GridDropEvent throws Exception when dropping Row on Header

### Description of the bug

When I drag rows of a Grid on a additional header containing a Textfield I get the following Exception:

```java
2025-07-16T10:34:41.585+02:00 ERROR 16240 --- [nio-8080-exec-9] c.v.flow.server.DefaultErrorHandler      : 

java.lang.IllegalArgumentException: Unable to create an event object of type com.vaadin.flow.component.grid.dnd.GridDropEvent
	at com.vaadin.flow.component.ComponentEventBus.createEventForDomEvent(ComponentEventBus.java:543) ~[flow-server-24.8.3.jar:24.8.3]
	at com.vaadin.flow.component.ComponentEventBus.handleDomEvent(ComponentEventBus.java:500) ~[flow-server-24.8.3.jar:24.8.3]
	at com.vaadin.flow.component.ComponentEventBus.lambda$addDomTrigger$dd1b7957$1(ComponentEventBus.java:303) ~[flow-server-24.8.3.jar:24.8.3]
	at com.vaadin.flow.internal.nodefeature.ElementListenerMap.lambda$fireEvent$2(ElementListenerMap.java:475) ~[flow-server-24.8.3.jar:24.8.3]
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1596) ~[na:na]
	at com.vaadin.flow.internal.nodefeature.ElementListenerMap.fireEvent(ElementListenerMap.java:475) ~[flow-server-24.8.3.jar:24.8.3]
	at com.vaadin.flow.server.communication.rpc.EventRpcHandler.handleNode(EventRpcHandler.java:62) ~[flow-server-24.8.3.jar:24.8.3]
	at com.vaadin.flow.server.communication.rpc.AbstractRpcInvocationHandler.handle(AbstractRpcInvocationHandler.java:79) ~[flow-server-24.8.3.jar:24.8.3]
	at com.vaadin.flow.server.communication.ServerRpcHandler.handleInvocationData(ServerRpcHandler.java:568) ~[flow-server-24.8.3.jar:24.8.3]
	at com.vaadin.flow.server.communication.ServerRpcHandler.lambda$handleInvocations$6(ServerRpcHandler.java:549) ~[flow-server-24.8.3.jar:24.8.3]
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1596) ~[na:na]
	at com.vaadin.flow.server.communication.ServerRpcHandler.handleInvocations(ServerRpcHandler.java:549) ~[flow-server-24.8.3.jar:24.8.3]
	at com.vaadin.flow.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:376) ~[flow-server-24.8.3.jar:24.8.3]
	at com.vaadin.flow.server.communication.UidlRequestHandler.synchronizedHandleRequest(UidlRequestHandler.java:136) ~[flow-server-24.8.3.jar:24.8.3]
	at com.vaadin.flow.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:63) ~[flow-server-24.8.3.jar:24.8.3]
	at com.vaadin.flow.server.VaadinService.handleRequest(VaadinService.java:1853) ~[flow-server-24.8.3.jar:24.8.3]
	at com.vaadin.flow.server.VaadinServlet.service(VaadinServlet.java:398) ~[flow-server-24.8.3.jar:24.8.3]
	at com.vaadin.flow.spring.SpringServlet.service(SpringServlet.java:106) ~[vaadin-spring-24.8.3.jar:na]
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658) ~[tomcat-embed-core-10.1.41.jar:6.0]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:195) ~[tomcat-embed-core-10.1.41.jar:10.1.41]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) ~[tomcat-embed-core-10.1.41.jar:10.1.41]
	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:612) ~[tomcat-embed-core-10.1.41.jar:10.1.41]
	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:394) ~[tomcat-embed-core-10.1.41.jar:10.1.41]
	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:323) ~[tomcat-embed-core-10.1.41.jar:10.1.41]
	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:268) ~[tomcat-embed-core-10.1.41.jar:10.1.41]
	at org.springframework.web.servlet.mvc.ServletForwardingController.handleRequestInternal(ServletForwardingController.java:142) ~[spring-webmvc-6.2.7.jar:6.2.7]
	at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:178) ~[spring-webmvc-6.2.7.jar:6.2.7]
	at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:51) ~[spring-webmvc-6.2.7.jar:6.2.7]
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1089) ~[spring-webmvc-6.2.7.jar:6.2.7]
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:979) ~[spring-webmvc-6.2.7.jar:6.2.7]
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014) ~[spring-webmvc-6.2.7.jar:6.2.7]
	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:914) ~[spring-webmvc-6.2.7.jar:6.2.7]
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:590) ~[tomcat-embed-core-10.1.41.jar:6.0]
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:885) ~[spring-webmvc-6.2.7.jar:6.2.7]
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658) ~[tomcat-embed-core-10.1.41.jar:6.0]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:195) ~[tomcat-embed-core-10.1.41.jar:10.1.41]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) ~[tomcat-embed-core-10.1.41.jar:10.1.41]
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) ~[tomcat-embed-websocket-10.1.41.jar:10.1.41]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) ~[tomcat-embed-core-10.1.41.jar:10.1.41]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) ~[tomcat-embed-core-10.1.41.jar:10.1.41]
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-6.2.7.jar:6.2.7]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.2.7.jar:6.2.7]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) ~[tomcat-embed-core-10.1.41.jar:10.1.41]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) ~[tomcat-embed-core-10.1.41.jar:10.1.41]
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-6.2.7.jar:6.2.7]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.2.7.jar:6.2.7]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) ~[tomcat-embed-core-10.1.41.jar:10.1.41]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) ~[tomcat-embed-core-10.1.41.jar:10.1.41]
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-6.2.7.jar:6.2.7]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.2.7.jar:6.2.7]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) ~[tomcat-embed-core-10.1.41.jar:10.1.41]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) ~[tomcat-embed-core-10.1.41.jar:10.1.41]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167) ~[tomcat-embed-core-10.1.41.jar:10.1.41]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) ~[tomcat-embed-core-10.1.41.jar:10.1.41]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:483) ~[tomcat-embed-core-10.1.41.jar:10.1.41]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:116) ~[tomcat-embed-core-10.1.41.jar:10.1.41]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) ~[tomcat-embed-core-10.1.41.jar:10.1.41]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-10.1.41.jar:10.1.41]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344) ~[tomcat-embed-core-10.1.41.jar:10.1.41]
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:398) ~[tomcat-embed-core-10.1.41.jar:10.1.41]
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) ~[tomcat-embed-core-10.1.41.jar:10.1.41]
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:903) ~[tomcat-embed-core-10.1.41.jar:10.1.41]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1740) ~[tomcat-embed-core-10.1.41.jar:10.1.41]
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) ~[tomcat-embed-core-10.1.41.jar:10.1.41]
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1189) ~[tomcat-embed-core-10.1.41.jar:10.1.41]
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:658) ~[tomcat-embed-core-10.1.41.jar:10.1.41]
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63) ~[tomcat-embed-core-10.1.41.jar:10.1.41]
	at java.base/java.lang.Thread.run(Thread.java:1583) ~[na:na]
Caused by: java.lang.reflect.InvocationTargetException: null
	at java.base/jdk.internal.reflect.DirectConstructorHandleAccessor.newInstance(DirectConstructorHandleAccessor.java:74) ~[na:na]
	at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:502) ~[na:na]
	at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:486) ~[na:na]
	at com.vaadin.flow.component.ComponentEventBus.createEventForDomEvent(ComponentEventBus.java:537) ~[flow-server-24.8.3.jar:24.8.3]
	... 67 common frames omitted
Caused by: java.util.NoSuchElementException: No value present
	at java.base/java.util.Optional.get(Optional.java:143) ~[na:na]
	at com.vaadin.flow.component.grid.dnd.GridDropEvent.<init>(GridDropEvent.java:86) ~[vaadin-grid-flow-24.8.3.jar:na]
	at java.base/jdk.internal.reflect.DirectConstructorHandleAccessor.newInstance(DirectConstructorHandleAccessor.java:62) ~[na:na]
	... 70 common frames omitted
```

Drag'n Drop on the Grid was configured like this:

```java
grid.setRowsDraggable(  true );
grid.setDropMode( GridDropMode.ON_TOP );

// important so GridDropEvent gets created by dragging row over textfield in header
grid.addDropListener( e -> {} );
```

Columns/Header are configured like this:

```java
HeaderRow headerRow = grid.appendHeaderRow();
headerRow.getCell( name ).setComponent(  new TextField() );
```

### Expected behavior

There shouldn't be an exception when dragging Rows on the header.

Simple fix could be to change

```java
this.dropLocation = Arrays.asList(GridDropLocation.values()).stream()
       .filter(dl -> dl.getClientName().equals(dropLocation))
       .findFirst().get();
```

to

```java
this.dropLocation = Arrays.asList( GridDropLocation.values()).stream()
	.filter(dl -> dl.getClientName().equals(dropLocation))
	.findFirst()
	.orElse( GridDropLocation.EMPTY );
```

in `com.vaadin.flow.component.grid.dnd.GridDropEvent` (Line 84, Constructor)

### Minimal reproducible example

[dnd-bug.zip](https://github.com/user-attachments/files/21250819/dnd-bug.zip)

1. Start Application
2. Drag any cell of content onto any header-textfield

<img width="2560" height="1269" alt="Image" src="https://github.com/user-attachments/assets/9308c9cb-a7c9-430e-8f21-8fe6896836c6" />

=> Exception thrown see Log

### Versions

- Vaadin / Flow version: 24.8.3
- Java version: 21
- OS version: Windows 11
- Browser version (if applicable): Version 138.0.7204.158 (Offizieller Build) (64-Bit)
- Application Server (if applicable): SpringBoot
- IDE (if applicable): IntelliJ IDEA 2025.1.3 (Ultimate Edition)


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GridDropEvent throws Exception when dropping Row on Header #7689

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GridDropEvent throws Exception when dropping Row on Header #7689

Description

Description of the bug

Expected behavior

Minimal reproducible example

Versions

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

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