Hi,
I have never tried doing it through the executor like that. How I enable
virtual threads in server.xml is like this:
<Connector port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443"
maxParameterCount="1000"
useVirtualThreads="true" />
You should be using at least JDK21 for that to work. When you do a thread dump
you will see virtual threads in the dump.
Extra info FYI: Running with JVM argument -Djdk.tracePinnedThreads=full prints
a complete stack trace when a thread blocks while pinned, with the native
frames and frames holding monitors highlighted. Running with
-Djdk.tracePinnedThreads=short limits the output to just the problematic frames:
Thread[#41,ForkJoinPool-1-worker-4,5,CarrierThreads]
com.mysql.cj.jdbc.ConnectionImpl.isValid(ConnectionImpl.java:2516) <==
monitors:1
Thread[#39,ForkJoinPool-1-worker-2,5,CarrierThreads]
com.mysql.cj.jdbc.ConnectionImpl.isValid(ConnectionImpl.java:2516) <==
monitors:1
Thread[#41,ForkJoinPool-1-worker-4,5,CarrierThreads]
com.mysql.cj.jdbc.ConnectionImpl.setAutoCommit(ConnectionImpl.java:2005)
<== monitors:1
Thread[#43,ForkJoinPool-1-worker-5,5,CarrierThreads]
com.mysql.cj.jdbc.ClientPreparedStatement.executeInternal(ClientPreparedStatement.java:893)
<== monitors:1
com.mysql.cj.jdbc.ClientPreparedStatement.executeUpdateInternal(ClientPreparedStatement.java:1061)
<== monitors:1
com.mysql.cj.jdbc.ClientPreparedStatement.executeUpdateInternal(ClientPreparedStatement.java:1009)
<== monitors:1
Thread[#43,ForkJoinPool-1-worker-5,5,CarrierThreads]
com.mysql.cj.jdbc.ConnectionImpl.commit(ConnectionImpl.java:791) <==
monitors:1
Thread[#43,ForkJoinPool-1-worker-5,5,CarrierThreads]
com.mysql.cj.jdbc.ConnectionImpl.setAutoCommit(ConnectionImpl.java:2005)
<== monitors:1
Regards,
William Crowell
From: COURTAULT Francois <[email protected]>
Date: Monday, November 3, 2025 at 11:05 AM
To: [email protected] <[email protected]>
Subject: Tomcat 10 and virtual thread
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Hello everyone,
Looking at https://tomcat.apache.org/tomcat-10.1-doc/config/executor.html we
can configure Tomcat 10.1.x to use virtual threads
instead of platform threads. Do you confirm ?
The way to do it, as far as I understood, is to:
* first, declare an executor in server.xml like below
<Executor name="virtualThread"
className="org.apache.catalina.core.StandardVirtualThreadExecutor" />
* second, use a connector which will refer this above Executor thanks to
its name attribute.
The way I do it, is to update line 74, in server.xml, from <Connector
port="8080" protocol="HTTP/1.1" to
<Connector executor="virtualThread"
port="8080" protocol="HTTP/1.1"
I started Tomcat and triggered a thread dump.
I was not able to see any tomcat-virt string.
Does it mean that the virtual thread usage is still disabled ?
What's wrong with my configuration ?
Best Regards.
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