Java. Cannot import SHA256withRSA signature from import java.security.Signature

Question

I'm trying to initialize SHA256withRSA Signature object:

Signature signer = Signature.getInstance("SHA256withRSA");

But compiler generates NoSuchAlgorithmException, but when I run this code:

import java.security.Signature;

public static void main(String[] args) throws IOException{
    TreeSet<String> algorithms = new TreeSet<>();
    for (Provider provider : Security.getProviders())
        for (Provider.Service service : provider.getServices())
            if (service.getType().equals("Signature"))
                algorithms.add(service.getAlgorithm());
    for (String algorithm : algorithms)
        System.out.println(algorithm);
}

It creates output:

...
SHA256withECDSAinP1363Format
SHA256withRSA
SHA384withECDSA
...

What i'm doing wrong or what libraries should I include into project?