Gradle 6 with Intellij - refresh fails

Question

I have a gradle 6.0 project with Spring 2.1.7.

When I try to refresh all gradle projects from intellij

I got an error:

Unable to load class 'org.gradle.api.internal.plugins.DefaultConvention'. Possible causes for this unexpected error include:

• Gradle's dependency cache may be corrupt (this sometimes occurs after a network connection timeout.) Re-download dependencies and sync project (requires network)
• The state of a Gradle build process (daemon) may be corrupt. Stopping all Gradle daemons may solve this problem. Stop Gradle build processes (requires restart)
• Your project may be using a third-party plugin which is not compatible with the other plugins in the project or the version of Gradle requested by the project.

In the case of corrupt Gradle processes, you can also try closing the IDE and then killing all Java processes.

I use intellij v 2018.3.4 and I've configured it to use the gradle wrapper:

The gradle-wrapper.properties looks like this:

distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-6.0-bin.zip
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists

If I run the gradle wrapper from command line there are not problems. Also If I trigger a gradle task (build, clean ...) from Intellij I have no errors.

I have another wired issue that could be related to this one. In my build.gradle I use spring boot 2.1.7 and If I run my jar from the command line I can see from the Spring Boot banner the configured version 2.1.7. Instead If I run the application form Intellij I see that It is using Spring Boot 2.0.8, also if I expand the External libraries tree I see:

the build.gradle looks like:

buildscript {
 ext {
   springBootVersion = "2.1.7.RELEASE"
   springBootDepManagementVersion = "1.0.8.RELEASE"
 }
}
plugins {
 id 'idea'
 id 'java'
 id "io.spring.dependency-management" version "${springBootDepManagementVersion}"
 id 'org.springframework.boot' version "${springBootVersion}"
}
dependencies {
   implementation 'org.springframework.boot:spring-boot-starter-web'
   ....
}

Thank you

Answer 1

I solved the problem downgrading the gradle wrapper to 5.6.4. Apparently my Intellij version does not support gradle 6.0.0

Answer 2

Downgrading also do the job for me:

gradlew wrapper --gradle-version 5.6.4