New instance of class annotated with @groovy.lang.Singleton

Reports new instance creation of classes annotated with @groovy.lang.Singleton. Such constructions can lead to runtime exception Can't instantiate singleton.

Example:

  @Singleton
  class Foo{
  }
  
  Foo foo = new Foo()

After the quick-fix is applied:

  @Singleton
  class Foo{
  }
  
  Foo foo = Foo.instance

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.

NewInstanceOfSingleton

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 | Groovy | Potentially confusing code constructs

Inspection ID: NewInstanceOfSingleton

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 NewInstanceOfSingleton

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

IntelliJ IDEA 2025.3

Inspection Details
By default bundled with:	IntelliJ IDEA 2025.3, Qodana for JVM 2025.3,

Last modified: 03 December 2025