Voici ma classe principale

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import java.io.Serializable;
import java.time.LocalDate;
import java.util.Collection;
import java.util.Date;
 
import javax.persistence.DiscriminatorColumn;
import javax.persistence.DiscriminatorType;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
 
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
 
@Entity
@Data @NoArgsConstructor @AllArgsConstructor
public class Operation implements Serializable{
	@Id
	@GeneratedValue(strategy=GenerationType.IDENTITY)
	private Long numeroOperation;
	private LocalDate dateOperation;
	private double montant;
	private String designation;
	private String dtypeOp;
 
 
	  @ManyToOne
	  @JoinColumn(name="codeCaisse")
	  private Caisse caisse;
 
 
	 @ManyToOne
	 @JoinColumn(name="username")   
	 private Utilisateur  user;
 
	 @ManyToOne
	 @JoinColumn(name="iddepot")   
	 private Depositeur  depo;
 
}
et la classe qui hérite de l'operation
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@Entity
public class Versement extends Operation{
 
	public Versement() {
		super();
		// TODO Auto-generated constructor stub
	}
 
	public Versement(Long numeroOperation, LocalDate dateOperation, double montant, String designation, String dtypeOp,
			Caisse caisse, Utilisateur user, Depositeur depositeur) {
		super(numeroOperation, dateOperation, montant, designation, dtypeOp, caisse, user, depositeur);
		// TODO Auto-generated constructor stub
	}

pour afficher les données qui proviennent du model operation, voila comment je fais

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                     <table class="table table-striped">							
                         <thead>
							<tr><th>Numéro</th><th>Type</th><th>Date</th> <th>Motif</th><th>Montant</th></tr>
					     </thead>
					     <tbody>
					     	<tr th:each="e:${operation}">
							<td th:text="${e.numeroOperation}"></td> 
							<td th:text="${e.class.simpleName}"></td> 
							<td th:text="${e.dateOperation}"></td>
<!-- 							<td th:text="${e.depositeur.idClient}"></td> 
 -->							<td th:text="${e.designation}"></td> 
							<td th:text="${e.montant}"></td> 
							<!-- <td>
							<a th:href="@{deleteOperation(numeroOperation=${e.numeroOperation})}" class="btn btn-info"><i class="fas fa-eye"></i>Supprimer</a>
 
							</td>  -->
 
						</tr>

et le résultat et celui que 'attendait, par contre quand je veux imprimer en pdf ou html, j'ai une erreur

voici mon service pour imprimer

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// recuperation de laliste operation 
		private List<Operation> getOperation1() {
			List<Operation> o = new ArrayList<>();
			for (Operation oper : cDa.listSimple()) {
 
				 Map<String, Object> item = new HashMap<String, Object>();
			      item.put("dtypep", oper.getClass());
				  item.put("numero_operation", oper.getNumeroOperation());
			      item.put("date_operation", oper.getDateOperation());
			      item.put("montant", oper.getMontant());
			      item.put("designation", oper.getDesignation());
			      item.put("iddepot", oper.getDepo().getIdClient());
			      item.put("Caisse", oper.getCaisse().getCodeCaisse());
 
			o.add(oper);
			}
		return o;
	}
 
  public String exportReportOperation(String format) throws FileNotFoundException,  JRException { 
 
		   List<Operation> ls = cDa.listSimple();
 
		  String path = "C:\\Users\\kING\\Documents\\Reports";
		  //C:\Users\kING\Documents
 
		  File file = ResourceUtils.getFile("classpath:listOp.jrxml");
		  JasperReport jasper =	  JasperCompileManager.compileReport(file.getAbsolutePath());
 
		  JRBeanCollectionDataSource ds = new JRBeanCollectionDataSource(ls);
 
		  Map<String, Object> parameters = new HashMap<String, Object>();
		  parameters.put("creadBy", "Ma caisse"); JasperPrint jasperPrint =	  JasperFillManager.fillReport(jasper, parameters, ds);
 
		  if (format.equalsIgnoreCase("html")) {
		  JasperExportManager.exportReportToHtmlFile(jasperPrint, path	  +"\\listOp.html"); } 
 
		  if (format.equalsIgnoreCase("pdf")) {
		  JasperExportManager.exportReportToHtmlFile(jasperPrint, path	  +"\\listOp.pdf");
 
		  }
 
		  return " Votre fichier est dans  : "+path;
 
	}
 
 
private ReportService service;
 
	  @GetMapping("/reportOperation/{format}") 
	  private String exportReportOperation(@PathVariable	  String format) throws FileNotFoundException, JRException {
 
	  return service.exportReportOperation(format); }

voici mon fichier jrxml

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<?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="OperList" language="groovy" pageWidth="842" pageHeight="595" orientation="Landscape" columnWidth="802" leftMargin="20" rightMargin="20" topMargin="20" bottomMargin="20" uuid="2a20e923-268e-4547-9972-7dafed8a037a">
	<property name="ireport.zoom" value="1.0"/>
	<property name="ireport.x" value="0"/>
	<property name="ireport.y" value="0"/>
	<queryString>
		<![CDATA[]]>
	</queryString>
	<field name="class.simpleName" class="java.lang.String">
		<fieldDescription><![CDATA[]]></fieldDescription>
	</field>
	<field name="numero_operation" class="java.lang.Long">
		<fieldDescription><![CDATA[]]></fieldDescription>
	</field>
	<field name="date_operation" class="java.sql.Timestamp">
		<fieldDescription><![CDATA[]]></fieldDescription>
	</field>
	<field name="designation" class="java.lang.String">
		<fieldDescription><![CDATA[]]></fieldDescription>
	</field>
	<field name="montant" class="java.lang.Double">
		<fieldDescription><![CDATA[]]></fieldDescription>
	</field>
	<field name="code_caisse" class="java.lang.String">
		<fieldDescription><![CDATA[]]></fieldDescription>
	</field>
	<field name="iddepot" class="java.lang.Long">
		<fieldDescription><![CDATA[]]></fieldDescription>
	</field>
	<field name="username" class="java.lang.String">
		<fieldDescription><![CDATA[]]></fieldDescription>
	</field>
	<field name="dtype_op" class="java.lang.String">
		<fieldDescription><![CDATA[]]></fieldDescription>
	</field>
	<background>
		<band splitType="Stretch"/>
	</background>
	<title>
		<band height="79" splitType="Stretch"/>
	</title>
	<pageHeader>
		<band height="35" splitType="Stretch"/>
	</pageHeader>
	<columnHeader>
		<band height="20" splitType="Stretch">
			<staticText>
				<reportElement x="104" y="0" width="100" height="20" uuid="dc1534db-9f64-4b9c-8a2f-e89eca2821f0"/>
				<textElement textAlignment="Center">
					<font size="12" isBold="true"/>
				</textElement>
				<text><![CDATA[dtype_op]]></text>
			</staticText>
			<staticText>
				<reportElement x="242" y="0" width="100" height="20" uuid="97f4876b-5408-4766-b9c5-29ad16a3367b"/>
				<textElement textAlignment="Center">
					<font size="12" isBold="true"/>
				</textElement>
				<text><![CDATA[date_operation]]></text>
			</staticText>
			<staticText>
				<reportElement x="342" y="0" width="100" height="20" uuid="176e74bb-aed0-427a-888e-f5c5e39ec7e7"/>
				<textElement textAlignment="Center">
					<font size="12" isBold="true"/>
				</textElement>
				<text><![CDATA[designation]]></text>
			</staticText>
			<staticText>
				<reportElement x="204" y="0" width="38" height="20" uuid="5f3d16f5-9586-4ebd-a391-70c92d5fea7e"/>
				<textElement textAlignment="Center">
					<font size="12" isBold="true"/>
				</textElement>
				<text><![CDATA[numero_operation]]></text>
			</staticText>
			<staticText>
				<reportElement x="531" y="0" width="100" height="20" uuid="6632761e-617d-4044-91aa-3c3bd9d2640c"/>
				<textElement textAlignment="Center">
					<font size="12" isBold="true"/>
				</textElement>
				<text><![CDATA[montant]]></text>
			</staticText>
			<staticText>
				<reportElement x="442" y="0" width="100" height="20" uuid="1f148ebe-aa27-4f65-9b05-24df51ba20e2"/>
				<textElement textAlignment="Center">
					<font size="12" isBold="true"/>
				</textElement>
				<text><![CDATA[code_caisse]]></text>
			</staticText>
		</band>
	</columnHeader>
	<detail>
		<band height="21" splitType="Stretch">
			<textField>
				<reportElement x="104" y="0" width="100" height="20" uuid="40fe391f-2387-4041-ac3e-e6ad32be26fa"/>
				<box>
					<topPen lineWidth="1.0"/>
				</box>
				<textElement textAlignment="Center"/>
				<textFieldExpression><![CDATA[$F{class.simpleName}]]></textFieldExpression>
			</textField>
			<textField>
				<reportElement x="242" y="0" width="100" height="20" uuid="869a7411-4bb9-4bc9-9e64-b2908c6c846d"/>
				<textElement textAlignment="Center"/>
				<textFieldExpression><![CDATA[$F{date_operation}]]></textFieldExpression>
			</textField>
			<textField>
				<reportElement x="342" y="0" width="100" height="20" uuid="c4ebf4a2-1397-4393-86b7-7ed6a1a36fb6"/>
				<textElement textAlignment="Center"/>
				<textFieldExpression><![CDATA[$F{designation}]]></textFieldExpression>
			</textField>
			<textField>
				<reportElement x="204" y="0" width="38" height="20" uuid="0a23a2ea-87eb-418c-b5ee-ad49f19f4479"/>
				<textElement textAlignment="Center"/>
				<textFieldExpression><![CDATA[$F{numero_operation}]]></textFieldExpression>
			</textField>
			<textField>
				<reportElement x="531" y="0" width="100" height="20" uuid="674b8212-e375-4f8e-b880-a05cd9c35570"/>
				<textElement textAlignment="Center"/>
				<textFieldExpression><![CDATA[$F{montant}]]></textFieldExpression>
			</textField>
			<textField>
				<reportElement x="442" y="0" width="89" height="20" uuid="c3a362a9-14c6-46d5-8b0e-b8e21f889c55"/>
				<textElement textAlignment="Center"/>
				<textFieldExpression><![CDATA[$F{code_caisse}]]></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>

après exécution j'obtiens cette erreur

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Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.

Thu Sep 10 09:35:09 CEST 2020
There was an unexpected error (type=Internal Server Error, status=500).
Error retrieving field value from bean: .
net.sf.jasperreports.engine.JRException: Error retrieving field value from bean: .
	at net.sf.jasperreports.engine.data.JRAbstractBeanDataSource.getBeanProperty(JRAbstractBeanDataSource.java:205)
	at net.sf.jasperreports.engine.data.JRAbstractBeanDataSource.getFieldValue(JRAbstractBeanDataSource.java:170)
	at net.sf.jasperreports.engine.data.JRBeanCollectionDataSource.getFieldValue(JRBeanCollectionDataSource.java:104)
	at net.sf.jasperreports.engine.fill.JRFillDataset.setOldValues(JRFillDataset.java:1501)
	at net.sf.jasperreports.engine.fill.JRFillDataset.next(JRFillDataset.java:1402)
	at net.sf.jasperreports.engine.fill.JRFillDataset.next(JRFillDataset.java:1378)
	at net.sf.jasperreports.engine.fill.JRBaseFiller.next(JRBaseFiller.java:1194)
	at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReport(JRVerticalFiller.java:108)
	at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:615)
	at net.sf.jasperreports.engine.fill.BaseReportFiller.fill(BaseReportFiller.java:433)
	at net.sf.jasperreports.engine.fill.JRFiller.fill(JRFiller.java:162)
	at net.sf.jasperreports.engine.fill.JRFiller.fill(JRFiller.java:145)
	at net.sf.jasperreports.engine.JasperFillManager.fill(JasperFillManager.java:758)
	at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:1074)
	at com.king.report.ReportService.exportReportOperation(ReportService.java:143)
	at com.king.report.ReportClass.exportReportOperation(ReportClass.java:49)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190)
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:878)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:792)
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:626)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:320)
	at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:126)
	at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:90)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:118)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:158)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:200)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.csrf.CsrfFilter.doFilterInternal(CsrfFilter.java:117)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:92)
	at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:77)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
	at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:215)
	at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178)
	at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:358)
	at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:271)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1589)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NoSuchMethodException: Unknown property '' on class 'class com.king.entities.Versement'
	at org.apache.commons.beanutils.PropertyUtilsBean.getSimpleProperty(PropertyUtilsBean.java:1270)
	at org.apache.commons.beanutils.PropertyUtilsBean.getNestedProperty(PropertyUtilsBean.java:809)
	at org.apache.commons.beanutils.PropertyUtilsBean.getProperty(PropertyUtilsBean.java:885)
	at org.apache.commons.beanutils.PropertyUtils.getProperty(PropertyUtils.java:464)
	at net.sf.jasperreports.engine.data.JRAbstractBeanDataSource.getBeanProperty(JRAbstractBeanDataSource.java:185)
	... 101 more