$ javap (Batch 6.0.5 jars), selected lines
public interface core.launch.JobOperator extends core.launch.JobLauncher {
public interface core.repository.JobRepository extends core.repository.explore.JobExplorer {
public class test.JobOperatorTestUtils extends test.JobLauncherTestUtils {
  public <I, O> core.step.builder.SimpleStepBuilder<I, O> chunk(int, PlatformTransactionManager);
  public <I, O> core.step.builder.ChunkOrientedStepBuilder<I, O> chunk(int);
  public <I, O> core.step.builder.SimpleStepBuilder<I, O> chunk(infrastructure.repeat.CompletionPolicy, PlatformTransactionManager);
  public default void beforeChunk(core.scope.context.ChunkContext);
  public default void afterChunk(core.scope.context.ChunkContext);
  public default void afterChunkError(core.scope.context.ChunkContext);
  public default void beforeChunk(infrastructure.item.Chunk<I>);
  public default void afterChunk(infrastructure.item.Chunk<O>);
  public default void onChunkError(java.lang.Exception, infrastructure.item.Chunk<O>);