Open SubWindow with a link

hans-georg1 · June 16, 2018, 1:21pm

i am using Vaadin 8

I have a SubWindow-Class

@ViewScoped
public class AboutSubView extends Window {
	   public static final String VIEW_NAME = "About";

	    public AboutSubView() {
	        VerticalLayout subContent = new VerticalLayout();
			this.setContent(subContent);
			this.center();
			
			TextArea txaMessage = new TextArea();
			
			subContent.addComponent(txaMessage);
			getUI().addWindow(this);
	    }
}

How can i open via CDI the AboutSubView as a Sub-Window via Link from my View HelpView

@UIScoped
public class HelpView extends VerticalLayout implements View {

	@PostConstruct
	void init() {
		addComponent(getAbout());
	}
	
	private Link getAbout() {
		AboutSubView aboutView = new AboutSubView();
    	Link link = new Link();
		... 
    	return link;
    }

mcollovati · June 16, 2018, 3:19pm

Hi,
you cannot add the window inside AboutSubView constructor because getUI() will return null until the window is attached.

You can use a Button instead of a Link and do something like this

Button btn = new Button("About", ev -> getUI().addWindow(new AboutSubView()));

If you are using Valo theme (or your custom theme is based on Valo) you can make the button appear like a link with the appropriate css class

btn.setStyleName(ValoTheme.BUTTON_LINK);

And if AboutSubView has dependencies consider to inject it into HelpView instead of using the new operator

HTH
Marco

hans-georg1 · June 18, 2018, 5:43am

Thanks for your answer, but I still get an error.

My code is now:

@ViewScoped
public class AboutSubView extends Window {
	   public static final String VIEW_NAME = "About";

	    public AboutSubView() {
	        VerticalLayout subContent = new VerticalLayout();
			this.setContent(subContent);
			this.center();
			
			TextArea txaMessage = new TextArea();
			
			subContent.addComponent(txaMessage);
			getUI().addWindow(this);
	    }
}

@CDIView(Constants.HELP_VIEW)
@UIScoped
public class HelpView extends VerticalLayout implements View {
	@Inject
	AboutSubView aboutView;

	@PostConstruct
	void init() {
		Button about = new Button("About", ev -> getUI().addWindow(aboutView));
		about.addStyleName("link");
		addComponent(about);
	}

The error is:

07:41:00,823 SEVERE [com.vaadin.server.DefaultErrorHandler]
 (default task-2) : java.lang.NullPointerException
	at org.app.view.help.AboutSubView.<init>(AboutSubView.java:21)
	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 org.jboss.weld.injection.ConstructorInjectionPoint.newInstance(ConstructorInjectionPoint.java:119)
	at org.jboss.weld.injection.ConstructorInjectionPoint.invokeAroundConstructCallbacks(ConstructorInjectionPoint.java:92)
	at org.jboss.weld.injection.ConstructorInjectionPoint.newInstance(ConstructorInjectionPoint.java:78)
	at org.jboss.weld.injection.producer.AbstractInstantiator.newInstance(AbstractInstantiator.java:28)
	at org.jboss.weld.injection.producer.BasicInjectionTarget.produce(BasicInjectionTarget.java:112)
	at org.jboss.weld.injection.producer.BeanInjectionTarget.produce(BeanInjectionTarget.java:186)
	at org.jboss.weld.bean.ManagedBean.create(ManagedBean.java:158)
	at org.apache.deltaspike.core.util.context.ContextualStorage.createContextualInstance(ContextualStorage.java:131)
	at org.apache.deltaspike.core.util.context.AbstractContext.get(AbstractContext.java:129)
	at com.vaadin.cdi.internal.ContextWrapper.get(ContextWrapper.java:51)
	at org.jboss.weld.bean.ContextualInstanceStrategy$DefaultContextualInstanceStrategy.get(ContextualInstanceStrategy.java:100)
	at org.jboss.weld.bean.ContextualInstance.get(ContextualInstance.java:50)
	at org.jboss.weld.manager.BeanManagerImpl.getReference(BeanManagerImpl.java:689)
	at org.jboss.weld.manager.BeanManagerImpl.getInjectableReference(BeanManagerImpl.java:789)
	at org.jboss.weld.injection.FieldInjectionPoint.inject(FieldInjectionPoint.java:92)
	at org.jboss.weld.util.Beans.injectBoundFields(Beans.java:335)
	at org.jboss.weld.util.Beans.injectFieldsAndInitializers(Beans.java:346)
	at org.jboss.weld.injection.producer.ResourceInjector$1.proceed(ResourceInjector.java:69)
	at org.jboss.weld.injection.InjectionContextImpl.run(InjectionContextImpl.java:48)
	at org.jboss.weld.injection.producer.ResourceInjector.inject(ResourceInjector.java:71)
	at org.jboss.weld.injection.producer.BasicInjectionTarget.inject(BasicInjectionTarget.java:117)
	at org.jboss.weld.bean.ManagedBean.create(ManagedBean.java:159)
	at org.apache.deltaspike.core.util.context.ContextualStorage.createContextualInstance(ContextualStorage.java:131)
	at org.apache.deltaspike.core.util.context.AbstractContext.get(AbstractContext.java:129)
	at com.vaadin.cdi.internal.ContextWrapper.get(ContextWrapper.java:51)
	at org.jboss.weld.bean.ContextualInstanceStrategy$DefaultContextualInstanceStrategy.get(ContextualInstanceStrategy.java:100)
	at org.jboss.weld.bean.ContextualInstance.get(ContextualInstance.java:50)
	at org.jboss.weld.manager.BeanManagerImpl.getReference(BeanManagerImpl.java:689)
	at org.jboss.weld.manager.BeanManagerImpl.getReference(BeanManagerImpl.java:712)
	at org.jboss.weld.util.ForwardingBeanManager.getReference(ForwardingBeanManager.java:64)
	at org.jboss.weld.bean.builtin.BeanManagerProxy.getReference(BeanManagerProxy.java:86)
	at org.apache.deltaspike.core.api.provider.BeanProvider.getContextualReference(BeanProvider.java:497)
	at org.apache.deltaspike.core.api.provider.BeanProvider.getContextualReference(BeanProvider.java:274)
	at org.apache.deltaspike.core.api.provider.BeanProvider.getContextualReference(BeanProvider.java:268)
	at com.vaadin.cdi.internal.ViewContextualStorageManager.prepareChange(ViewContextualStorageManager.java:71)
	at com.vaadin.cdi.internal.ViewContextualStorageManager$Proxy$_$$_WeldClientProxy.prepareChange(Unknown Source)
	at com.vaadin.cdi.CDIViewProvider.getView(CDIViewProvider.java:226)
	at com.vaadin.navigator.Navigator.navigateTo(Navigator.java:652)
	at org.app.view.TopMainMenu.lambda$new$d9aec940$1(TopMainMenu.java:52)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:499)
	at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:273)
	at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:237)
	at com.vaadin.server.AbstractClientConnector.fireEvent(AbstractClientConnector.java:1014)
	at com.vaadin.ui.Button.fireClick(Button.java:384)
	at com.vaadin.ui.Button$1.click(Button.java:57)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:155)
	at com.vaadin.server.ServerRpcManager.applyInvocation(ServerRpcManager.java:116)
	at com.vaadin.server.communication.ServerRpcHandler.handleInvocation(ServerRpcHandler.java:445)
	at com.vaadin.server.communication.ServerRpcHandler.handleInvocations(ServerRpcHandler.java:410)
	at com.vaadin.server.communication.ServerRpcHandler.handleRpc(ServerRpcHandler.java:274)
	at com.vaadin.server.communication.UidlRequestHandler.synchronizedHandleRequest(UidlRequestHandler.java:90)
	at com.vaadin.server.SynchronizedRequestHandler.handleRequest(SynchronizedRequestHandler.java:40)
	at com.vaadin.server.VaadinService.handleRequest(VaadinService.java:1601)
	at com.vaadin.server.VaadinServlet.service(VaadinServlet.java:445)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
	at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:74)
	at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
	at io.undertow.servlet.handlers.ServletChain$1.handleRequest(ServletChain.java:67)
	at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
	at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78)
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
	at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131)
	at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
	at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
	at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
	at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)
	at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)
	at io.undertow.security.handlers.NotificationReceiverHandler.handleRequest(NotificationReceiverHandler.java:50)
	at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
	at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61)
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
	at org.wildfly.extension.undertow.deployment.GlobalRequestControllerHandler.handleRequest(GlobalRequestControllerHandler.java:68)
	at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
	at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:292)
	at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:81)
	at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:138)
	at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:135)
	at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48)
	at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)
	at org.wildfly.extension.undertow.security.SecurityContextThreadSetupAction.lambda$create$0(SecurityContextThreadSetupAction.java:105)
	at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1526)
	at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1526)
	at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1526)
	at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1526)
	at org.wildfly.extension.undertow.deployment.UndertowDeploymentInfoService$UndertowThreadSetupAction.lambda$create$0(UndertowDeploymentInfoService.java:1526)
	at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:272)
	at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:81)
	at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:104)
	at io.undertow.server.Connectors.executeRootHandler(Connectors.java:360)
	at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:830)
	at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
	at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1985)
	at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1487)
	at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1378)
	at java.lang.Thread.run(Thread.java:745)

mcollovati · June 18, 2018, 6:04am

Hi,
as said above you cannot add the window inside AboutSubView constructor because getUI() will return null.

Try to remove getUI().addWindow(this) from AboutSubView constructor.

HTH
Marco

hans-georg1 · June 18, 2018, 7:03am

Hi Marco
Thanks, now it works

hans-georg1 · June 18, 2018, 9:57am

One more question to Vaadin CDI

how can i call a Constructur with parameter?

Example:

@CDIView(Constants.TITLE_VIEW)
public class TitleView extends VerticalLayout implements View {

	@Inject
	TitleDetailView titleDetailView(...) ;
	
	Title selectedTitle = new Title();
	Button detailView = new Button("detailView", ev -> getUI().addWindow(titleDetailView(selectedTitle)));
	...
}

@ViewScoped
public class TitleDetailView extends Window {
	public TitleDetailView(Title selectedTitle) {
	...
	}
}

My problem is that i want to inject TitleDetailView with a Parameter?

Have you any suggestion how to solve it?

Tatu2 · June 18, 2018, 2:12pm

how can i call a Constructur with parameter?

Things start to get more complex when you add parameters into play with CDI. You probably need to use Producer see here:

http://buraktas.com/cdi-dependency-injection-producer-method-example/

hans-georg1 · June 18, 2018, 2:51pm

Thanks for the answer.
The website is very good