I want to read from 4 database tables using JDBC Inbound Adapters with polling. Each JDBC Inbound Adapter serves as the starting point of one of my 4 integration flows. Each flow is independent of the others.
My question is: Is it possible to have multiple integration flows, each with its own JDBC Inbound Channel Adapter, in Spring Integration?
Yes. You can do that. Spring projects are designed for enterprise in mind. Therefore you indeed can have multi-thread solution.
Not clear why have you raised the question before trying that yourself.
Either way, keep in mind that Spring Boot auto-configure a TaskScheduler with one thread in its pool by default: https://docs.spring.io/spring-boot/reference/features/task-execution-and-scheduling.html#page-title. So, you may think about increasing that pool size. All the polling channel adapters rely on that TaskScheduler for their polling tasks: https://docs.spring.io/spring-integration/reference/channel-adapter.html#channel-adapter-namespace-inbound