How to Ensure UTF-8 Character Encoding Integrity with JDBC Connections in a GlassFish 3 Web Application?

JDBC Character Encoding for UTF-8 Integrity

In a web application using GlassFish 3, EclipseLink JPA, and MySQL, users have encountered an issue where string fields in database entities lose integrity when saved using the update() method, resulting in the display of '?' characters. This problem persists despite configuring the server, pages, and database to use UTF-8 encoding.

To address this issue, it's crucial to recognize that character encoding is determined by JDBC rather than JPA. To ensure proper encoding, the JDBC URL must explicitly specify UTF-8:

jdbc:mysql://localhost:3306/administer?characterEncoding=utf8

By setting this parameter, the JDBC connection will encode and decode data using UTF-8, preserving the integrity of string fields in entities stored in the database.

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