Can't wrap JobRepository in a tracing representation

[marcingrzejszczak]

The problem

I can't wrap the JobRepository used by JobBuilderFactory or StepBuilderFactory, the default one is being used.

Same type of a problem as presented here #816 .

related Sleuth code:
https://github.com/spring-cloud/spring-cloud-sleuth/blob/issues_%231904_batch_with_job_repository/spring-cloud-sleuth-autoconfigure/src/main/java/org/springframework/cloud/sleuth/autoconfig/instrument/batch/TraceBatchAutoConfiguration.java#L57-L60

Implementation issues

AbstractBatchConfiguration creates JobBuilderFactory and StepBuilderFactory as fields.

	@Override
	public void afterPropertiesSet() throws Exception {
		this.jobBuilderFactory = new JobBuilderFactory(jobRepository());
		this.stepBuilderFactory = new StepBuilderFactory(jobRepository(), transactionManager());
	}

JobRepository is being injected directly to it from the method bean defitinion

	@Bean
	public abstract JobRepository jobRepository() throws Exception;

Potential solutions

• do not expose the bean unconditionally
• inject any JobRepository not the concrete one
• do not create JobBuilderFactory nor StepBuilderFactory via new.

[fmbenhassine]

Resolved with #3942 .