Let say you have requirement to call stored procedure from your Java code. You can use following sample code for your reference. Change the connection source as per your requirement and call the method.

package com.app.util;

import java.sql.*;

public class StoredProcedureExample {
     public Connection conn = null;

     public void createDatabaseConnection() throws SQLException{
         String URL = "jdbc:oracle:thin:@mydatabase:1521:Oracle";
         String USER = "myuser";
         String PASS = "mypassword";
         conn = DriverManager.getConnection(URL, USER, PASS);
     }

     /**
      * Assuming you need to call procedure myStoreProcedure
      * It take integer as input
      * It return 3 paramter integer, varchar, and float
      * */
     public String callStoreProcedure() throws SQLException{
         try{
                 int myId = 10;
                 CallableStatement pstmt = conn.prepareCall("{call myStoreProcedure(?,?,?,?)}");
                 pstmt.setInt(1, myId);
                 pstmt.registerOutParameter(2, Types.INTEGER);
                 pstmt.registerOutParameter(3, Types.VARCHAR);
                 pstmt.registerOutParameter(4, Types.FLOAT);
                 pstmt.executeUpdate();

                 int myNo = pstmt.getInt(2);
                 String myName = pstmt.getString(3);
                 float mySalary = pstmt.getFloat(4);
                 System.out.print("My Details are" +myNo+" "+myName+" "+mySalary);
                 pstmt.close();
                 conn.close();
                 return myNo+" "+myName+" "+mySalary;
          }catch (SQLException e) {
                 System.err.println(e.getErrorCode() + e.getMessage()); 
                 conn.close();
                 return null;
             }       
     }

     public static void main(String[] args){
       try{
         StoredProcedureExample spEx=new StoredProcedureExample();  
         spEx.createDatabaseConnection();
         spEx.callStoreProcedure();
       }catch(Exception e){
           e.printStackTrace();
       }
     }
}