code: public void prepareForExecution(JobContextImpl jobContext, String restartOn) {
  		this.jobContext = jobContext;
  		this.jobNavigator = jobContext.getNavigator();
  		jobContext.setExecutionId(executionId);
  		jobContext.setInstanceId(jobInstance.getInstanceId());
  		this.restartOn = restartOn;
  		operatorJobExecution.setJobContext(jobContext);
  	}
docs: /*
  Non-spec'd methods (not on the interface, but maybe we should
  put on a second interface).