code: public void start(SessionContextRegistry scr) {
          if (TraceComponent.isAnyTracingEnabled() && LoggingUtil.SESSION_LOGGER_CORE.isLoggable(Level.FINE)) {
              LoggingUtil.SESSION_LOGGER_CORE.entering(methodClassName, "start");
          }
          this.initialize();
          scr.setPropertiesInSMC(serverLevelSessionManagerConfig);
          if (TraceComponent.isAnyTracingEnabled() && LoggingUtil.SESSION_LOGGER_CORE.isLoggable(Level.FINE)) {
              // Prints server level config
              serverLevelSessionManagerConfig.printSessionManagerConfigForDebug(LoggingUtil.SESSION_LOGGER_CORE);
              LoggingUtil.SESSION_LOGGER_CORE.exiting(methodClassName, "start");
          }
      }
docs: /*
  Service start call