salut ! commuté, quelqu'un peut m'aider

j'ai une classe opération,
et versement ou retrait
qui hérite de opération

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@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 versement même chose avec retrait

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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
	}
quand j'effectue le mapping , j'obtient ça,
Nom : tabl.JPG Affichages : 1661 Taille : 35,1 Ko

et quand je fait l'enregistrement d'une opération tout ce passe bien et la lecture
voici comment je fait pour lire les données avec thymeleaf sachant que ma classe opération est hérite, le résultat est celui attendu
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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>

mais lorsque j'essaie d'imprimer en html ou pdf avec irepport j'obtiens une erreur
voila mon service

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@Autowired
	private ReportService service;
 
	  @GetMapping("/reportOperation/{format}") 
	  private String exportReportOperation(@PathVariable	  String format) throws FileNotFoundException, JRException {
 
	  return service.exportReportOperation(format); }
 
 
 
 
	  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;
 
	}
 
 
// 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;
	}
voici mon fichier jrxm
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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>

voila la résultat,
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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

si la communauté peut m'aider a trouver une solution