Ora-29541 could not resolve class

Question

Bear with me if I sound stupid. Can't help it (because I am)! I am running this code in Java and I keep getting this error: ORA-29541 AFATDS.joeycode could not be resolved.
connection=java.sql.DriverManager.getConnection(url, username, password);
stmt=connection.prepareStatement("Create or replace directory Bfile_dir as '/comp_order/joey/trig/trig/bin');
stmt.execute();
stmt.execute("Create or replace JAVA CLASS using BFILE (Bfile_dir, 'joeycode.class')");
stmt.execute("Create or replace procedure Before_update as language JAVA name 'joeycode.printmsg()';");
stmt.execute("Create or replace trigger pre_upd_trigger BEFORE UPDATE on table_name CALL Before_update");
stmt.execute("Update table_name SET column1 = 0");

Answer 1

Thanks for replying. I tried running the command you gave but an exception was thrown, specifally "Exception in thread "main" java.lang.NoClassDefFoundError: oracle/aurora/util/Wrapper"
Also, the reason I was trying to do it the way I was trying to do it, was because the program needs to automatically put the java code in the Oracle database at the system startup.