Unsafe cast of open service

Reports code that casts a service declared with open="true" to a more specific class than the service interface.

When a service is marked as "open" in its plugin.xml registration, it can be overridden by other plugins with a different implementation. Casting such a service to a specific implementation class is unsafe because the actual instance at runtime may be a different class, leading to ClassCastException.

Example:

  <!-- plugin.xml -->
  <extensions defaultExtensionNs="com.intellij">
    <projectService serviceInterface="com.example.MyService"
                    serviceImplementation="com.example.MyServiceImpl"
                    open="true" />
  </extensions>

  // Bad: Casting open service to specific implementation
  MyServiceImpl impl = (MyServiceImpl) project.getService(MyService.class);

Instead, use only the declared service interface:

  // Good: Using the service interface
  MyService service = project.getService(MyService.class);

Locating this inspection

By ID

Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

UnsafeOpenServiceCast

Via Settings dialog

Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.

Settings or Preferences | Editor | Inspections | Plugin DevKit | Code

Inspection ID: UnsafeOpenServiceCast

Suppressing Inspection

You can suppress this inspection by placing the following comment marker before the code fragment where you no longer want messages from this inspection to appear:

//noinspection UnsafeOpenServiceCast

More detailed instructions as well as other ways and options that you have can be found in the product documentation:

IntelliJ IDEA 2026.2

Inspection Details
By default bundled with:	IntelliJ IDEA 2026.2, Qodana for JVM 2026.2,

Last modified: 30 June 2026