Getting Started with Vaadin Spring and Spring Boot!

Hi,

I'm trying Vaadin with Spring Boot, and created a project using http://start.spring.io, and followed the steps depicted there!

After loading it into IntelliJ 15.0.3 and running it I get the following error:

....
    at org.springframework.boot.SpringApplication.createAndRefreshContext(SpringApplication.java:361) [spring-boot-1.3.3.RELEASE.jar:1.3.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:307) [spring-boot-1.3.3.RELEASE.jar:1.3.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1191) [spring-boot-1.3.3.RELEASE.jar:1.3.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1180) [spring-boot-1.3.3.RELEASE.jar:1.3.3.RELEASE]
    at com.example.DemoApplication.main(DemoApplication.java:10) [classes/:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.7.0_95]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[na:1.7.0_95]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.7.0_95]
    at java.lang.reflect.Method.invoke(Method.java:606) ~[na:1.7.0_95]
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144) [idea_rt.jar:na]
Caused by: java.lang.IllegalArgumentException: @ConditionalOnMissingBean annotations must specify at least one bean (type, name or annotation)
    at org.springframework.util.Assert.isTrue(Assert.java:68) ~[spring-core-4.2.5.RELEASE.jar:4.2.5.RELEASE]

....

Anybody any idea why this error occurs, and how to tackle it!

Regards,
Gerard

Hi,

Are you able to attach the project here?

Thanks for the files, but... any chance that you can attach the whole project (as a ZIP file) so that I can compile it and run it?

Hi, thanks for the file.

Try removing the spring-boot-starter-tomcat dependency from your pom.xml. You can also remove the ServletInitializer class.

Hi,

Did remove the dependency and th ServletInitializer class; but still the same error!

Regards,
Gerard

It worked for me. Did you run mvn clean install?

Hi,

Yes this works but also when the dependency, and the ServletInitializer class are there!

But when I use the Run 'demo' from the menubar of IntelliJ IDEA 15.0.4 I get the error complaining about a missing bean!

Regards,
Gerard

Hi, it works for me when using Run 'demo'. If I keep the spring-boot-starter-tomcat dependency, then I get the error. So, I would suggest to remove that dependency, run mvn clean install, and then, Run 'demo'.

Hi Alejandro,

I still have the ServletInitializer class, and removed the dependency!
Now it works, but I don't understand what is going on! Could you explain this to me?

Regards,
Gerard

It's actually quite simple.

The spring-boot-starter-tomcat dependency is included by default when you inherit spring-boot-starter-parent.

The pom.xml you attached, explicitly included the spring-boot-starter-tomcat dependency with a slight difference: You specified the provided scope. This scope means that the dependency is to be provided by the JDK or server. So, you can compile of course, but you will run into errors when starting the application as this dependency won't be in the classpath at run time.

Moreover, your application should also run if you keep the spring-boot-starter-tomcat dependency but remove the <scope>provided</scope> part.

Hope that helps clarifying.

Hi Alejandro,

Thanks for your clear answer!

I think I have to dig a bit deeper into spring-boot to be able to better understand what is going on behind the scenes, enabling me to use it more effectively in combination with Vaadin.

Any suggestions are very much welcomed!

Thanks for all your help!

Regards,
Gerard