NPE when added a second subreport

[2001 JI Open Discussion]

By: JC Tchitchiama - jeanch

NPE when added a second subreport

2002-10-01 02:50

Hi,

 

I am a jasper newbie so please be kind to me if my question is trivial or indeed has already been answered.

First of all congratulations for Jasper tool I think it's great and one can get a report together in no time at all.

 

Here is my query:

I have just appended a subreport to the MasterReport example and that works fine. Now I am adding a second report containing a picture and I get the following NPE

 

[java] java.lang.NullPointerException

[java] at dori.jasper.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:338)

[java] at dori.jasper.engine.fill.JRFillSubreport.run(JRFillSubreport.java:369)

[java] at java.lang.Thread.run(Thread.java:484)

 

Here is how the subreport is defined in the Master.xml

<subreport isUsingCache="true">

<reportElement x="5" y="25" width="500" height="20" backcolor="#FFFFDD"/>

<subreportParameter name="City"> <subreportParameterExpression>

$F{City} </subreportParameterExpression>

</subreportParameter>

<connectionExpression>

$P{REPORT_CONNECTION}

</connectionExpression>

<subreportExpression class="dori.jasper.engine.JasperReport">

"NewReport.jasper"

</subreportExpression>

</subreport>

 

Cheers

JC

 

 

By: Teodor Danciu - teodord

RE: NPE when added a second subreport

2002-10-01 02:56

 

Hi,

 

The "class" attribute of your

<subreportExpression> element should not be

"dori.jasper.engine.JasperReport", because you are

not supplying an in-memory report object,

but rather try to load it from disk.

 

This attribute should be "java.lang.String",

I suppose.

 

Read the "Quick Reference".

 

I hope this helps.

Teodor

 

 

 

By: JC Tchitchiama - jeanch

RE: NPE when added a second subreport

2002-10-01 08:20

Got it !!

when adding a subreport one must supply either a connectionExpression or a DataSource. Note that an empty data source is OK too when you don't have a data source per say.

 

Cheers

JC