[SOLVED] getResourceAsStream returns NullpointerException

getResourceAsStream returns NullpointerException

In Spring, I want to get the image to display on my browser. The image is located in my main project i.e.

> myproject
   - src
   - target
   - img.png

This means that img.png is in the root so I dont supply any path but it returns a NullPointerException. I tried adding the image in src and I changed path to src\img.png but still gave NPE.

Please note, this project is using Maven.

Stack Trace:

java.lang.NullPointerException: null
    at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:1792) ~[commons-io-2.4.jar:2.4]
    at org.apache.commons.io.IOUtils.copyLarge(IOUtils.java:1769) ~[commons-io-2.4.jar:2.4]
    at org.apache.commons.io.IOUtils.copy(IOUtils.java:1744) ~[commons-io-2.4.jar:2.4]
    at org.apache.commons.io.IOUtils.toByteArray(IOUtils.java:462) ~[commons-io-2.4.jar:2.4]

Here is the code I use:

InputStream in = DataService.class.getResourceAsStream("img.png");

        final HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.IMAGE_PNG);

        result.setData(new ResponseEntity<byte[]>(IOUtils.toByteArray(in), headers, HttpStatus.CREATED));

Comments on this question being marked for closure:

The question is related to programming as the API getResourceAsStream says this:

Returns A URL object or null if no resource with this name is found

My code was returning null even when I tried adding img.png to different locations.

This question is not a duplicate of this: getResourceAsStream() is always returning null

The answer in that question says that the file must be in the same directory as this but in this question, even though I added the image to the same location where class DataService was, it did not work.

Solution

When the project setup is done using Maven, adding the image to resources folder worked. Nothing from the code changed:

DataService.class.getClassLoader().getResource("img.png")