How to Resolve the `ClassCastException: BigInteger to Long` Error in MySQL Connections?

ClassCastException: BigInteger to Long Conversion Issue in MySQL Connection

When attempting to connect to a MySQL database, you may encounter the following error:

java.sql.SQLException: java.lang.ClassCastException: java.math.BigInteger cannot be cast to java.lang.Long

This error occurs because the JDBC driver attempts to cast a java.math.BigInteger instance to a java.lang.Long instance. However, the casting is not possible due to the mismatch in their class types.

To resolve this issue, consider the following steps:

1. Check MySQL Version and JDBC Connector Compatibility: Ensure that you are using a compatible version of MySQL Connector/J. Previous versions may have issues with certain MySQL versions. Try updating to the latest version of MySQL Connector/J (e.g., 5.1.47 or 8.0.12).
2. Review MySQL Configuration: Check your MySQL configuration settings, particularly the character_set_server and collation_server settings. These settings may be causing the conversion issue.
3. Configure Explicit Character Set: Manually specify the character set and collation for the database connection. This can be done by adding the following lines to your connection URL:

?useUnicode=true&characterEncoding=UTF-8&autoReconnect=true

4. Use Long Type Safely: Consider using the LongTypeMapper class to safely handle BigInteger values in MySQL statements. This class can be configured to convert BigInteger values to Long values within the range supported by MySQL.
5. Cast Values Manually: If possible, explicitly cast BigInteger values to Long values before using them in MySQL statements. This will prevent the JDBC driver from attempting the problematic cast.
6. Consider Version Updates: If all else fails, consider updating your MySQL version to a more recent and supported version.

By addressing these potential causes, you can resolve the ClassCastException error and successfully establish a connection to your MySQL database.

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