SonarQube coverage doesn't work for Ruby SimpleCov v0.21.2

I’m using latest sonarsource/sonar-scanner-cli Docker image.

I’m trying to display tests coverage in SonarQube’s dashboard.

I tried using coverage/coverage.json file produced by SimpleCov v0.21.2 JSONFormatter. I’m getting the following error:

INFO: Sensor SimpleCov Sensor for Ruby coverage [ruby]
ERROR: Cannot read coverage report file, expecting standard SimpleCov resultset JSON format: 'coverage/coverage.json'
java.lang.NullPointerException: null
	at org.sonarsource.ruby.plugin.SimpleCovSensor.mergeFileCoverages(SimpleCovSensor.java:119)
	at org.sonarsource.ruby.plugin.SimpleCovSensor.safeReadCoverageReport(SimpleCovSensor.java:83)
	at org.sonarsource.ruby.plugin.SimpleCovSensor.lambda$execute$0(SimpleCovSensor.java:72)
	at java.base/java.util.HashMap.forEach(Unknown Source)
	at org.sonarsource.ruby.plugin.SimpleCovSensor.execute(SimpleCovSensor.java:72)
	at org.sonar.scanner.sensor.AbstractSensorWrapper.analyse(AbstractSensorWrapper.java:48)
	at org.sonar.scanner.sensor.ModuleSensorsExecutor.execute(ModuleSensorsExecutor.java:85)
	at org.sonar.scanner.sensor.ModuleSensorsExecutor.lambda$execute$1(ModuleSensorsExecutor.java:59)
	at org.sonar.scanner.sensor.ModuleSensorsExecutor.withModuleStrategy(ModuleSensorsExecutor.java:77)
	at org.sonar.scanner.sensor.ModuleSensorsExecutor.execute(ModuleSensorsExecutor.java:59)
	at org.sonar.scanner.scan.ModuleScanContainer.doAfterStart(ModuleScanContainer.java:82)
	at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:137)
	at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:123)
	at org.sonar.scanner.scan.ProjectScanContainer.scan(ProjectScanContainer.java:393)
	at org.sonar.scanner.scan.ProjectScanContainer.scanRecursively(ProjectScanContainer.java:389)
	at org.sonar.scanner.scan.ProjectScanContainer.doAfterStart(ProjectScanContainer.java:358)
	at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:137)
	at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:123)
	at org.sonar.scanner.bootstrap.GlobalContainer.doAfterStart(GlobalContainer.java:144)
	at org.sonar.core.platform.ComponentContainer.startComponents(ComponentContainer.java:137)
	at org.sonar.core.platform.ComponentContainer.execute(ComponentContainer.java:123)
	at org.sonar.batch.bootstrapper.Batch.doExecute(Batch.java:72)
	at org.sonar.batch.bootstrapper.Batch.execute(Batch.java:66)
	at org.sonarsource.scanner.api.internal.batch.BatchIsolatedLauncher.execute(BatchIsolatedLauncher.java:46)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.base/java.lang.reflect.Method.invoke(Unknown Source)
	at org.sonarsource.scanner.api.internal.IsolatedLauncherProxy.invoke(IsolatedLauncherProxy.java:60)
	at com.sun.proxy.$Proxy0.execute(Unknown Source)
	at org.sonarsource.scanner.api.EmbeddedScanner.doExecute(EmbeddedScanner.java:189)
	at org.sonarsource.scanner.api.EmbeddedScanner.execute(EmbeddedScanner.java:138)
	at org.sonarsource.scanner.cli.Main.execute(Main.java:112)
	at org.sonarsource.scanner.cli.Main.execute(Main.java:75)
	at org.sonarsource.scanner.cli.Main.main(Main.java:61)

INFO: Sensor SimpleCov Sensor for Ruby coverage [ruby] (done) | time=32ms

The coverage/coverage.json file looks like this:

{
  "meta": {
    "simplecov_version": "0.21.2"
  },
  "coverage": {
    "/app/app/api/api_app.rb": {
      "lines": [
        null,
        null,
        1,
        1,
        null,
        null,
        1,
        null,
        1,
        null,
        1,
        null,
        null,
        null,
        null,
        1,
        1,
        null,
        1,
        null,
        0,
        0,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null,
        null
      ]
    },

I’ve found a few topics and a ticket saying that SimpleCov >= v0.20 + JSONFormatter should work, but that’s not true for me. Am I missing something?

Hi there.

What version of SonarQube are you using?

Hi! The version is 8.6.0.39681 if I’m looking in the right place.

Any thoughts?