Java BufferedImage throwing NullPointerException

Question

I am making a space shooter in Java, but when I try to load up the image resources, I get a null pointer exception. Everything works fine except the images. Am I coding the directory wrong? How can I fix it?

Here is my code:

BufferedReader highScoreReader;
BufferedWriter highScoreWriter;

try {
    playerImage = ImageIO.read(this.getClass().getResourceAsStream("src/res/player.png"));
    bulletImage = ImageIO.read(this.getClass().getResourceAsStream("src/res/bullet.png"));
    enemyImage = ImageIO.read(this.getClass().getResourceAsStream("src/res/enemy.png"));

    highScoreReader = new BufferedReader(new FileReader("/files/HIGH_SCORE.txt"));
    highScoreWriter = new BufferedWriter(new FileWriter("/files/HIGH_SCORE.txt"));
} catch (Exception e) {
    e.printStackTrace();
}

Here is a screenshot of my file directories:

Ian McLaird · Accepted Answer · 2016-04-12 03:26:08Z

2

Most probably, you need to copy your images into the build directory of your project. If you want them treated as classpath resources, which it seems you do, make sure they're in a source folder in eclipse (or, if you use maven or similar, in the src/main/resources folder. The point is, they need to be copied to the place where the .class file lives when it's running.

Remember: class.getResourceAsStream(...) returns things from the classpath not from your source path.

answered Apr 12, 2016 at 3:26

Ian McLaird

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Norsk · Accepted Answer · 2016-04-12 02:22:02Z

0

I've never seen it done that way.

Try this

try {
    playerImage = ImageIO.read(getClass().getClassLoader().getResourceAsStream("src/res/player.png"));
catch(IOException e) {
}

or

try {
    playerImage = ImageIO.read(new File("src/res/player.png"));
catch (IOException e) {
}

edited Apr 12, 2016 at 2:22

answered Apr 12, 2016 at 2:17

Norsk

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7 Comments

Arnav Garg Over a year ago

I tried this and it didn't work Are there any other problems?

Norsk Over a year ago

Can you tell us what the error is? You never specified what the problem is. What are you doing with the images?

Arnav Garg Over a year ago

I am drawing them to a frame. When I am running the code, the images are throwing me a NPE. Everything but the images work correctly.

Norsk Over a year ago

try removing "src" from your path to the images. Your FileReader manages to find it's files without it. And use the second method. Don't worry about getting it as a stream, just use ImageIO.read(new File(filepath))

Arnav Garg Over a year ago

I am still getting the error. Maybe its a glitch in eclipse.

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The Pascal King · Accepted Answer · 2016-12-20 03:32:38Z

0

Arnav Garg has discovered the problem.

When your code says something like: file("src/res/player.png") the file is not there, i.e. file.exists() will return false

Find out where java thinks the file is.

try using file.getAbsolutePath() and compare that to your directory structure.

answered Dec 20, 2016 at 3:32

The Pascal King

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