{"id":66342,"date":"2021-07-18T11:25:01","date_gmt":"2021-07-18T15:25:01","guid":{"rendered":"http:\/\/bangla.salearningschool.com\/recent-posts\/distributed-j2ee-applications-java-short-notes\/"},"modified":"2021-07-18T11:25:01","modified_gmt":"2021-07-18T15:25:01","slug":"distributed-j2ee-applications-java-short-notes","status":"publish","type":"post","link":"http:\/\/bangla.sitestree.com\/?p=66342","title":{"rendered":"Distributed J2EE Applications #Java Short Notes"},"content":{"rendered":"<ul>\n<li>Single tier applications are easier to design. Single tier applications mix data, presentation, business logic altogether. It is easier design but workload distribution becomes difficult. Moreover, software maintenance becomes a big headache.<\/li>\n<li>Multi-tier applications can address these challenges. Here, the application, hence, the workload is divided into multiple modules &#8211; tiers. The presentation, data, business logic can be separated from each other. This provides well organized software development. The workload can be divided among several developers more effectively. Also, software maintenance becomes easier.<\/li>\n<li>Multitiered Applications Benefits:\n<ul>\n<li>Availability: Accessible at all times &#8211; more accessible. Move parts of your applications into separate machines<\/li>\n<li>Extensibility: Ability to add more capabilities. Can add more capabilities without breaking the systems<\/li>\n<li>Scalability: Support more users: Add extra computing resources to each layer,<\/li>\n<li>Reliability: Maintain the accuracy and integrity of the data. Separating business logic from the rest of the applications, grouping operations into transactions<\/li>\n<li>Maintainability: Ability to update software code<\/li>\n<\/ul>\n<\/li>\n<li>Design considerations for Distributed Applications\/Systems\n<ul>\n<li>Event handling: Generation and notification of distributed events<\/li>\n<li>Persistence: How distributed objects are stored and accessed<\/li>\n<li>Concurrency: Acquiring and releasing locks in distributed environments<\/li>\n<li>Security: Mechanisms to provide distributed authentications, authorization, encryption, and auditing<\/li>\n<li>Transactions:<\/li>\n<li>Language dependencies<\/li>\n<li>Platform dependencies : Provide seamless operations irrespective of the underlying OSs or processors<\/li>\n<\/ul>\n<\/li>\n<li>Distributed object management issues:\n<ul>\n<li>Create and delete distributed objects<\/li>\n<li>Reliable communications among distributed objects<\/li>\n<li>Provide interfaces for object mapping<\/li>\n<li>Activating distributed objects and binding them to names<\/li>\n<li>Advertising and accessing objects and services<\/li>\n<\/ul>\n<\/li>\n<li>Design distributed systems:\n<ul>\n<li>Partition the problem into modular<\/li>\n<li>Make the module small enough to be individually solvable<\/li>\n<li>Findout the application and communication layers\/requirements<\/li>\n<\/ul>\n<\/li>\n<li>Transaction Management\n<ul>\n<li><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p> From: http:\/\/sitestree.com\/?p=4983<br \/> Categories:Java Short Notes<br \/>Tags:<br \/> Post Data:2006-12-04 23:22:04<\/p>\n<p>\t\tShop Online: <a href='https:\/\/www.ShopForSoul.com\/' target='new' rel=\"noopener\">https:\/\/www.ShopForSoul.com\/<\/a><br \/>\n\t\t(Big Data, Cloud, Security, Machine Learning): Courses: <a href='http:\/\/Training.SitesTree.com' target='new' rel=\"noopener\"> http:\/\/Training.SitesTree.com<\/a><br \/>\n\t\tIn Bengali: <a href='http:\/\/Bangla.SaLearningSchool.com' target='new' rel=\"noopener\">http:\/\/Bangla.SaLearningSchool.com<\/a><br \/>\n\t\t<a href='http:\/\/SitesTree.com' target='new' rel=\"noopener\">http:\/\/SitesTree.com<\/a><br \/>\n\t\t8112223 Canada Inc.\/JustEtc: <a href='http:\/\/JustEtc.net' target='new' rel=\"noopener\">http:\/\/JustEtc.net (Software\/Web\/Mobile\/Big-Data\/Machine Learning) <\/a><br \/>\n\t\tShop Online: <a href='https:\/\/www.ShopForSoul.com'> https:\/\/www.ShopForSoul.com\/<\/a><br \/>\n\t\tMedium: <a href='https:\/\/medium.com\/@SayedAhmedCanada' target='new' rel=\"noopener\"> https:\/\/medium.com\/@SayedAhmedCanada <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Single tier applications are easier to design. Single tier applications mix data, presentation, business logic altogether. It is easier design but workload distribution becomes difficult. Moreover, software maintenance becomes a big headache. Multi-tier applications can address these challenges. Here, the application, hence, the workload is divided into multiple modules &#8211; tiers. The presentation, data, business &hellip; <\/p>\n<p><a class=\"more-link btn\" href=\"http:\/\/bangla.sitestree.com\/?p=66342\">Continue reading<\/a><\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[1917],"tags":[],"class_list":["post-66342","post","type-post","status-publish","format-standard","hentry","category-fromsitestree-com","item-wrap"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":66338,"url":"http:\/\/bangla.sitestree.com\/?p=66338","url_meta":{"origin":66342,"position":0},"title":"J2EE Architecture: J2EE Design Patterns: Related Concepts #Java Short Notes","author":"Author-Check- Article-or-Video","date":"July 18, 2021","format":false,"excerpt":"Design Patterns What are design patterns? Design patterns are specific\/(context-based) solutions\/approaches to address specific problems\/situations. Some problems are general\/open problems and very common problems in a particular type of applications. Design patterns can be created to solve such problems in a specific context and that can be re-used every time\u2026","rel":"","context":"In &quot;FromSitesTree.com&quot;","block_context":{"text":"FromSitesTree.com","link":"http:\/\/bangla.sitestree.com\/?cat=1917"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":65910,"url":"http:\/\/bangla.sitestree.com\/?p=65910","url_meta":{"origin":66342,"position":1},"title":"MVC : Struts : Java : Industry Web Application #Java Short Notes","author":"Sayed","date":"July 17, 2021","format":false,"excerpt":"Industries use frameworks for application development quite often. For example: Java concepts like JSP, Servlet, Swing, Bean, JDBC can be used directly to create web-applications but when such applications become big, it becomes difficult to maintain and develop them further. Hence, frameworks like struts are used to develop large web-based\u2026","rel":"","context":"In &quot;FromSitesTree.com&quot;","block_context":{"text":"FromSitesTree.com","link":"http:\/\/bangla.sitestree.com\/?cat=1917"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":70191,"url":"http:\/\/bangla.sitestree.com\/?p=70191","url_meta":{"origin":66342,"position":2},"title":"Middleware for Sensor Networks #111","author":"Author-Check- Article-or-Video","date":"August 29, 2021","format":false,"excerpt":"Middleware for Smart Environments [jCook:05][on going] Smart Environment Components: Sensor Hardware Sensor Software Both help in perceiving\/sensing the environment Application Software Interprets and reasons about the perceived data Effector Control Software Act on the environment Some Support Systems Smart Environment Implementation Layers: Hardware layer Operating System Layer Middleware Layer Application\u2026","rel":"","context":"In &quot;FromSitesTree.com&quot;","block_context":{"text":"FromSitesTree.com","link":"http:\/\/bangla.sitestree.com\/?cat=1917"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":70197,"url":"http:\/\/bangla.sitestree.com\/?p=70197","url_meta":{"origin":66342,"position":3},"title":"Middleware for Smart Environments #111","author":"Author-Check- Article-or-Video","date":"August 29, 2021","format":false,"excerpt":"Middleware for Smart Environments [jCook:05][on going] <h2>Smart Environment Components:<\/h2> <ul> <li> Sensor Hardware <\/li><li> Sensor Software <ul> <li> Both help in perceiving\/sensing the environment <\/li><\/ul> <\/li><li> Application Software <ul> <li> Interprets and reasons about the perceived data <\/li><\/ul> <\/li><li> Effector Control Software <ul> <li> Act on the environment <\/li><\/ul> <\/li><li>Some\u2026","rel":"","context":"In &quot;FromSitesTree.com&quot;","block_context":{"text":"FromSitesTree.com","link":"http:\/\/bangla.sitestree.com\/?cat=1917"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":66328,"url":"http:\/\/bangla.sitestree.com\/?p=66328","url_meta":{"origin":66342,"position":4},"title":"Accessing EJBS from Servlet #Java Short Notes","author":"Author-Check- Article-or-Video","date":"July 18, 2021","format":false,"excerpt":"EJBs can be used to create enterprise applications like banking systems. Clients will interact with such systems for operations like: withdraw cash, transfer cash, pay bills When clients directly access EJBs it poses concerns such as: security risks, firewall blocking, EJB architecture becomes transparent to the clients Servlets can act\u2026","rel":"","context":"In &quot;FromSitesTree.com&quot;","block_context":{"text":"FromSitesTree.com","link":"http:\/\/bangla.sitestree.com\/?cat=1917"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":65958,"url":"http:\/\/bangla.sitestree.com\/?p=65958","url_meta":{"origin":66342,"position":5},"title":"Java: Common Architectures #Java Short Notes","author":"Author-Check- Article-or-Video","date":"July 18, 2021","format":false,"excerpt":"Common ArchitecturesTwo tier architecturesThree tier architecturesMulti-tier architecturesRich clients and browser-based clients in respect of Java EE applicationsWeb Services From: http:\/\/sitestree.com\/?p=4890 Categories:Java Short NotesTags: Post Data:2010-06-02 07:22:23 Shop Online: https:\/\/www.ShopForSoul.com\/ (Big Data, Cloud, Security, Machine Learning): Courses: http:\/\/Training.SitesTree.com In Bengali: http:\/\/Bangla.SaLearningSchool.com http:\/\/SitesTree.com 8112223 Canada Inc.\/JustEtc: http:\/\/JustEtc.net (Software\/Web\/Mobile\/Big-Data\/Machine Learning) Shop Online: https:\/\/www.ShopForSoul.com\/\u2026","rel":"","context":"In &quot;FromSitesTree.com&quot;","block_context":{"text":"FromSitesTree.com","link":"http:\/\/bangla.sitestree.com\/?cat=1917"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"_links":{"self":[{"href":"http:\/\/bangla.sitestree.com\/index.php?rest_route=\/wp\/v2\/posts\/66342","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/bangla.sitestree.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/bangla.sitestree.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/bangla.sitestree.com\/index.php?rest_route=\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"http:\/\/bangla.sitestree.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=66342"}],"version-history":[{"count":0,"href":"http:\/\/bangla.sitestree.com\/index.php?rest_route=\/wp\/v2\/posts\/66342\/revisions"}],"wp:attachment":[{"href":"http:\/\/bangla.sitestree.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=66342"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/bangla.sitestree.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=66342"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/bangla.sitestree.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=66342"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}