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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/OGM?atlOrigin=eyJpIjoiNzZkZjUyNzlkY2ViNDhkYTk2ZWMzNTkyNDVlODQ4MjIiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">Hibernate OGM</a> / <a href="https://hibernate.atlassian.net/browse/OGM-1544?atlOrigin=eyJpIjoiNzZkZjUyNzlkY2ViNDhkYTk2ZWMzNTkyNDVlODQ4MjIiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-ef71b9fa-25ab-4eea-8a28-2248f8a39b79" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/OGM-1544?atlOrigin=eyJpIjoiNzZkZjUyNzlkY2ViNDhkYTk2ZWMzNTkyNDVlODQ4MjIiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">OGM-1544</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/OGM-1544?atlOrigin=eyJpIjoiNzZkZjUyNzlkY2ViNDhkYTk2ZWMzNTkyNDVlODQ4MjIiLCJwIjoiaiJ9" style="color: #3b73af; text-decoration: none">MongoDBDialect uses shared Parboiled parser across multiple threads, while the parser is NOT thread safe</a> </span> </td>
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<td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-avatar-ef71b9fa-25ab-4eea-8a28-2248f8a39b79" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"> Bug </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">Affects Versions:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 5.4.0.Final </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"> Unassigned </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"> mongodb </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"> 22/Nov/2018 07:48 AM </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">Environment:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> Hibernate 5.3.7 <br> OpenJDK 11 <br> Spring Boot 2.1 <br> MongoDB 3.4 </td>
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<td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-static-blocker-fdd0e779-c100-4a0f-8563-0014ef163550" height="16" width="16" border="0" align="absmiddle" alt="Blocker" style="vertical-align: text-bottom"> Blocker </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="gitdude" id="email_gitdude" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=gitdude" style="color:#6c797f;; color: #3b73af; text-decoration: none">gitdude</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 executing multiple (same) native queries against MongoDB (using createNativeQuery), following error happens easily:</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">java.lang.IllegalArgumentException: Cannot peek beyond the bottom of the stack<br> at org.parboiled.MatcherContext.runMatcher(MatcherContext.java:367) ~<span class="error">[parboiled-core-1.1.8.jar:1.1.8]</span><br> at org.parboiled.matchers.SequenceMatcher.match(SequenceMatcher.java:46) ~<span class="error">[parboiled-core-1.1.8.jar:1.1.8]</span><br> at org.parboiled.parserunners.BasicParseRunner.match(BasicParseRunner.java:77) ~<span class="error">[parboiled-core-1.1.8.jar:1.1.8]</span></p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Parboiled parsers are <b>not</b> thread safe - <a href="https://github.com/sirthias/parboiled/wiki/Thread-Safety" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://github.com/sirthias/parboiled/wiki/Thread-Safety</a></p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Yet the MongoDialect uses shared, static parser for native queries - <a href="https://github.com/hibernate/hibernate-ogm/blob/master/mongodb/src/main/java/org/hibernate/ogm/datastore/mongodb/MongoDBDialect.java:" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://github.com/hibernate/hibernate-ogm/blob/master/mongodb/src/main/java/org/hibernate/ogm/datastore/mongodb/MongoDBDialect.java:</a></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">private</span> <span class="code-keyword" style="color: #000091">static</span> <span class="code-keyword" style="color: #000091">final</span> NativeQueryParser NATIVE_QUERY_PARSER = Parboiled.createParser( NativeQueryParser.class );
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">The access to this property is not synchronized.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Wrapping query execution (in the app) in synchronized (globalLock) mitigates this issue instantly and completely - but it hurts performance a lot as no queries can be executed in parallel. </p> </td>
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