8157957: ClassNotFoundException: jdk.test.lib.JDKToolFinder
Reviewed-by: coleenp, gtriantafill, mseledtsov, iignatyev, dholmes, dsamersoff
/*
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/*
* @test KeepAliveClassLoader
* @summary This test case uses a java.lang.ClassLoader instance to keep a class alive.
* @modules java.base/jdk.internal.misc
* @library /test/lib /runtime/testlibrary
* @library classes
* @build sun.hotspot.WhiteBox test.Empty
* @run main ClassFileInstaller sun.hotspot.WhiteBox
* sun.hotspot.WhiteBox$WhiteBoxPermission
* @run main/othervm -Xbootclasspath/a:. -Xmn8m -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI KeepAliveClassLoader
*/
import sun.hotspot.WhiteBox;
/**
* Test that verifies that classes are not unloaded when specific types of references are kept to them.
*/
public class KeepAliveClassLoader {
private static final String className = "test.Empty";
private static final WhiteBox wb = WhiteBox.getWhiteBox();
public static Object escape = null;
public static void main(String... args) throws Exception {
ClassLoader cl = ClassUnloadCommon.newClassLoader();
Class<?> c = cl.loadClass(className);
Object o = c.newInstance();
o = null; c = null;
escape = cl;
{
boolean isAlive = wb.isClassAlive(className);
System.out.println("testClassLoader (1) alive: " + isAlive);
ClassUnloadCommon.failIf(!isAlive, "should be alive");
}
ClassUnloadCommon.triggerUnloading();
{
boolean isAlive = wb.isClassAlive(className);
System.out.println("testClassLoader (2) alive: " + isAlive);
ClassUnloadCommon.failIf(!isAlive, "should be alive");
}
cl = null;
escape = null;
ClassUnloadCommon.triggerUnloading();
{
boolean isAlive = wb.isClassAlive(className);
System.out.println("testClassLoader (3) alive: " + isAlive);
ClassUnloadCommon.failIf(isAlive, "should be unloaded");
}
}
}