Week 24 — What is the `RuntimeMXBean? in Java? | Java Community | Help. Code. Learn. | Page 1

RuntimeMXBean is a Java class part of the java.management module (which provides methods for managing JVMs/running Java applications) and allows inspecting information about a JVM. This is possible for the current JVM but also other JVMs.
A RuntimeMXBean for the current JVM can be obtained using ManagementFactory.getRuntimeMXBean():

RuntimeMXBean bean = ManagementFactory.getRuntimeMXBean();

//general JVM information
String vmName = bean.getVmName();
String vendorName = bean.getVmVendor();
String version = bean.getVmVersion();

//information about the spec implemented by the JVM
String specName = bean.getSpecName();
String specVersion = bean.getSpecVersion();

//implementation of the current process
String runningJvmName = bean.getName();
long pid = bean.getPid();//process id

long startTimeMillis = bean.getStartTime();//timestamp when the JVM has started
LocalDateTime startTime = LocalDateTime.ofInstant(Instant.ofEpochMilli(startTimeMillis), ZoneId.systemDefault());
long uptime = bean.getUptime();//time the JVM is running (in milliseconds)

List<String> inputArguments = bean.getInputArguments();//arguments provided via the CLI

System.out.printf("""
  Running on
    %s
    from %s
    version %s (implementing %s version %s)
  since %s (running for %d milliseconds)
  with arguments "%s"
  on JVM process %s (process id %d)
  """, vmName, vendorName, version, specName, specVersion,
  String.valueOf(startTime), uptime,
  inputArguments.stream().collect(Collectors.joining(" ")),
  runningJvmName, pid);

Submission from dan1st#7327

it is a type of MBean that references only a predefined set of data types

Submission from Denis Z.#0177

#Week 24 — What is the `RuntimeMXBean? in Java?