GString map key

Reports statements which use a groovy.lang.GString object as a key to map. In general GString objects are mutable and probably should not be used as keys. Also, a GString entry cannot be accessed with a java.lang.String object with same value.

Example:

def map = [:]
def key = 'foo'
map &lt;&lt; ["${key}": 'bar']
assert map[key] == null // confusing 'true' result of comparison

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.

GroovyGStringKey

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

New in 2017.1

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 GroovyGStringKey

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

IntelliJ IDEA 2025.2

Inspection Details
By default bundled with:	IntelliJ IDEA 2025.2, Qodana for JVM 2025.2,

Last modified: 18 September 2025