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Iterable is used as vararg

Reports suspicious usages of Collection or Iterable in vararg method calls.

For example, in the following method:

<T> boolean contains(T needle, T... haystack) {...}

a call like

if(contains("item", listOfStrings)) {...}

looks suspicious as the list will be wrapped into a single element array. Such code can be successfully compiled and will likely run without exceptions, but it's probably used by mistake.

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.

IterableUsedAsVararg
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 | Java | Probable bugs

This inspection depends on the Java feature 'Variable arity methods', which is available since Java 5.

New in 2019.2

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 IterableUsedAsVararg

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

Inspection Details

By default bundled with:

IntelliJ IDEA 2025.2, Qodana for JVM 2025.2,

Last modified: 18 September 2025