Develop Reference

How to print/display MathML expressions?

Currently I'm trying to use a textField with markup="html" but it's not working.
Example
<textField isStretchWithOverflow="true" isBlankWhenNull="true">
<reportElement positionType="Float" stretchType="RelativeToTallestObject" x="100" y="0" width="450" height="25" isPrintWhenDetailOverflows="true" uuid="1aeaa5e9-4136-4239-a301-2733598340d9">
<property name="com.jaspersoft.studio.unit.height" value="pixel"/>
<property name="com.jaspersoft.studio.unit.width" value="pixel"/>
</reportElement>
<textElement verticalAlignment="Middle" markup="html">
<paragraph lineSpacing="Single" leftIndent="5" rightIndent="3"/>
</textElement>
<textFieldExpression><![CDATA[$F{question}]]></textFieldExpression>
$F{question} contain:
"<p id="id"><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>A</mi><mo>+</mo><mo> </mo><mi>B</mi><mo> </mo><mo> </mo><msqrt><mi>c</mi><mfenced><mrow><mi>d</mi><mfenced open="[" close="]"><mi>r</mi></mfenced></mrow></mfenced></msqrt><mo> </mo><mi>δ</mi><mo> </mo><mo>∞</mo><mi mathvariant="normal">π</mi><mo> </mo></math></p>"
Expected Result :
Result which I get :

The textField does not support MathML, it only support very basic html nor can you use the html component since the JEditorPane on which it's built neither does support MathML
You will need an external library as for example jeuclid, once that you have this library in classpath you can render the xml to a BufferedImage using Converter.render and then display it in jasper report.
This can be done without a java helper class as in this example, hence writting all the code directly in the jrxml on 1 line (using the builder pattern below), but for clarity of example I'm will use external helper class.
Example
java
public class MathML {
public static BufferedImage getImage(String xml, float size) throws IOException, SAXException, ParserConfigurationException {
// Load the string to a node
Element node = DocumentBuilderFactory
.newInstance()
.newDocumentBuilder()
.parse(new ByteArrayInputStream(xml.getBytes(StandardCharsets.UTF_8)))
.getDocumentElement();
//Generate the layout parameter
MutableLayoutContext params = new LayoutContextImpl(
LayoutContextImpl.getDefaultLayoutContext());
params.setParameter(Parameter.MATHSIZE, size);
//Render the xml to a BufferedImage
return Converter.getInstance().render(node, params);
}
}
jrxml
<?xml version="1.0" encoding="UTF-8"?>
<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="Blank_A4_12" pageWidth="595" pageHeight="842" whenNoDataType="AllSectionsNoDetail" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="8deaea2e-3739-4c4e-b2b5-8c58773ab1a0">
<property name="com.jaspersoft.studio.data.defaultdataadapter" value="One Empty Record"/>
<queryString>
<![CDATA[]]>
</queryString>
<title>
<band height="50" splitType="Stretch">
<image>
<reportElement x="0" y="0" width="100" height="50" uuid="9ee17167-a91e-4725-b36e-a4bba5e24acb">
</reportElement>
<imageExpression><![CDATA[it.jdd.MathML.getImage("<math xmlns='http://www.w3.org/1998/Math/MathML'><mi>A</mi><mo>+</mo><mo> </mo><mi>B</mi><mo> </mo><mo> </mo><msqrt><mi>c</mi><mfenced><mrow><mi>d</mi><mfenced open='[' close=']'><mi>r</mi></mfenced></mrow></mfenced></msqrt><mo> </mo><mi>δ</mi><mo> </mo><mo>∞</mo><mi mathvariant='normal'>π</mi><mo> </mo></math>",70f)]]></imageExpression>
</image>
</band>
</title>
</jasperReport>
Output (export to pdf)

How to check if the value of BigDecimal field is negative in JasperReports

I am getting some strange negative values in my report, which could be from the database. I want to format fields to display zero when the values are negative in the expression editor. How can this be done?

You should use the BigDecimal.signum() method for check the sign of BigDecimal.
The expression will be:
<textFieldExpression><![CDATA[$P{bigDecimalValue}.signum() == -1 ? "0" : "Not negative big decimal"]]></textFieldExpression>
The expression for Double is simpler:
<textFieldExpression><![CDATA[$P{doubleValue} < 0 ? "0" : "Non negative double"]]></textFieldExpression>
The sample:
<?xml version="1.0" encoding="UTF-8"?>
<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="BigDecimal check" pageWidth="595" pageHeight="842" whenNoDataType="AllSectionsNoDetail" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20">
<property name="com.jaspersoft.studio.data.defaultdataadapter" value="One Empty Record"/>
<parameter name="doubleValue" class="java.lang.Double" isForPrompting="false">
<defaultValueExpression><![CDATA[1234.567]]></defaultValueExpression>
</parameter>
<parameter name="bigDecimalValue" class="java.math.BigDecimal" isForPrompting="false">
<defaultValueExpression><![CDATA[new BigDecimal(-9.8)]]></defaultValueExpression>
</parameter>
<title>
<band height="70">
<textField>
<reportElement x="10" y="10" width="300" height="15"/>
<textFieldExpression><![CDATA[$P{doubleValue} < 0.0 ? "0" : "Non negative double"]]></textFieldExpression>
</textField>
<textField>
<reportElement x="10" y="25" width="300" height="15"/>
<textFieldExpression><![CDATA[$P{bigDecimalValue}.signum() == -1 ? "0" : "Not negative big decimal"]]></textFieldExpression>
</textField>
</band>
</title>
</jasperReport>
The output result generated in Jaspersoft Studio will be:

JasperReports: Error creating table trying to use CrossTab without column group

I'm wondering if there is a way to make a table like this using the JapserReports CrossTab or in any other way where the row group is the field value7.
The DataSet used is a JRBeanCollectionDataSource(list of SubViews).
Where SubView is:
public class SubView{
//...
private String value1;
private String value2;
private String value3;
private String value4;
private String value5;
private String value6;
private String value7;
//...getters and setters...
}
Note that there is no need of a column group, but jasper doesn't compile successfully if I don't configure a column group (error message: Crosstab should have at least one column group).

This to me does not seem like a crosstab problem. Crosstab's are used when the columns are dynamic, hence your error message
Crosstab should have at least one column group.
since there is "no need of a column group" the result is achived using the normal detail band and grouping on value7.
So after you put the labels in the columnHeader and the values 1-6 in the detail band you add a grouping on value7 with a groupHeader band
Example (I have only included until value 3 in detail band to sorten the answer
<?xml version="1.0" encoding="UTF-8"?>
<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="report2" printOrder="Horizontal" pageWidth="595" pageHeight="842" whenNoDataType="AllSectionsNoDetail" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" isFloatColumnFooter="true" uuid="8944f542-2955-4224-933c-5a87fd36f527">
<queryString>
<![CDATA[]]>
</queryString>
<field name="value1" class="java.lang.String"/>
<field name="value2" class="java.lang.String"/>
<field name="value3" class="java.lang.String"/>
<field name="value7" class="java.lang.String"/>
<group name="Value7">
<groupExpression><![CDATA[$F{value7}]]></groupExpression>
<groupHeader>
<band height="21">
<textField>
<reportElement x="0" y="0" width="300" height="20" uuid="208ca6e5-b396-47cb-858b-71039f5bdf7a"/>
<textFieldExpression><![CDATA["Value 7: " + $F{value7}]]></textFieldExpression>
</textField>
</band>
</groupHeader>
</group>
<background>
<band/>
</background>
<columnHeader>
<band height="50">
<staticText>
<reportElement x="0" y="30" width="100" height="20" uuid="edf0f0f1-c979-4d20-987e-e8decb0b584a"/>
<text><![CDATA[value1]]></text>
</staticText>
<staticText>
<reportElement x="100" y="30" width="100" height="20" uuid="4287323f-e6d3-40d8-a2d4-44981bfa5c59"/>
<text><![CDATA[value2]]></text>
</staticText>
<staticText>
<reportElement x="200" y="30" width="100" height="20" uuid="b9aa7dfd-edd8-439b-b4c7-12916a740da8"/>
<text><![CDATA[value3]]></text>
</staticText>
</band>
</columnHeader>
<detail>
<band height="24">
<textField>
<reportElement x="0" y="0" width="100" height="20" uuid="2bcc436d-4c3a-4db1-a2ea-87edf92af98f"/>
<textFieldExpression><![CDATA[$F{value1}]]></textFieldExpression>
</textField>
<textField>
<reportElement x="100" y="0" width="100" height="20" uuid="f893721e-1aa6-44ca-9a9a-ac795ff63a0a"/>
<textFieldExpression><![CDATA[$F{value2}]]></textFieldExpression>
</textField>
<textField>
<reportElement x="200" y="0" width="100" height="20" uuid="36ad9612-620b-4eec-9608-f26b5306b01a"/>
<textFieldExpression><![CDATA[$F{value3}]]></textFieldExpression>
</textField>
</band>
</detail>
</jasperReport>
If you like to use crosstab anyway, you need to setup your dataset differently (since also columns become dynamic) check out this for examples: crosstab example

Jasperreport - send list of objects from Java application

I have a Java class with two attribute id (integer) and name (string). I have created a list of objects and I want to use the JasperReports to make a pdf file.
JRBeanCollectionDataSource ds = new JRBeanCollectionDataSource(conceptsList,true);
Map jasperParameters = new HashMap();
jasperParameters.put("Concepts", ds);
String input = "C:/report.jasper";
JasperPrint jp = JasperFillManager.fillReport(input, jasperParameters, new JREmptyDataSource());
JasperExportManager.exportReportToPdfFile(jp, "C:/report.pdf");
In iReport Designer I have one parameter (Concepts) and set net.sf.jasperreports.engine.data.JRBeanCollectionDataSource as a parameter class. I also define two fields id and name and put them in the details band. but my pdf file does not show anything. I think somewhere I have to define datasource for id and name but I cannot find anything. It would be great if anyone can help me.
<?xml version="1.0" encoding="UTF-8"?>
<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="report22" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="313d6b25-bcea-43a0-80db-2c7733499ca2">
<property name="ireport.zoom" value="1.0"/>
<property name="ireport.x" value="0"/>
<property name="ireport.y" value="0"/>
<parameter name="Concepts" class="net.sf.jasperreports.engine.data.JRBeanCollectionDataSource"/>
<queryString>
<![CDATA[]]>
</queryString>
<field name="id" class="java.lang.Integer"/>
<field name="name" class="java.lang.String"/>
<title>
<band height="50" splitType="Stretch"/>
</title>
<detail>
<band height="200" splitType="Stretch">
<textField>
<reportElement x="0" y="0" width="100" height="20" uuid="b6c2dc20-ebaa-4dfe-8d42-b8318bf05d33"/>
<textFieldExpression><![CDATA[$F{id}]]></textFieldExpression>
</textField>
<textField>
<reportElement x="100" y="0" width="100" height="20" uuid="fbc83087-e178-4210-a9f0-a8e1d86a5f71"/>
<textFieldExpression><![CDATA[$F{name}]]></textFieldExpression>
</textField>
</band>
</detail>

You can send the object data as a datasource to JRXML. Additionally, if the List should also be sent as a datasource to JRXML.
First design the iReport to accept Object as datasource:
1) Add the project "src" in class-path in iReport.
2) Specify the object package.className in JRXML report datasource.
3) Map the TextFields with the Object parameters.
Now in source code, use "JRBeanCollectionDataSource" Class for sending the List of Object in "JasperFillManager.fillReport()", for Connection.
Hope this helps.

how i can modify xml field value by sax parser

hi i am very new to Xml parsing
i want to change following attribute values frequently ...........
columnCount, width and height
After that i need to rewrite xml file with modified data
in following xml file by using java(sax ,Dom or jaxB parser) please any one can give some suggestion on it...............
=======================================================================================
<?xml version="1.0" encoding="UTF-8"?>
<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="Hello_subreport1_subreport1" language="groovy" columnCount="2" printOrder="Horizontal" pageWidth="520" pageHeight="802" columnWidth="260" leftMargin="0" rightMargin="0" topMargin="0" bottomMargin="0" uuid="ac19d62f-eac8-428e-8e0a-9011534189ed">
<property name="ireport.zoom" value="1.0"/>
<property name="ireport.x" value="0"/>
<property name="ireport.y" value="0"/>
<queryString>
<![CDATA[]]>
</queryString>
<field name="subjectName" class="java.lang.String">
<fieldDescription><![CDATA[subjectName]]></fieldDescription>
</field>
<field name="subjectID" class="java.lang.Integer">
<fieldDescription><![CDATA[subjectID]]></fieldDescription>
</field>
<field name="maxMarks" class="java.lang.Integer">
<fieldDescription><![CDATA[maxMarks]]></fieldDescription>
</field>
<field name="redMarks" class="java.lang.Float">
<fieldDescription><![CDATA[redMarks]]></fieldDescription>
</field>
<field name="passMarks" class="java.lang.Integer">
<fieldDescription><![CDATA[passMarks]]></fieldDescription>
</field>
<field name="marks" class="java.lang.Float">
<fieldDescription><![CDATA[marks]]></fieldDescription>
</field>
<background>
<band splitType="Stretch"/>
</background>
<detail>
<band height="52">
<textField isStretchWithOverflow="true">
<reportElement uuid="5f7665fb-9218-4434-a9e5-5eff306499b3" x="0" y="33" width="100" height="20"/>
<box>
<pen lineWidth="0.0"/>
<topPen lineWidth="0.0"/>
<leftPen lineWidth="0.0"/>
<bottomPen lineWidth="0.0"/>
<rightPen lineWidth="0.0"/>
</box>
<textElement>
<font size="12"/>
</textElement>
<textFieldExpression><![CDATA[$F{marks}]]></textFieldExpression>
</textField>
<textField>
<reportElement uuid="6b999cb1-600e-4634-be8f-7ac99e225f49" x="0" y="13" width="100" height="20"/>
<box>
<topPen lineWidth="0.25"/>
</box>
<textElement/>
<textFieldExpression><![CDATA[$F{subjectName}]]></textFieldExpression>
</textField>
</band>
</detail>
</jasperReport>
========================================================================

If you want to modify the document them use a DOM parser. This will transform the xml file into a datastructure where you can find the attributes and change their values. Have a look at jdom or dom4j, they are really easy to use.
A sax parser is a good choice if you only want to read the document. That parser just creates events while parsing the document.
Answering to your comment: I do not get a NPE but the rootNode.getChild("detail")) return null. That is because the element is associated with a namespace. Replace the last line in your sample code with
System.out.println(rootNode.getChild("detail", rootNode.getNamespace()));
That works.

there are tons of documents on web detailing editing of an XML. Explore them and then try something out. If you are stuck then post it here.
some ref: http://www.w3schools.com/dom/default.asp
How to modify XML data in Dom parser
http://www.mkyong.com/java/how-to-modify-xml-file-in-java-dom-parser/
http://www.drdobbs.com/jvm/easy-dom-parsing-in-java/231002580

Maybe you could use avc-binding-dom, which binds DOM nodes to your custom Java interface via annotations:
import org.w3c.dom.Node;
import net.avcompris.binding.annotation.XPath;
import net.avcompris.binding.dom.impl.DefaultDomBinder;
#Namespaces("xmlns:jr=http://jasperreports.sourceforge.net/jasperreports")
#XPath("/jr:jasperReport")
interface MyJasperReport {
#XPath("#columnCount")
int getColumnCount();
void setColumnCount(int columnCount);
#XPath("#pageWidth")
int getPageWidth();
void setPageWidth(int pageWidth);
#XPath("jr:property[#name = 'ireport.zoom']/#value")
String getZoom();
void setZoom(String zoom);
}
Node node = ... // You have to load the XML file into a DOM node.
MyJasperReport jr = new DefaultDomBinder().bind(node, MyJasperReport.class);
jr.setColumnCount(4); // previously: 2
jr.setPageWidth(1024); // previously: 520
jr.setZoom("1.45"); // previously: "1.0"
... // then save the DOM node into a XML file.