When to use Spring @Transactional (propagation = Propagation.SUPPORTS)?

java spring jakarta-ee ejb
ams picture ams · Feb 27, 2013 · Viewed 21.3k times · Source

According to the Spring javadoc @Transactional(propagation = Propagation.SUPPORTS)

Support a current transaction, execute non-transactionally if none exists. Analogous to EJB transaction attribute of the same name.

It seems that I can just declare methods non transactionaly and be just done with it so my questions are.

  • What are some situations where SUPPORTS propagation is needed?
  • What is the point of the Supports propagation?

Can anyone give a real world example / scenario where SUPPORTS was actually useful?

Answer

Affe picture Affe · Feb 27, 2013

Easiest example I can think of would be a method that sends some content to a JMS server. If you are in the context of a transaction, you want the message to be coupled to the transaction scope. But if there isn't already a transaction running, why bother calling the transaction server also and starting one just to do a one-off message?

Remember these can be declared on an API as well as an implementation. So even if there isn't much difference for your use case between putting it there and putting nothing there, it still adds value for an API author to specify what operations are able to be included in a transaction, as opposed to operations that perhaps call an external system that does not participate in transactions.

This is of course in a JTA context. The feature doesn't really have much practical use in a system where transactions are limited to resource-local physical database transactions.

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