However, running migrations at startup does add to your app’s boot time and may cause you to exceed the boot-timeout limit imposed by Heroku. You can run Flyway automatically by including the flyway-core dependency in your app and putting your migration scripts in src/main/resources/db/migration/, as demonstrated in this Spring and Flyway sample application. In this article, we’ll discuss the best mechanisms for use on Heroku. Using Flywayįlyway provides several mechanisms for running migrations including a command-line tool, Maven plugin, Gradle plugin and an SBT plugin. Liquibase is not the only migration engine for Java. With this in place, you can add a process entry to your Procfile that will run the migrations in the release phase of deployment: release: java -jar target/dependency/liquibase.jar -changeLogFile=src/main/resources/db/changelog/db.changelog-master.yaml -url=$JDBC_DATABASE_URL -classpath=target/dependency/postgres.jar update This will copy the JAR file to target/dependency/liquibase.jar during the Maven package goal. To use this tool, you’ll need to include the Liquibase JAR file in your slug by adding the following plugin configuration to your Maven pom.xml: Your Liquibase migrations can be run in Heroku release phase using the Liquibase command-line tool. Running Liquibase with the command-line tool If that overhead is prohibitive you may want to run Liquibase without Maven. m2 cache is not included in your app’s slug. However, this will require downloading all of the Liquibase dependencies each time release phase runs because the Maven. Will run the migrations in the release phase of deployment: release. With this in place, you can add a process entry to your Procfile that If you’re not already, you can add it by running: $ mvn -N io.takari:maven:wrapper Next, make sure you’re using the Maven Wrapper in your project. Src/main/resources/db/changelog/db.changelog-master.yaml The Liquibase migrations can be run in Heroku release phase using the Liquibase Maven Plugin by adding the following plugin configuration to your pom.xml: If so, you may find that running the migrations in the Heroku release phase is preferable. Upon startup, you will see something like this in your logs: T02:00:51.937179+00:00 app: 02:00:51.936 INFO 3 - liquibase : Successfully acquired change log lock If you are using Spring Boot, you only need to include the liquibase-core dependency and put your change log in src/resources/db/changelog/db.changelog-master.yaml, as demonstrated in this Spring and Liquibase sample application. Liquibase provides a very convenient SpringLiquibase bean that automatically runs your migrations on startup if they are in the correct location. Running Liquibase automatically with Spring It provides a Maven plugin, a standalone command-line tool, a Hibernate plugin, and a Spring Bean. In this article, you’ll learn how to use two tools, Liquibase and Flyway, to run database migrations for a Java application on Heroku. These changes are often controlled by a process called migrations or evolutions. Most database-backed applications will need to change their database schema during the course of operations.
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