How to call a procedure in Oracle from clojure - oracle

Question

I want to be able to call a procedure in an Oracle database using Clojure.
I have a connection to an Oracle database and I can query the tables of the db using select queries with parameters.
E.g.: If I run "SELECT * FROM user_tables" I get the list of tables as the result. So the connection is working and I do have the correct credentials to make this connection.
I'm using the following dependencies:
[org.clojure/clojure "1.10.1"]
[org.clojure/java.jdbc "0.7.11"]
and as oracle driver I tried these
[oracle.jdbc/oracledriver "11.2.0.2"] (ojdbc6 driver I installed locally under this name)
[oracle.jdbc/ojdbc7 "12.1.0.2"]
[com.oracle/ojdbc8 "19.3.0.0"] or [oracle.jdbc/ojdbc8 "12.2.0.1"]
My java version is:
java version "1.8.0_271"
Java(TM) SE Runtime Environment (build 1.8.0_271-b09)
Java HotSpot(TM) 64-Bit Server VM (build 25.271-b09, mixed mode)
Using the ojdbc6 driver results in:
Execution error (SQLException) at oracle.jdbc.driver.T4CTTIoer/processError (T4CTTIoer.java:440).
ORA-29481: Implicit results cannot be returned to client.
ORA-06512: at "SYS.DBMS_SQL", line 2785
ORA-06512: at "SYS.DBMS_SQL", line 2779
ORA-06512: at "<My procedure name>", line 157
ORA-06512: at line 1
Using the version 7 or 8 result in:
#:next.jdbc{:update-count -1}
Can anyone help me to solve this in such a way that I can see the same result set as in SQL-Developer?
Clojure code used to make the connection:
(defstate ^:dynamic *oracle*
"This variable has the database connection to the Oracle Database"
:start
(if-let [jdbc-url (:oracle (env :database-url))]
(conman/connect! {:jdbc-url jdbc-url})
(do
(log/warn "database connection URL was not found, please set :database-url for oracle in your config, e.g: dev-config.edn")
*oracle*))
:stop
(conman/disconnect! *oracle*))
(conman/bind-connection *oracle* "sql/queries-oracle.sql")
In resources/sql there is the file queries-oracle.sql which contains the procedure to be called. I tried several ways to call it:
EXEC schema_name.procedure_name :param1, :param2, :param3;
EXEC schema_name.procedure_name(:param1, :param2, :param3);
BEGIN EXEC schema_name.procedure_name :param1, :param2, :param3; END;
BEGIN schema_name.procedure_name :param1, :param2, :param3; END;
All these have a :name through which they are called. Which I'm now trying from a REPL.
The result of these tries is:
Invalid SQL-Statement
Invalid SQL-Statement
Encountered the symbol "schema_name" when expecting one of the follwing:...
#:next.jdbc{:update-count -1}