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 */

/*

 * @test

 * @key stress

 *

 * @summary converted from VM Testbase nsk/monitoring/stress/lowmem/lowmem035.

 * VM Testbase keywords: [stress, monitoring, nonconcurrent]

 * VM Testbase readme:

 * DESCRIPTION

 *     The test checks that enabling of low memory detection does not lead to

 *     unexpected behaviour: crashes of the VM and undocumented exceptions.

 *     The test enables low memory detection: it adds NotificationListener

 *     to the MemoryMBean for notification mechanism of monitoring, or starts

 *     a special thread for polling mechanism. After that, it starts eating memory.

 *     Objects are allocated, if "heap" memory is tested; classes are loaded,

 *     if "nonheap" memory is tested; objects are allocated and classes are

 *     loaded, if "mixed" memory is tested.

 *     Notifications are received by the listener in notification mechanism and

 *     crossing of thresholds are detected in polling mechanism. The thresholds

 *     are updated as soon as notification is received, or crossing of a threshold

 *     is detected.

 *     The test also checks stderr to be empty. Otherwise, it fails. The test

 *     exits as soon as OutOfMemoryError is caught (if heap memory is tested) or

 *     all classes are loaded (if nonheap or mixed memory is tested).

 *     All options of the test are specified in *.cfg file. this particular test

 *         - performs access to the MBeans' method through default MBeanServer;

 *         - fills both heap and nonheap memory;

 *         - implements polling mechanism of monitoring;

 *         - tests collection usage thresholds.

 * COMMENTS

 *     Fixed the bug

 *     4969687 TEST_BUG: The spec is updated accoring to 4956978, 4957000, 4959889

 *

 * @library /vmTestbase

 *          /test/lib

 * @run driver jdk.test.lib.FileInstaller . .

 * @run main/othervm

 *      -XX:-UseGCOverheadLimit

 *      nsk.monitoring.stress.lowmem.lowmem001

 *      -testMode=server

 *      -memory=mixed

 *      -monitoring=polling

 *      -threshold=collection

 */