{"id":1477,"date":"2011-02-11T01:54:14","date_gmt":"2011-02-10T20:24:14","guid":{"rendered":"http:\/\/JitendraZaa.com\/blog\/?p=1477"},"modified":"2011-02-11T01:54:14","modified_gmt":"2011-02-10T20:24:14","slug":"why-not-to-write-constructor-in-servlet","status":"publish","type":"post","link":"https:\/\/www.jitendrazaa.com\/blog\/java\/servlet\/why-not-to-write-constructor-in-servlet\/","title":{"rendered":"Why not to write constructor in Servlet"},"content":{"rendered":"<p>Technically you can define constructors in servlet. But, the declared constructor cannot access the <strong>ServletConfig <\/strong>object or throw a <strong>ServletException<\/strong>.<\/p>\n<p>Then why is it not customary to declare a constructor in a servlet? Because the <strong>init()<\/strong> method is used to perform servlet initialization. In JDK 1.0 (servlet were written in this version), constructors for dynamically loaded Java classes such as servlets cannot accept arguments. Therefore<strong> init() was used to initialize by passing the implemented object of ServletConfig interface and other needed parameters.<\/strong><br \/>\nAlso, Java constructors cannot be declared in interfaces. So,<strong> javax.servlet.Servlet<\/strong> interface cannot have a constructor that accepts a ServletConfig parameter. To overcome this, init() method is used for initialization instead of declaring a constructor.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Why not to write constructor in Servlet<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"jz_research_post":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[11],"tags":[125],"class_list":["post-1477","post","type-post","status-publish","format-standard","hentry","category-servlet","tag-j2ee"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack-related-posts":[{"id":1479,"url":"https:\/\/www.jitendrazaa.com\/blog\/java\/servlet\/example-to-override-the-init-method-of-the-servlet\/","url_meta":{"origin":1477,"position":0},"title":"Example to Override the init() method of the servlet","author":"Jitendra","date":"February 11, 2011","format":false,"excerpt":"Example to Override the init() method of the servlet","rel":"","context":"In &quot;Servlet&quot;","block_context":{"text":"Servlet","link":"https:\/\/www.jitendrazaa.com\/blog\/category\/java\/servlet\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1467,"url":"https:\/\/www.jitendrazaa.com\/blog\/java\/servlet\/difference-between-servletcontext-and-servletconfig\/","url_meta":{"origin":1477,"position":1},"title":"Difference between servletContext and ServletConfig","author":"Jitendra","date":"February 8, 2011","format":false,"excerpt":"What is difference between servletContext and ServletConfig?","rel":"","context":"In &quot;Servlet&quot;","block_context":{"text":"Servlet","link":"https:\/\/www.jitendrazaa.com\/blog\/category\/java\/servlet\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":2017,"url":"https:\/\/www.jitendrazaa.com\/blog\/java\/java-j2ee-interview-questions-1\/","url_meta":{"origin":1477,"position":2},"title":"Java &#8211; J2EE Interview Questions &#8211; 1","author":"Jitendra","date":"April 15, 2011","format":false,"excerpt":"JAVA - J2EE Interview Questions - 1, JAVA - J2EE Interview Questions - 1,custom tag JSP, Externalization , serialVersionUID, difference between interface and abstract class, iterate HashMap","rel":"","context":"In &quot;JAVA&quot;","block_context":{"text":"JAVA","link":"https:\/\/www.jitendrazaa.com\/blog\/category\/java\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1439,"url":"https:\/\/www.jitendrazaa.com\/blog\/java\/difference-in-httpservlet-and-genericservlet\/","url_meta":{"origin":1477,"position":3},"title":"Difference in HttpServlet and GenericServlet","author":"Jitendra","date":"February 4, 2011","format":false,"excerpt":"What is the basic Difference in HttpServlet and GenericServlet","rel":"","context":"In &quot;JAVA&quot;","block_context":{"text":"JAVA","link":"https:\/\/www.jitendrazaa.com\/blog\/category\/java\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":1494,"url":"https:\/\/www.jitendrazaa.com\/blog\/java\/servlet\/life-cycle-of-servlet\/","url_meta":{"origin":1477,"position":4},"title":"Life Cycle of Servlet","author":"Jitendra","date":"February 12, 2011","format":false,"excerpt":"Explain Life Cycle of Servlet","rel":"","context":"In &quot;Servlet&quot;","block_context":{"text":"Servlet","link":"https:\/\/www.jitendrazaa.com\/blog\/category\/java\/servlet\/"},"img":{"alt_text":"Servlet Life Cycle","src":"https:\/\/i0.wp.com\/jitendrazaa.com\/blog\/wp-content\/uploads\/2011\/02\/Servlet-Life-Cycle.jpg?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":1464,"url":"https:\/\/www.jitendrazaa.com\/blog\/java\/servlet\/what-is-preinitialization-of-servlet\/","url_meta":{"origin":1477,"position":5},"title":"What is preinitialization of servlet","author":"Jitendra","date":"February 8, 2011","format":false,"excerpt":"What is preinitialization of servlet","rel":"","context":"In &quot;Servlet&quot;","block_context":{"text":"Servlet","link":"https:\/\/www.jitendrazaa.com\/blog\/category\/java\/servlet\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]}],"jetpack_likes_enabled":true,"_links":{"self":[{"href":"https:\/\/www.jitendrazaa.com\/blog\/wp-json\/wp\/v2\/posts\/1477","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.jitendrazaa.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.jitendrazaa.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.jitendrazaa.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.jitendrazaa.com\/blog\/wp-json\/wp\/v2\/comments?post=1477"}],"version-history":[{"count":0,"href":"https:\/\/www.jitendrazaa.com\/blog\/wp-json\/wp\/v2\/posts\/1477\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.jitendrazaa.com\/blog\/wp-json\/wp\/v2\/media?parent=1477"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.jitendrazaa.com\/blog\/wp-json\/wp\/v2\/categories?post=1477"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.jitendrazaa.com\/blog\/wp-json\/wp\/v2\/tags?post=1477"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}