Lucee 7 and Tomcat's virtual threads

dswitzer · January 22, 2026, 3:56pm

Just curious if Lucee 7 has been tested with Tomcat’s virtual threads (i.e. Project Loom) enabled on the connector. While it seems like it could speed things up, I’ve read that your code should avoid synchronized blocks and use ReentrantLock to prevent thread pinning.

I haven’t reviewed the Lucee 7 code, but I know previously synchronized blocks were highly used.

Just wonder if there’s been any real testing with actively enabling virtual threads w/Lucee 7.

Zackster · January 23, 2026, 9:22am

Lucee 7 has support but current disabled

github.com

lucee/Lucee/blob/7.0/core/src/main/java/lucee/runtime/thread/ThreadUtil.java#L57


      
          import lucee.runtime.config.Config;
          import lucee.runtime.config.ConfigWeb;
          import lucee.runtime.config.Constants;
          import lucee.runtime.net.http.HTTPServletRequestWrap;
          import lucee.runtime.net.http.HttpServletRequestDummy;
          import lucee.runtime.net.http.HttpServletResponseDummy;
          import lucee.runtime.type.Struct;
          
          public final class ThreadUtil {
          
          	private static final boolean ALLOW_FUTURE_THREADS = false;
          	// private static final Class<?> THREAD_CLASS = Thread.class;
          	private static final Class<?> RUNNABLE_CLASS = Runnable.class;
          	private static Class<?> threadBuilderClass;
          	private static boolean virtualDisabled = false;
          
          	public static Class<?> getThreadBuilderClass() throws ClassNotFoundException {
          		if (threadBuilderClass == null) {
          			threadBuilderClass = Class.forName("java.lang.Thread$Builder$OfVirtual");
          		}
          		return threadBuilderClass;

The war on synchronized has been underway for several years

dswitzer · January 23, 2026, 3:28pm

Should I disable it my Tomcat config, or leave it enabled so that when Lucee does enable support it’s used?

From what I’ve read, it would seem I need to disable it Tomcat to be safe, but want to confirm before I finalize my provisioning scripts.

Zackster · January 23, 2026, 3:46pm

If you use java 24 or java 25, theoretically it should be fine, which version are you using

haven’t heard any bug reports?

dswitzer · January 23, 2026, 4:12pm

Right now, testing with Java 21.