ORA-29531: no method checkUserExists in class sqlExecution

Hi All,

I have created java class and loaded in oracle database . With the help of java class PL sql function created but while executing th function it give below error.

ERROR at line 1:

ORA-29531: no method checkUserExists in class sqlExecution

ORA-06512: at "UPCA.CHECKUSEREXISTS", line 1

ORA-06512: at line 10

Code is given as below.

USER is "UPCA"

SQL>

SQL> CREATE OR REPLACE FUNCTION checkUserExists(

    dbService IN VARCHAR2,

    mySql     IN VARCHAR2)

  RETURN refcurpkg.refcur_t

IS

  language java name 'sqlExecution.checkUserExists ( java.lang.String , java.lang.String ) return java.sql.ResultSet';

  / 

Function created.

SQL> show erro

No errors.

SQL> alter function checkUserExists compile;