This does it always for me:

Database (UNICODE_FSS charset btw):
CREATE TABLE JB2TEST (
A VARCHAR(50) NOT NULL,
B BIGINT NOT NULL,
C BIGINT NOT NULL
);

Java class:

import java.sql.*;


class JBIRD2Error {
Connection conn;
PreparedStatement prepTest;


public static void main(String args[]) {
new JBIRD2Error();
}

JBIRD2Error() {
conn=null;

try{ Class.forName("org.firebirdsql.jdbc.FBDriver").newInstance();
} catch(Exception e) {e.printStackTrace(System.out);}

long start=System.currentTimeMillis();
try {
conn = DriverManager.getConnection(

"jdbc:firebirdsql://localhost:3050/mydbfile?lc_ctype=UNICODE_FSS&sql_role_name=myrole","myuser","mypass");

System.out.println("Connected to DB in
"+(System.currentTimeMillis()-start)+" milliseconds");
} catch(Exception e) {
System.out.println("UNABLE to connect to DB in
"+(System.currentTimeMillis()-start)+" milliseconds");
e.printStackTrace(System.out);
}
System.out.println("Preparing statements");
try {
initPreparedStatements();
} catch(Exception e) {
e.printStackTrace(System.out);
}
System.out.println("Setting autocommit");
try{conn.setAutoCommit(false);}catch(Exception e)
{e.printStackTrace(System.out);}
System.out.println("Closing conn");
try{conn.close();}catch(Exception e) {e.printStackTrace(System.out);}
}

protected synchronized void initPreparedStatements() throws
Exception{
prepTest=conn.prepareStatement("select B,C from JB2TEST where
A=?");
}

}

--- In Firebird-Java@yahoogroups.com, "Roman Rokytskyy"
<rrokytskyy@a...> wrote:

> > I'm running my program under java1.5 with jaybird1.55 and FB 1.5.2 SS.
> > I've changed autocommit mode to false whenever I use more than 1 open
> > resultsets.
> > Program still works with JBIRD1.55, but with JBIRD2.0 it throws the
> > following Exception:
> > "
> > java.util.ConcurrentModificationException
> > at
> > ...
> > At the first setAutoCommit(false) in my program.
> >
> > Is it me, or is it me?
>
> Should not happen. Do you have a reproducable test case for this bug?
>
> Roman