How to Prevent \"Table Not Found\" Errors in H2 In-Memory Databases?

H2 In-Memory Database: Addressing "Table Not Found" Error

When working with an H2 database in in-memory mode, users may encounter an error message stating "Table 'table_name' not found" when attempting to access a created table. This puzzling behavior stems from the fact that the default settings for H2 in-memory databases cause the database content to be discarded when the last connection is closed.

Solution: Configuring DB_CLOSE_DELAY

To prevent data loss in in-memory H2 databases, it is imperative to modify the database URL and include the parameter "DB_CLOSE_DELAY=-1". By doing so, the database will remain open and preserve its content even after the last connection is closed. The updated connection URL should resemble the following:

jdbc:h2:mem:test;DB_CLOSE_DELAY=-1

Importance of DB_CLOSE_DELAY

As noted in the official H2 documentation for in-memory databases:

"By default, closing the last connection to a database closes the database. For an in-memory database, this means the content is lost. To keep the database open, add ;DB_CLOSE_DELAY=-1 to the database URL. To keep the content of an in-memory database as long as the virtual machine is alive, use jdbc:h2:mem:test;DB_CLOSE_DELAY=-1."

Conclusion

Adding the "DB_CLOSE_DELAY=-1" parameter to the H2 in-memory database URL ensures that the database content is retained, preventing the "Table Not Found" error and enabling seamless data access even after connections are terminated.

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