List<JobInstance> jobInstances = jobExplorer.getJobInstances(jobName);

for (JobInstance jobInstance : jobInstances) {
    List<JobExecution> jobExecutions = jobExplorer.getJobExecutions(jobInstance);
    for (JobExecution jobExecution : jobExecutions) {
        if (//jobExecution.getWhatever...)) {
        // do your thing...
        }
     }
}

List<JobInstance> lastExecutedJobs = jobExplorer.getJobInstances(jobName, 0, Integer.MAX_VALUE);

Optional<JobExecution> jobExecution = lastExecutedJobs
                                .stream()
                                .map(jobExplorer()::getJobExecutions)
                                .flatMap(jes -> jes.stream())
                                .filter(je -> BatchStatus.COMPLETED.equals(je.getStatus()))
                                .findFirst();