{"id":955,"date":"2025-07-01T16:03:12","date_gmt":"2025-07-01T19:03:12","guid":{"rendered":"https:\/\/www.isacaguiar.com.br\/blog\/?p=955"},"modified":"2025-07-01T16:14:14","modified_gmt":"2025-07-01T19:14:14","slug":"%f0%9f%93%9d-analisando-aplicacoes-java-com-jstack","status":"publish","type":"post","link":"https:\/\/www.isacaguiar.com.br\/blog\/%f0%9f%93%9d-analisando-aplicacoes-java-com-jstack\/","title":{"rendered":"\ud83d\udcdd Analisando Aplica\u00e7\u00f5es Java com jstack"},"content":{"rendered":"<h2 data-start=\"212\" data-end=\"232\">\ud83c\udfaf <strong data-start=\"218\" data-end=\"232\">Introdu\u00e7\u00e3o<\/strong><\/h2>\n<p data-start=\"234\" data-end=\"471\">O <code data-start=\"236\" data-end=\"244\">jstack<\/code> \u00e9 uma ferramenta fundamental para diagnosticar problemas em aplica\u00e7\u00f5es Java. Ele permite visualizar o <strong data-start=\"347\" data-end=\"362\">thread dump<\/strong> de um processo, ou seja, o estado de todas as threads no momento da execu\u00e7\u00e3o. Essa an\u00e1lise \u00e9 essencial para:<\/p>\n<ul data-start=\"473\" data-end=\"640\">\n<li data-start=\"473\" data-end=\"516\">\n<p data-start=\"475\" data-end=\"516\">Identificar <strong data-start=\"487\" data-end=\"516\">gargalos de processamento<\/strong><\/p>\n<\/li>\n<li data-start=\"517\" data-end=\"541\">\n<p data-start=\"519\" data-end=\"541\">Detectar <strong data-start=\"528\" data-end=\"541\">deadlocks<\/strong><\/p>\n<\/li>\n<li data-start=\"542\" data-end=\"582\">\n<p data-start=\"544\" data-end=\"582\">Verificar threads presas ou bloqueadas<\/p>\n<\/li>\n<li data-start=\"583\" data-end=\"640\">\n<p data-start=\"585\" data-end=\"640\">Analisar consumo elevado de CPU por threads espec\u00edficas<\/p>\n<\/li>\n<\/ul>\n<h2 data-start=\"647\" data-end=\"676\">\ud83d\udd27 <strong data-start=\"653\" data-end=\"676\">Como usar o jstack?<\/strong><\/h2>\n<h3 data-start=\"678\" data-end=\"723\">1. <strong data-start=\"685\" data-end=\"723\">Identificar o PID do processo Java<\/strong><\/h3>\n<p data-start=\"725\" data-end=\"734\">No Linux:<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"wp-block-preformatted prism line-numbers lang-bash\" data-lang=\"BASH\"><code class=\"language-bash\">ps -ef | grep java<\/code><\/pre>\n<\/div>\n<p data-start=\"725\" data-end=\"734\">No Windows (cmd ou PowerShell):<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"wp-block-preformatted prism line-numbers lang-cmd\" data-lang=\"CMD\"><code class=\"language-cmd\">jps<\/code><\/pre>\n<p data-start=\"725\" data-end=\"734\">\n<\/div>\n<h3 data-start=\"822\" data-end=\"850\">2. <strong data-start=\"829\" data-end=\"850\">Executar o jstack<\/strong><\/h3>\n<p data-start=\"852\" data-end=\"884\">Com o PID identificado, execute:<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"wp-block-preformatted prism line-numbers lang-bash\" data-lang=\"BASH\"><code class=\"language-bash\">jstack <pid><\/pid><\/code><\/pre>\n<\/div>\n<p data-start=\"852\" data-end=\"884\">Para salvar o dump em um arquivo para an\u00e1lise posterior:<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"wp-block-preformatted prism line-numbers lang-bash\" data-lang=\"BASH\"><code class=\"language-bash\">jstack <pid> &gt; thread-dump.txt<\/pid><\/code><\/pre>\n<\/div>\n<h3 data-start=\"1019\" data-end=\"1061\">\ud83d\udd75\ufe0f\u200d\u2642\ufe0f <strong data-start=\"1030\" data-end=\"1061\">Interpretando o thread dump<\/strong><\/h3>\n<p data-start=\"1063\" data-end=\"1110\">O output do jstack mostra todas as threads com:<\/p>\n<ul data-start=\"1112\" data-end=\"1476\">\n<li data-start=\"1112\" data-end=\"1132\">\n<p data-start=\"1114\" data-end=\"1132\"><strong data-start=\"1114\" data-end=\"1132\">Nome da Thread<\/strong><\/p>\n<\/li>\n<li data-start=\"1133\" data-end=\"1390\">\n<p data-start=\"1135\" data-end=\"1154\"><strong data-start=\"1135\" data-end=\"1153\">Estado (State)<\/strong>:<\/p>\n<ul data-start=\"1157\" data-end=\"1390\">\n<li data-start=\"1157\" data-end=\"1200\">\n<p data-start=\"1159\" data-end=\"1200\"><code data-start=\"1159\" data-end=\"1169\">RUNNABLE<\/code>: em execu\u00e7\u00e3o ou aguardando CPU<\/p>\n<\/li>\n<li data-start=\"1203\" data-end=\"1267\">\n<p data-start=\"1205\" data-end=\"1267\"><code data-start=\"1205\" data-end=\"1214\">WAITING<\/code>: aguardando indefinidamente por outro recurso\/thread<\/p>\n<\/li>\n<li data-start=\"1270\" data-end=\"1311\">\n<p data-start=\"1272\" data-end=\"1311\"><code data-start=\"1272\" data-end=\"1287\">TIMED_WAITING<\/code>: aguardando com timeout<\/p>\n<\/li>\n<li data-start=\"1314\" data-end=\"1361\">\n<p data-start=\"1316\" data-end=\"1361\"><code data-start=\"1316\" data-end=\"1325\">BLOCKED<\/code>: esperando um lock de sincroniza\u00e7\u00e3o<\/p>\n<\/li>\n<li data-start=\"1364\" data-end=\"1390\">\n<p data-start=\"1366\" data-end=\"1390\"><code data-start=\"1366\" data-end=\"1378\">TERMINATED<\/code>: finalizada<\/p>\n<\/li>\n<\/ul>\n<\/li>\n<li data-start=\"1392\" data-end=\"1476\">\n<p data-start=\"1394\" data-end=\"1476\"><strong data-start=\"1394\" data-end=\"1410\">Stack trace:<\/strong> pilha de execu\u00e7\u00e3o mostrando onde a thread est\u00e1 atuando no c\u00f3digo.<\/p>\n<\/li>\n<\/ul>\n<h3 data-start=\"1483\" data-end=\"1517\">\u26a0\ufe0f <strong data-start=\"1490\" data-end=\"1517\">O que observar no dump?<\/strong><\/h3>\n<p data-start=\"1519\" data-end=\"1678\">\u2705 <strong data-start=\"1521\" data-end=\"1556\">Threads RUNNABLE consumindo CPU<\/strong><br data-start=\"1556\" data-end=\"1559\" \/>Se muitas threads est\u00e3o em <code data-start=\"1586\" data-end=\"1596\">RUNNABLE<\/code> executando m\u00e9todos pesados, pode haver gargalo de processamento ou loop infinito.<\/p>\n<p data-start=\"1680\" data-end=\"1800\">\u2705 <strong data-start=\"1682\" data-end=\"1701\">Threads BLOCKED<\/strong><br data-start=\"1701\" data-end=\"1704\" \/>Indica threads aguardando locks, revelando poss\u00edveis problemas de sincroniza\u00e7\u00e3o ou concorr\u00eancia.<\/p>\n<p data-start=\"1802\" data-end=\"1923\">\u2705 <strong data-start=\"1804\" data-end=\"1837\">Threads WAITING\/TIMED_WAITING<\/strong><br data-start=\"1837\" data-end=\"1840\" \/>Normalmente aguardam I\/O ou pool. Verifique se est\u00e3o presas al\u00e9m do tempo esperado.<\/p>\n<p data-start=\"1925\" data-end=\"2035\">\u2705 <strong data-start=\"1927\" data-end=\"1940\">Deadlocks<\/strong><br data-start=\"1940\" data-end=\"1943\" \/>O jstack informa no final do dump se h\u00e1 deadlocks detectados, mostrando os locks em disputa.<\/p>\n<h3 data-start=\"2042\" data-end=\"2080\">\ud83d\udca1 <strong data-start=\"2049\" data-end=\"2080\">Dicas pr\u00e1ticas para an\u00e1lise<\/strong><\/h3>\n<ol>\n<li data-start=\"2082\" data-end=\"2176\">\n<p data-start=\"2085\" data-end=\"2176\"><strong data-start=\"2085\" data-end=\"2132\">Colete m\u00faltiplos dumps em intervalos curtos<\/strong> para detectar padr\u00f5es ou travamentos reais:<\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"wp-block-preformatted prism line-numbers lang-bash\" data-lang=\"BASH\"><code class=\"language-bash\">for i in {1..3}; do\r\n  jstack <pid> &gt; jstack_dump_$i.txt\r\n  sleep 10\r\ndone\r\n<\/pid><\/code><\/pre>\n<\/div>\n<\/li>\n<li data-start=\"2082\" data-end=\"2176\"><strong data-start=\"2266\" data-end=\"2303\">Cruze informa\u00e7\u00f5es com top ou htop<\/strong><br data-start=\"2303\" data-end=\"2306\" \/>No Linux, utilize:\n<div class=\"hcb_wrap\">\n<pre class=\"wp-block-preformatted prism line-numbers lang-bash\" data-lang=\"BASH\"><code class=\"language-bash\">top -H -p <pid>\r\n<\/pid><\/code><\/pre>\n<\/div>\n<\/li>\n<li data-start=\"2494\" data-end=\"2554\"><strong data-start=\"2494\" data-end=\"2518\">Ferramentas de apoio<\/strong><br data-start=\"2518\" data-end=\"2521\" \/>Utilize analisadores online como:\n<div class=\"hcb_wrap\">\n<pre class=\"wp-block-preformatted prism line-numbers lang-bash\" data-lang=\"BASH\"><code class=\"language-bash\">printf \"%d\\n\" 0x1a3b\r\n<\/code><\/pre>\n<\/div>\n<\/li>\n<\/ol>\n<ul>\n<li data-start=\"2558\" data-end=\"2622\"><a data-start=\"2558\" data-end=\"2593\" class=\"\" rel=\"noopener\" target=\"_new\" href=\"https:\/\/fastthread.io\">fastThread<\/a> (Gratuito para dumps curtos)<\/li>\n<li data-start=\"2625\" data-end=\"2661\">IBM Thread and Monitor Dump Analyzer<\/li>\n<\/ul>\n<h3 data-start=\"2668\" data-end=\"2705\">\ud83d\udcdd <strong data-start=\"2675\" data-end=\"2705\">Exemplo de an\u00e1lise pr\u00e1tica<\/strong><\/h3>\n<p data-start=\"2707\" data-end=\"2736\">\ud83d\udd0d <strong data-start=\"2710\" data-end=\"2736\">1. Verificar deadlocks<\/strong><\/p>\n<p data-start=\"2738\" data-end=\"2806\">No final do dump, busque pela se\u00e7\u00e3o <code data-start=\"2774\" data-end=\"2805\">Found one Java-level deadlock<\/code>.<\/p>\n<p data-start=\"2808\" data-end=\"2842\">\ud83d\udd0d <strong data-start=\"2811\" data-end=\"2842\">2. Filtrar threads RUNNABLE<\/strong><\/p>\n<div class=\"hcb_wrap\">\n<pre class=\"wp-block-preformatted prism line-numbers lang-bash\" data-lang=\"BASH\"><code class=\"language-bash\">grep -A 10 RUNNABLE thread-dump.txt\r\n<\/code><\/pre>\n<\/div>\n<p data-start=\"2893\" data-end=\"2929\">\ud83d\udd0d <strong data-start=\"2896\" data-end=\"2929\">3. Verificar stacks repetidas<\/strong><\/p>\n<p data-start=\"2931\" data-end=\"3010\">Threads bloqueadas no mesmo m\u00e9todo indicam poss\u00edveis gargalos de sincroniza\u00e7\u00e3o.<\/p>\n<h2 data-start=\"3017\" data-end=\"3036\">\ud83d\ude80 <strong data-start=\"3023\" data-end=\"3036\">Conclus\u00e3o<\/strong><\/h2>\n<p data-start=\"3038\" data-end=\"3240\">O uso do <code data-start=\"3047\" data-end=\"3055\">jstack<\/code> deve fazer parte da rotina de an\u00e1lise de problemas em produ\u00e7\u00e3o ou ambientes de homologa\u00e7\u00e3o. Ele fornece visibilidade imediata do que est\u00e1 ocorrendo dentro do processo Java, permitindo:<\/p>\n<p data-start=\"3242\" data-end=\"3350\">\u2705 Diagn\u00f3stico r\u00e1pido de travamentos<br data-start=\"3277\" data-end=\"3280\" \/>\u2705 Identifica\u00e7\u00e3o de deadlocks<br data-start=\"3308\" data-end=\"3311\" \/>\u2705 Verifica\u00e7\u00e3o de consumo anormal de CPU<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\ud83c\udfaf Introdu\u00e7\u00e3o O jstack \u00e9 uma ferramenta fundamental para diagnosticar problemas em aplica\u00e7\u00f5es Java. Ele permite visualizar o thread dump de um\u2026<\/p>\n","protected":false},"author":1,"featured_media":960,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18,13],"tags":[],"class_list":["post-955","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-desenvolvimento-de-software","category-java"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\ud83d\udcdd Analisando Aplica\u00e7\u00f5es Java com jstack - Blog do Aguiar<\/title>\n<meta name=\"description\" content=\"Analisando Aplica\u00e7\u00f5es Java com jstackO jstack \u00e9 uma ferramenta fundamental para diagnosticar problemas em aplica\u00e7\u00f5es Java. 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