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Add spring-batch: jobs, steps, chunk processing and restartability on Boot 4.1

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Companion code for "Spring Batch on Boot 4.1: Jobs, Steps, Chunk Processing and
Restartability". A productImportJob configured three ways by profile against a
poisoned CSV row, run as real java -jar processes (not just JUnit) so the
restart story is genuine: a chunk fails and rolls back, the process exits, a
brand-new JVM against the same file-based H2 database resumes at the exact
next unread row (READ_COUNT 20, not 60) and completes.

Findings the build pins:
- StepBuilder.chunk(int, PlatformTransactionManager) still compiles in Batch
  6.0.5 but returns the legacy SimpleStepBuilder; chunk(int) returns the new
  ChunkOrientedStepBuilder, and only the latter is used here.
- Two different ExecutionContext classes now exist in two different packages
  (infrastructure.item vs core.repository.persistence) with different shapes.
- spring-boot-starter-batch alone gives a resourceless JobRepository that
  forgets every JobInstance the moment the JVM exits; spring-boot-starter-
  batch-jdbc is what makes the restart demo possible at all, demonstrated by
  excluding BatchJdbcAutoConfiguration and watching a "restart" collide with
  the previous run's own data instead of resuming it.
- A migration-guide summary claiming CommandLineJobRunner was removed in 6.0
  is wrong -- javap against the real jar shows @Deprecated(forRemoval=true),
  not removed.
- RepeatStatus moved from core.repeat to infrastructure.repeat, caught by the
  compiler rather than by reading docs.

11 documentation chapters, 10 captured transcripts (unit tests, javap output,
and real two-JVM scenario runs), all regenerated by scripts/run-all.sh.

Fixed after push: three dead docs.spring.io links in the doc chapters
(readersAndWriters/* and chunk-oriented-processing/*.html paths moved when
Spring Batch 6 reorganized its reference docs; corrected to the current
readers-and-writers/*, processor.html and chunk-oriented-processing.html
paths, verified 200 via curl before committing).

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_019DXsJ1zpikbA1MQJN6RqFA
This commit is contained in:
Claude
2026-09-13 06:37:46 +00:00
parent a9867c0423
commit b81af72bc3
40 changed files with 2001 additions and 0 deletions
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spring-batch/docs/output/03-stepbuilder-chunk-overloads.txt
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# javap org.springframework.batch.core.step.builder.StepBuilder (spring-batch-core 6.0.5)
$ javap -cp spring-batch-core-6.0.5.jar org.springframework.batch.core.step.builder.StepBuilder
Compiled from "StepBuilder.java"
public class org.springframework.batch.core.step.builder.StepBuilder extends org.springframework.batch.core.step.builder.StepBuilderHelper<org.springframework.batch.core.step.builder.StepBuilder> {
public org.springframework.batch.core.step.builder.StepBuilder(org.springframework.batch.core.repository.JobRepository);
public org.springframework.batch.core.step.builder.StepBuilder(java.lang.String, org.springframework.batch.core.repository.JobRepository);
public org.springframework.batch.core.step.builder.TaskletStepBuilder tasklet(org.springframework.batch.core.step.tasklet.Tasklet, org.springframework.transaction.PlatformTransactionManager);
public org.springframework.batch.core.step.builder.TaskletStepBuilder tasklet(org.springframework.batch.core.step.tasklet.Tasklet);
public <I, O> org.springframework.batch.core.step.builder.SimpleStepBuilder<I, O> chunk(int, org.springframework.transaction.PlatformTransactionManager);
public <I, O> org.springframework.batch.core.step.builder.ChunkOrientedStepBuilder<I, O> chunk(int);
public <I, O> org.springframework.batch.core.step.builder.SimpleStepBuilder<I, O> chunk(org.springframework.batch.infrastructure.repeat.CompletionPolicy, org.springframework.transaction.PlatformTransactionManager);
public org.springframework.batch.core.step.builder.PartitionStepBuilder partitioner(java.lang.String, org.springframework.batch.core.partition.Partitioner);
public org.springframework.batch.core.step.builder.PartitionStepBuilder partitioner(org.springframework.batch.core.step.Step);
public org.springframework.batch.core.step.builder.JobStepBuilder job(org.springframework.batch.core.job.Job);
public org.springframework.batch.core.step.builder.FlowStepBuilder flow(org.springframework.batch.core.job.flow.Flow);
protected org.springframework.batch.core.step.builder.StepBuilder self();
protected org.springframework.batch.core.step.builder.StepBuilderHelper self();
}