您需要在pom.xml中添加以下目标，该目标会将.scss文件编译为.css文件：
<plugin> <groupId>org.prehaus.mojo</groupId> <artifactId>exec-maven-plugin</artifactId> <version>1.2.1</version> <executions> <execution> <phase>generate-sources</phase> <goals> <goal>java</goal> </goals> <configuration> <classpathScope>compile</classpathScope> <mainClass>com.vaadin.sass.SassCompiler</mainClass> <arguments> <argument>src/main/webapp/VAADIN/themes/heijunka/styles.scss</argument> <argument>src/main/webapp/VAADIN/themes/heijunka/styles.css</argument> </arguments> </configuration> </execution> </executions></plugin>
资料来源：http :
//dev.vaadin.com/ticket/10291
