{"id":11788,"date":"2022-09-28T14:17:54","date_gmt":"2022-09-28T08:47:54","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-java-hashmaps-go-missing-after-a-period-of-not-using-them-duplicate\/"},"modified":"2022-09-28T14:17:54","modified_gmt":"2022-09-28T08:47:54","slug":"solved-java-hashmaps-go-missing-after-a-period-of-not-using-them-duplicate","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-java-hashmaps-go-missing-after-a-period-of-not-using-them-duplicate\/","title":{"rendered":"[Solved] Java hashmaps go missing after a period of not using them [duplicate]"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-41094556\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"41094556\" data-parentid=\"41094200\" data-score=\"1\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<pre><code>for (Location l : RunicParadise.explorerLocations.values()) {\n        **[NPE THROWN HERE] if (l.getWorld().getName().equals(loc.getWorld().getName())) {**\n<\/code><\/pre>\n<p>So the one thing that <em>wasn&#8217;t<\/em> null here was the <code>HashMap<\/code>: <code>explorerLocations<\/code>. Otherwise you would have got the NPE on the previous line where you called <code>HashMap.values()<\/code>.<\/p>\n<p><em>Any<\/em> of <code>l<\/code>, <code>l.getWorld()<\/code>, <code>l.getWorld().getName()<\/code>, <code>loc<\/code>, or <code>loc.getWorld()<\/code> could be null.<\/p>\n<p>You&#8217;re barking up the wrong tree.<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">3<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Java hashmaps go missing after a period of not using them [duplicate] <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] for (Location l : RunicParadise.explorerLocations.values()) { **[NPE THROWN HERE] if (l.getWorld().getName().equals(loc.getWorld().getName())) {** So the one thing that wasn&#8217;t null here was the HashMap: explorerLocations. Otherwise you would have got the NPE on the previous line where you called HashMap.values(). Any of l, l.getWorld(), l.getWorld().getName(), loc, or loc.getWorld() could be null. You&#8217;re barking up the &#8230; <a title=\"[Solved] Java hashmaps go missing after a period of not using them [duplicate]\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-java-hashmaps-go-missing-after-a-period-of-not-using-them-duplicate\/\" aria-label=\"More on [Solved] Java hashmaps go missing after a period of not using them [duplicate]\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[553,323],"class_list":["post-11788","post","type-post","status-publish","format-standard","hentry","category-solved","tag-hashmap","tag-java"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Java hashmaps go missing after a period of not using them [duplicate] - JassWeb<\/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:\/\/jassweb.com\/solved\/solved-java-hashmaps-go-missing-after-a-period-of-not-using-them-duplicate\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Java hashmaps go missing after a period of not using them [duplicate] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] for (Location l : RunicParadise.explorerLocations.values()) { **[NPE THROWN HERE] if (l.getWorld().getName().equals(loc.getWorld().getName())) {** So the one thing that wasn&#8217;t null here was the HashMap: explorerLocations. Otherwise you would have got the NPE on the previous line where you called HashMap.values(). Any of l, l.getWorld(), l.getWorld().getName(), loc, or loc.getWorld() could be null. You&#8217;re barking up the ... Read more\" \/>\n<meta property=\"og:url\" content=\"https:\/\/jassweb.com\/solved\/solved-java-hashmaps-go-missing-after-a-period-of-not-using-them-duplicate\/\" \/>\n<meta property=\"og:site_name\" content=\"JassWeb\" \/>\n<meta property=\"article:published_time\" content=\"2022-09-28T08:47:54+00:00\" \/>\n<meta name=\"author\" content=\"Kirat\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Kirat\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/jassweb.com\/solved\/solved-java-hashmaps-go-missing-after-a-period-of-not-using-them-duplicate\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-java-hashmaps-go-missing-after-a-period-of-not-using-them-duplicate\/\"},\"author\":{\"name\":\"Kirat\",\"@id\":\"https:\/\/jassweb.com\/solved\/#\/schema\/person\/65c9c7b7958150c0dc8371fa35dd7c31\"},\"headline\":\"[Solved] Java hashmaps go missing after a period of not using them [duplicate]\",\"datePublished\":\"2022-09-28T08:47:54+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/jassweb.com\/solved\/solved-java-hashmaps-go-missing-after-a-period-of-not-using-them-duplicate\/\"},\"wordCount\":66,\"publisher\":{\"@id\":\"https:\/\/jassweb.com\/solved\/#organization\"},\"keywords\":[\"hashmap\",\"java\"],\"articleSection\":[\"Solved\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/jassweb.com\/solved\/solved-java-hashmaps-go-missing-after-a-period-of-not-using-them-duplicate\/\",\"url\":\"https:\/\/jassweb.com\/solved\/solved-java-hashmaps-go-missing-after-a-period-of-not-using-them-duplicate\/\",\"name\":\"[Solved] Java hashmaps go missing after a period of not using them [duplicate] - 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Otherwise you would have got the NPE on the previous line where you called HashMap.values(). Any of l, l.getWorld(), l.getWorld().getName(), loc, or loc.getWorld() could be null. You&#8217;re barking up the ... 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