7196045: Possible JVM deadlock in ThreadTimesClosure when using HotspotInternal non-public API.
Reviewed-by: sspitsyn, dholmes
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/*
* @test
* @bug 7196045
* @summary Possible JVM deadlock in ThreadTimesClosure when using HotspotInternal non-public API.
* @run main/othervm
*/
import java.lang.management.ManagementFactory;
import javax.management.JMException;
import javax.management.MBeanServer;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;
public class Test7196045 {
public static long duration = 1000 * 60 * 2;
private static final String HOTSPOT_INTERNAL = "sun.management:type=HotspotInternal";
public static void main(String[] args) {
MBeanServer server = ManagementFactory.getPlatformMBeanServer();
ObjectName objName= null;
try {
ObjectName hotspotInternal = new ObjectName(HOTSPOT_INTERNAL);
try {
server.registerMBean(new sun.management.HotspotInternal(), hotspotInternal);
} catch (JMException e) {
throw new RuntimeException("HotSpotWatcher: Failed to register the HotspotInternal MBean" + e);
}
objName= new ObjectName("sun.management:type=HotspotThreading");
} catch (MalformedObjectNameException e1) {
throw new RuntimeException("Bad object name" + e1);
}
long endTime = System.currentTimeMillis() + duration;
long i = 0;
while (true) {
try {
server.getAttribute(objName, "InternalThreadCpuTimes");
} catch (Exception ex) {
System.err.println("Exception while getting attribute: " + ex);
}
i++;
if (i % 10000 == 0) {
System.out.println("Successful iterations: " + i);
}
if (System.currentTimeMillis() > endTime) {
break;
}
}
System.out.println("PASSED.");
}
}