Partitioned step is not re-executed when Exception was thrown in Partitioner

[sbklahr]

Bug description

A partitioned Step fails if an Exception is thrown from Partitioner.partition(). On retry Partitioner.partition() does not throw an exception and returns a valid partition map, but the partitioned Step does not run.

Environment
Spring Batch 5.1.2

Steps to reproduce

Define a partitioned step like this:

return new StepBuilder("partitionStep", jobRepository)
                .partitioner("myPartitioner", myPartitioner)
                .step(myStep)
                .gridSize(10)
                .build();

Implement a custom myPartitioner. It is possible that an Exception ist thrown from its partition() method.

After the retry the contents of BATCH_STEP_EXECUTION looks like this

• STEP_NAME: partitionStep, JOB_EXECUTION_ID: 1, EXIT_CODE: FAILED
• STEP_NAME: partitionStep, JOB_EXECUTION_ID: 2, EXIT_CODE: COMPLETED

Expected behavior
myStep should be executed on retry. After the retry the contents of BATCH_STEP_EXECUTION should look like this

• STEP_NAME: partitionStep, JOB_EXECUTION_ID: 1, EXIT_CODE: FAILED
• STEP_NAME: partitionStep, JOB_EXECUTION_ID: 2, EXIT_CODE: COMPLETED
• STEP_NAME: myStep:partition-0, JOB_EXECUTION_ID: 2, EXIT_CODE: COMPLETED
• STEP_NAME: myStep:partition-1, JOB_EXECUTION_ID: 2, EXIT_CODE: COMPLETED
• ...