Introduction:
Are you facing migration failures with Spring Boot 2.2.1 and H2? Upgrading your project’s Spring Boot version can sometimes introduce unexpected issues, especially when it comes to database migrations. In this article, we will explore the common problems developers encounter during the migration process and provide practical solutions to overcome them. Let’s dive into the world of Spring Boot, H2, and Flyway to understand why your migrations might be failing and how to fix them.
Understanding the Migration Error
When you perform a migration after upgrading to Spring Boot 2.2.1, you might encounter an error similar to the following:
Code:
code
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'flywayInitializer' defined in class path resource [org/springframework/boot/autoconfigure/flyway/FlywayAutoConfiguration$FlywayConfiguration.class]
: Invocation of init method failed; nested exception is org.flywaydb.core.internal.command.DbMigrate$FlywayMigrateException:
Migration V1__Creating_tableName_table.sql failed
------------------------------------------------------
SQL State : 42001
Error Code : 42001
Message : Syntax error in SQL statement "CREATE TABLE MY_PROJECT_TABLE (
-- table definition here
) ENGINE=[*]
INNODB"; expected "identifier"; SQL statement:
CREATE TABLE my_project_table (
-- table definition here
) ENGINE=InnoDB [42001-200]
Location : db/migration/V1__Creating_tableName_table.sql (/path/to/file.sql)
Line : 1
This error suggests a syntax problem in your migration script. The specific issue seems to be related to the ENGINE=INNODB
clause. Let’s investigate further to find a solution.
Identifying the Root Cause
To understand the cause of this error, we need to consider a few factors. Upgrading Spring Boot can introduce changes in its transitive dependencies, including the H2 database. There might have been changes to H2’s compatibility mode or other configurations that affect the migration process. Let’s explore possible solutions to fix this issue.
Solution – Enabling MySQL Compatibility Mode
H2 1.4.200, the default version in Spring Boot 2.2.1, requires enabling MySQL compatibility mode to use the ENGINE=INNODB
clause. To enable this mode, you can append ;MODE=MySQL
to the connection URL. Additionally, you may consider adding ;DATABASE_TO_LOWER=TRUE
and ;CASE_INSENSITIVE_IDENTIFIERS=TRUE
to your connection URL for a better MySQL compatibility experience.
Alternative Solution – Modifying Autoconfiguration
If you prefer not to modify the connection URL directly, you can tweak the autoconfiguration settings in Spring Boot. Check the link provided in the following Stack Overflow answer for guidance: stackoverflow.com/a/43557541/141042.
Conclusion
In this article, we delved into the world of Spring Boot, H2, and Flyway migrations. We explored a common migration error that occurs when upgrading to Spring Boot 2.2.1 and discussed two potential solutions to overcome the issue. By enabling MySQL compatibility mode or modifying the autoconfiguration, you can ensure smooth migrations and maintain the integrity of your database schema.
Remember, understanding the intricacies of your project’s dependencies is crucial for successful migrations. Stay updated with the latest releases and consult official documentation and community resources to tackle any challenges that arise.