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Nullpointer with RowSet

 
Lucas Moraes
Greenhorn
Posts: 13
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Hi everybody, I'm currently studying for the OCPJP 7 and I'm programming some JDBC classes, It was all ok until I found this strange bug and want to know why is this happening.

The situation is as follows:

I have this class TestRowSet.java:



but I'm getting a nullpointer when the code reaches row.first() method, and if I remove this line the nullpointer is at row.next() instead, as if there is no resultset object anymore after the commit method.

if I remove the row.commit method, the code prints fine(only doesn't save anything on the database) , and strangest yet is that I have a similar class using the plain old ResultSet instead:



But this class runs fine, so I'm wondering, what is wrong in the rowset class? is there any difference between Connection.commit() and JdbcRowSet.commit()?

 
Lucas Moraes
Greenhorn
Posts: 13
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Is the question really that difficult? or I didn't explained clear enough?
 
Jeanne Boyarsky
author & internet detective
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Your explanation is fine. It seems like a bug in the driver, not something we can explain.
 
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