JDBC2 driver failure

Hello,

I have some code that does the following:

ResultSet rs = stmt.executeQuery("myQuery");

while (rs.next()) {
    //some processing
    String query = "blahblah";
    ResultSet rs2 = stmt.executeQuery(query);
}

All the processing up to rs2 works fine, but the instant I try to get the
result set,
I get the following errors in my catalina.out log file on Tomcat4:

java.lang.NullPointerException
        at org.postgresql.jdbc2.ResultSet.next(ResultSet.java:113)
        at
org.apache.commons.dbcp.DelegatingResultSet.next(DelegatingResultSet.java)

Any ideas? This is part of an in-house app I'm building and seems to be the
last stumbling block.

Thanks a lot,
Haig Ehramdjian