further support for Virtual threads, issues 737

Signed-off-by: Ceki Gulcu <[email protected]>

Author: ceki

logback-classic/src/test/java/ch/qos/logback/classic/util/EnvUtilTest.java

@@ -26,5 +26,4 @@ public void versionTest() {
 
 
 
-
 }

logback-core/src/main/java/ch/qos/logback/core/util/ExecutorServiceUtil.java

@@ -45,7 +45,7 @@ public class ExecutorServiceUtil {
         private final ThreadFactory defaultFactory = makeThreadFactory();
 
         /**
-         * A thread factory which may be a virtual thread factory if available.
+         * A thread factory which may be a virtual thread factory the JDK supports it.
          *
          * @return
          */

logback-core/src/test/java/ch/qos/logback/core/util/EnvUtilTest.java

@@ -39,8 +39,11 @@ public void jdkVersion() {
         Assertions.assertEquals(9, EnvUtil.getJDKVersion("9EA"));
         Assertions.assertEquals(9, EnvUtil.getJDKVersion("9.0.1"));
         Assertions.assertEquals(18, EnvUtil.getJDKVersion("18.3+xx"));
+        Assertions.assertEquals(21, EnvUtil.getJDKVersion("21.0.1"));
     }
 
+
+
     @Test
     public void testJava1_4() {
         System.setProperty("java.version", "1.4.xx");