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error when running java swing application from console [duplicate]

When running a Java app from eclipse my ImageIcon shows up just fine.
But after creating a jar the path to the image obviously gets screwed up.
Is there a way to extract an image from the jar at runtime so I can then open it up? Or, is there a better way to do this?
I'd like to distribute a single jar file if possible.

To create an ImageIcon from an image file within the same jars your code is loaded:
new javax.swing.ImageIcon(getClass().getResource("myimage.jpeg"))
Class.getResource returns a URL of a resource (or null!). ImageIcon has a constructors that load from a URL.
To construct a URL for a resource in a jar not on your "classpath", see the documentation for java.net.JarURLConnection.

You can try something like:
InputStream stream = this.getClass().getClassLoader().getResourceAsStream("/images/image.jpg");
In your JAR file, you might have a directory structure of:
MyJAR.jar
- com (class files in here)
- images
----image.jpg

This is working for me to load and set the content pane background image:
jar (or build path) contains:
- com
- img
---- bg.png
java contains:
JFrame f = new JFrame("Testing load resource from jar");
try {
BufferedImage bg = ImageIO.read(getClass().getResource("/img/bg.png"));
f.setContentPane(new ImagePanel(bg));
} catch (IOException e) {
e.printStackTrace();
}
Tested and working in both jar and unjarred (is that the technical term) execution.
BTW getClass().getClassLoader().getResourceAsStream("/img/bg.png") - which I tried first - returned me a null InputStream.

In netbeans 8.1 what I've done is to include the folder of icons and other images called Resources inside the src folder in the project file. So whenever i build Jar file the folder is included there.The file tree should be like this:
src (Java files in source packges are here)
** PACKAGE YOU NAMED IN PROJECT**
file.java
Resources
image.jpg
The code should be like:
jToggleButton1.setIcon(new javax.swing.ImageIcon(this.getClass().getResource("/resources/image.jpg")));

Load image in from Jar file during run time is the same as loading image when executed from IDE e.g netbeans the difference is that when loading image from JAR file the path must be correct and its case sensitive (very important).
This works for me
image1 = new javax.swing.ImageIcon(getClass().getResource("/Pictures/firstgame/habitat1.jpg"));
img = image1.getImage().getScaledInstance(lblhabitat1.getWidth(), lblhabitat1.getHeight(), Image.SCALE_SMOOTH);
lblhabitat1.setIcon(new ImageIcon(img));
if p in "/Pictures/firstgame/habitat1.jpg" is in lower case it wont work. check spaces, cases and spelling

Images don't show after eclipse project export as jar [duplicate]

When running a Java app from eclipse my ImageIcon shows up just fine.
But after creating a jar the path to the image obviously gets screwed up.
Is there a way to extract an image from the jar at runtime so I can then open it up? Or, is there a better way to do this?
I'd like to distribute a single jar file if possible.

To create an ImageIcon from an image file within the same jars your code is loaded:
new javax.swing.ImageIcon(getClass().getResource("myimage.jpeg"))
Class.getResource returns a URL of a resource (or null!). ImageIcon has a constructors that load from a URL.
To construct a URL for a resource in a jar not on your "classpath", see the documentation for java.net.JarURLConnection.

You can try something like:
InputStream stream = this.getClass().getClassLoader().getResourceAsStream("/images/image.jpg");
In your JAR file, you might have a directory structure of:
MyJAR.jar
- com (class files in here)
- images
----image.jpg

This is working for me to load and set the content pane background image:
jar (or build path) contains:
- com
- img
---- bg.png
java contains:
JFrame f = new JFrame("Testing load resource from jar");
try {
BufferedImage bg = ImageIO.read(getClass().getResource("/img/bg.png"));
f.setContentPane(new ImagePanel(bg));
} catch (IOException e) {
e.printStackTrace();
}
Tested and working in both jar and unjarred (is that the technical term) execution.
BTW getClass().getClassLoader().getResourceAsStream("/img/bg.png") - which I tried first - returned me a null InputStream.

In netbeans 8.1 what I've done is to include the folder of icons and other images called Resources inside the src folder in the project file. So whenever i build Jar file the folder is included there.The file tree should be like this:
src (Java files in source packges are here)
** PACKAGE YOU NAMED IN PROJECT**
file.java
Resources
image.jpg
The code should be like:
jToggleButton1.setIcon(new javax.swing.ImageIcon(this.getClass().getResource("/resources/image.jpg")));

Load image in from Jar file during run time is the same as loading image when executed from IDE e.g netbeans the difference is that when loading image from JAR file the path must be correct and its case sensitive (very important).
This works for me
image1 = new javax.swing.ImageIcon(getClass().getResource("/Pictures/firstgame/habitat1.jpg"));
img = image1.getImage().getScaledInstance(lblhabitat1.getWidth(), lblhabitat1.getHeight(), Image.SCALE_SMOOTH);
lblhabitat1.setIcon(new ImageIcon(img));
if p in "/Pictures/firstgame/habitat1.jpg" is in lower case it wont work. check spaces, cases and spelling

images not showing up when running JAR

I've spend 5 hours already and have no idea why images are not loaded when running Jar.
Project structure:
Blackjack_Game
- Source Packages
- Images
- blackjack
.... classes...
At project properties I have src - Source Packages folder added by default. Tried to put images directly into the project's folder and removing /Images/, but still no help.
Inside the code I have:
dealer_url = getClass().getResource("/Images/4_of_hearts.jpg");
File img = new File(dealerCardGenerator.dealer_url.getPath());
BufferedImage bufferedImage = ImageIO.read(img);
dealerCardGenerator.imageIcon = new ImageIcon(bufferedImage);
So inside NetBeans IDE everything is OK. Fully working. But after built&clean I see no images, but all actions are done.
Can you please suggest what is wrong? Getting so mad because of this ((((

A jar entry is not a file. java.io.File can only identify a file, not a jar entry. java.net.URL however can identify a jar entry using the jar: scheme, or a file using the file: scheme. That's why Class.getResource() returns a URL not a File.
Two solutions:
use the URL: ImageIO.read(getClass().getResource("whatever"))
ImageIO can also use an already-opened stream, which classloader can provide:
ImageIO.read(getClass().getResourceAsStream("whatever"))
Duplicate of at least #2-4 of the questions autosuggested as related:
Including Images with an executable jar
Loading images in a jar
Getting images from a .jar file

Thank you all for clarifying the problem. I've realized why some functions were not working.
So the solution is to replace URL with ImageIcon:
ImageIcon i2 = new javax.swing.ImageIcon(getClass().getResource("whatever"));
and then just set icon as label icon:
jLabel1.setIcon(i2);
In this way JAR works. Previously, all methods after this icon set operation were not working, as the program was actually stopped, now everything works fine.

Can't read input file when compressed as a jar

I am trying to run a jar file in terminal when I get this error:
I can run this file fine in my IDE, but when I export the project as a jar, it cannot find the file. Here is the code that the error points to:
BufferedImage buttonIcon = ImageIO.read(new File("img/button.png"));
button = new JButton(new ImageIcon(buttonIcon));

There are two issues.
You need to put the file into the jar.
You need to use getResourceAsStream(...) to use the class loader to load from the jar.
To verify the image presence in the jar file, use the command jar -tf jarfile.jar and see if button.png is in the jar, where it is expected. If it is not, look into altering your jar packaging.
As for the getResourceAsStream(...) there are many who have already offered how to do this properly. Look to their answers.

If you want to read that file from inside your JAR use:
BufferedImage buttonIcon = ImageIO.read( getClass().getResourceAsStream("/classpath/to/my/file"));

Try this one:
String imgPath = "img/button.png";
BufferedImage buffImage = ImageIO.read(getClass().getResourceAsStream(imgPath));

Use the following:
ImageIO.read(getClass().getClassLoader().getResource(path));
make sure the path doesn't contain the src folder (but keep the images in the actual folder)
path = "image.jpg";

Java won't export my resources properly

So I have 2 class folders one is res the other is lib. My res folder has two other sub folders one with images the other with sounds. My lib folder has 4 other jar files and a native folder. It all works within eclipse but when I try to export it as a runnable jar it does not work. I won't won't recognize anything.
I am to call my images I am using ImageIO.read(new File(imagePath)); For the sound I am using the external libraries I mentioned earlier to load and play them.

I am to call my images I am using ImageIO.read(new File(imagePath))
Contrary to your title, this is not an Eclipse problem - it's simply a bug in your code, because your code assumes that the image is stored as a file in the file system, when it's not.
You don't have a file for the image, so you shouldn't use new File. You should instead use Class.getResource or ClassLoader.getResource - or the getResourceAsStream equivalents. That way, it will load the resource from whatever context the class itself is loaded, which is appropriate for jar files. So for example, you might have:
Image image = ImageIO.read(MyClass.getResource("foo.png"));
... where foo.png is effectively in the same package structure as the class. Alternatively:
Image image = ImageIO.read(MyClass.getResource("/images/foo/bar.png"));
where images is a folder within the root directory of one of your jar files loaded by the same ClassLoader. (We don't have enough information to give you complete code here, but that should be enough to get you going.)