GetVMOption.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * 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
 * @bug     6314913
 * @summary Basic Test for HotSpotDiagnosticMXBean.getVMOption()
 * @author  Mandy Chung
 *
 * @run main/othervm -XX:+HeapDumpOnOutOfMemoryError GetVMOption
 */

import com.sun.management.HotSpotDiagnosticMXBean;
import com.sun.management.VMOption;
import java.lang.management.ManagementFactory;
import java.util.List;
import javax.management.MBeanServer;

public class GetVMOption {
    private static final String HEAP_DUMP_ON_OOM = "HeapDumpOnOutOfMemoryError";
    private static final String EXPECTED_VALUE = "true";
    private static final String BAD_OPTION = "BadOption";
    private static final String HOTSPOT_DIAGNOSTIC_MXBEAN_NAME =
        "com.sun.management:type=HotSpotDiagnostic";

    public static void main(String[] args) throws Exception {
        List<HotSpotDiagnosticMXBean> list =
            ManagementFactory.getPlatformMXBeans(HotSpotDiagnosticMXBean.class);
        HotSpotDiagnosticMXBean mbean = list.get(0);
        checkVMOption(mbean);

        MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
        mbean = ManagementFactory.newPlatformMXBeanProxy(mbs,
                    HOTSPOT_DIAGNOSTIC_MXBEAN_NAME,
                    HotSpotDiagnosticMXBean.class);
        checkVMOption(mbean);
    }

    private static void checkVMOption(HotSpotDiagnosticMXBean mbean) {
        VMOption option = mbean.getVMOption(HEAP_DUMP_ON_OOM);
        if (!option.getValue().equalsIgnoreCase(EXPECTED_VALUE)) {
            throw new RuntimeException("Unexpected value: " +
                option.getValue() + " expected: " + EXPECTED_VALUE);
        }
        boolean iae = false;
        try {
            mbean.getVMOption(BAD_OPTION);
        } catch (IllegalArgumentException e) {
            iae = true;
        }
        if (!iae) {
            throw new RuntimeException("Invalid VM Option" +
                " was not detected");
        }
    }
}