HotSpotDiagnosticMXBean

public final class HeapDumpUtil {

    private HeapDumpUtil() {
        throw new AssertionError();
    }

    public static File heapDump() {
        String uniqueFileName = OssUtil.generateUniqueFileName(LocalDateTime.now(), "heap_dump.hprof");
        String dumpFilePath = Constants.TMP_DIR_PATH + File.separator + uniqueFileName;

        try {
            ManagementFactory.getPlatformMXBean(HotSpotDiagnosticMXBean.class).dumpHeap(dumpFilePath, true);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

        return new File(dumpFilePath);
    }

}

References

HotSpotDiagnosticMXBean (Monitoring and Management Interface for the Java Platform )
Using the Platform MBean Server and Platform MXBeans - JavaSE Monitoring and Management Guide