Trigger - Delete Account Through A Java Interface Using JDBC - Get Error?

Here are the relevant tables to the triggers I'm having trouble with.

create table profile
(
userID number(10),
uname varchar2(64),
email varchar2(32),
password varchar2(32),
date_of_birth date,

[code]...

Here's the triggers I currently have that doesn't work.

create or replace trigger DropAccount
after delete on profile
FOR EACH ROW
BEGIN
delete from groupMembership where (userID = :old.userID);
END;

The DropAccount trigger's purpose is to delete all the records from groupMembership that contains the userID of the person deleting his/her own account. It appears to work when I run the following statements in sqlplus:

delete from profile where (userID = '1');
select * from groupMembership where (userID = '1');

But when I try to delete an account through a java interface using JDBC I get the following error:

Machine Error: java.sql.SQLException: ORA-04091: table *****.GROUPMEMBERSHIP is mutating, trigger/function may not see it
ORA-06512: at "*****.DROPACCOUNT", line 2
ORA-04088: error during execution of trigger '*****.DROPACCOUNT'

The java function basically just executes a delete statement.