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Hello vikar,
Your code is just fine.
If you go to your Unit class and line numbered 265 you typed table name 'unit' in uppercase when it is expected to be in lowercase.

Thanks,
Syed.

Hello.
If you want you can just mail me your code.
I will try to fix it and reply back with the working code.

Thanks,
Syed.

I see.
Whatever query you are executing can you try that at the sql prompt. If there is no change in the table then the problem is with the query. Either such record does not exist or some other...

Hello.
Which message of JOptionPane is being shown? The one in try block or the one in catch block?
Can you print the connection obj to check if it is not null?

Syed.