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

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.

CancellationCheckInLoops

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New in 2023.1

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 CancellationCheckInLoops

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