IntelliJ cannot resolve symbol "newFixedThreadPool"

Question

I'm new to IntelliJ and Java in general. I'm trying to learn multithreading and I came across the Executors class.

So I wanted test this, here is a sample of my code.

import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;


public class LegController {
    private List<Runnable> legs;
    private ExecutorService execute;

    public LegController() {
        legs = new ArrayList<>();
        for (int i = 0; i < 6; i++) {
            legs.add(LegFactory.getLeg("LEFT"));
        }

        execute = new Executors.newFixedThreadPool(6);
    }

    public void start(){

        //TODO
    }
}

But I get an error : "Cannot resolve symbol 'newFixedThreadPool'". I tried "Invalidate cache and restart" but it didn't help, I tried synchronise and rebuild project, but it didn't work either.

I don't understand where this problem is coming from because the class Executors is imported. Besides, there was autocompletion for the static methods of Executors. Maybe there is a problem in the importation, but if so, how could I fix it ?

I'd guess you want `execute = Executors.newFixedThreadPool(6);`, i.e. without the `new` keyword, which makes the compiler expect a constructor call (and don't call a constructor). — Thomas, Dec 09 '16 at 13:25
also there is no Executors.newSingleThreadExecutor(int) method. — Alexander Perfilyev, Dec 09 '16 at 13:26

score 27 · Accepted Answer · answered Dec 09 '16 at 13:26

27

Remove the keyword new in this line:

execute = new Executors.newFixedThreadPool(6);

It should be:

execute = Executors.newFixedThreadPool(6);

The method newFixedThreadPool is a static method of class Executors.

answered Dec 09 '16 at 13:26

Jesper

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Thanks a lot, in fact I did put the keyword new by reflex and thus didn't noticed it. – Irindul Dec 09 '16 at 13:27

score 1 · Answer 2 · answered Dec 09 '16 at 13:28

Remove the new keyword from this line:

execute = Executors.newFixedThreadPool(6);

Your syntax actually tries to call the constructor of a static inner class 'newFixedThreadPool' within the Executor class. That static inner class does not exist. Instead, you have to call a static factory method...

IntelliJ cannot resolve symbol "newFixedThreadPool"

2 Answers2