[when am trying to get pdf i got empty pdf. anyone can help me]

have you compiled your jrxml file into jasper object.
secondly why are u using this implementation of JasperRunManager.runReportToPdf when your Connection object is null, instead use a JREmptyDataSource.(possibly JasperEngine is trying to use Connection object to open a connection and getting a null pointer exception)

 

[Can we have multiple text fields in crossTabHeader Cell using dynamic jasper.]

I am using FastReportBuilder, DJCrosstab, CrosstabBuilder and similar classes to build my dynamic jasper report. I want to have a crosstabheader cell with multiple text fields using dynamic jasper, I am getting the required report format by manually changing the JRXML. Can this be done by dynamic jasper? Here is what I need in JRXML.

<crosstabHeaderCell>

<cellContents backcolor="#D0F2DC" mode="Opaque">

<textField isStretchWithOverflow="true">

<reportElement x="0" y="0" width="375" height="70"/>

<box>

<topPen lineWidth="0.5" lineStyle="Solid" lineColor="#000000"/>

<leftPen lineWidth="0.5" lineStyle="Solid" lineColor="#000000"/>

<bottomPen lineWidth="0.5" lineStyle="Solid" lineColor="#000000"/>

<rightPen lineWidth="0.5" lineStyle="Solid" lineColor="#000000"/>

</box>

<textElement/>

<textFieldExpression><![CDATA["Val1, Val2 vs.nVal3, Val4"]]></textFieldExpression>

</textField>

<textField isStretchWithOverflow="true">

<reportElement x="0" y="35" width="300" height="35"/>

<box>

<topPen lineWidth="0.5" lineStyle="Solid" lineColor="#000000"/>

<leftPen lineWidth="0.5" lineStyle="Solid" lineColor="#000000"/>

<bottomPen lineWidth="0.5" lineStyle="Solid" lineColor="#000000"/>

<rightPen lineWidth="0.5" lineStyle="Solid" lineColor="#000000"/>

</box>

<textElement/>

<textFieldExpression><![CDATA["Val3"]]></textFieldExpression>

</textField>

<textField isStretchWithOverflow="true">

<reportElement x="300" y="35" width="74" height="35"/>

<box>

<topPen lineWidth="0.5" lineStyle="Solid" lineColor="#000000"/>

<leftPen lineWidth="0.5" lineStyle="Solid" lineColor="#000000"/>

<bottomPen lineWidth="0.5" lineStyle="Solid" lineColor="#000000"/>

<rightPen lineWidth="0.5" lineStyle="Solid" lineColor="#000000"/>

</box>

<textElement/>

<textFieldExpression><![CDATA["Val4"]]></textFieldExpression>

</textField>

</cellContents>

</crosstabHeaderCell>