Trigger GC logs programmatically

TriggerGcLogsProgrammatically.java

import javax.management.InstanceNotFoundException;
import javax.management.IntrospectionException;
import javax.management.MBeanException;
import javax.management.MBeanInfo;
import javax.management.MalformedObjectNameException;
import javax.management.ObjectName;
import javax.management.ReflectionException;
import java.lang.management.ManagementFactory;

public class TriggerGcLogsProgrammatically {
    public static void main(String[] args) throws Exception {
//        Arrays.stream(describeDiagnosticCommands().getOperations())
//              .map(op -> op.getName() + " -> \n" + op.toString())
//              .forEach(System.out::println);

        System.out.printf("%s%n %s%n", "jcmd $(pidof java) VM.log what=gc*=debug decorators=uptime,tags,level output=stderr",
                          executeDiagnosticCommand(
                                 "vmLog",
                                 "what=gc*=trace",
                                 "decorators=uptime,tags,level",
                                 "output=stderr"));
        
        System.out.printf("%s%n %s%n", "jcmd $(pidof java) VM.log list",
                          executeDiagnosticCommand(
                                 "vmLog",
                                 "list"));
    }


    private static String executeDiagnosticCommand(String operationName, String... params) throws MalformedObjectNameException, InstanceNotFoundException, MBeanException, ReflectionException {
        var objectName = new ObjectName("com.sun.management:type=DiagnosticCommand");
        var mbeanServer = ManagementFactory.getPlatformMBeanServer();

        String[] signature = new String[]{String[].class.getName()};

        return (String) mbeanServer.invoke(objectName,
                                           operationName,
                                           new Object[]{params},
                                           signature);
    }

    private static MBeanInfo describeDiagnosticCommands() throws IntrospectionException, InstanceNotFoundException, ReflectionException, MalformedObjectNameException {
        var objectName = new ObjectName("com.sun.management:type=DiagnosticCommand");
        var mbeanServer = ManagementFactory.getPlatformMBeanServer();

        return mbeanServer.getMBeanInfo(objectName);
    }
}