Hello. You cannot connect to the same file from multiple instances of H2. You need to use the standalone H2 Server process and use remote connections to it (this way is safer), or you can use the automatic mixed mode ( https://h2database.com/html/features.html#auto_mixed_mode), but with mixed mode you need to make sure that you use exactly the same version of H2 in all your processes and you should avoid abnormal termination of these processes.
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