How to Avoid the \'Table Not Found\' Error in H2 In-Memory Databases?

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

In-memory databases provide a convenient way to store data within the memory of a running application. However, when using H2 in-memory databases, it's common to encounter the "Table not found" error while attempting to access tables.

This error typically occurs when the database URL is configured as "jdbc:h2:mem:test." By default, closing the last connection to an in-memory database will cause H2 to discard its content. To resolve this issue, the database URL should be modified to include the parameter "DB_CLOSE_DELAY=-1." This setting instructs H2 to keep the database open and its content preserved as long as the virtual machine is running.

The updated database URL should appear as follows:

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

After making this change, the "Table not found" error should no longer appear, and the table can be accessed successfully. It's important to note that the semicolon (;) must be used instead of a colon (:) in the URL.

The "Features" page of the H2 documentation provides more details on in-memory databases. Specifically, the "In-Memory Databases" section explains the default behavior and the use of "DB_CLOSE_DELAY=-1" to keep the content of an in-memory database persistent.

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