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";
Related
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
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
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
I can't seem to get this right...
I have a Java project in Eclipse called MyProject. In its root is the folders bin, src, and resources. Inside of resources, I have an image named myImage.gif.
In my code, I want to use this image, and I want it to work whether or not this is running from a Jar file. I currently am doing this
ImageIcon j = new ImageIcon(getClass().getResource("/resources/myImage.gif"));
but it is spitting out a null when I run it through Eclipse (not as a Jar).
What is the right way to do this?
If you were to tell Eclipse to treat resources as a source folder then you should be able to say
ImageIcon j = new ImageIcon(getClass().getResource("/myImage.gif"));
When you come to build the JAR you'll have to ensure that the contents of the resources directory go into the top level of the JAR file in order for the same path to work in the JAR case, i.e.
META-INF
MANIFEST.MF
com
example
MyClass.class
myImage.gif
Alternatively, and probably the more common Java idiom, put the image file in the same directory as the .java file (src/com/example in this case) and then use getResource without the leading slash
new ImageIcon(getClass().getResource("myImage.gif"));
Class.getResource resolves a relative path like that against the package of the class in question. Again, you need to have the same structure in the JAR when you come to build that, this time with myImage.gif under com/example.
Place resources into src and Eclipse will copy it into bin.
ImageIcon ii =
new ImageIcon(
ImageIO.read(
getClass().getClassLoader().getResourceAsStream(
"resources/myImage.gif" )));
Without / before the path.
I have a jar file that contains an exe and banner image (jpg) that the entire script depends on. How can I access and use these 2 dependencies from itself (the jar file)? Currently the jpg is accessed by:
BufferedImage getBanner = ImageIO.read(new File("banner.jpg"));
JLabel drawBanner = new JLabel(new ImageIcon(getBanner));
and the exe is accessed by:
String cmd = "exe [params]";
Runtime run = Runtime.getRuntime();
Process pr = run.exec(cmd);
I might even host the banner image online and just have it pull it from there, so I can dynamically update that.
The Classloader for the jre can "find" any file in your classpath.
To add an external program, so that its accessible to your jar :
First create a class loader and use your ClassLoader to get the resource dynamically, and let it handle the path specific details of the file location. Thus ... you will do something like this :
URL myExecutable =
MyClass.class.getClassLoader().getResource("executable/program.exe");
Now, you should be able to DIRECTLY access the program , as if it is any other file.
File f=new File(myExecutable.toURI());
And now you can call it using
Runtime.getRuntime().exec(f.getAbsolutePath());
CAVEAT
At this point, ask yourself WHY AM I BUNDLING AN EXE IN A JAR FILE ? Better to have a separate package for each operating system platform, in a zip file. Put the jar and the exe in a zip file --- rather than bundling the OS specific executable to your java binary.