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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
    </build-info>


<item>
            <title>[JAVA-2766] DefaultServerMonitor catches Throwable and discards without logging</title>
                <link>https://jira.mongodb.org/browse/JAVA-2766</link>
                <project id="10006" key="JAVA">Java Driver</project>
                    <description>&lt;p&gt;This code ought to at least log subclasses of Error (OOMEs in particular).  Without doing so, there is no way to know that the JVM &quot;got sick&quot; when executing this thread.  Even though the thread itself likely (I didn&apos;t evaluate the control paths) continues to behave correctly, I like to know if my JVMs are having issues.&lt;/p&gt;

&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;   averageRoundTripTime.reset();&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;   currentServerDescription = getConnectingServerDescription(t);&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="491010">JAVA-2766</key>
            <summary>DefaultServerMonitor catches Throwable and discards without logging</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13202">Works as Designed</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="sshabino">Steve Shabino</reporter>
                        <labels>
                    </labels>
                <created>Thu, 1 Feb 2018 18:12:08 +0000</created>
                <updated>Fri, 27 Oct 2023 13:21:09 +0000</updated>
                            <resolved>Fri, 2 Feb 2018 19:21:32 +0000</resolved>
                                    <version>3.6.1</version>
                                                    <component>Monitoring</component>
                                        <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1894137" author="khotov" created="Thu, 17 May 2018 16:07:46 +0000"  >&lt;p&gt;Jeff, thank you, I&apos;ve got it. It seems that this problem indeed is out of the library scope, so you&apos;re right. Now I&apos;ve realized that in my case the &lt;b&gt;-XX:+ExitOnOutOfMemoryError&lt;/b&gt;&#160;flag will resolve all my problems.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;Thank you.&#160;&lt;/p&gt;</comment>
                            <comment id="1893760" author="jeff.yemin" created="Thu, 17 May 2018 13:18:07 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=Khotov&quot; class=&quot;user-hover&quot; rel=&quot;Khotov&quot;&gt;Khotov&lt;/a&gt; are no other threads throwing OutOfMemoryError?&#160; As this try/catch runs in a background thread, there&apos;s no way for the driver to throw it to the application.&lt;/p&gt;</comment>
                            <comment id="1893732" author="khotov" created="Thu, 17 May 2018 12:22:33 +0000"  >&lt;p&gt;@jeff.yemin Hi, Jeff.&lt;/p&gt;


&lt;p&gt;I&apos;ve just found out an&#160;&lt;tt&gt;OutOfMemoryError&lt;/tt&gt; entry in our microservice logs. Unfortunately, the microservice has been still functioning(but not correctly for obvious reasons). This makes me quite unhappy because our ecosystem is configured to restart automatically fallen services, so the expected behavior of the service when it&apos;s got any troubles is to fall. But since the piece of code pointed in the issue swallows the Error, the service doesn&apos;t know about the problem and doesn&apos;t fall.&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;I&apos;m highly confident that exactly this catch block is the source of my problems since I&apos;ve reproduced the OutOfMemoryError occurrence in debug mode.&#160;&#160;&lt;/p&gt;</comment>
                            <comment id="1793702" author="jeff.yemin" created="Fri, 2 Feb 2018 19:21:32 +0000"  >&lt;p&gt;Closing this, but happy to re-open if you find an exception that&apos;s not actually logged.&lt;/p&gt;</comment>
                            <comment id="1792177" author="jeff.yemin" created="Thu, 1 Feb 2018 18:48:09 +0000"  >&lt;p&gt;Except for the one that just catches &lt;tt&gt;MongoSocketException&lt;/tt&gt; in order to retry the connection attempt, the nested catch blocks all re-throw their exceptions.&lt;/p&gt;</comment>
                            <comment id="1792150" author="sshabino" created="Thu, 1 Feb 2018 18:38:02 +0000"  >&lt;p&gt;The logging you pointed out is great, but it only logs Throwables emitted from the two lines in the code block, and not any Throwables originating from the try/catch block immediately above the one you mentioned.&lt;/p&gt;

&lt;p&gt;Obviously, this is a minor concern.  I happened to be reading through this code and thought I&apos;d report it.&lt;/p&gt;</comment>
                            <comment id="1792114" author="jeff.yemin" created="Thu, 1 Feb 2018 18:20:45 +0000"  >&lt;p&gt;The intention is that exceptions are logged in {{com.mongodb.connection.DefaultServerMonitor.ServerMonitorRunnable#logStateChange}].  Here&apos;s an example where a connect failure is logged:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;13:19:03.266 [cluster-ClusterId{value=&apos;5a735a1390b78e75df9810da&apos;, description=&apos;null&apos;}-localhost:27018] INFO  org.mongodb.driver.cluster - Exception in monitor thread while connecting to server localhost:27018&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;com.mongodb.MongoSocketOpenException: Exception opening socket&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	at com.mongodb.connection.SocketChannelStream.open(SocketChannelStream.java:55) ~[mongodb-driver-core-3.7.0-SNAPSHOT.jar:na]&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	at com.mongodb.connection.InternalStreamConnection.open(InternalStreamConnection.java:118) ~[mongodb-driver-core-3.7.0-SNAPSHOT.jar:na]&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	at com.mongodb.connection.DefaultServerMonitor$ServerMonitorRunnable.run(DefaultServerMonitor.java:114) ~[mongodb-driver-core-3.7.0-SNAPSHOT.jar:na]&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	at java.base/java.lang.Thread.run(Thread.java:844) [na:na]&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;Caused by: java.net.ConnectException: Connection refused&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	at java.base/sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) ~[na:na]&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	at java.base/sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717) ~[na:na]&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	at java.base/sun.nio.ch.SocketAdaptor.connect(SocketAdaptor.java:111) ~[na:na]&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	at com.mongodb.connection.SocketStreamHelper.initialize(SocketStreamHelper.java:59) ~[mongodb-driver-core-3.7.0-SNAPSHOT.jar:na]&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	at com.mongodb.connection.SocketChannelStream.open(SocketChannelStream.java:52) ~[mongodb-driver-core-3.7.0-SNAPSHOT.jar:na]&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;	... 3 common frames omitted&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;Have you confirmed in practice that this is an issue for you?  &lt;/p&gt;</comment>
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