Cannot resolve method 'List.of(java.lang.String, java.lang.String)'

Question

I've been trying to create a simple hello world application with Java and SpringBoot in IntelliJ IDEA, but I get this error and I don't know how to solve it.

I get the error at the return. Java doesn't seem to know how to resolve the of method that's in the public List<String> getHelloWorld method.

package com.myname.SpringApp;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;


@RestController
public class HelloWorldController {
    @RequestMapping("api/hello-world")
    @GetMapping
    public List<String> getHelloWorld(){
        return List.of("Hello", "World");
    }
}

The List.of(..) is available in JDK9+ as far as I know. So my assumption is you are using JDK8... — khmarbaise
– khmarbaise, Commented Apr 15, 2019 at 17:43
You can use Arrays.asList in earlier Java versions (Collections.unmodifableList(Arrays.asList(...)), if you're being picky). — Andy Turner
– Andy Turner, Commented Apr 15, 2019 at 17:55

Savior · Accepted Answer · 2019-04-15 17:46:15Z

19

The overloaded List.of methods were introduced in Java 9.

Since:
9

You must be compiling with an older version. Update to Java 9 or later. Here's how.

edited Apr 15, 2019 at 17:46

answered Apr 15, 2019 at 17:43

Savior

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Rijo · Accepted Answer · 2022-10-29 11:45:02Z

3

You can use Arrays.asList.

List.of will support java 9 and above

answered Oct 29, 2022 at 11:45

Rijo

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Comments

Dhruv · Accepted Answer · 2025-02-04 15:13:35Z

To make this code compatible with Java 8, you'll need to adjust the usage of List.of(), which was introduced in Java 9, and use a method that works in Java 8, such as Arrays.asList().


import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.Arrays;
import java.util.List;

@RestController
public class HelloWorldController {

    @RequestMapping("api/hello-world")
    @GetMapping
    public List<String> getHelloWorld() {
        return Arrays.asList("Hello", "World");
    }
}

Explanation:

List.of() is not available in Java 8, so I've replaced it with Arrays.asList(), which creates a fixed-size list.

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