AccessShareLock question

I get an AccessShareLock in a simple select command and I am not using the
FOR SHARE clause.
The select is just "select * from controle". The connection is JDBC and the
driver is postgresql-8.4-701.jar.
What am I doing wrong?

This is the code:

Class.forName(jdbc).newInstance();
Connection connection = DriverManager.getConnection(url, login,
password);
connection.setCatalog(database);
connection.setAutoCommit(false);
Statement st = connection.createStatement();
ResultSet rs = st.executeQuery("select * from controle");
while (rs.next()) {
System.out.println(rs.getString(1));
}
rs.close();
st.close();

Thanks,

Clayton