test case for jasper preview bug - https://community.jaspersoft.com/jaspersoft-studio/issues/3831

Logger.java

package org.slf4j;

public class Logger {
	public static String test() {
		System.out.println("inside Logger.test");
		return "Logger.test result";
	}
}

Slf4jTest.jrxml

<?xml version="1.0" encoding="UTF-8"?>
<!-- Created with Jaspersoft Studio version 6.20.1.final using JasperReports Library version 6.20.1-7584acb244139816654f64e2fd57a00d3e31921e  -->
<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" pageWidth="595" pageHeight="842" columnWidth="555" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="f037d449-73e2-4a90-ad28-8e72b0c29383">
	<scriptlet name="SL_TEST" class="test.Test"/>
	<queryString>
		<![CDATA[]]>
	</queryString>
	<background>
		<band splitType="Stretch"/>
	</background>
	<title>
		<band height="79" splitType="Stretch"/>
	</title>
	<pageHeader>
		<band height="35" splitType="Stretch"/>
	</pageHeader>
	<columnHeader>
		<band height="61" splitType="Stretch"/>
	</columnHeader>
	<detail>
		<band height="125" splitType="Stretch">
			<textField>
				<reportElement x="270" y="51" width="100" height="30" uuid="4b502d1c-afef-4c24-8b4a-3a703ebe4aef"/>
				<textFieldExpression><![CDATA[$P{SL_TEST_SCRIPTLET}.test()]]></textFieldExpression>
			</textField>
		</band>
	</detail>
	<columnFooter>
		<band height="45" splitType="Stretch"/>
	</columnFooter>
	<pageFooter>
		<band height="54" splitType="Stretch"/>
	</pageFooter>
	<summary>
		<band height="42" splitType="Stretch"/>
	</summary>
</jasperReport>

Test.java

package test;

import org.slf4j.Logger;

public class Test extends net.sf.jasperreports.engine.JRDefaultScriptlet{
	public static String test() {
		System.out.println("this ClassLoader");
		System.out.println(Test.class.getClassLoader());
		System.out.println("---------------");
		System.out.println("Class");
		System.out.println(Logger.class);
		System.out.println("ClassLoader");
		System.out.println(Logger.class.getClassLoader());
		System.out.println(Logger.test());
		return "Test.test result";
	}
	public static void main(String[] args) {
		System.out.print(test());
	}
}