TestMemoryPools.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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/**
 * @test TestMemoryPools
 * @summary Test JMX memory pools
 * @requires vm.gc.Shenandoah
 * @modules java.base/jdk.internal.misc
 *          java.management
 * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx1g -Xms1g TestMemoryPools
 */

import java.lang.management.*;
import java.util.*;

public class TestMemoryPools {

    public static void main(String[] args) throws Exception {
        List<MemoryManagerMXBean> mms = ManagementFactory.getMemoryManagerMXBeans();
        if (mms == null) {
            throw new RuntimeException("getMemoryManagerMXBeans is null");
        }
        if (mms.isEmpty()) {
            throw new RuntimeException("getMemoryManagerMXBeans is empty");
        }
        for (MemoryManagerMXBean mmBean : mms) {
            String[] names = mmBean.getMemoryPoolNames();
            if (names == null) {
                throw new RuntimeException("getMemoryPoolNames() is null");
            }
            if (names.length == 0) {
                throw new RuntimeException("getMemoryPoolNames() is empty");
            }
            for (String name : names) {
                if (name == null) {
                    throw new RuntimeException("pool name is null");
                }
                if (name.length() == 0) {
                    throw new RuntimeException("pool name is empty");
                }
            }
        }
    }
}