Unused 'catch' parameter

Reports catch parameters that are unused in their corresponding blocks. This inspection will not report any catch parameters named "ignore" or "ignored".

Example:

  try {
      def arr = new int[3]
      arr[5] = 5
  } catch(Exception ex) {
      println('Catching the exception')
  }

Here the parameter ex is never used in catch block.

After the quick-fix is applied:

  try {
      def arr = new int[3]
      arr[5] = 5
  } catch(Exception ignored) {
      println('Catching the exception')
  }

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.

GroovyUnusedCatchParameter

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 | Error handling

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 GroovyUnusedCatchParameter

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