How can I configure Intellij to run my Java program?

Question

I am attempting to run my program. However, when I click run, no output window shows up. In addition, when I go to View --> Tool Windows, the Run option is disabled.

My main class just in case anyone was wondering:

import org.apache.http.impl.client.HttpClientBuilder;
import org.junit.Test;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import static junit.framework.TestCase.assertEquals;

public class TesterClass {
public static void main(String[] args) {
    String url = "https://erikberg.com/nba/standings.json";
    HttpClient client = HttpClientBuilder.create().build();
    HttpGet request = new HttpGet();
    request.addHeader("User-agent", "LotterySimulator/1.0 (nneeranjun@berkeley.edu)");
    HttpResponse response = null;
    try {
        response = client.execute(request);
    } catch (IOException e) {
        e.printStackTrace();
    }
    try {
        System.out.println(response.getEntity().getContent());
    } catch (IOException e) {
        e.printStackTrace();
    }

}

}

https://www.jetbrains.com/help/idea/creating-and-running-your-first-java-application.html. — CrazyCoder, Aug 23 '18 at 08:16
I don't understand why the question has 4 downvotes and two answers with one upvote each. How can the question be so bad and those answers so good? — , Aug 23 '18 at 23:00
@YvetteColomb "and those answers so good" .. with one upvote each, that's a bit of a stretch. Anyway OP said he has a main method and that he did what the answers suggested, so this is nothing more than a "guessing game". That's not a question suitable for Stackoverflow. — Tom, Aug 23 '18 at 23:02
@Tom yeh, they're not "so" good. I'm querying the disparity between the up and down votes. My thinking is if the question is not worth upvoting (i.e on topic). it's not worth answering. Or, it a question is worth answering it's worth upvoting. I haven't had coffee yet, don't blame me for my convoluted words, talking thingo :D — , Aug 23 '18 at 23:07
@YvetteColomb This thinking works for you as an individual person, but we don't know how many persons acted on this question and if there are people who answered (or upvoted one of the answers) and downvoted the question as well. There are surely also people who still would answer a question even when they downvoted it. — Tom, Aug 23 '18 at 23:22

score 1 · Answer 1 · answered Aug 23 '18 at 08:21

1

Most probably you don't have a main entry point

Create a new class with any name you see fit.
Type psvm and hit tab, that will generate a main method.
Click on the green play arrow on the left.

answered Aug 23 '18 at 08:21

Samuel Kodytek

1,004
2
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23

I do have a main method. It was running perfectly fine before. It just stopped working – nilay neeranjun Aug 23 '18 at 17:13
@nilayneeranjun what about the green play button next to the main method as it is shown in the image? – Samuel Kodytek Aug 23 '18 at 20:32
Yes. I am able to press the run button. However, nothing happens and no run panel shows up – nilay neeranjun Aug 23 '18 at 22:19

score 1 · Answer 2 · answered Aug 23 '18 at 08:23

The Run option under View --> Tool Windows is not used to run a program. It is used to toggle display for the run panel. The option is grayed out because there is no panel to currently toggle.

As for running the program, you need to have a run configuration setup with a valid JDK, main class, and module. The main class specified in the run configuration also needs to have the method with signature: public static void main(String[]). Alternatively, if you have the file containing such method open in the editor, you should be able to run it by either clicking the green arrow in the gutter on the left side or by going to Run -> Run "MyClass"

Dude I understand this. I have a main method. I can't run it. That's the problem. There is no run panel showing up. — nilay neeranjun, Aug 23 '18 at 17:14

score 0 · Answer 3 · answered Aug 23 '18 at 22:33

0

You could try this. Go to "Edit Configurations...":

And then select your main class here:

answered Aug 23 '18 at 22:33

Marc Dirven

309
2
18

I have already done this – nilay neeranjun Aug 23 '18 at 22:47

How can I configure Intellij to run my Java program?

3 Answers3