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null field in ResultSet

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By: Mihai Gheorghiu - tanethq

null field in ResultSet

2002-02-19 10:29

How does JR treat nulls in ResultSets?

Thank you all.



By: Teodor Danciu - teodord

RE: null field in ResultSet

2002-02-20 09:27




There is only one thing users should

know about when working with expressions:


If JasperReports encounters a NullPointerException

when evaluating an expression,

it ignores this exception and the entire

expression will evaluate to null.

Any other caught exceptions, are wrapped

in a JRException and throw up the call stack.


To avoid displaying the "null" text in the text

fields, there is a flag called "isBlankWhenNull"

in the "textField" element.


Null fields in the ResultSet are not

treated differently.

You should consider handling null values

in fields to avoid any problems.




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