Why Am I Getting a `ClassCastException: java.math.BigInteger Cannot Be Cast to java.lang.Long` When Connecting to MySQL?

ClassCastException: java.math.BigInteger Cannot Be Cast to java.lang.Long During MySQL Connection

When attempting to establish a connection to a MySQL database, users may encounter the following error:

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

This error originates when the Java code attempts to cast a java.math.BigInteger object to a java.lang.Long object, which is not a valid operation.

Cause:

The error arises due to a version compatibility issue between the MySQL database and the mysql-connector.jar library used for JDBC connectivity. Older versions of MySQL or the mysql-connector.jar may not support proper casting between BigInteger and Long data types.

Solution:

To resolve this issue, follow these steps:

1. Upgrade MySQL Database: If your MySQL database is an older version, consider upgrading it.
2. Upgrade mysql-connector.jar: Ensure that you are using the latest version of the mysql-connector.jar library. Recommended versions are 5.1.47 or 8.0.12 or newer.
3. Adjust Code: If updating the database and JDBC driver is not feasible, you may need to adjust your code to handle the casting issue. This can involve converting the BigInteger value to a Long value using methods like longValue() or BigInteger.valueOf() before performing the casting.

After implementing these steps, you should be able to establish a successful connection to the MySQL database without encountering the ClassCastException error.

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