Enable parallel Felix bundle resolution with virtual threads

Author: michaeloffner

loader/build.xml

@@ -2,7 +2,7 @@
 <project default="core" basedir="." name="Lucee" 
   xmlns:resolver="antlib:org.apache.maven.resolver.ant">
 
-  <property name="version" value="7.0.5.38-RC"/>
+  <property name="version" value="7.0.5.39-RC"/>
 
   <taskdef uri="antlib:org.apache.maven.resolver.ant" resource="org/apache/maven/resolver/ant/antlib.xml">
     <classpath>

loader/pom.xml

@@ -3,7 +3,7 @@
 
   <groupId>org.lucee</groupId>
   <artifactId>lucee</artifactId>
-  <version>7.0.5.38-RC</version>
+  <version>7.0.5.39-RC</version>
   <packaging>jar</packaging>
 
   <name>Lucee Loader Build</name>

loader/src/main/java/lucee/loader/engine/CFMLEngineFactory.java

@@ -817,11 +817,13 @@ public Felix getFelix(final File resourceRootDir, Map<String, Object> config) th
 		extend(config, "felix.service.urlhandlers", null, false);
 		extend(config, "felix.startlevel.bundle", null, false);
 
-		int processors = Runtime.getRuntime().availableProcessors();
-		String parallelism = Math.max(4, processors * 2) + ""; // Use more threads
-		extend(config, "felix.resolver.parallelism", parallelism, false);
-		extend(config, "felix.resolver.parallel", "true", false); // Enable parallel resolution
-		extend(config, "felix.systembundle.activators.start.parallelism", parallelism, false);
+		// Felix bundle resolution parallelism: enable parallel resolution with virtual threads.
+		// With virtual threads (Java 21+), parallelism is now beneficial for dependency graph traversal.
+		// Default: Math.min(CPU cores, 8) to balance parallelism without excessive lock contention.
+		// Override via -Dfelix.resolver.parallelism=N
+		int parallelism = Math.min(Math.max(1, Runtime.getRuntime().availableProcessors()), 8);
+		extend(config, "felix.resolver.parallelism", "" + parallelism, false);
+		extend(config, "felix.resolver.parallel", "true", false);
 
 		// Skip waiting for service events to be delivered
 		extend(config, "felix.service.timeout", null, false);