A plugin may depend on classes from other plugins, either bundled, third-party, or by the same author. This document describes the syntax for declaring plugin dependencies and optional plugin dependencies. For more information about dependencies on the IntelliJ Platform modules, see Part II of this document: Plugin Compatibility with IntelliJ Platform Products.
To express a dependency on classes from other plugins or modules, perform the following three required steps detailed below on this page:
Locate Plugin ID
Declaration in plugin.xml
java.lang.NoClassDefFoundError occurs at runtime, it means that either Step 3 was omitted or loading the plugin dependency failed (please check log files from Development Instance).
1. Locating Plugin ID and Preparing Sandbox
For plugins published on JetBrains Marketplace:
Open plugin's detail page
Select Versions tab
Open detail page for the desired version, displaying the Compatibility Range and Plugin ID
Bundled and Other Plugins
For bundled and non-public plugins, locate the plugin's main JAR file containing META-INF/plugin.xml descriptor with
<id> tag (or
<name> if not specified). Bundled plugins are located in $PRODUCT_ROOT$/plugins/$PLUGIN_NAME$/lib/$PLUGIN_NAME$.jar.
IDs of Bundled Plugins
Database Tools and SQL
If the plugin is not bundled with the target IDE, run the (sandbox) IDE Development Instance of your target IDE and install the plugin there.
2. Project Setup
Depending on the chosen development workflow (Gradle or DevKit), one of the two following steps is necessary.
If the project uses DevKit, add the JARs of the plugin on which the project depends to the Classpath of the IntelliJ Platform SDK.
To do that, open the Project Structure dialog, select the SDK used in the project, press the + button in the Classpath tab, and select the plugin JAR file(s):
For bundled plugins, the plugin JAR files are located in plugins/$PLUGIN_NAME$ or plugins/$PLUGIN_NAME$/lib under the main installation directory. If you're not sure which JAR to add, you can add all of them.
For non-bundled plugins, the plugin JAR files are located in config/plugins/$PLUGIN_NAME$ or config/plugins/$PLUGIN_NAME$/lib under the directory specified as Sandbox Home in the IntelliJ Platform Plugin SDK settings.
3. Dependency Declaration in plugin.xml
Regardless of whether a plugin project uses Modules Available in All Products, or Modules Specific to Functionality, the correct module must be listed as a dependency in plugin.xml. If a project depends on another plugin, the dependency must be declared like a module. If only general IntelliJ Platform features (APIs) are used, then a default dependency on
com.intellij.modules.platform must be declared.
In the plugin.xml, add a
<depends> tag with the dependency plugin's ID as its content. Continuing with the example from Project Setup above, the dependency declaration in plugin.xml would be:
Optional Plugin Dependencies
A plugin can also specify an optional plugin dependency. In this case, the plugin will load even if the plugin it depends on is not installed or enabled, but part of the plugin's functionality will not be available.
config-file attribute pointing to optional plugin descriptor file:
For example, if a plugin adds additional highlighting for Java and Kotlin files, use the following setup. The main plugin.xml will define an annotator for Java and specify an optional dependency on the Kotlin plugin (plugin ID
Then create a file called myPluginId-withKotlin.xml, in the same directory as the main plugin.xml file. In that file, define an annotator for Kotlin: