java.lang.NoClassDefFoundError: org/sonarsource/analyzer/commons/RuleMetadataLoader

SonarQube Server / Community Build Plugin Development
2

Hi,

Using the class directly from the sonar-java plugin is not possible due to the isolated classloaders utilized by the plugins, as explained in the SonarQube docs.

Plugins are loaded in isolated classloaders. It means a plugin can’t access another plugin’s classes. There is an exception for package names following pattern org.sonar.plugins.<pluginKey>.api . For example, all classes in a plugin with the key myplugin that are located in org.sonar.plugins.myplugin.api are visible to other plugins.

In general, a plugin cannot access classes from another plugin, except for those that follow that specific package naming convention. Therefore, only the SonarQube API and classes from org.sonar.plugins.java.api.* are available to your plugin.

This example seems to be relevant to what you’re implementing: https://github.com/SonarSource/sonar-java/blob/master/its/plugin/plugins/java-extension-plugin/src/main/java/org/sonar/samples/java/JavaExtensionRulesDefinition.java

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