HikariCP Postgresql Driver Claims to not accept JDBC URL
There are a few issues with that URL and a latest PSQL driver may complain. jdbc:postgres: should be replaced with jdbc:postgresql: Do not use jdbc:postgresql://<username>:<passwor>…, user parameters instead: jdbc:postgresql://<host>:<port>/<dbname>?user=<username>&password=<password> In some cases you have to force SSL connection by adding sslmode=require parameter So your URL should be: jdbc:postgresql://@pellefant.db.elephantsql.com:5432/cwkqmdql?user=cwkqmdql&password=SsVqwdLxQObgaJAYu68O-8gTY1VmS9LX or jdbc:postgresql://@pellefant.db.elephantsql.com:5432/cwkqmdql?user=cwkqmdql&password=SsVqwdLxQObgaJAYu68O-8gTY1VmS9LX&sslmode=require I hope that will help.