error when upgrading Spring Boot version in Vaadin Gradle project - gradle

Question

I have a Gradle project that uses Spring Boot + Vaadin.
The Gradle plugins for Spring Boot and Vaadin configured as follows:
buildscript {
ext {
springBootVersion = '1.3.7.RELEASE'
}
...
dependencies {
classpath "org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}"
classpath "fi.jasoft.plugin:gradle-vaadin-plugin:0.11.1"
}
}
The Vaadin version is specified as follows:
vaadin {
version '7.6.8'
widgetset 'com.vaadin.DefaultWidgetSet'
}
Vaadin dependencies are specified as follows:
dependencies {
compile 'com.vaadin:vaadin-spring-boot-starter:1.0.0'
compile 'com.vaadin:vaadin-server:${vaadin.version}'
compile 'com.vaadin:vaadin-client:${vaadin.version}'
...
}
This works fine, but as soon as I change the Spring Boot version to
springBootVersion = '1.4.0.RELEASE'
then I get the error:
Illegal character in path at index 89:
https://oss.sonatype.org/content/repositories/vaadin-snapshots/com/vaadin/vaadin-server/${vaadin.version}/vaadin-server-${vaadin.version}.pom
Update
Groovy (which Gradle uses) supports String interpolation only when using double quotes (") so changing the Vaadin dependencies to
dependencies {
compile "com.vaadin:vaadin-spring-boot-starter:1.0.0"
compile "com.vaadin:vaadin-server:${vaadin.version}"
compile "com.vaadin:vaadin-client:${vaadin.version}"
...
}
fixes it. Now the real question is why the single quotes work fine if I downgrade Spring Boot to 1.3.7-RELEASE.

Answer 1

If you are using a recent Spring Boot version you should upgrade your Gradle Vaadin plugin. Recent versions of the plugin has much better support for Spring Boot.
Here is a guide to get you started https://github.com/johndevs/gradle-vaadin-plugin/wiki/Creating-a-Spring-Boot-Project