'ThreadLocalRandom' instance might be shared
Reports java.util.concurrent.ThreadLocalRandom instances which might be shared between threads.
A ThreadLocalRandom should not be shared between threads because that is not thread-safe. The inspection reports instances that are assigned to a field used as a method argument, or assigned to a local variable and used in anonymous or nested classes as they might get shared between threads.
Usages of ThreadLocalRandom should typically look like ThreadLocalRandom.current().nextInt(...) (or nextDouble(...) etc.). When all usages are in this form, ThreadLocalRandom instances cannot be used accidentally by multiple threads.
Example:
class Main {
void printRandomNumbersAsync() {
ThreadLocalRandom random = ThreadLocalRandom.current();
CompletableFuture.supplyAsync(() -> generateNumbers(random))
.thenAccept(numbers -> System.out.println(Arrays.toString(numbers)));
}
private int[] generateNumbers(Random random) {
return random.ints(1000, 0, 100).toArray();
}
}- 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.
SharedThreadLocalRandom
Use the options to list methods that are safe to be passed to ThreadLocalRandom instances as an argument. It's possible to use regular expressions for method names.
Here you can find the description of settings available for the 'ThreadLocalRandom' instance might be shared inspection, and the reference of their default values.
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 SharedThreadLocalRandomnote
Actual comment syntax will depend on the code language you are working with
More detailed instructions as well as other ways and options that you have can be found in the product documentation:
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By default bundled with: |