When working with Hibernate and Oracle DB with Wallet. Getting below error: org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl HHH000115: Hibernate connection pool size: 20 (min=1) I am trying currently with Java/JDK: 17 Hibernate: ‘org.hibernate:hibernate-core:5.4.27.Final’ Oracle Autonomous DB: 19c connection via wallet. I tried with different version of JDK(8 and 11) and Hibernate(5.3.xx, 6.4.xx, 5.2.xx). Same error everytime. Answer The issue in my case was because