{
  "title": "Spring Batch 5.1 Job Execution Structure",
  "description": "Hierarchical structure of the Spring Batch 5.1 domain model centered on job executions. Shows the relationship between jobs, instances, executions, steps, and execution context.",
  "structure": {
    "JobExecution": {
      "description": "Root domain object representing a single run of a batch job.",
      "fields": {
        "id": "Long — unique execution identifier",
        "jobInstance": "JobInstance — the associated job instance",
        "jobParameters": "JobParameters — typed parameters for this execution",
        "status": "BatchStatus enum — COMPLETED, FAILED, STARTED, etc.",
        "exitStatus": "ExitStatus — exit code and description",
        "startTime": "LocalDateTime — execution start timestamp",
        "endTime": "LocalDateTime — execution end timestamp (null if running)",
        "createTime": "LocalDateTime — record creation timestamp",
        "lastUpdated": "LocalDateTime — last modification timestamp",
        "stepExecutions": "Collection<StepExecution> — all step runs",
        "executionContext": "ExecutionContext — persisted job-level state",
        "failureExceptions": "List<Throwable> — exceptions that caused failure",
        "version": "Integer — optimistic locking version"
      },
      "children": {
        "JobInstance": {
          "description": "Uniquely identifies a job by name and parameters.",
          "fields": {
            "id": "Long — unique instance identifier",
            "jobName": "String — Spring Batch job name",
            "instanceId": "Long — synonym for id"
          }
        },
        "StepExecution": {
          "description": "Represents the execution of a single step within the job.",
          "fields": {
            "id": "Long — unique step execution identifier",
            "stepName": "String — step name",
            "status": "BatchStatus enum",
            "exitStatus": "ExitStatus — exit code and description",
            "readCount": "int — items successfully read",
            "writeCount": "int — items successfully written",
            "commitCount": "int — number of chunk commits",
            "rollbackCount": "int — number of chunk rollbacks",
            "readSkipCount": "int — items skipped during read",
            "processSkipCount": "int — items skipped during process",
            "writeSkipCount": "int — items skipped during write",
            "filterCount": "int — items filtered by processor",
            "startTime": "LocalDateTime — step start time",
            "endTime": "LocalDateTime — step end time",
            "executionContext": "ExecutionContext — persisted step-level state",
            "skippedItems": "List<Throwable> — exceptions for skipped items",
            "version": "Integer — optimistic locking version"
          },
          "children": {
            "ExecutionContext": {
              "description": "Key-value store persisted to the job repository for restart support.",
              "fields": {
                "dirty": "boolean — whether context has unsaved changes",
                "entrySet": "Set<Map.Entry<String, Object>> — all context entries"
              }
            }
          }
        }
      }
    }
  }
}