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Spring Boot JDBC Transaction Rollback not working

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I have a large project that  uses plain jdbc to store data in a H2 DB. All is working fine except transaction rollback does not work.
Because the project is very big I made a smaller project with a similar setup to reproduce the behavior.

This is the pom

The controller:

A service:

And two DAOs:

In the second DAO I deliberately throw a RuntimeException to trigger the Rollback, that does not work.

And finally this is the Configuration class:

The value of spring.datasource.h2.db.url is:

So it's not an In-Memory-DB, but a file.

Now when I run the application and call the controller the output looks like this:

So the log says in line 30 to 39 that the transaction rolls back, but when i look into the db tables the BlogPost record still gets written.
In other projects where i used JPA and Spring Data JPA the @Transaction annotation always worked fine, but in this project i can't get it running, because I don' know this kind of project setup.

I hope here someone knows where the problem is!

Thanks in advance,
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