Migrate from jars in flyway maven plugin - maven

Question

Is it possible to migrate from jars in maven flyway plugin? I have no problems with sqls and java (compiled to class) but no success with jars. Classpath is set correctly.

Answer 1

Ok, i've debugged the source code. Jar needs a special protocol that is being provided to it when it is placed in /jars catalog in flyway command line tool. There is no such an equivalent in a flyway maven plugin.

Answer 2

This is a slight workaround to the limitation of the flyway-maven-plugin executing from a jar artifact file containing multiple flyway SQL files.
Create a profile
Use the 'maven-dependency-plugin:unpack' to explode the content of your jar file to specific directory.
Run 'flyway-maven-plugin' with a 'location' limited to the extracted directory.
Not very pretty but works.
This is my sample profile
<profiles>
<profile>
<id>flyway</id>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>3.1.1</version>
<executions>
<execution>
<id>copy</id>
<phase>process-resources</phase>
<goals>
<goal>unpack</goal>
</goals>
</execution>
</executions>
<configuration>
<artifactItems>
<artifactItem>
<groupId>com.abc</groupId>
<artifactId>flyway</artifactId>
<version>1.0.0-SNAPSHOT</version>
<type>jar</type>
<overWrite>true</overWrite>
<outputDirectory>${project.build.directory}/jars</outputDirectory>
<destFileName>my-flyway.jar</destFileName>
</artifactItem>
</artifactItems>
<overWriteReleases>false</overWriteReleases>
<overWriteSnapshots>true</overWriteSnapshots>
</configuration>
</plugin>
<plugin>
<groupId>org.flywaydb</groupId>
<artifactId>flyway-maven-plugin</artifactId>
<version>${flyway.version}</version>
<configuration>
<sqlMigrationSeparator>__</sqlMigrationSeparator>
<locations>
<location>filesystem:./target/jars/my-flyway.jar</location>
</locations>
<url>${flyway.url}</url>
<user>${flyway.user}</user>
<password>${flyway.password}</password>
<schemas>
<schema>my_schema</schema>
</schemas>
<baselineOnMigrate>true</baselineOnMigrate>
</configuration>
<dependencies>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>${postgresql.version}</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>
</profile>
</profiles>
The maven command line is then
mvn -P flyway clean process-resources flyway:migrate