Ejemplo 1: pasar json como fuente de datos a la biblioteca de informes jasper
<?xml version="1.0" encoding="UTF-8"?>
<!-- Created with Jaspersoft Studio version 6.1.1.final using JasperReports Library version 6.1.1 -->
<!-- 2015-10-22T13:45:32 -->
<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_2" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="9e494ebe-c1fb-4448-bcee-38994e9720f7">
<!--property name="net.sf.jasperreports.json.source" value="emp.json"/-->
<queryString language="json">
<![CDATA[employees]]>
</queryString>
<field name="firstName" class="java.lang.String">
<fieldDescription><![CDATA[firstName]]></fieldDescription>
</field>
<field name="lastName" class="java.lang.String">
<fieldDescription><![CDATA[lastName]]></fieldDescription>
</field>
<background>
<band splitType="Stretch"/>
</background>
<detail>
<band height="125" splitType="Stretch">
<textField>
<reportElement x="100" y="0" width="100" height="30" uuid="02b279da-3795-4655-8571-5a36a3ef378c"/>
<textFieldExpression><![CDATA[$F{firstName}]]></textFieldExpression>
</textField>
<staticText>
<reportElement x="0" y="0" width="100" height="30" uuid="671e61ad-8d8f-48cb-969f-78c05a516398"/>
<text><![CDATA[firstName]]></text>
</staticText>
<textField>
<reportElement x="100" y="30" width="100" height="30" uuid="9d53f46f-a252-48b3-9213-8c3092c29f49"/>
<textFieldExpression><![CDATA[$F{lastName}]]></textFieldExpression>
</textField>
<staticText>
<reportElement x="0" y="30" width="100" height="30" uuid="3b49affb-685a-4df2-a872-c0e6fdcab94b"/>
<text><![CDATA[lastName]]></text>
</staticText>
</band>
</detail>
</jasperReport>
Ejemplo 2: cómo agregar una fuente de datos json en jasperserver
<Resource name="jdbc/json" auth="Container" type="javax.sql.DataSource" driverClassName="cdata.jdbc.json.JSONDriver" url="jdbc:json:URI=C:people.json;DataModel=Relational;" maxActive="20" maxIdle="10" maxWait="-1" factory="com.jaspersoft.jasperserver.tomcat.jndi.JSCommonsBasicDataSourceFactory"/>
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