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/*
* @test
* @bug 6305746
* @summary Test that the null values returned by the ThreadMXBean work.
* @author Eamonn McManus
* @run clean ThreadMXBeanTest
* @run build ThreadMXBeanTest
* @run main ThreadMXBeanTest
*/
import java.lang.management.*;
import java.util.*;
import javax.management.*;
public class ThreadMXBeanTest {
public static void main(String[] args) throws Exception {
MBeanServer mbs = MBeanServerFactory.newMBeanServer();
ThreadMXBean tmb = ManagementFactory.getThreadMXBean();
StandardMBean smb = new StandardMBean(tmb, ThreadMXBean.class, true);
ObjectName on = new ObjectName("a:type=ThreadMXBean");
mbs.registerMBean(smb, on);
ThreadMXBean proxy = JMX.newMXBeanProxy(mbs, on, ThreadMXBean.class);
long[] ids1 = proxy.getAllThreadIds();
// Add some random ids to the list so we'll get back null ThreadInfo
long[] ids2 = new long[ids1.length + 10];
System.arraycopy(ids1, 0, ids2, 0, ids1.length);
Random r = new Random();
for (int i = ids1.length; i < ids2.length; i++)
ids2[i] = Math.abs(r.nextLong());
// Following line produces an exception if null values not handled
ThreadInfo[] info = proxy.getThreadInfo(ids2);
boolean sawNull = false;
for (ThreadInfo ti : info) {
if (ti == null)
sawNull = true;
}
if (!sawNull)
throw new Exception("No null value in returned array");
System.out.println("TEST PASSED");
}
}