Calling a java class from an oracle stored procedure

my oracle stored procedure is:
create or replace
PROCEDURE openpdffile
AS LANGUAGE JAVA
NAME 'pdfopenbook.mainbook()';
it is valid and so is this java class;
import java.sql.*;
import oracle.jdbc.*;
public class pdfopenbook //class pdfopen
public static void mainbook(String args[]) //main function
try //try statement
Runtime.getRuntime().exec("rundll32 url.dll,FileProtocolHandler " + "c:\\temp\\final_book.pdf");
// Runtime.getRuntime().exec("rundll32 url.dll,FileProtocolHandler " + "sol.exe");
} catch (Exception e) //catch any exceptions here
System.out.println("Error" + e ); //print the error
but i get the error:
onnecting to the database caprs.
ORA-29531: no method mainbook in class pdfopenbook
ORA-06512: at "CAPRS.OPENPDFFILE", line 1
ORA-06512: at line 2
Process exited.
Disconnecting from the database caprs.
it says there is no mainbook method but there is, what am i doing wrong??
Thanks,
Doug

http://wiki.answers.com/Q/Can_you_call_a_java_function_from_an_oracle_stored_procedure

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Calling a java class in my oracle database from a oracle stored procedure

my oracle stored procedure is:
create or replace
PROCEDURE openpdffile
AS LANGUAGE JAVA
NAME 'pdfopenbook.mainbook()';
it is valid and so is this java class;
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import oracle.jdbc.*;
public class pdfopenbook //class pdfopen
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try //try statement
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