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<td class="page-title-pattern-first-line " style="padding: 0; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiY2U3MzljYzgwZjJiNGY1NjllMjAwMTBjYmE1MTU0YzAiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-13664?atlOrigin=eyJpIjoiY2U3MzljYzgwZjJiNGY1NjllMjAwMTBjYmE1MTU0YzAiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-819922cf-9fcc-4246-a3a2-43d529f9011b" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-13664?atlOrigin=eyJpIjoiY2U3MzljYzgwZjJiNGY1NjllMjAwMTBjYmE1MTU0YzAiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">HHH-13664</a> </td>
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<td style="vertical-align: top;; padding: 0; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/HHH-13664?atlOrigin=eyJpIjoiY2U3MzljYzgwZjJiNGY1NjllMjAwMTBjYmE1MTU0YzAiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">SimpleTimestamper hangs in loop when system clock jumps backwards</a> </span> </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 5.3.13, 5.4.6 </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> image-2019-10-14-13-37-59-891.png </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> hibernate-core </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Created:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 14/Oct/2019 04:45 AM </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="ekupcik" style="color:#6c797f;; color: #3b73af; text-decoration: none" id="email_ekupcik" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%3A2cdebdc3-60aa-4c0b-aac2-c58ba530c8e8"> Emanuel Kupcik </a> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0; margin-top: 0">When the system clock jumps backwards SimpleTimestamper hangs in a "endless" loop and eats CPU time till the clock has reached at least the the time when the clock jumped backwards.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"> <span class="image-wrap" style=""><a id="49577_thumb" href="https://hibernate.atlassian.net/secure/attachment/49577/49577_image-2019-10-14-13-37-59-891.png" title="https://hibernate.atlassian.net/secure/attachment/49577/49577_image-2019-10-14-13-37-59-891.png" file-preview-type="image" file-preview-id="49577" file-preview-title="https://hibernate.atlassian.net/secure/attachment/49577/49577_image-2019-10-14-13-37-59-891.png" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-static-461237c0-4ba0-49b5-814d-b5bc083e7566"></a></span> </p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Just run this</p>
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">import</span> java.util.Date;
<span class="code-keyword" style="color: #000091">import</span> org.hibernate.cache.spi.support.SimpleTimestamper;
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">class </span>TimstamperTest {
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">static</span> void main(<span class="code-object" style="color: #910091">String</span>... args) {
<span class="code-keyword" style="color: #000091">while</span> (<span class="code-keyword" style="color: #000091">true</span>) {
<span class="code-object" style="color: #910091">System</span>.out.println(<span class="code-keyword" style="color: #000091">new</span> Date() + <span class="code-quote" style="color: #009100">" "</span> + SimpleTimestamper.next());
<span class="code-keyword" style="color: #000091">try</span> {
<span class="code-object" style="color: #910091">Thread</span>.sleep(100);
}
<span class="code-keyword" style="color: #000091">catch</span> (InterruptedException e) {
e.printStackTrace();
}
}
}
}
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">And then set the system clock to one day in the past. It will stop and instead just loop till you adjust the clock back again.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Not a big deal if you have NTP and the clock varies just a few milliseconds before it is adjusted again. But if there is a bigger change for whatever reason this will crash your system.</p> </td>
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{
"@context": "http://schema.org",
"@type": "EmailMessage",
"description": "View Issue",
"potentialAction": {
"@type": "ViewAction",
"target": "https://hibernate.atlassian.net/browse/HHH-13664?inbox=true&",
"name": "View Issue"
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"publisher": {
"@type": "Organization",
"name": "Atlassian",
"url": "https://www.atlassian.com"
}
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