FileNotFoundException in src/main/resources

Question

i placed a file in my maven project under src/main/resources the files name is simply temp.txt.

When i try to open the file:

BufferedReader br = new BufferedReader(new FileReader(new File("./temp.txt")));

I get an error:

Exception in thread "main" java.io.FileNotFoundException: \temp.txt

all files under src/main/resources are placed in the root folder of the classpath under maven. So why cant the program find the file here?

Answer 1

If you're going to package the file in the class path, then read it as such.. from the class path.

Maven Structure

src
   main
       resources
               file.txt

After it builds, the file gets placed in the root of the class path. So use

InputStream is = getClass().getResourceAsStream("/file.txt");
BufferedReader reader = new BufferedReader(new InputStreamReader(is));

The / in front of file.txt will bring you to the root, from whatever package the class is in.

---

UPDATE

Test example

package com.underdogdevs.stackoverflow;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

public class TestResourceFile {

    public static void main(String[] args) throws IOException {
        InputStream is = TestResourceFile.class.getResourceAsStream("/test.txt");
        BufferedReader reader = new BufferedReader(new InputStreamReader(is));
        String line;
        while ((line = reader.readLine()) != null) {
            System.out.println(line);
        }
    }
}

Answer 2

just give this as your path:

BufferedReader br = new BufferedReader(new FileReader(new 
File("src/main/resources/temp.txt")));

Answer 3

Had this problem when setting up integration tests in Jenkins.
The issue was caused by having the job inside a folder with spaces in the name. So instead of having a workspace folder named foo bar, Jenkins created foo%20bar and the tests all failed with FileNotFoundException.

The solution is just to rename your folder so it doesn't have any spaces.

Answer 4

Maven puts the files under /src/main/resouces/ into the default package of your classpath. Hence you can load through the classloader:

InputStream in = getClass().getResourcesAsStream("temp.txt")

For more information see Class#getResoucesAsStream.