Connection fails with 'Invalid Oracle URL specified'

dev704

Hi
When running below, the connection fails. Is there a way to get more detailed debug information?
Running sqlplus with the same parameters connects correctly

C:\utPLSQL-cli\bin\utplsql run test/test_pwd@//server1.com:1521/service1
jdbc:oracle:oci8:****/****@//test/test_pwd@//server1.com:1521/service1: Invalid Oracle URL specified
jdbc:oracle:thin:****/****@//test/test_pwd@//server1.com:1521/service1: Invalid Oracle URL specified
Could not establish connection to database. Reason: Invalid Oracle URL specified

utplsql info
cli 3.1.2-SNAPSHOT.local
utPLSQL-java-api 3.1.2.271