Calling an Oracle stored procedure and retrieving result from OUT parameter

Question

Hello,
I have a stored procedure that returns a string in an OUT parameter after receiving 6 IN parameters. I have tested the procedure in PL/SQL and it's producing the right output there. The problem is when I call the stored procedure from my Java method. I then get an error message telling me that I have the wrong number or types of arguments in my procedure call. I have checked that the method receives and sends the correct data in the correct order and I'm not sure what else the error message can relate to...?
The exception is called on my second try statement but I haven't been able to find out what I have done wrong there. Does anyone have any suggestions? Thanks.
the error message
java.sql.SQLException: ORA-06550: line 1, column 13: PLS-00306: wrong number or types of arguments in call to 'P_SET_GIVEN_ANSWER' ORA-06550: line 1, column 7: PL/SQL: Statement ignored
the procedure
CREATE OR REPLACE PROCEDURE p_set_given_answer(
strfeedback OUT VARCHAR2,
intpi_id IN INTEGER,
intquestion_id IN INTEGER,
intgivenanswer IN INTEGER,
strgivenprefix IN VARCHAR2,
strgivenunit IN VARCHAR2,
strgu_id IN VARCHAR2) AS
-- some declarations
BEGIN
-- some processing and then returns the string below indicating the outcome
strfeedback = 'result';
END
the java method (the class is called dbUtil and the database connection is created in the method called getDbConnection() )
public void setGivenAnswer(int intPi_id, int intQuestion_id, int intGivenAnswer, String strGu_id, String strGivenPrefix, String strGivenUnit) {
java.sql.Connection con = null;
String query = "{call ? := p_set_given_answer(?,?,?,?,?,?)}";
try {
con = dbUtil.getDbConnection();
} catch(Exception e) {
dbConnectionExceptionMessage = "error 1:"+e.toString();
try{
CallableStatement stmt = con.prepareCall(query);
// register the type of the out param - an Oracle specific type
stmt.registerOutParameter(1, OracleTypes.VARCHAR);
// set the in params
stmt.setInt(2, intPi_id);
stmt.setInt(3, intQuestion_id);
stmt.setInt(4, intGivenAnswer);
stmt.setString(5, strGivenPrefix);
stmt.setString(6, strGivenUnit);
stmt.setString(7, strGu_id);
// execute the stored procedure
stmt.execute();
// retrieve the results
strFeedback = stmt.getString(1);
} catch (java.sql.SQLException e) {
dbConnectionExceptionMessage = "error 2:"+e.toString();
try {
con.close();
} catch (java.sql.SQLException e) {
dbConnectionExceptionMessage = "error 3:"+e.toString();
----------------------------------------

Answer 1

Looks like you are declaring a procedure, but you are calling it like a function. A procedure has no return value, it has only parameters: "{call p_set_given_answer(?,?,?,?,?,?,?)}"