model includes initialization, validation, event handling, data binding, and cleanup stages. The page acts as a container for other server controls and includes elements like the page header.
This document provides an overview of Java servlets technology, including:
1. What Java servlets are and their main purposes and advantages such as portability, power, and integration with server APIs.
2. Key aspects of servlet architecture like the servlet lifecycle, the HttpServletRequest and HttpServletResponse objects, and how different HTTP methods map to servlet methods.
3. Examples of simple servlets that process parameters, maintain a session counter, and examples of deploying servlets in Eclipse IDE.
Welcome to presentation on Spring boot which is really great and relatively a new project from Spring.io. Its aim is to simplify creating new spring framework based projects and unify their configurations by applying some conventions. This convention over configuration is already successfully applied in so called modern web based frameworks like Grails, Django, Play framework, Rails etc.
This document provides an overview of Spring Security including:
I. It distinguishes Spring Framework, Spring Boot, and Spring Security and their relationships.
II. It defines Spring Security as a framework focusing on authentication and authorization for Java applications.
III. It outlines some of the core concepts in Spring Security such as Principal, Authentication, Authorization, GrantedAuthority etc.
The document serves as an introduction to Spring Security fundamentals and architecture.
The Java Naming and Directory Interface (JNDI) allows Java applications to look up and discover named objects in a directory service. JNDI provides a standard interface for naming and accessing resources such as databases. Distributed application components can use JNDI to locate other components and resources by name. The JNDI lookup method passes a name and returns the associated object, enabling access to resources without prior knowledge of implementation details or location.
The document provides an overview of working with JSON (JavaScript Object Notation). It introduces JSON, explaining its need and comparing it to XML. It describes JSON syntax rules, data types, objects, and arrays. It discusses how JSON uses JavaScript syntax and can be used in files. The document also covers JSON security concerns, using JSON with JavaScript functions, client-side frameworks, server-side frameworks, replacing XML with JSON, and parsing and AJAX with JSON and jQuery.
The document provides an overview of the Java programming language and related technologies including servlets, JSP, Struts, Hibernate, and Tiles. It discusses what Java is, its history and technology, the different Java editions, J2EE and its components, how servlets and JSP work, database handling with JDBC, the MVC pattern implemented by Struts, and object relational mapping with Hibernate. Tiles is described as a framework for assembling web pages from individual visual components.
Spring Boot is a framework for creating stand-alone, production-grade Spring based applications that can be "just run". It aims to provide a radically faster and widely accessible starting experience for developing Spring applications. Spring Boot applications can be started using java -jar or traditional WAR deployments and require very little Spring configuration. The document then discusses system requirements, development environment, creating a simple Hello World application, using Spring Boot Admin to monitor applications, configuring databases, Spring Data JPA, REST controllers, caching with EhCache, building web applications with Thymeleaf, and project structure.
The document discusses Swing, the graphical user interface (GUI) toolkit for Java. It introduces Swing as a replacement for the original Abstract Window Toolkit (AWT) that improved on AWT's weaknesses. Key points covered include:
- Swing was introduced in 1997 as part of the Java Foundation Classes to address AWT's limitations. It uses lightweight components instead of relying on native platform components.
- Swing supports pluggable look-and-feel and is based on the model-view-controller architecture. It includes a variety of common GUI components like tables, trees, sliders.
- Layout managers like FlowLayout, GridLayout, BorderLayout, and BoxLayout are used to position and
Spring Boot allows creating standalone Spring applications with minimal configuration. It makes assumptions about dependencies and provides default configurations. It aims to provide a faster development experience for Spring. Some key Spring Boot components include auto-configuration, core functionality, CLI, actuator for monitoring, and starters for common dependencies. To use Spring Boot, create a project with the Spring Initializr, add code and configurations, then build a jar file that can be run standalone.
This document provides an overview of ExpressJS, a web application framework for Node.js. It discusses using Connect as a middleware framework to build HTTP servers, and how Express builds on Connect by adding functionality like routing, views, and content negotiation. It then covers basic Express app architecture, creating routes, using views with different template engines like Jade, passing data to views, and some advanced topics like cookies, sessions, and authentication.
Ajax allows web pages to asynchronously update parts of a page by exchanging data with a web server behind the scenes without reloading the entire page. It uses a combination of technologies like HTML/XHTML, CSS, DOM, XML, JavaScript, and the XMLHttpRequest object. This allows faster and more interactive web applications by reducing the amount of data sent and received.
This document discusses AJAX (Asynchronous JavaScript and XML). It defines AJAX as a group of interrelated web development techniques used on the client-side to create interactive web applications. AJAX allows web pages to be updated asynchronously by exchanging small amounts of data with the server without reloading the entire page. The document outlines the technologies that power AJAX like HTML, CSS, XML, JavaScript, and XMLHttpRequest and how they work together to enable asynchronous updates on web pages.
JDBC provides a standard interface for connecting to and working with databases in Java applications. There are four main types of JDBC drivers: Type 1 drivers use ODBC to connect to databases but are only compatible with Windows. Type 2 drivers use native database client libraries but require the libraries to be installed. Type 3 drivers use a middleware layer to support multiple database types without native libraries. Type 4 drivers connect directly to databases using a pure Java implementation, providing cross-platform compatibility without additional layers.
The document discusses J2EE (Java 2 Enterprise Edition) interview questions and answers. It covers topics such as what J2EE is, J2EE modules, components, containers, deployment descriptors, transaction management, and differences between technologies like EJBs and JavaBeans. The document provides detailed explanations of core J2EE concepts.
Web programming and development - IntroductionJoel Briza
The document provides an overview of key concepts in web programming and Java Enterprise Edition (Java EE), including:
1) Java EE aims to provide developers with APIs to shorten development time and improve application performance. It is developed through the Java Community Process.
2) Java EE applications use a multitier architecture with client, web, business, and backend tiers. Components include web components, enterprise beans, and application clients.
3) Java EE containers manage the execution of components and include application servers, web containers, EJB containers, and application client containers.
The document discusses the evolution of J2EE architecture from single-tier to multi-tier architectures. It describes the key components and services in J2EE like EJBs, servlets, JSPs, JNDI, JTA, etc. It also discusses how J2EE applications are deployed on application servers with different containers managing different components.
The document discusses the roles involved in developing, assembling, and deploying Java EE applications. It describes the Java EE product provider who implements the Java EE platform, the tool provider who develops tools, the application component provider who creates reusable Java EE components packaged in JAR/WAR files, and the application assembler who bundles these components into an EAR file. Finally, an application deployer installs the EAR file onto a Java EE server.
This document provides an overview of the J2EE (Java 2 Enterprise Edition) technology components covered in the first day of a J2EE tutorial. It discusses the evolution of Java technologies and introduces the three main editions: J2SE, J2EE, and J2ME. The tutorial will focus on J2EE, which provides an integrated framework for developing enterprise applications. J2EE comprises component technologies like servlets and EJBs, service technologies like JNDI and JTA, and communication technologies. The document explains the J2EE architecture and containers, including the web container, EJB container, and applet container. It defines a J2EE container as a runtime that manages components and provides access to
The document contains information about a 3 hour exam with 4 questions worth 75 total marks. Question 1 is worth 15 marks and asks to attempt 3 of 5 parts labelled a through e. Part a provides details about Java EE application architecture including components, containers, and services. Part b classifies different Java EE containers. Part c provides a short note on the javax.servlet package, describing interfaces and classes. Part d explains the lifecycle of a servlet application including the different states. Part e explains the architecture of JDBC.
The document provides an overview of the Java EE 7 platform. It describes Java EE 7 as an enterprise application platform that aims to simplify development by providing common foundations and APIs. The key components of Java EE 7 applications include web components, enterprise beans, application clients, and Java EE containers that manage the execution of components. The document also outlines the architecture of Java EE applications and how different application parts interact, as well as APIs, tools, and benefits of the Java EE 7 platform for developers.
Introduction Java Web Framework and Web Server.suranisaunak
The document discusses Java 2 Enterprise Edition (J2EE) and frameworks. It defines J2EE as a set of standard specifications for building large distributed applications using components like Java servlets, JavaServer Pages, and Enterprise JavaBeans. Frameworks provide reusable code and APIs that help develop applications faster by handling common tasks. The document lists several Java persistence and web service frameworks and describes features that distinguish frameworks from normal libraries like inversion of control.
The document discusses J2EE packaging and deployment. It describes the different types of J2EE modules like EJB modules, web modules, application client modules, and resource adapter modules. It explains how these modules are packaged in JAR, WAR, RAR and EAR files and the containment hierarchy. It also covers exporting and sharing projects between workspaces.
The document provides an introduction to the Struts framework. It describes Struts as an open source MVC framework that implements the JSP Model 2 architecture. It stores routing information in a configuration file and separates the model, view, and controller layers. All requests are routed through the Struts controller which uses the configuration file to map requests to actions, which then call services and forward to view resources.
Module 02 discusses the JEE containers. Containers provide an interface between components and low-level platform functionality, allowing components to be executed only after being assembled into a module and deployed into their container. JEE containers offer security, transactions, lookup services, and remote connectivity. The JEE server provides EJB and web containers to manage enterprise beans and web components respectively, while the application client container manages clients.
J2EE Notes JDBC database Connectiviy and Programs related to JDBCChaithraCSHirematt
- Java 2 Platform, Enterprise Edition (J2EE) builds upon Java 2 Platform, Standard Edition (J2SE) and is used to create large, distributed, multi-tier enterprise applications. It provides APIs and services for these types of applications.
- J2EE applications typically use a multi-tier architecture with client, web, business, and data tiers. The client tier interacts with users/devices. The web tier contains web components like servlets and JSPs. The business tier houses enterprise beans that implement business logic. The data tier consists of databases.
- Containers in each tier manage components and provide common services. For example, the EJB container manages enterprise beans and provides transactions.
This document provides an overview of Enterprise JavaBeans (EJBs). It discusses that EJBs are reusable components that represent data and behavior, and can be combined visually using development tools. EJBs provide advantages like avoiding the need to write multi-threaded, database access, network communication, transaction management, and other complex code. EJBs from different systems can interact easily through well-defined interfaces. The document also outlines EJB containers, web browsers, applets and other Java EE components, and common scripts used to manage the Java EE server.
The document introduces the architecture of J2EE distributed applications. J2EE uses a multi-tiered model where application logic is divided into components installed on different machines depending on their tier. J2EE applications are generally three-tiered, with a client tier, application server tier, and database tier. The application server maintains control through containers and provides services to Web, EJB and client-side components. Components are assembled into applications along with deployment descriptors that configure settings for the containers. Major component types are session beans for business logic and entity beans for persistent data.
Introduction to J2EE framework . Gives the primary knowledge about the framework involves in J2EE based web development . This is like Struts , Hibernate , spring ,JSF etc.
This document provides an overview of enterprise application development using Java. It discusses the evolution from two-tier client-server architectures to the more scalable multi-tier Java 2 Platform, Enterprise Edition (J2EE). Key components of J2EE include servlets, JavaServer Pages (JSP), and Enterprise JavaBeans (EJB) that allow developing scalable applications across tiers for clients, presentation logic, and application logic. EJBs in particular help encapsulate complex business logic and coordinate transactional work across entity beans. The document outlines the benefits of J2EE like component-based models, container services, and simplified yet flexible architectures for developing enterprise applications using Java.
The document discusses the implementation of a project, including:
- The selection of Windows 7 and a platform-independent J2EE platform for development
- The selection of Java as the programming language due to its object-oriented capabilities, rich APIs, powerful development tools, open source libraries, and platform independence
- The use of Oracle Database for its reliability and ability to ensure data integrity through ACID properties
- Requirements including Java/J2EE, HTML, JavaScript, JSON, and Tomcat as the web server
- Guidelines for programming including naming conventions and handling exceptions
- The implementation procedure including creating a dynamic web project in Eclipse and exporting a WAR file
We have designed & manufacture the Lubi Valves LBF series type of Butterfly Valves for General Utility Water applications as well as for HVAC applications.
Particle Swarm Optimization–Long Short-Term Memory based Channel Estimation w...IJCNCJournal
Paper Title
Particle Swarm Optimization–Long Short-Term Memory based Channel Estimation with Hybrid Beam Forming Power Transfer in WSN-IoT Applications
Authors
Reginald Jude Sixtus J and Tamilarasi Muthu, Puducherry Technological University, India
Abstract
Non-Orthogonal Multiple Access (NOMA) helps to overcome various difficulties in future technology wireless communications. NOMA, when utilized with millimeter wave multiple-input multiple-output (MIMO) systems, channel estimation becomes extremely difficult. For reaping the benefits of the NOMA and mm-Wave combination, effective channel estimation is required. In this paper, we propose an enhanced particle swarm optimization based long short-term memory estimator network (PSOLSTMEstNet), which is a neural network model that can be employed to forecast the bandwidth required in the mm-Wave MIMO network. The prime advantage of the LSTM is that it has the capability of dynamically adapting to the functioning pattern of fluctuating channel state. The LSTM stage with adaptive coding and modulation enhances the BER.PSO algorithm is employed to optimize input weights of LSTM network. The modified algorithm splits the power by channel condition of every single user. Participants will be first sorted into distinct groups depending upon respective channel conditions, using a hybrid beamforming approach. The network characteristics are fine-estimated using PSO-LSTMEstNet after a rough approximation of channels parameters derived from the received data.
Keywords
Signal to Noise Ratio (SNR), Bit Error Rate (BER), mm-Wave, MIMO, NOMA, deep learning, optimization.
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Better Builder Magazine brings together premium product manufactures and leading builders to create better differentiated homes and buildings that use less energy, save water and reduce our impact on the environment. The magazine is published four times a year.
5. The J2EE platform uses a distributed multi tiered application model for enterprise applications
Application logic is divided into components according to function, and the various application components that make up a
J2EE application are installed on different machines depending on the tier in the multitiered J2EE environment to which the
application component belongs
J2EE application can consist of the three or four tiers shown in Figure 1-1,
Figure 1-1 Multitiered Applications
6. J2EE Components
J2EE applications are made up of components. A J2EE component is a self-contained functional software unit that is
assembled into a J2EE application with its related classes and files and that communicates with other components. The
J2EE specification defines the following J2EE components:
✔
Application clients and applets are components that run on the client.
✔
Java Servlet and JavaServer Pages (JSP) technology components are web components that run on the server.
✔
Enterprise JavaBeans (EJB) components (enterprise beans) are business components that run on the server.
J2EE components are written in the Java programming language and are compiled in the same way as any program in the
language.
NOTE:
The difference between J2EE components and "standard" Java classes is that J2EE components are assembled into
a J2EE application, are verified to be well formed and in compliance with the J2EE specification, and are deployed
to production, where they are run and managed by the J2EE server.
7. J2EE Clients
A J2EE client can be a web client or an application client.
Web Clients
A web client consists of two parts: (1) dynamic web pages containing various types of markup language (HTML,
XML, and so on), which are generated by web components running in the web tier, and (2) a web browser, which
renders the pages received from the server.
A web client is sometimes called a thin client. Thin clients usually do not query databases, execute complex business
rules, or connect to legacy applications. When you use a thin client, such heavyweight operations are off-loaded to
enterprise beans executing on the J2EE server, where they can leverage the security, speed, services, and reliability of
J2EE server-side technologies.
Applets
A web page received from the web tier can include an embedded applet. An applet is a small client application
written in the Java programming language that executes in the Java virtual machine installed in the web browser.
However, client systems will likely need the Java Plug-in and possibly a security policy file in order for the applet to
successfully execute in the web browser.
Web components are the preferred API for creating a web client program because no plug-ins or security policy files
are needed on the client systems. Also, web components enable cleaner and more modular application design because
they provide a way to separate applications programming from web page design. Personnel involved in web page
design thus do not need to understand Java programming language syntax to do their jobs.
8. J2EE Containers
Normally, thin-client multitiered applications are hard to write because they involve many lines of intricate code to handle
transaction and state management, multithreading, resource pooling, and other complex low-level details. The component-
based and platform-independent J2EE architecture makes J2EE applications easy to write because business logic is
organized into reusable components. In addition, the J2EE server provides underlying services in the form of a container for
every component type. Because you do not have to develop these services yourself, you are free to concentrate on solving the
business problem at hand.
9. Container Services
Containers are the interface between a component and the low-level platform-specific functionality that supports the
component. Before a web component, enterprise bean, or application client component can be executed, it must be
assembled into a J2EE module and deployed into its container.
The assembly process involves specifying container settings for each component in the J2EE application and for the
J2EE application itself. Container settings customize the underlying support provided by the J2EE server, including
services such as security, transaction management, Java Naming and Directory Interface (JNDI) lookups, and
remote connectivity. Here are some of the highlights:
✔
The J2EE security model lets you configure a web component or enterprise bean so that system resources are
accessed only by authorized users.
✔
The J2EE transaction model lets you specify relationships among methods that make up a single transaction so
that all methods in one transaction are treated as a single unit.
✔
JNDI lookup services provide a unified interface to multiple naming and directory services in the enterprise so
that application components can access naming and directory services.
✔
The J2EE remote connectivity model manages low-level communications between clients and enterprise beans.
After an enterprise bean is created, a client invokes methods on it as if it were in the same virtual machine
10. Container Types
J2EE Server and Containers
J2EE server
The runtime portion of a J2EE product. A J2EE server provides
EJB and web containers.
Enterprise JavaBeans (EJB) container
Manages the execution of enterprise beans for J2EE
applications. Enterprise beans and their container run on the
J2EE server.
Web container
Manages the execution of JSP page and servlet components for
J2EE applications. Web components and their container run on
the J2EE server.
Application client container
Manages the execution of application client components.
Application clients and their container run on the client.
Applet container
Manages the execution of applets. Consists of a web browser
and Java Plug-in running on the client together
11. A J2EE application is delivered in an Enterprise Archive (EAR) file,
An EAR file (see Figure 1-6) contains J2EE modules and deployment descriptors.
At runtime, the J2EE server reads the deployment descriptor and acts upon the application, module, or component accordingly.
Packing
12. A J2EE module consists of one or more J2EE components for the same container type and one component
deployment descriptor of that type. An enterprise bean module deployment descriptor, for example, declares
transaction attributes and security authorizations for an enterprise bean. A J2EE module without an application
deployment descriptor can be deployed as a stand-alone module. The four types of J2EE modules are as follows:
✔
EJB modules, which contain class files for enterprise beans and an EJB deployment descriptor. EJB
modules are packaged as JAR files with a .jar extension.
✔
Web modules, which contain servlet class files, JSP files, supporting class files, GIF and HTML files, and a
web application deployment descriptor. Web modules are packaged as JAR files with a .war (web archive)
extension.
✔
Application client modules, which contain class files and an application client deployment descriptor.
Application client modules are packaged as JAR files with a .jar extension.
✔
Resource adapter modules, which contain all Java interfaces, classes, native libraries, and other
documentation, along with the resource adapter deployment descriptor. Together, these implement the
Connector architecture (see ··J2EE Connector Architecture) for a particular EIS. Resource adapter modules are
packaged as JAR files with an .rar (resource adapter archive) extension
Packing
13. J2EE 1.4 APIs
J2EE Platform APIs
Enterprise JavaBeans Technology
An Enterprise JavaBeans (EJB) component, or
enterprise bean, is a body of code having fields and
methods to implement modules of business logic.
You can think of an enterprise bean as a building
block that can be used alone or with other enterprise
beans to execute business logic on the J2EE server.
There are three kinds of enterprise beans: session
beans, entity beans, and message-driven beans.
Enterprise beans often interact with databases. One
of the benefits of entity beans is that you do not have
to write any SQL code or use the JDBC API (see
JDBC API) directly to perform database access
operations; the EJB container handles this for you.
However, if you override the default container-
managed persistence for any reason, you will need to
use the JDBC API. Also, if you choose to have a
session bean access the database, you must use the
JDBC API.
14. Java Servlet Technology
Java servlet technology lets you define HTTP-specific servlet classes. A servlet class extends the capabilities of
servers that host applications that are accessed by way of a request-response programming model. Although servlets
can respond to any type of request, they are commonly used to extend the applications hosted by web servers.
JavaServer Pages Technology
JavaServer Pages (JSP) technology lets you put snippets of servlet code directly into a text-based document. A JSP
page is a text-based document that contains two types of text: static data (which can be expressed in any text-based
format such as HTML, WML, and XML) and JSP elements, which determine how the page constructs dynamic
content.
Java Message Service API
The Java Message Service (JMS) API is a messaging standard that allows J2EE application components to create,
send, receive, and read messages. It enables distributed communication that is loosely coupled, reliable, and
asynchronous.
Java Transaction API
The Java Transaction API (JTA) provides a standard interface for demarcating transactions. The J2EE architecture
provides a default auto commit to handle transaction commits and rollbacks. An auto commit means that any other
applications that are viewing data will see the updated data after each database read or write operation. However, if
your application performs two separate database access operations that depend on each other, you will want to use the
JTA API to demarcate where the entire transaction, including both operations, begins, rolls back, and commits.
15. JavaMail API
J2EE applications use the JavaMail API to send email notifications. The JavaMail API has two parts: an application-level
interface used by the application components to send mail, and a service provider interface. The J2EE platform includes
JavaMail with a service provider that allows application components to send Internet mail.
JDBC API
The JDBC API lets you invoke SQL commands from Java programming language methods. You use the JDBC API in an
enterprise bean when you override the default container-managed persistence or have a session bean access the database. With
container-managed persistence, database access operations are handled by the container, and your enterprise bean
implementation contains no JDBC code or SQL commands. You can also use the JDBC API from a servlet or a JSP page to
access the database directly without going through an enterprise bean.
The JDBC API has two parts: an application-level interface used by the application components to access a database, and a
service provider interface to attach a JDBC driver to the J2EE platform.
JNDI
J2EE naming services provide application clients, enterprise beans, and web components with access to a JNDI naming
environment. A naming environment allows a component to be customized without the need to access or change the
component's source code. A container implements the component's environment and provides it to the component as a JNDI
naming context
16. Application Clients
An application client runs on a client machine and provides a way for users to handle tasks that require a richer user
interface than can be provided by a markup language. It typically has a graphical user interface (GUI) created from
the Swing or the Abstract Window Toolkit (AWT) API, but a command-line interface is certainly possible.
Application clients directly access enterprise beans running in the business tier. However, if application requirements
warrant it, an application client can open an HTTP connection to establish communication with a servlet running in
the web tier