The latest Spring boot 3.5 dependencies like webflux includes dependencies to jackson but it is in jackson 2.19.4. As I understand it is not compatible the Jackson version used for Flyway.

I found no way to fix it without reverting Flyway version.

It can easily ne reproduced by creating an new spring boot project with start.spring.io with webflux, flyway and H2, upgrading flyway version, and using Flyway in the default test:

@SpringBootTest
class DemoApplicationTests {
	@BeforeEach
	void initDb(){
		String url = "jdbc:h2:mem:test";
		Flyway flyway = Flyway.configure().dataSource(url, "admin", "test").load();
		flyway.migrate();
	}
	@Test
	void contextLoads() {
	}
}

by executing the tests:
[ERROR] Errors:
[ERROR] DemoApplicationTests.initDb:16 » NoClassDefFound com/fasterxml/jackson/annotation/JsonSerializeAs
[INFO]
[ERROR] Tests run: 1, Failures: 0, Errors: 1, Skipped: 0

Additionnaly, by examining the dependencies, we see that Flyway is needing a new dependency to tools.jackson.core:jackson-databind:3.1.0.
I see that by changing the version of tools-jackson from 3.1.0 to 3.0.0, it fixed the problem. (But I don't find it very clean)

        <dependency>
            <groupId>org.flywaydb</groupId>
            <artifactId>flyway-core</artifactId>
            <version>${flyway.version}</version>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>tools.jackson.core</groupId>
                    <artifactId>jackson-databind</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- Version of tools jackson, not faster XML version tools.jackson.core:jackson-databind -->
        <dependency>
            <groupId>tools.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>3.0.0</version>
        </dependency>

In conclusion, I found no way to use Flyway 12.1.0 with spring boot 3.5.11 and with jackson 2.19.4 (the default for SB3.5.11) without some exclusion modifications

Upgrading to v12.1.0 breaks Springboot 3 projects. #4214

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