{"id":752,"date":"2010-08-08T22:31:19","date_gmt":"2010-08-09T01:31:19","guid":{"rendered":"https:\/\/devkico.itexto.com.br\/?p=752"},"modified":"2010-08-08T22:35:54","modified_gmt":"2010-08-09T01:35:54","slug":"grails-resolvendo-o-problema-de-queda-de-conexao-com-o-mysql","status":"publish","type":"post","link":"https:\/\/devkico.itexto.com.br\/?p=752","title":{"rendered":"Grails: resolvendo o problema de queda de conex\u00e3o com o MySQL"},"content":{"rendered":"<p><a href=\"https:\/\/devkico.itexto.com.br\/wp-content\/uploads\/2010\/02\/grails_logo.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-604\" style=\"margin: 10px;\" title=\"grails_logo\" src=\"https:\/\/devkico.itexto.com.br\/wp-content\/uploads\/2010\/02\/grails_logo.png\" alt=\"\" width=\"163\" height=\"43\" \/><\/a>Voc\u00ea que trabalha com Grails e MySQL j\u00e1 topou com excess\u00f5es como estas: &#8220;<em>com.mysql.jdbc.CommunicationsException: Communications link failure<\/em>&#8220;, &#8220;<em>java.net.SocketException: Broken pipe<\/em>&#8221; , &#8220;<em>java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.<\/em>&#8221; ?<\/p>\n<p>Normalmente ocorrem ap\u00f3s algumas horas de inatividade da sua aplica\u00e7\u00e3o. Normalmente acontecem porqu\u00ea o MySQL fecha as conex\u00f5es inativas, algumas das quais eram justamente as do seu projeto. H\u00e1 duas solu\u00e7\u00f5es para o problema: uma porca e outra elegante.<\/p>\n<p>A porca \u00e9 simplesmente n\u00e3o fazer nada: ao mandar recarregar novamente a p\u00e1gina ser\u00e1 recriada a conex\u00e3o com o MySQL e parecer\u00e1 que o problema foi resolvido.<\/p>\n<p>A elegante \u00e9 alterar a se\u00e7\u00e3o <em>dataSource <\/em>do arquivo grails-app\/conf\/DataSource.groovy para que fique parecido com o exemplo abaixo:<\/p>\n<pre class=\"brush: java; title: ; notranslate\" title=\"\">\r\ndataSource {\r\npooled = true\r\ndriverClassName = &quot;com.mysql.jdbc.Driver&quot;\r\nusername = &quot;seu_usuario&quot;\r\npassword = &quot;sua_senha&quot;\r\nproperties {\r\n maxActive = 50\r\n maxIdle = 25\r\n minIdle = 5\r\n initialSize = 5\r\n minEvictableIdleTimeMillis = 60000\r\n timeBetweenEvictionRunsMillis = 60000\r\n maxWait = 10000\r\n validationQuery = &quot;\/* ping *\/&quot;\r\n }\r\n}\r\n<\/pre>\n<p><a href=\"https:\/\/devkico.itexto.com.br\/wp-content\/uploads\/2010\/08\/mysql1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-medium wp-image-753\" title=\"mysql1\" src=\"https:\/\/devkico.itexto.com.br\/wp-content\/uploads\/2010\/08\/mysql1-296x300.png\" alt=\"\" width=\"296\" height=\"300\" srcset=\"https:\/\/devkico.itexto.com.br\/wp-content\/uploads\/2010\/08\/mysql1-296x300.png 296w, https:\/\/devkico.itexto.com.br\/wp-content\/uploads\/2010\/08\/mysql1.png 491w\" sizes=\"(max-width: 296px) 100vw, 296px\" \/><\/a>A diferen\u00e7a \u00e9 a se\u00e7\u00e3o <em>properties<\/em>. Nela basta incluir as configura\u00e7\u00f5es do pool de conex\u00f5es do Hibernate. Por deafult, o Hibernate utiliza como gerenciador de pool de conex\u00f5es o C3P0 que, por sua vez, evita que voc\u00ea obtenha uma conex\u00e3o inv\u00e1lida com o banco de dados.<\/p>\n<p>Agora, explicando os par\u00e2metros:<\/p>\n<p>maxActive: n\u00famero m\u00e1ximo de conex\u00f5es abertas e ativas com o SGBD<br \/>\nmaxIdle: n\u00famero m\u00e1ximo de conex\u00f5es em stand by que voc\u00ea quer manter<br \/>\ninitialSize: n\u00famero inicial de conex\u00f5es com o banco de dados<br \/>\nminEvictableIdleTimeMillis: tempo m\u00ednimo em milisegundos para que o pool de conex\u00f5es comece a fechar conex\u00f5es em idle<br \/>\ntimeBetweenEvictionRunsMillis: o tempo entre as limpezas de conex\u00e3o em milisegundos<br \/>\nmaxWait: tempo m\u00e1ximo de espera em milisegundos para se obter uma conex\u00e3o ou de espera de resultado de uma conex\u00e3o<br \/>\nvalidationQuery: qualquer comando a ser enviado para o SGBD apenas para verificar se a conex\u00e3o est\u00e1 v\u00e1lida ou n\u00e3o.<\/p>\n<p>E \u00e9 isto: agora seus usu\u00e1rios (e voc\u00ea) n\u00e3o ver\u00e3o mais aquela maldita mensagem de erro ao acessar seu sistema pela manh\u00e3<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Voc\u00ea que trabalha com Grails e MySQL j\u00e1 topou com excess\u00f5es como estas: &#8220;com.mysql.jdbc.CommunicationsException: Communications link failure&#8220;, &#8220;java.net.SocketException: Broken pipe&#8221; , &#8220;java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.&#8221; ? Normalmente ocorrem ap\u00f3s algumas horas de inatividade da sua aplica\u00e7\u00e3o. Normalmente acontecem porqu\u00ea [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-gradient":""}},"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,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[3,7,24,8],"tags":[],"class_list":["post-752","post","type-post","status-publish","format-standard","hentry","category-grails","category-hibernate","category-jdbc","category-mysql"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Grails: resolvendo o problema de queda de conex\u00e3o com o MySQL - \/dev\/Kico<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/devkico.itexto.com.br\/?p=752\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Grails: resolvendo o problema de queda de conex\u00e3o com o MySQL - \/dev\/Kico\" \/>\n<meta property=\"og:description\" content=\"Voc\u00ea que trabalha com Grails e MySQL j\u00e1 topou com excess\u00f5es como estas: &#8220;com.mysql.jdbc.CommunicationsException: Communications link failure&#8220;, &#8220;java.net.SocketException: Broken pipe&#8221; , &#8220;java.io.EOFException: Can not read response from server. 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