Java 21

.idea/gradle.xml

···
   <component name="GradleSettings">
     <option name="linkedExternalProjectsSettings">
       <GradleProjectSettings>
-        <option name="distributionType" value="DEFAULT_WRAPPED" />
         <option name="externalProjectPath" value="$PROJECT_DIR$" />
         <option name="modules">
           <set>

.idea/misc.xml

···
   <component name="FrameworkDetectionExcludesConfiguration">
     <file type="web" url="file://$PROJECT_DIR$" />
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="17" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="21" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/classes" />
   </component>
 </project>

build.gradle

···
 
 description = 'Velocity queueing solution'
 
-java.sourceCompatibility = JavaVersion.VERSION_17
-java.targetCompatibility = JavaVersion.VERSION_17
+java.sourceCompatibility = JavaVersion.VERSION_21
+java.targetCompatibility = JavaVersion.VERSION_21
 
 tasks {
     processResources {