The error appears if the engine connection fields are empty and you click “Test connection”.

[rusiaikinat]

Environment

Version: 2026.1.999-SNAPSHOT

Steps To Reproduce

Leave the connection fields empty and click “Test connection”.

bandicam.2026-09-03.15-37-12-818.mp4

Current Behavior

java.lang.NullPointerException: Cannot invoke "String.length()" because "this.input" is null
	at java.base/java.net.URI$Parser.parse(URI.java:3186)
	at java.base/java.net.URI.<init>(URI.java:645)
	at io.flowset.control.util.UrlUtils.isValidUrl(UrlUtils.java:21)
	at io.flowset.control.action.TestEngineConnectionAction.actionPerform(TestEngineConnectionAction.java:96)
	at io.jmix.flowui.kit.component.button.JmixButtonActionSupport.onButtonClick(JmixButtonActionSupport.java:176)
	at com.vaadin.flow.component.ComponentEventBus.fireEventForListener(ComponentEventBus.java:242)
	at com.vaadin.flow.component.ComponentEventBus.handleDomEvent(ComponentEventBus.java:494)
	at com.vaadin.flow.component.ComponentEventBus.lambda$addDomTrigger$dd1b7957$1(ComponentEventBus.java:301)
	at com.vaadin.flow.internal.nodefeature.ElementListenerMap.lambda$fireEvent$2(ElementListenerMap.java:501)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)
	at com.vaadin.flow.internal.nodefeature.ElementListenerMap.fireEvent(ElementListenerMap.java:501)
	at com.vaadin.flow.server.communication.rpc.EventRpcHandler.handleNode(EventRpcHandler.java:62)
	at com.vaadin.flow.server.communication.rpc.AbstractRpcInvocationHandler.handle(AbstractRpcInvocationHandler.java:80)
	at com.vaadin.flow.server.communication.ServerRpcHandler.handleInvocationData(ServerRpcHandler.java:619)
	at com.vaadin.flow.server.communication.ServerRpcHandler.lambda$handleInvocations$6(ServerRpcHandler.java:600)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)
	at com.vaadin.flow.server.communication.ServerRpcHandler.handleInvocations(ServerRpcHandler.java:600)
	at com.vaadin.flow.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:424)
	at com.vaadin.flow.server.communication.UidlRequestHandler.synchronizedHandleRequest(UidlRequestHandler.java:137)
	at com.vaadin.flow.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:63)
	at com.vaadin.flow.server.VaadinService.handleRequest(VaadinService.java:1835)
	at com.vaadin.flow.server.VaadinServlet.service(VaadinServlet.java:402)
	at com.vaadin.flow.spring.SpringServlet.service(SpringServlet.java:106)
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:723)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:128)
	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:513)
	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:333)
	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:262)
	at org.springframework.web.servlet.mvc.ServletForwardingController.handleRequestInternal(ServletForwardingController.java:139)
	at org.springframework.web.servlet.mvc.AbstractController.handleRequest(AbstractController.java:177)
	at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:49)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:866)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1000)
	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:903)
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:653)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:874)
	at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:723)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:128)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107)
	at io.jmix.core.impl.metadata.MetadataGenerationFilter.doFilterInternal(MetadataGenerationFilter.java:45)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:107)
	at io.jmix.core.impl.logging.LogMdcFilter.doFilterInternal(LogMdcFilter.java:44)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116)

Expected Behavior

A description of what you expected to happen.

Additional context (Optional)

Add any other context about the problem here.