Can't use Push with Spring Boot because there is no web.xml?

Vaadin 6 / 7 / 8
1

So the Push feature requires adding to the web.xml. Spring Boot doesn’t use a web.xml file so how can you use Push when you are using Spring Boot?

2

Hi Brian,

It requires vaadin-push as a dependency and then you can activate it adding @Push annotation to the UI. Should work out of the box. If it doesn’t, then we’ll need more details about the issues.

//Teemu

3

Thanks Teemu,

I took your suggestion and now I am getting the following:

Atmosphere could not be loaded. When using push with Vaadin, the
Atmosphere framework must be present on the classpath.
If using a dependency management system, please add a dependency
to vaadin-push.
If managing dependencies manually, please make sure Atmosphere
2.2.7.vaadin1 is included on the classpath.
Will fall back to using PushMode.DISABLED.

Looking at Maven Central there are a lot of different Atmosphere jars. Is there some information somewhere that will tell me which ones I need?

4

Hi Brian, please look in your deployment WEB-INF/lib/ folder and ensure you have these jars:

atmosphere-runtime-2.2.7.vaadin1.jar
vaadin-push-7.5.8.jar
5

Thanks cboyd.

I added the following and verified that those two jars are in the build but I am still getting the same error. Any other ideas?

com.vaadin.external.atmosphere atmosphere-runtime 2.2.7.vaadin1
6

I can’t get this to work. Still getting:

Atmosphere could not be loaded. When using push with Vaadin, the
Atmosphere framework must be present on the classpath.
If using a dependency management system, please add a dependency
to vaadin-push.
If managing dependencies manually, please make sure Atmosphere
2.2.7.vaadin1 is included on the classpath.
Will fall back to using PushMode.DISABLED.

What other details do you need?

7

Which versions are you using?

What I just did to test it:

  • get a Spring Boot project from Spring Initializr with the “get zip” link on
    https://vaadin.com/spring
  • add a UI class in the project:
@SpringUI public static class VaadinUI extends UI {
    protected void init(VaadinRequest request) {
         setContent(new Label("Hello!"));
    }
}
  • add a dependency in pom.xml:
<dependency>
    <groupId>com.vaadin</groupId>
    <artifactId>vaadin-push</artifactId>
</dependency>

Push is initialized correctly and there are no errors/warnings in the logs.

8

Hello Henri,

Don’t you have to use the @Push annotation on your class to enable push?

9

Hi,

It was used when we tested it. He must’ve forgotten to add it to the copy pasted UI. I verified it as well and seemed to be working.

//Teemu

10

Thank you for verifying this works with boot. It verified for me that something was wrong on my end. Somehow my local maven repo got corrupted. I wiped it out and started fresh and now push is working.

11

I also use spring-boot to make vaadin-spring projects. I have a problem with my session scoped beans and vaadin-push. Spring throws an exception telling me that I cannot use session beans from the separate thread. The problem had been discussed here
https://vaadin.com/forum#!/thread/3536891
 too. So which is the proper way for me to fix that?