Create the object - not correct data in the file ?

I have the text file, then I parse and create objects MyDocument (one row = one document). If row is corect then I create object MyDocument. But what I must do when row is not correct. The row can have 3 type of errors:
1.Not correct length of row
2.Not filled required fields in row
3.Field are filled by not correct data
Is a good to throw exception when I get one of this errors. Do I need to store this errors on separate class (MyObjectErrors extends Exception)?
So when row is correct I create the object MyDocument. Otherwise I NOT create object MyDocument and throw exception. Is this a good solution?

One question These 3 error you want together or what let me know i ll do that code n give you

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Discoverer Plus 10gR2 not show data when the script of view have package

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This appears to be a grant issue. Apparently, you have granted execute with respect to this package to the EUL owner or the view would not have compiled. If you have not given EUL owner the grant option, I would recommend doing this as well.
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Also, by default, a stored package executes with the privileges of its owner. If your custom package was designed this way, are the objects which it references received the appropriate grant? I assume you tested this, but I am concerned that the line, a.prod = k_xps_tools.f_obt_prod, in the where clause could be resulting in the Null set being returned.
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Create the object - not correct data in the file ?

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