ERROR com.zaxxer.hikari.pool.HikariPool – HikariPool-2 – Exception during pool initialization. java.sql.SQLException: ORA-28040: No matching authentication protocol

The error message “ERROR com.zaxxer.hikari.pool.HikariPool – HikariPool-2 – Exception during pool initialization. java.sql.SQLException: ORA-28040: No matching authentication protocol” typically occurs when attempting to connect to an Oracle database using JDBC, and the authentication protocol used by your JDBC driver is not compatible with the Oracle database’s authentication settings.

Here’s an analysis of the error and a solution from the perspective of an individual developer:

Error Explanation:

• The error message suggests that there was an exception during the initialization of a database connection pool (likely using HikariCP).
• The underlying error is an ORA-28040 error, which is an Oracle database error code. It means “No matching authentication protocol,” indicating a compatibility issue between the JDBC driver and the Oracle database’s authentication protocol.

Solution:
To resolve this issue as an individual developer, follow these steps:

1. Check Oracle Database Version:

• Verify the version of your Oracle database. Different versions of Oracle databases may use different authentication protocols.

1. Update JDBC Driver:

• Ensure that you are using a JDBC driver that is compatible with the version of your Oracle database. You may need to download and use a newer version of the JDBC driver provided by Oracle.

1. Review JDBC Connection URL:

• Review your JDBC connection URL to ensure it’s correctly configured with the appropriate protocol and connection details. The URL should include the correct hostname or IP address, port, and database service name.

1. Check Authentication Configuration:

• Review the authentication settings and configuration of your Oracle database. Make sure it’s configured to allow the authentication protocol used by your JDBC driver.

1. Authentication Protocol Compatibility:

• Confirm that the JDBC driver you’re using supports the authentication protocol configured in your Oracle database. If not, consider updating the JDBC driver to a version that does.

1. Enable the Appropriate Authentication Protocol:

• If necessary, you may need to configure your Oracle database to use a compatible authentication protocol. This might involve modifying the SQLNET.ORA or listener.ora files in your Oracle configuration.

1. Check Network Security Rules:

• Ensure that there are no network security rules or firewalls blocking the communication between your application and the Oracle database.

Here is an example of how you might configure a HikariCP data source with a compatible JDBC driver for Oracle:

import com.zaxxer.hikari.HikariConfig;
import com.zaxxer.hikari.HikariDataSource;

public class OracleConnectionPool {
    public static HikariDataSource createDataSource() {
        HikariConfig config = new HikariConfig();
        config.setJdbcUrl("jdbc:oracle:thin:@//hostname:port/service_name");
        config.setUsername("your_username");
        config.setPassword("your_password");
        config.setDriverClassName("oracle.jdbc.OracleDriver");
        return new HikariDataSource(config);
    }
}

Make sure to replace "hostname", "port", "service_name", "your_username", and "your_password" with the appropriate values for your Oracle database.

By following these steps and ensuring compatibility between your JDBC driver, Oracle database version, and authentication settings, you should be able to resolve the “ORA-28040: No matching authentication protocol” error and successfully connect to your Oracle database using HikariCP or any other JDBC connection pool.