Working with multiple data sources in jaspersoft studio

[iman.gharib]

Original question: http://stackoverflow.com/q/38720986/4262423

After being able to add custom data source from java bean to a report according to http://stackoverflow.com/a/38535589/4262423, I get to the second point of my reporting with jasper. I have a main report which uses a data base as its data source. Then I add a bean.xml data source to the report and add a table to the main report which uses this bean.xml data source to get java beans. My goal is to get a field value from the main report and manipulate its value, then fill the beans with these values and at last fill the table with the beans. For doing that I have written 3 classes which I use as Scriptlet in the table data set:

This is an illustration of what I need to do:

http://i.stack.imgur.com/9Ro1F.jpg

The problem is in FillTable class, when I us `String kNFormelGG = (String) this.getParameterValue("gg");` the created bean.xml fails the test connection with `java.lang.reflect.InvocationTargetException`

Caused by: java.lang.NullPointerException
    at net.sf.jasperreports.engine.JRAbstractScriptlet.getParameterValue(JRAbstractScriptlet.java:95)
    at net.sf.jasperreports.engine.JRAbstractScriptlet.getParameterValue(JRAbstractScriptlet.java:86)
    at org.iqtig.reporting.dataSource.bean.dataSourceXML.FillTable.fillTable(FillTable.java:45)
    at org.iqtig.reporting.dataSource.bean.dataSourceXML.JRDataSourceFactory.createCollection(JRDataSourceFactory.java:27)
    ... 34 more

If I assign a fix value like `String kNFormelGG ="Test me"` the bean connection encounters no error and after assigning bean.xml as the value for Default Data Adapter in Dataset1 it fills the table with static values.
How can get the data from a parameter or a value dynamically from the main report data source and use it in beans?
I have this assumption that at the time of calling the static factory class from my adapter, the fields are still empty. Maybe I am wrong but I do not find any other declaration for this problem.

**BeanFactory Class**

import java.util.Collection;    import net.sf.jasperreports.engine.JRDefaultScriptlet;    import net.sf.jasperreports.engine.JRScriptletException;    /**     * Factory for TableCellsBean Klasse     *     * @author iman.gharib     */    public class JRDataSourceFactory extends JRDefaultScriptlet {    /**     * @return collection der TableCellsBean Objekten     * @throws JRScriptletException     */    public static Collection<TableCellsBean> createCollection()            throws JRScriptletException {        FillTable ft = new FillTable();        Collection<TableCellsBean> reportRows = ft.fillTable();        return reportRows;    }    }[/code]

Bean Class

public class TableCellsBean {    private String fieldName;    private String keyFormel;    private String mK;    private String notation;    private String item;    /**     * Constructor.     *     * @param fieldName     * @param keyFormel     * @param mK     * @param notation     * @param item     */    public TableCellsBean(final String fieldName, final String keyFormel, final String mK, final String notation, final String item) {        this.fieldName = fieldName;        this.keyFormel = keyFormel;        this.mK = mK;        this.notation = notation;        this.item = item;    }    /**     * Constructo Leer     */    public TableCellsBean() {    }    public TableCellsBean getme() {        return this;    }    // getter and setters    }**Class for preparing and creating beans**    public class FillTable extends JRDefaultScriptlet {    @Override    public void afterColumnInit()            throws JRScriptletException {        fillTable();    }    public ArrayList<String> splitGGArray(final String kNFormelGG) {        ArrayList<String> fieldNames = new ArrayList<>();        String[] array = (kNFormelGG.split(" "));        for (String sub : array) {            fieldNames.add(sub);        }        return fieldNames;    }    public Collection<TableCellsBean> fillTable()            throws JRScriptletException {     // gg is a parameter for table dataset. It is mapped to KN_FormelGG     // which comes from the main report data base        String kNFormelGG = (String) this.getParameterValue("gg");        List<TableCellsBean> listTableCells = new ArrayList<>();        // TableCellsBean tableCell = new TableCellsBean();        for (String fn : splitGGArray(kNFormelGG)) {            listTableCells.add(new TableCellsBean(fn, fn, fn, fn, fn));            // listTableCells.add(tableCell);        }        // JRBeanCollectionDataSource tableCellJRBean = new JRBeanCollectionDataSource(listTableCells);        // Map<String, Object> parameters = new HashMap<>();        // parameters.put("FieldDataSource", tableCellJRBean);        return listTableCells;    }    }[/code]

JRXML

<?xml version="1.0" encoding="UTF-8"?>    <!-- Created with Jaspersoft Studio version 6.3.0.final using JasperReports Library version 6.3.0  -->    <!-- 2016-08-08T14:30:03 -->    <jasperReport xmlns="http://jasperreports.sourceforge.net/jasperreports" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports http://jasperreports.sourceforge.net/xsd/jasperreport.xsd" name="main" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="4f1480cf-f8f9-420f-96b4-7fc1e41e791b">        <property name="com.jaspersoft.studio.data.sql.tables" value=""/>        <property name="com.jaspersoft.studio.data.defaultdataadapter" value="QIDBReport"/>        <style name="Table_TH" mode="Opaque" backcolor="#F0F8FF">            <box>                <pen lineWidth="0.5" lineColor="#000000"/>                <topPen lineWidth="0.5" lineColor="#000000"/>                <leftPen lineWidth="0.5" lineColor="#000000"/>                <bottomPen lineWidth="0.5" lineColor="#000000"/>                <rightPen lineWidth="0.5" lineColor="#000000"/>            </box>        </style>        <style name="Table_CH" mode="Opaque" backcolor="#BFE1FF">            <box>                <pen lineWidth="0.5" lineColor="#000000"/>                <topPen lineWidth="0.5" lineColor="#000000"/>                <leftPen lineWidth="0.5" lineColor="#000000"/>                <bottomPen lineWidth="0.5" lineColor="#000000"/>                <rightPen lineWidth="0.5" lineColor="#000000"/>            </box>        </style>        <style name="Table_TD" mode="Opaque" backcolor="#FFFFFF">            <box>                <pen lineWidth="0.5" lineColor="#000000"/>                <topPen lineWidth="0.5" lineColor="#000000"/>                <leftPen lineWidth="0.5" lineColor="#000000"/>                <bottomPen lineWidth="0.5" lineColor="#000000"/>                <rightPen lineWidth="0.5" lineColor="#000000"/>            </box>        </style>        <subDataset name="Dataset1" uuid="5677929d-813b-4d39-828c-de966a9d7689">            <property name="com.jaspersoft.studio.data.defaultdataadapter" value="bean.xml"/>            <property name="net.sf.jasperreports.data.adapter" value="bean.xml"/>            <scriptlet name="Scriptlet_1" class="org.iqtig.reporting.dataSource.bean.mapBeanAsDatasource.JRDataSourceFactory"/>            <parameter name="gg" class="java.lang.String"/>            <field name="item" class="java.lang.String">                <fieldDescription><![CDATA[item]]></fieldDescription>            </field>            <field name="fieldName" class="java.lang.String">                <fieldDescription><![CDATA[fieldName]]></fieldDescription>            </field>            <field name="me" class="org.iqtig.reporting.dataSource.bean.dataSourceXML.TableCellsBean">                <fieldDescription><![CDATA[me]]></fieldDescription>            </field>            <field name="keyFormel" class="java.lang.String">                <fieldDescription><![CDATA[keyFormel]]></fieldDescription>            </field>            <field name="mK" class="java.lang.String">                <fieldDescription><![CDATA[mK]]></fieldDescription>            </field>        </subDataset>        <parameter name="LB_ID" class="java.lang.Integer">            <defaultValueExpression><![CDATA[62]]></defaultValueExpression>        </parameter>        <parameter name="KN_OffeziellGruppe" class="java.lang.Integer">            <defaultValueExpression><![CDATA[3]]></defaultValueExpression>        </parameter>        <parameter name="FieldDataSource" class="net.sf.jasperreports.engine.data.JRBeanCollectionDataSource" isForPrompting="false"/>        <parameter name="KN_FormelGG" class="java.lang.String" isForPrompting="false"/>        <queryString>            <![CDATA[select * from "KennzahlReferenz2015_QIBericht",  "Images"    where LB_ID =  $P{LB_ID}    and KN_OffiziellGruppe =  $P{KN_OffeziellGruppe}    and  IMG_ID = 1]]>        </queryString>        <field name="QI_Praefix" class="java.lang.String"/>        <field name="KN_Id" class="java.lang.Integer"/>        <field name="bewertungsArtTypNameKurz" class="java.lang.String"/>        <field name="refbereich" class="java.lang.String"/>        <field name="refbereichVorjahres" class="java.lang.String"/>        <field name="KN_GGAlleinstehend" class="java.lang.String"/>        <field name="erlaueterungDerRechregeln" class="java.lang.String"/>        <field name="teildatensatzbezug" class="java.lang.String"/>        <field name="mindesanzahlZaeler" class="java.lang.Integer"/>        <field name="mindesanzahlNenner" class="java.lang.Integer"/>        <field name="KN_FormelZ" class="java.lang.String"/>        <field name="KN_FormelGG" class="java.lang.String"/>        <field name="verwendeteFunktionen" class="java.lang.String"/>        <field name="idLb" class="java.lang.String"/>        <field name="LB_LangBezeichnung" class="java.lang.String"/>        <field name="LB_ID" class="java.lang.Integer"/>        <field name="nameAlleinstehend" class="java.lang.String"/>        <field name="KN_BezeichnungAlleinstehendKurz" class="java.lang.String"/>        <field name="QI_ID" class="java.lang.Integer"/>        <field name="IMG_ID" class="java.lang.Integer"/>        <field name="Name" class="java.lang.String"/>        <field name="Image" class="java.lang.Object"/>        <group name="id" isStartNewPage="true">            <groupExpression><![CDATA[$F{KN_Id}]]></groupExpression>            <groupHeader>                <band height="44"/>            </groupHeader>            <groupFooter>                <band height="50"/>            </groupFooter>        </group>        <background>            <band splitType="Stretch"/>        </background>        <title>            <band height="44" splitType="Stretch"/>        </title>        <pageHeader>            <band height="35" splitType="Stretch"/>        </pageHeader>        <columnHeader>            <band height="34" splitType="Stretch"/>        </columnHeader>        <detail>            <band height="149" splitType="Stretch">                <componentElement>                    <reportElement x="170" y="20" width="350" height="100" uuid="38d917fb-dfc2-4c08-890a-09cfe6e2214d">                        <property name="com.jaspersoft.studio.layout" value="com.jaspersoft.studio.editor.layout.VerticalRowLayout"/>                        <property name="com.jaspersoft.studio.table.style.table_header" value="Table_TH"/>                        <property name="com.jaspersoft.studio.table.style.column_header" value="Table_CH"/>                        <property name="com.jaspersoft.studio.table.style.detail" value="Table_TD"/>                        <property name="net.sf.jasperreports.export.headertoolbar.table.name" value=""/>                        <property name="com.jaspersoft.studio.components.autoresize.proportional" value="true"/>                    </reportElement>                    <jr:table xmlns:jr="http://jasperreports.sourceforge.net/jasperreports/components" xsi:schemaLocation="http://jasperreports.sourceforge.net/jasperreports/components http://jasperreports.sourceforge.net/xsd/components.xsd" whenNoDataType="AllSectionsNoDetail">                        <datasetRun subDataset="Dataset1" uuid="1b3548f6-7d6b-4070-bb8e-aaefbabdc7c9">                            <datasetParameter name="gg">                                <datasetParameterExpression><![CDATA[$F{KN_FormelGG}]]></datasetParameterExpression>                            </datasetParameter>                        </datasetRun>                        <jr:column width="70" uuid="048812d7-0ed1-4db8-a09a-e6242f77c6ce">                            <property name="com.jaspersoft.studio.components.table.model.column.name" value="Column1"/>                            <jr:tableHeader style="Table_TH" height="30" rowSpan="1"/>                            <jr:detailCell style="Table_TD" height="30">                                <textField>                                    <reportElement x="0" y="0" width="70" height="30" uuid="c5aaea84-1367-41df-be8d-7f71e3ea5153"/>                                    <textFieldExpression><![CDATA[$F{item}]]></textFieldExpression>                                </textField>                            </jr:detailCell>                        </jr:column>                        <jr:column width="70" uuid="11b85ada-c9fe-42b6-a646-8bd1697cdec2">                            <property name="com.jaspersoft.studio.components.table.model.column.name" value="Column2"/>                            <jr:tableHeader style="Table_TH" height="30" rowSpan="1"/>                            <jr:detailCell style="Table_TD" height="30">                                <textField>                                    <reportElement x="0" y="0" width="70" height="30" uuid="728ff44d-1dbd-404c-b8b3-7cc0e1f07f60"/>                                    <textFieldExpression><![CDATA[$F{fieldName}]]></textFieldExpression>                                </textField>                            </jr:detailCell>                        </jr:column>                        <jr:column width="70" uuid="892f30cb-fb41-444f-889b-1e005484c35e">                            <property name="com.jaspersoft.studio.components.table.model.column.name" value="Column3"/>                            <jr:tableHeader style="Table_TH" height="30" rowSpan="1"/>                            <jr:detailCell style="Table_TD" height="30">                                <textField>                                    <reportElement x="0" y="0" width="70" height="30" uuid="e38ac951-71bc-45a6-8ed2-313805a77050"/>                                    <textFieldExpression><![CDATA[$F{keyFormel}]]></textFieldExpression>                                </textField>                            </jr:detailCell>                        </jr:column>                        <jr:column width="70" uuid="7d0d700a-5a75-4c26-94c0-9ef7c53bd719">                            <property name="com.jaspersoft.studio.components.table.model.column.name" value="Column4"/>                            <jr:tableHeader style="Table_TH" height="30" rowSpan="1">                                <textField>                                    <reportElement x="0" y="0" width="70" height="30" uuid="68577007-0344-406c-8aa2-3127d1da1c65"/>                                </textField>                            </jr:tableHeader>                            <jr:detailCell style="Table_TD" height="30">                                <textField>                                    <reportElement x="0" y="0" width="70" height="30" uuid="873d63c1-1b91-4441-b7bd-f67db7729e7f"/>                                    <textFieldExpression><![CDATA[$F{mK}]]></textFieldExpression>                                </textField>                            </jr:detailCell>                        </jr:column>                        <jr:column width="70" uuid="cf5a1a2f-594d-429f-8925-62d001e1dd00">                            <property name="com.jaspersoft.studio.components.table.model.column.name" value="Column5"/>                            <jr:tableHeader style="Table_TH" height="30" rowSpan="1">                                <textField>                                    <reportElement x="0" y="0" width="70" height="30" uuid="7fb46eb8-d0e1-44ab-89f9-ec31d49b8109"/>                                    <textFieldExpression><![CDATA[$P{gg}]]></textFieldExpression>                                </textField>                            </jr:tableHeader>                            <jr:detailCell style="Table_TD" height="30"/>                        </jr:column>                    </jr:table>                </componentElement>                <textField>                    <reportElement x="20" y="80" width="100" height="30" uuid="b89cd04c-2569-43ef-9730-445b874855dd"/>                    <textFieldExpression><![CDATA[$F{KN_FormelGG}]]></textFieldExpression>                </textField>                <staticText>                    <reportElement x="20" y="32" width="100" height="30" uuid="e91b4461-5e53-4f85-8992-14e69a1aa05f"/>                    <text><![CDATA[KN_FormelGG]]></text>                </staticText>            </band>        </detail>        <columnFooter>            <band height="45" splitType="Stretch"/>        </columnFooter>        <pageFooter>            <band height="54" splitType="Stretch"/>        </pageFooter>        <summary>            <band height="42" splitType="Stretch"/>        </summary>    </jasperReport>[/code]