where to close DBconnection in struts..urgent..please help

[Sri chirat]

I have DAO.java, DAOManager.java for database transactions in my application.
I am using STRuts1.1, eclipse,j2sdk1.4.2, MySql, Tomcat 5.0
where do I close the database connection ..
Is it in DAO class...inside the methods for the transactions.
1.if I do this...I am getting exception saying connection is closed in daomanager.
2.if I do this in DAOmanager class....not in DAO.java..then my application
hangs up after 3 or 4 transactions......

//DAO.java
public void addProgramEnroll(Familyclient familyclient) throws DatastoreException{
PreparedStatement pspprogramenrollinfo = null;
try {
if (conn.isClosed()) {
throw new IllegalStateException("error.unexpected");
}
pspprogramenrollinfo = conn.prepareStatement(SQL_INSERT_PROGRAM);
......
pspprogramenrollinfo.execute();
}
} catch (SQLException ex) {
ex.printStackTrace();
} catch (NumberFormatException nfe) {
nfe.printStackTrace();
} finally {
try {
if (pspprogramenrollinfo != null) {
pspprogramenrollinfo.close();
//conn.close();
}
} catch (SQLException e) {
e.printStackTrace();
throw new RuntimeException("error.unexpected");
}
}
}


//DAOmanager.java

public void addProgramEnroll(ServletContext sc, Familyclient familyclient)
throws DatastoreException {
Connection conn = getConnection(sc);
FamilyclientDao dao = new FamilyclientDao(conn);
try{
dao.addProgramEnroll(familyclient);
conn.commit();
}catch (Exception ex){
throw DatastoreException.datastoreError(ex);
}finally {
if (conn != null) {
try {
conn.close();
} catch (SQLException sqle) {
log.error("Exception closing connection", sqle);
}
}
}
}