Hello, based on the details which are shared, the error messages seem to be originating from Java and not on the Redshift server. To investigate on Redshift end , its recommended to monitor Redshift cluster for any downtime or resource contentions during the issue time-frame and whether that is co-relating with the application threads to be blocked - >https://docs.aws.amazon.com/redshift/latest/mgmt/metrics.html. Another thing to take a look at is whether the Redshift's driver version is updated to the latest version ->https://docs.aws.amazon.com/redshift/latest/mgmt/jdbc20-download-driver.html. The questions posted are more Java application specific and I am afraid I will not be able to answer those as code support falls outside of our scope.
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