Spring Boot 2.1.0 with Flyway 4.2.0

troger19 :

I would like to upgrade for my new projects to Spring Boot version 2.1.0, but I am limited with Oracle 11 database, which is supported by the Flyway 4.2.0 library. Everything runs normally on Spring Boot version 2.0.5 Release, but when moving to 2.1.0 release I get this error:

java.lang.NoClassDefFoundError: 
org/flywaydb/core/api/configuration/FluentConfiguration

The POM configuration is as follows:

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.0.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
    <ojdbc6.version>11.2.0.1</ojdbc6.version>
</properties>

<dependencies>
    <dependency>
        <groupId>com.oracle.jdbc</groupId>
        <artifactId>ojdbc6</artifactId>
        <version>${ojdbc6.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <dependency>
        <groupId>org.flywaydb</groupId>
        <artifactId>flyway-core</artifactId>
        <version>4.2.0</version>
    </dependency>
</dependencies>

UPDATE

I am able to solve the problem via @Configuration (or of course add to the main class), but the thing is its a bug or feature? Prior to version 2.1.0 everything was done via autoconfiguration and it works out-of-box.

@Bean(initMethod = "migrate")
Flyway flyway() {
    Flyway flyway = new Flyway();
    flyway.setBaselineOnMigrate(true);
    flyway.setDataSource("jdbc:oracle:thin:@localhost:1521:xe", "USER", "PASSWORD1");
    return flyway;
}

JB Nizet :

I had the same problem with PostgreSQL 9.2, and used the following class to solve the problem.

Be aware though that all the custom properties you might set in the Spring Boot properties will be ignored, since that replaces the whole Flyway autoconfiguration by your own. So you might have to add some additional code to fit your needs.

@Configuration
class FlywayConfig {
    @Bean
    fun flyway(dataSource: DataSource): Flyway {
        val flyway = Flyway()
        flyway.dataSource = dataSource
        return flyway
    }

    @Bean
    fun flywayInitializer(flyway: Flyway): FlywayMigrationInitializer {
        return FlywayMigrationInitializer(flyway, null)
    }

    /**
     * Additional configuration to ensure that [EntityManagerFactory] beans depend on the
     * `flywayInitializer` bean.
     */
    @Configuration
    class FlywayInitializerJpaDependencyConfiguration : EntityManagerFactoryDependsOnPostProcessor("flywayInitializer")
}

PS: this is Kotlin code, but you should be able to translate it to Java fairly easily.