Web Reference: Jun 14, 2018 · During attempt to create HibernateSession application fails with exception: Caused by: java.sql.SQLException: Unknown initial character set index '255' received from server. Jan 16, 2026 · In this blog, we’ll break down why this error occurs and provide a step-by-step guide to fix it without modifying MySQL configuration files (like my.ini on Windows or my.cnf on Linux/macOS). Jan 16, 2026 · The "Unknown initial character set index '255'" error in Hibernate is a common compatibility issue between MySQL’s character sets and outdated JDBC drivers. By updating your driver, adjusting the connection URL, or setting Hibernate properties, you can resolve it without server access.
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