DragAndDrop

JavaVaadin · February 26, 2019, 6:45pm

Hi.
Doesn’t vaadin 10 support drag and drop components yet?

I badly need this functionality…

Please, reply.

Syam3 · February 27, 2019, 6:50am

As per the road map, it will be available in the near future.
However, in the meanwhile, you may use the following add-on:
[https://vaadin.com/directory/component/html5-drag-and-drop-extension]
(https://vaadin.com/directory/component/html5-drag-and-drop-extension)

JavaVaadin · February 27, 2019, 6:55am

Syam Pillai:
As per the road map, it will be available in the near future.
However, in the meanwhile, you may use the following add-on:
[https://vaadin.com/directory/component/html5-drag-and-drop-extension]
(https://vaadin.com/directory/component/html5-drag-and-drop-extension)

Do i have to download something there or just copy and paste the code?

I checked DragSourceExtension but it doesn’t exist in vaadin 10.

ollit.1 · February 27, 2019, 7:19am

You should use Maven as a dependency management tool in your project; then adding a new Add-on is as easy as adding the <dependency> block from Directory to your pom.xml.

JavaVaadin · February 27, 2019, 7:21am

Olli Tietäväinen:
You should use Maven as a dependency management tool in your project; then adding a new Add-on is as easy as adding the <dependency> block from Directory to your pom.xml.

okay, thanks you so much.

And can you help me with question too, please?

https://vaadin.com/forum/thread/17535336/scrollintoview-in-vaadin-10

JavaVaadin · February 27, 2019, 11:40am

Olli Tietäväinen:
You should use Maven as a dependency management tool in your project; then adding a new Add-on is as easy as adding the <dependency> block from Directory to your pom.xml.

I got an error on browser page:

There was an exception while trying to navigate to '' with the exception message 'Unable to create an instance of 'com.vaadin10.MainView'. The constructor threw an exception.'
java.lang.IllegalArgumentException: Unable to create an instance of 'com.vaadin10.MainView'. The constructor threw an exception.
	at com.vaadin.flow.internal.ReflectTools.createProxyInstance(ReflectTools.java:510)
	at com.vaadin.flow.internal.ReflectTools.createInstance(ReflectTools.java:447)
	at com.vaadin.flow.di.DefaultInstantiator.getOrCreate(DefaultInstantiator.java:65)
	at com.vaadin.flow.di.Instantiator.createRouteTarget(Instantiator.java:158)
	at com.vaadin.flow.router.internal.AbstractNavigationStateRenderer.lambda$getRouteTarget$1(AbstractNavigationStateRenderer.java:116)
	at java.util.Optional.orElseGet(Optional.java:267)
	at com.vaadin.flow.router.internal.AbstractNavigationStateRenderer.getRouteTarget(AbstractNavigationStateRenderer.java:115)
	at com.vaadin.flow.router.internal.AbstractNavigationStateRenderer.handle(AbstractNavigationStateRenderer.java:167)
	at com.vaadin.flow.router.Router.handleNavigation(Router.java:202)
	at com.vaadin.flow.router.Router.navigate(Router.java:173)
	at com.vaadin.flow.router.Router.initializeUI(Router.java:94)
	at com.vaadin.flow.server.BootstrapHandler.createAndInitUI(BootstrapHandler.java:1051)
	at com.vaadin.flow.server.BootstrapHandler.synchronizedHandleRequest(BootstrapHandler.java:393)
	at com.vaadin.flow.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:40)
	at com.vaadin.flow.server.VaadinService.handleRequest(VaadinService.java:1498)
	at com.vaadin.flow.server.VaadinServlet.service(VaadinServlet.java:300)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
	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.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:200)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:668)
	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:408)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:834)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1415)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at com.vaadin.flow.internal.ReflectTools.createProxyInstance(ReflectTools.java:479)
	... 38 more
Caused by: java.lang.NoClassDefFoundError: org/vaadin/stefan/dnd/drag/DragSourceExtension
	at com.vaadin10.MainView.<init>(MainView.java:36)
	... 43 more
Caused by: java.lang.ClassNotFoundException: org.vaadin.stefan.dnd.drag.DragSourceExtension
	at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1363)
	at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1186)
	... 44 more

JavaVaadin · March 3, 2019, 9:44am

JavaVaadin Vaadinjava:

Olli Tietäväinen:
You should use Maven as a dependency management tool in your project; then adding a new Add-on is as easy as adding the <dependency> block from Directory to your pom.xml.

I got an error on browser page:

There was an exception while trying to navigate to ‘’ with the exception message ‘Unable to create an instance of ‘com.vaadin10.MainView’. The constructor threw an exception.’
java.lang.IllegalArgumentException: Unable to create an instance of ‘com.vaadin10.MainView’. The constructor threw an exception.
at com.vaadin.flow.internal.ReflectTools.createProxyInstance(ReflectTools.java:510)
at com.vaadin.flow.internal.ReflectTools.createInstance(ReflectTools.java:447)
at com.vaadin.flow.di.DefaultInstantiator.getOrCreate(DefaultInstantiator.java:65)
at com.vaadin.flow.di.Instantiator.createRouteTarget(Instantiator.java:158)
at com.vaadin.flow.router.internal.AbstractNavigationStateRenderer.lambda$getRouteTarget$1(AbstractNavigationStateRenderer.java:116)
at java.util.Optional.orElseGet(Optional.java:267)
at com.vaadin.flow.router.internal.AbstractNavigationStateRenderer.getRouteTarget(AbstractNavigationStateRenderer.java:115)
at com.vaadin.flow.router.internal.AbstractNavigationStateRenderer.handle(AbstractNavigationStateRenderer.java:167)
at com.vaadin.flow.router.Router.handleNavigation(Router.java:202)
at com.vaadin.flow.router.Router.navigate(Router.java:173)
at com.vaadin.flow.router.Router.initializeUI(Router.java:94)
at com.vaadin.flow.server.BootstrapHandler.createAndInitUI(BootstrapHandler.java:1051)
at com.vaadin.flow.server.BootstrapHandler.synchronizedHandleRequest(BootstrapHandler.java:393)
at com.vaadin.flow.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:40)
at com.vaadin.flow.server.VaadinService.handleRequest(VaadinService.java:1498)
at com.vaadin.flow.server.VaadinServlet.service(VaadinServlet.java:300)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
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.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:200)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:490)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:668)
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:408)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:834)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1415)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.vaadin.flow.internal.ReflectTools.createProxyInstance(ReflectTools.java:479)
… 38 more
Caused by: java.lang.NoClassDefFoundError: org/vaadin/stefan/dnd/drag/DragSourceExtension
at com.vaadin10.MainView.(MainView.java:36)
… 43 more
Caused by: java.lang.ClassNotFoundException: org.vaadin.stefan.dnd.drag.DragSourceExtension
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1363)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1186)
… 44 more

in such errors we just need to clear and build our project then run the project again