Spring boot + Vaadin compile themes

Hi All,
I use vaadin 8.0.6 + Spring boot 1.5.4.
Project generated from http://start.spring.io/. There is only one plugin in the build section:

org.springframework.boot spring-boot-maven-plugin

How can I compile themes? I found some articles about it for example;

  1. org.codehaus.mojo/exec-maven-plugin said an error: Plugin execution not covered by lifecycle configuration: org.codehaus.mojo:exec-maven-plugin:1.2.1:java (execution: default, phase: generate-sources)
  2. com.vaadin/vaadin-maven-plugin said an error too:
    Plugin execution not covered by lifecycle configuration: com.vaadin:vaadin-maven-plugin:7.6.0.alpha2:compile-theme (execution: default, phase: generate-
    resources)
  • Plugin execution not covered by lifecycle configuration: com.vaadin:vaadin-maven-plugin:7.6.0.alpha2:update-widgetset (execution: default, phase: process-
    classes)
  • Plugin execution not covered by lifecycle configuration: com.vaadin:vaadin-maven-plugin:7.6.0.alpha2:update-theme (execution: default, phase: generate-sources)
  • Plugin execution not covered by lifecycle configuration: com.vaadin:vaadin-maven-plugin:7.6.0.alpha2:resources (execution: default, phase: process-resources)
  1. When I try to compile directly with sass compiler:
    java -jar vaadin-sass-compiler-0.9.12.jar com.vaadin.sass.SassCompiler styles.scss
    no main manifest attribute, in vaadin-sass-compiler-0.9.12.jar

How can I compile themes?

thx
Zamek

Maybe it was my mistake, because there was a syntax error in my css. That was the reason why the Css compiler could not create the css file.