Suspicious 'Collection.toArray()' call

Reports suspicious calls to Collection.toArray().

The following types of calls are considered suspicious:

when the type of the array argument is not the same as the array type to which the result is casted.
when the type of the array argument does not match the type parameter in the collection declaration.

Example:

void m1(List list) {
  Number[] ns = (Number[]) list.toArray(new String[0]);
}

void m2(List<Number> list) {
  Number[] ns = list.toArray(new String[0]);
}

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.

SuspiciousToArrayCall

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

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 SuspiciousToArrayCall

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