Add support for Spring Batch MongoDB

[philwebb]

Sample at https://github.com/joshlong-attic/2024-11-20-batch-job-repository

[philwebb]

This bug exists in earlier versions, but given it's mostly going to be triggered by the new MongoJobRepositoryFactoryBean I think we should keep the target to 3.4

[philwebb]

The sample now appears to start if:

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-batch</artifactId>
			<exclusions>
				<exclusion>
					<groupId>org.springframework.boot</groupId>
					<artifactId>spring-boot-starter-jdbc</artifactId>
				</exclusion>
			</exclusions>
		</dependency>

and

	@Bean
	MongoTransactionManager mongoTransactionManager(MongoDatabaseFactory dbf) {
		return new MongoTransactionManager(dbf);
	}

[philwebb]

@mbhave pointed out that BatchAutoConfiguration depends on DataSource so it may back off entirely with the pring-boot-starter-jdbc exclusion. We probably need a more complete fix for Mongo support.

That might need to wait until 3.5, in which case we could revert my "fix" in 3.4

[wilkinsona]

Chatting with @fmbenhassine, this may need to wait for Spring Boot 4.0/Spring Batch 6.0 to allow some breaking changes to be made, such as DefaultBatchConfiguration losing its DataSource assumptions.