JDBC thin driver and Oracle 8.1.6

Hi,
I have installed Oracle 8.1.6 on Windows NT 4.0 with service pack 4 and using Oracle JDBC thin driver driver (classes111.zip). My application is multithreaded, but each thread maintains its own connection (and own set of Statements). Things are okay in single threaded mode, but in multi threaded mode, I get weird errors!
1. My resultsets are SCROLL_SENTITIVE and UPDATABLE
2. Sometimes, while updating a row, "No current row" SQLException is thrown, although a row exists that satisfies my select criteria
3. I am also calling executeUpdate() for inserting new rows and such rows are not seen by successive resultsets!
Appreciate any hints! Thanks!

Try this isntead.
java -classpath d:\jdbc\classes12.zip;. jdbccheckup
an error occured:
Exception in thread "main" java.lang.NoClassDefFoundError:jdbccheckup
Why??????

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