Implement Java Class into Report Builder

Question

Hi, I have problems implementing own java classes into the Report Builder. OK, let say I am running a simple report using STUDENT_ID and STUDENT_NAME. What I wanted to do is to concatenate a string "XXXX" to one of the records in STUDENT_NAME (e.g. STUDENT_NAME = 'Mary').
The Java class that I wrote has a static method:
public class MyAppend
public static String myMethod(String s)
     s = s +"XXXX";
     return s;
I also wrote a Formula Column in Report Builder called "TestFormula":
function TestFormula return varChar2 is
     StuName     varchar2(40);
     myStr     varchar2(40);
begin
select STUMST.STU_NAME
into StuName
from STUMST
where STUMST.STU_NAME= 'Mary';
->myStr := myappend.myMethod(myPackage.aobj, StuName);
return myStr;
end;
The error message I get when I compile this Formula Column PL/SQL is (with '->' pointing to the line):
Wrong number or types of arguments in call to 'MYMETHOD'
How do I correct this error?
Thank you.
Joey

Answer 1

Thanks Navneet. Actually I am new to PL/SQL programming. I have another problem here. I would like to list all the records of the STUDENT_NAME. How would I go about it using PL/SQL? This is the Formula Column I have written but it only shows me 1 record:
function TestFormula return varChar2 is
StuName     varchar2(40);
cursor c1 is
select all stumst.stu_name
from stumst;
begin
     LOOP
     open c1;
     fetch c1 into stuName;          
     stuName := myappend.myMethod(stuname);
     return stuName;
     EXIT WHEN c1%NOTFOUND;
end loop;
end;
By the way, can you please give me any useful sites for reference to the PL/SQL?
Thank you.
Joey