Error with Gradle Build SonarQube Plugin Registering Findbugs Plugin

How to Fix the Error: Unable to register extension org.sonar.plugins.findbugs.FindbugsConfiguration when Running Gradle sonarqube task

Using Gradle, Sonarqube and Findbugs you may get the following error when you try to execute the command:

./gradlew clean build sonarqube

Here is the error:

FAILURE: Build failed with an exception.
* What went wrong:Execution failed for task ':sonarqube'.> Unable to register extension org.sonar.plugins.findbugs.FindbugsConfiguration
* Try:Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
BUILD FAILED

Root Cause

This bug seems to occur when there is a mismatch of versions that don't play nice together.

For instance here are the versions of our stack:

• Sonar Version: 5.3
• SonarQube Gradle Plugin:  2.0.1

Update Findbugs plugin on Sonar:

First, we had to update our Sonar server:

Navigate to the Update Center

Navigate to the Sonar Update Center

Update the findbugs plugin and restart the sonar instance

Update findbugs plugin

Update your Gradle Dependencies:

Update the sonarqube Gradle Plugin

Update sonarqube dependency

 
dependencies {
     classpath "org.sonarsource.scanner.gradle:sonarqube-gradle-plugin:2.1-rc1"
}

Update sonar version

 
sonarqube {
     version='2.1-rc1'
}

Update sonar-findbugs-plugin

dependencies {
     compile: 'org.codehaus.sonar-plugins.java', name: 'sonar-findbugs-plugin', version: '3.2'
}

Update Findbugs

Update findbugs dependency

dependencies {
     compile: 'com.google.code.findbugs', name: 'findbugs', version: '3.0.1'
}

Update Findbugs version

findbugs {
     toolVersion = "3.0.1"
     ignoreFailures = true
     sourceSets = [ project.sourceSets.main ]
}