Cancellation check in loops

Reports loops, forEach-like methods, and ContainerUtil.process() with missing cancellation checks.

Runs only within the methods with com.intellij.util.concurrency.annotations.RequiresReadLock annotation.

Example:

@RequiresReadLock
fun doSomething() {
  ...
  for (item in items) {
    ProgressManager.checkCanceled() // should be present in the first line
    ...
  }

  items.forEach {
    ProgressManager.checkCanceled() // should be present in the first line
    ...
  }
  ...
}

In the case of nested loops with nothing in between:

@RequiresReadLock
fun doSomething() {
  ...
  for (item in items) {
    // nothing in between
    for (inner in item.inners) {
      ProgressManager.checkCanceled() // should be present in the first line of the inner loop only
      ...
    }
  }
  ...
}

In blocking context com.intellij.openapi.progress.ProgressManager.checkCanceled() should be used, while com.intellij.openapi.progress.CoroutinesKt.checkCancelled() should be used in suspending one.

See Background Processes Cancellation in IntelliJ Platform Plugin SDK docs for more details.

Locating this inspection

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CancellationCheckInLoops

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New in 2023.1

Inspection ID: CancellationCheckInLoops

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 CancellationCheckInLoops

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