Ufdjrw

I have spring boot app. I am trying to read json file which is located in my resource folder (using class loader). I have deployed my app on azure its giving me error no such file exist and when i print path it is giving me null.

I tried to create a simple Maven project to fix your issue.

My source code structure is like below.

simpleMavenProj
 |-src/main/java/Hello.java
 |-src/main/resources/hello.json

The content of Hello.java is as below.

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;

public class Hello 

 public static void main(String[] args) throws IOException 
 InputStream resourceInputStream = null;
 URL resourceURL = Hello.class.getClassLoader().getResource("resources/hello.json");
 if(resourceURL == null) 
 System.out.println("Get the InputStream of hello.json in IDE");
 resourceInputStream = new FileInputStream(Hello.class.getClassLoader().getResource("").getPath()+"../../src/main/resources/hello.json");
 else 
 System.out.println("Get the InputStream of hello.json from runnable jar");
 resourceInputStream = Hello.class.getClassLoader().getResourceAsStream("resources/hello.json");
 
 System.out.println();
 StringBuilder builder = new StringBuilder();
 BufferedReader br = new BufferedReader(new InputStreamReader(resourceInputStream));
 String line = null;
 while((line = br.readLine()) != null) 
 builder.append(line+"n");
 
 br.close();
 System.out.println(builder.toString());
 

And hello.json:

 "hello":"world"

If you are developing in an IDE, run the code and the result is:

Get the InputStream of hello.json in IDE


 "hello":"world"

Else for generating a runable jar file, then to run the jar file via java -jar simpleMavenProj.jar and the result is:

Get the InputStream of hello.json from runnable jar


 "hello":"world"

Hope it helps. Any concern, please feel free to let me know.