Java IllegalStateException: Cannot load driver class: oracle.jdbc.driver.OracleDriver

The IllegalStateException: Cannot load driver class: oracle.jdbc.driver.OracleDriver error in Java is usually caused by an issue with the Oracle JDBC driver that you are using to connect to the database.

There are a few common causes for this error:

1. The Oracle JDBC driver is not in the classpath: You need to make sure that the ojdbc8.jar or other Oracle JDBC driver file is included in your classpath. You can do this by adding the file to your project's build path or by using the -classpath command line option when running your program.

2. The Oracle JDBC driver is not compatible with your Java version: Make sure that you are using a version of the Oracle JDBC driver that is compatible with your Java version.

3. The Oracle JDBC driver is not compatible with your Oracle version: Make sure that you are using a version of the Oracle JDBC driver that is compatible with your Oracle version.

To troubleshoot this error, you can try the following steps:

1. Check that the Oracle JDBC driver file is in your classpath.
2. Check that the Oracle JDBC driver file is the correct version for your Java and Database versions.
3. Check for any spelling errors or typos in the driver class name or path.
4. Make sure that you are using the correct connection URL for your database.

If you are still having trouble, you can try searching online for more specific solutions or consulting the documentation for the Oracle JDBC driver and your database.