Vaadin 8.1.0 TreeGrid ClassNotFoundException

Vaadin 6 / 7 / 8
1

Hello all,

I recently updated to Vaadin 8.1.0. and added a TreeGrid to one of my views (instantiating it by hand, the designer version 2.2.3 does not show the TreeGrid). When I try to navigate to the view, I get a ClassNotFoundException for com.vaadin.ui.TreeGrid.

I’m using Spring-Boot and Maven. The dependency is com.vaadin.vaadin.bom, version 8.1.0, in the “effective POM” view I see vaadin-server version 8.1.0.
I recompiled the widgetset, updated the project, did a clean install, but still get the exception.

Then I tried adding Vaadin Server a second time, directly to the dependencies. Now the TreeGrid shows, but the console warns me that the Vaadin version does not correspond to the widgetset version (8.0-SNAPSHOT). Recompile/deploy as suggested in the warning did not work.

So, how do I correctly define the dependencies? Should the BOM not work on it’s own? What to do about the widgetset warning?

Cheers,
Stefan

2

Hi,

Sounds like you have some dependency which includes an 8.0-SNAPSHOT version.
If you do mvn dependency:tree or some similar command in the IDE, you should see where it comes from

3

Hi Artur,

thanks for your reply! I checked the dependency hierarchy in Eclipse and only found “8.1.0 (managed from 8.0-SNAPSHOT)” in vaadin-spring-boot-starter and vaadin-spring-ext-boot - there seems to be no active dependency on 8.0-SNAPSHOT.
In the maven dependecy tree (via command line), there is no mention of the snapshot at all.
Here is the relevant section of the tree:

[INFO] +- com.vaadin:vaadin-spring-boot-starter:jar:2.0.1:compile [INFO] | +- com.vaadin:vaadin-spring-boot:jar:2.0.1:compile [INFO] | | +- org.springframework.boot:spring-boot:jar:1.5.6.RELEASE:compile [INFO] | | +- org.springframework.boot:spring-boot-autoconfigure:jar:1.5.6.RELEASE:compile [INFO] | | \- org.springframework:spring-webmvc:jar:4.3.10.RELEASE:compile [INFO] | +- org.springframework.boot:spring-boot-starter-web:jar:1.5.6.RELEASE:compile [INFO] | | +- org.springframework.boot:spring-boot-starter:jar:1.5.6.RELEASE:compile [INFO] | | | +- org.springframework.boot:spring-boot-starter-logging:jar:1.5.6.RELEASE:compile [INFO] | | | | +- ch.qos.logback:logback-classic:jar:1.1.11:compile [INFO] | | | | | \- ch.qos.logback:logback-core:jar:1.1.11:compile [INFO] | | | | +- org.slf4j:jul-to-slf4j:jar:1.7.25:compile [INFO] | | | | \- org.slf4j:log4j-over-slf4j:jar:1.7.25:compile [INFO] | | | \- org.yaml:snakeyaml:jar:1.17:runtime [INFO] | | +- org.springframework.boot:spring-boot-starter-tomcat:jar:1.5.6.RELEASE:compile [INFO] | | | +- org.apache.tomcat.embed:tomcat-embed-core:jar:8.5.16:compile [INFO] | | | +- org.apache.tomcat.embed:tomcat-embed-el:jar:8.5.16:compile [INFO] | | | \- org.apache.tomcat.embed:tomcat-embed-websocket:jar:8.5.16:compile [INFO] | | +- org.hibernate:hibernate-validator:jar:5.3.5.Final:compile [INFO] | | | +- javax.validation:validation-api:jar:1.1.0.Final:compile [INFO] | | | +- org.jboss.logging:jboss-logging:jar:3.3.1.Final:compile [INFO] | | | \- com.fasterxml:classmate:jar:1.3.3:compile [INFO] | | \- org.springframework:spring-web:jar:4.3.10.RELEASE:compile [INFO] | +- com.vaadin:vaadin-themes:jar:8.1.0:compile [INFO] | \- com.vaadin:vaadin-client-compiled:jar:8.1.0:compile [INFO] +- com.vaadin:vaadin-push:jar:8.1.0:compile [INFO] | \- com.vaadin.external.atmosphere:atmosphere-runtime:jar:2.4.11.vaadin1:compile [INFO] | \- com.vaadin.external.slf4j:vaadin-slf4j-jdk14:jar:1.6.1:compile [INFO] +- org.vaadin.spring.extensions:vaadin-spring-ext-boot:jar:2.0.0.RELEASE:compile [INFO] | \- com.vaadin:vaadin-spring:jar:2.0.1:compile [INFO] +- org.vaadin.spring.addons:vaadin-spring-addon-simple-mvp:jar:2.0.0.RELEASE:compile [INFO] | \- org.vaadin.spring.addons:vaadin-spring-addon-eventbus:jar:2.0.0.RELEASE:compile [INFO] | \- org.vaadin.spring.extensions:vaadin-spring-ext-core:jar:2.0.0.RELEASE:compile [INFO] +- org.vaadin.addon:confirmdialog:jar:3.1.1:compile [INFO] +- org.projectlombok:lombok:jar:1.16.18:provided [INFO] \- com.vaadin:vaadin-server:jar:8.1.0:compile [INFO] +- com.vaadin:vaadin-sass-compiler:jar:0.9.13:compile [INFO] | +- org.w3c.css:sac:jar:1.3:compile [INFO] | \- com.vaadin.external.flute:flute:jar:1.3.0.gg2:compile [INFO] +- com.vaadin:vaadin-shared:jar:8.1.0:compile [INFO] +- org.jsoup:jsoup:jar:1.8.3:compile [INFO] \- com.vaadin.external:gentyref:jar:1.2.0.vaadin1:compile Do you see any other possible causes?

4

Found the problem:
The app is launched via another project with a dependency on the above one, but without a vaadin-dependecy of it’s own. Seems that the managed dependecies on vaadin 8.1.0 don’t survive this relationship: The launcher-project gets the 8.0-SNAPSHOT entries via vaadin-spring-boot-starter and vaadin-spring-ext-boot, ignoring the management.

So now I added the 8.1.0 versions to the launcher, and it works.