Hi Olli **my stack:** ``` java.lang.NoClassDefFoundError: org/vaadin/olli

Hi Olli

my stack:


java.lang.NoClassDefFoundError: org/vaadin/olli/FileDownloadWrapper
	at br.com.fjsistemas.relatorios.RelatorioVendaView.lambda$5(RelatorioVendaView.java:127) ~[classes/:na]

	at com.vaadin.flow.component.ComponentEventBus.fireEventForListener(ComponentEventBus.java:205) ~[flow-server-2.6.3.jar:2.6.3]

	at com.vaadin.flow.component.ComponentEventBus.handleDomEvent(ComponentEventBus.java:373) ~[flow-server-2.6.3.jar:2.6.3]

	at com.vaadin.flow.component.ComponentEventBus.lambda$addDomTrigger$dd1b7957$1(ComponentEventBus.java:264) ~[flow-server-2.6.3.jar:2.6.3]

	at com.vaadin.flow.internal.nodefeature.ElementListenerMap.lambda$fireEvent$2(ElementListenerMap.java:443) ~[flow-server-2.6.3.jar:2.6.3]

	at java.base/java.util.ArrayList.forEach(ArrayList.java:1507) ~[na:na]

	at com.vaadin.flow.internal.nodefeature.ElementListenerMap.fireEvent(ElementListenerMap.java:443) ~[flow-server-2.6.3.jar:2.6.3]

	at com.vaadin.flow.server.communication.rpc.EventRpcHandler.handleNode(EventRpcHandler.java:61) ~[flow-server-2.6.3.jar:2.6.3]

	at com.vaadin.flow.server.communication.rpc.AbstractRpcInvocationHandler.handle(AbstractRpcInvocationHandler.java:66) ~[flow-server-2.6.3.jar:2.6.3]

	at com.vaadin.flow.server.communication.ServerRpcHandler.handleInvocationData(ServerRpcHandler.java:412) ~[flow-server-2.6.3.jar:2.6.3]

	at com.vaadin.flow.server.communication.ServerRpcHandler.lambda$handleInvocations$1(ServerRpcHandler.java:393) ~[flow-server-2.6.3.jar:2.6.3]

	at java.base/java.util.ArrayList.forEach(ArrayList.java:1507) ~[na:na]

	at com.vaadin.flow.server.communication.ServerRpcHandler.handleInvocations(ServerRpcHandler.java:393) ~[flow-server-2.6.3.jar:2.6.3]

	at com.vaadin.flow.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:320) ~[flow-server-2.6.3.jar:2.6.3]

	at com.vaadin.flow.server.communication.UidlRequestHandler.synchronizedHandleRequest(UidlRequestHandler.java:92) ~[flow-server-2.6.3.jar:2.6.3]

	at com.vaadin.flow.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:40) ~[flow-server-2.6.3.jar:2.6.3]

	at com.vaadin.flow.server.VaadinService.handleRequest(VaadinService.java:1570) ~[flow-server-2.6.3.jar:2.6.3]

	at com.vaadin.flow.server.VaadinServlet.service(VaadinServlet.java:252) ~[flow-server-2.6.3.jar:2.6.3]

	at com.vaadin.flow.spring.SpringServlet.service(SpringServlet.java:111) ~[vaadin-spring-12.4.0.jar:na]

	at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) ~[tomcat-embed-core-9.0.45.jar:4.0.FR]

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) ~[tomcat-embed-core-9.0.45.jar:9.0.45]

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.45.jar:9.0.45]

	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:710) ~[tomcat-embed-core-9.0.45.jar:9.0.45]

	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:457) ~[tomcat-embed-core-9.0.45.jar:9.0.45]

	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:352) ~[tomcat-embed-core-9.0.45.jar:9.0.45]

	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:312) ~[tomcat-embed-core-9.0.45.jar:9.0.45]

	at org.springframework.web.servlet.mvc.ServletForwardingController.handleRequestInternal(ServletForwardingController.java:141) ~[spring-webmvc-5.3.6.jar:5.3.6]

	at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:177) ~[spring-webmvc-5.3.6.jar:5.3.6]

	at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:52) ~[spring-webmvc-5.3.6.jar:5.3.6]

	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1060) ~[spring-webmvc-5.3.6.jar:5.3.6]

	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:962) ~[spring-webmvc-5.3.6.jar:5.3.6]

	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.6.jar:5.3.6]

	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909) ~[spring-webmvc-5.3.6.jar:5.3.6]

	at javax.servlet.http.HttpServlet.service(HttpServlet.java:652) ~[tomcat-embed-core-9.0.45.jar:4.0.FR]

	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.6.jar:5.3.6]

	at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) ~[tomcat-embed-core-9.0.45.jar:4.0.FR]

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) ~[tomcat-embed-core-9.0.45.jar:9.0.45]

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.45.jar:9.0.45]

	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.45.jar:9.0.45]

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.45.jar:9.0.45]

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.45.jar:9.0.45]

	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.6.jar:5.3.6]

	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.6.jar:5.3.6]

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.45.jar:9.0.45]

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.45.jar:9.0.45]

	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.6.jar:5.3.6]

	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.6.jar:5.3.6]

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.45.jar:9.0.45]

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.45.jar:9.0.45]

	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.6.jar:5.3.6]

	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.3.6.jar:5.3.6]

	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.45.jar:9.0.45]

	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.45.jar:9.0.45]

	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) ~[tomcat-embed-core-9.0.45.jar:9.0.45]

	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) ~[tomcat-embed-core-9.0.45.jar:9.0.45]

	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542) ~[tomcat-embed-core-9.0.45.jar:9.0.45]

	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143) ~[tomcat-embed-core-9.0.45.jar:9.0.45]

	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) ~[tomcat-embed-core-9.0.45.jar:9.0.45]

	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) ~[tomcat-embed-core-9.0.45.jar:9.0.45]

	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357) ~[tomcat-embed-core-9.0.45.jar:9.0.45]

	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374) ~[tomcat-embed-core-9.0.45.jar:9.0.45]

	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) ~[tomcat-embed-core-9.0.45.jar:9.0.45]

	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:893) ~[tomcat-embed-core-9.0.45.jar:9.0.45]

	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1707) ~[tomcat-embed-core-9.0.45.jar:9.0.45]

	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) ~[tomcat-embed-core-9.0.45.jar:9.0.45]

	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) ~[na:na]

	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) ~[na:na]

	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) ~[tomcat-embed-core-9.0.45.jar:9.0.45]

	at java.base/java.lang.Thread.run(Thread.java:830) ~[na:na]

Caused by: java.lang.ClassNotFoundException: org.vaadin.olli.FileDownloadWrapper
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:602) ~[na:na]

	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178) ~[na:na]

	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521) ~[na:na]

	at java.base/java.lang.Class.forName0(Native Method) ~[na:na]

	at java.base/java.lang.Class.forName(Class.java:416) ~[na:na]

	at org.springframework.boot.devtools.restart.classloader.RestartClassLoader.loadClass(RestartClassLoader.java:145) ~[spring-boot-devtools-2.4.5.jar:2.4.5]

	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521) ~[na:na]

... 69 common frames omitted

jrxml to pdf converter

package br.com.fjsistemas.relatorios;

import java.io.ByteArrayOutputStream;
import java.sql.SQLException;

import javax.sql.DataSource;

import org.springframework.stereotype.Component;

import br.com.fjsistemas.repository.VendaRepository;
import net.sf.jasperreports.engine.JRException;
import net.sf.jasperreports.engine.JasperCompileManager;
import net.sf.jasperreports.engine.JasperExportManager;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.JasperReport;

@Component
public class ConverteJrxmlToPdf {

	@SuppressWarnings("unused")
	private VendaRepository vendaRepository;

	private DataSource dataSource;

	public ConverteJrxmlToPdf(VendaRepository vendaRepository, DataSource dataSource) {
		this.vendaRepository = vendaRepository;
		this.dataSource = dataSource;
	}

	public byte[] conversor() throws JRException, SQLException {

		JasperReport document = JasperCompileManager.compileReport(
				"C:\\Users\\fjd2320\\eclipse-workspace\\fjsistemas-vendas-vaadin\\src\\main\\resources\\RelatorioVendas.jrxml");

		JasperPrint print = JasperFillManager.fillReport(document, null, dataSource.getConnection());

		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		JasperExportManager.exportReportToPdfStream(print, baos);
		byte[] relatorio = baos.toByteArray();

		return relatorio;
	}

}

**
button:**

exportarRelatorio.addThemeVariants(ButtonVariant.LUMO_PRIMARY);
		exportarRelatorio.getStyle().set("margin-top", "37px");
		exportarRelatorio.setWidth("180px");
		exportarRelatorio.addClickListener(event -> {

			FileDownloadWrapper buttonWrapper = new FileDownloadWrapper(
					new StreamResource("RelatorioVenda.pdf", () -> {
						try {
							return new ByteArrayInputStream(pdf.conversor());
						} catch (JRException e) {
							// TODO Auto-generated catch block
							e.printStackTrace();
						} catch (SQLException e) {
							// TODO Auto-generated catch block
							e.printStackTrace();
						}
						return null;
					})
				);
			buttonWrapper.wrapComponent(exportarRelatorio);
			add(buttonWrapper);
		});

java.lang.NoClassDefFoundError: org/vaadin/olli/FileDownloadWrapper sounds like a classpath issue. Adding the dependency in pom.xml with provided scope could cause this, so you should remove the provided if you’re doing that. Otherwise, I have no idea.

thank you Olli, it was really like you said, now everything is working… for those who have the same problem, the solution is in dependence, which should look like this:

<dependency>
        <groupId>org.vaadin.olli</groupId>
        <artifactId>file-download-wrapper</artifactId>
        <version>3.0.1</version>
        <scope>provided</scope>
        </dependency>