Do you want more details about the exceptions thrown? You can get these additional logging as well as packet tracing by enabling JDBC logging and tracing.
In this video, we will describe the properties to enable logging, different logging levels that you can enable, log rotation, and enabling packet tracing for network level issues. The video also demonstrates this through a sample.
Note: This approach applies to releases up to 21c. Logging frameworks have changed after 23c release.
JDBC and UCP Landing Page: www.oracle.com/jdbc
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