Hide text field when null

[puperzenkarl]

I created a JasperReport template with iReport and checked the "Blank when null" checkbox for some text fields. When the associated field is null it prints a zero (Expression class is java.lang.Integer) and therefore is always visible. Why is that?

 

[puperzenkarl]

I think, the "Blank when null" option is not, what I am looking for. printWhenExpression should do it, but it doesn´t.

I use Boolean.valueOf($F{total} != null) as printWhenExpression, but null fields still print a zero.

[C-Box]

In Java is null not the same as 0 (Zero) !!!

 

So if you don't want to 0 values you should compare your field against 0 within the PrintWhenExpression

 

Something like this:

new Boolean($F{total}.intValue()>0)   (if it's an integer field)

 

hth

C-Box

[puperzenkarl]

 I know, but that is the problem. The field can be zero on purpose. In this case it would not be visible although it should be in the report. So I have to compare the value with null, but that seems to be impossible, because null fields will be initialized with zero when using java.lang.Integer.

[C-Box]

Hmm strange, within my reports (custom datasource) i get null for uninitialized Integerfields.

Where are your field values come from?

 

C-Box

[puperzenkarl]

I use the JRBeanArrayDataSource. The goal is, that uninitialized int values in the JavaBeans should not be visible in the report.