Call WhiteBox::fullGC() for class unloading

reinrich · Jan 15, 2025 · 9e524f9 · 9e524f9
1 parent 2810d72
commit 9e524f9
Showing 1 changed file with 12 additions and 2 deletions.
diff --git a/test/jdk/java/lang/String/concat/HiddenClassUnloading.java b/test/jdk/java/lang/String/concat/HiddenClassUnloading.java
@@ -26,13 +26,20 @@
 import java.lang.invoke.*;
 import java.lang.management.ManagementFactory;
 
+import jdk.test.whitebox.WhiteBox;
+
 /**
  * @test
  * @summary Test whether the hidden class unloading of StringConcatFactory works
  *
+ * @library /test/lib
+ * @build jdk.test.whitebox.WhiteBox
+ * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
  * @requires vm.flagless
- * @run main/othervm -Xmx8M -Xms8M -Xverify:all HiddenClassUnloading
- * @run main/othervm -Xmx8M -Xms8M -Xverify:all -XX:-CompactStrings HiddenClassUnloading
+ * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
+ *                   -Xverify:all HiddenClassUnloading
+ * @run main/othervm -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -Xbootclasspath/a:.
+ *                   -Xverify:all -XX:-CompactStrings HiddenClassUnloading
  */
 public class HiddenClassUnloading {
     public static void main(String[] args) throws Throwable {
@@ -61,6 +68,9 @@ public static void main(String[] args) throws Throwable {
             );
         }
 
+        // Request GC which performs class unloading
+        WhiteBox.getWhiteBox().fullGC();
+
         long unloadedClassCount = ManagementFactory.getClassLoadingMXBean().getUnloadedClassCount();
         if (initUnloadedClassCount == unloadedClassCount) {
             throw new RuntimeException("unloadedClassCount is zero");