Solving the java.lang.UnsupportedOperationException Error in Spring Boot with H2 Database

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As a developer using Spring Boot, you might have encountered a frustrating error when working with the H2 database. The error message you're seeing is:

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This exception typically occurs during the initialization of your datasource, specifically when using the Hikari connection pool. If you’re unsure about the cause and potential resolution for this issue, you’re in the right place. Let’s break it down!

Understanding the Problem

The error message indicates that your application is trying to perform an operation that is not supported. In this case, the root cause is often related to incorrect JDBC connection configurations. Here’s what your initial configurations looked like:

Application Properties:

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POM Dependencies:

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The H2 database version in use (2.1.214) is significant here, as it introduces a few changes compared to previous versions that can lead to this error.

Solution: Fixing the JDBC URL

The key to resolving the UnsupportedOperationException lies in your JDBC connection URL. The specific setting causing the issue is the MV_STORE=false parameter. Here’s what you need to know:

Why Remove MV_STORE=false?

H2 Version 2.x Changes: With the release of H2 version 2.x, the MVStore (Multi-Version Store) is the only supported storage mechanism. Therefore, specifying MV_STORE=false is invalid as it does not exist in this version.

Default Behavior: In H2 2.x, MVStore is enabled by default, which makes the operation to handle your requests with MVStore.

Updated JDBC URL

To fix the issue, simply update the JDBC URL in your application properties by removing the MV_STORE=false setting:

New Application Properties:

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Conclusion

If you continue to encounter issues, be sure to review your other configurations or consult the H2 database documentation for further guidance. Happy coding!