Loading images from a jar file

Hi,
My application displays images, until it's placed in a JAR file, then it can't display them even though the JAR file contains the images.
I saw this problem in a previous question which was solved using
URL url = MyClass.class.getResource("abc.gif");
Image img=Toolkit.getDefaultToolkit().getImage(url);
....which btw didn't work for me either......
This method should be made obsolete using ImageIcon, which I am using, but the images still won't appear...
Any suggestions?

It works fine that way (...getClass().getResource....) until I create the jar file, and then I get a null pointer exception when it tries to load the image.
When I use
javax.swing.ImageIcon icon = new javax.swing.ImageIcon(("/images/imageName.jpg"));
the application works but without the images.......

Similar Messages

Issues with Loading Images from a Jar File

This code snippet basically loops through a jar of gifs and loads them into a hashmap to be used later. The images all load into the HashMap just fine, I tested and made sure their widths and heights were changing as well as the buffer size from gif to gif. The problem comes in when some of the images are loaded to be painted they are incomplete it looks as though part of the image came through but not all of it, while other images look just fine. The old way in which we loaded the graphics didn't involve getting them from a jar file. My question is, is this a common problem with loading images from a jar from an applet? For a while I had tried to approach the problem by getting the URL of the image in a jar and passing that into the toolkit and creating the image that way, I was unsuccessful in getting that to work.
//app is the Japplet
MediaTracker tracker = new MediaTracker(app);
//jf represents the jar file obj, enum for looping through jar entries
Enumeration e = jf.entries();
Toolkit toolkit = Toolkit.getDefaultToolkit();
//buffer for reading image stream
byte buffer [];
while(e.hasMoreElements())
fileName = e.nextElement().toString();
InputStream inputstream = jf.getInputStream(jf.getEntry(fileName));
buffer = new byte[inputstream.available()];
inputstream.read(buffer);
currentIm = toolkit.createImage(buffer);
tracker.addImage(currentIm, 0);
tracker.waitForAll();
images.put(fileName.substring(0, fileName.indexOf(".")), currentIm);
} //while
}//try
catch(Exception e)
e.printStackTrace();
}

compressed files are not the problem. It is just the problem of the read not returning all the bytes. Here is a working implementation:
InputStream is = jar.getInputStream(entry);
ByteArrayOutputStream os = new ByteArrayOutputStream(1024);
try{
byte[] buf = new byte[1024];
int read;
while((read = is.read(buf)) > 0) {
os.write(buf, 0, read);
catch(Exception e){
e.printStackTrace();
return null;
image = Toolkit.getDefaultToolkit().createImage(os.toByteArray());
This works but I think you end up opening the jar a second time and downloading it from the server again. Another way of getting the images is using the class loader:
InputStream is = MyApplet.class.getResourceAsStream(strImageName);
In this case, the image file needs to be at the same level than MyApplet.class but you don't get the benefit of enumerating of the images available in the jar.

Read images from a jar file?

Hello, I'm converting a 6i app to 10g. This app does a ton of read_image_file() calls to
change GIF images on the screen based on user actions. In 6i the images are all stored on the local hard drive. The images are not icons for buttons, but images that appear in different locations on the screen.
For 10g, is it possible to leave the images in a jar file and effectively read the images from that? Otherwise, I suppose I'm looking at using webutil functionality to download the jar file and unjar it into an images directory for reading from the client?
Any best-practice scenario for this sort of thing?
Thanks for any info,
Gary

We are migrating from 6i to 10g too. And I try to not use webutil. All my pictures (icons gif files) are in a jar file.
Just make attention of the size of your pictures. The jar file is loaded when you launch the application (the first time, and after, only if the jar file has changed).

Read images from external jar file (Sun's Java L&F Graphics repository)

Hi!
I don't know how to read images from an external jar file. Sun has a Java Look and Feel graphics repository that contains a lot of good images that can be used on buttons and so on. This repository is delivered as a jar file, containing only images, and I want to read the image files from that jar file directly without including them inside my application jar file. The application and image jar files will be in the same directory.
I have absolutely no clue how to solve this. Is it necessary to include the images inside my application jar file or is it possible to have them separate as I want.
Would really appreciate some help!
Best regards
Lars

Hi,
There is two ways :
1) Add your jarfile to the classpath.
Use the class loader :
URL url = ClassLoader.getSystemResource("your/package/image.gif");
Image im = (new ImageIcon(url)).getImage();
or
Image im = Toolkit.getDefaultToolkit().getImage(url);2)If you don't want to add the jar to the classpath you can use this (under jdk 1.4):
import java.util.*;
import java.util.jar.*;
import java.awt.*;
import java.io.*;
import java.awt.image.*;
import javax.imageio.*;
public class ImageUtilities {
     public static Image getImage(String jarFileName, String fileName) {
          BufferedImage image = null;
          try {
               JarFile jar = new JarFile(new File(jarFileName), false, JarFile.OPEN_READ);
               JarEntry entry = jar.getJarEntry(fileName);
               BufferedInputStream stream = new BufferedInputStream(jar.getInputStream(entry));
               image = ImageIO.read(stream) ;
          catch (Exception ex) {
               System.out.println(ex);
          return(image);
}I hope this helps,
Denis

Is it possible to load classes from a jar file

Using ClassLoader is it possible to load the classes from a jar file?

URL[] u = new URL[1] ;
u[0] = new URL( "file://" + jarLocation + jarFileName + "/" );
URLClassLoader jLoader = new URLClassLoader( u );
Object clsName = jLoader.loadClass( clsList.elementAt(i).toString() ).newInstance();
I get this error message.
java.lang.ClassNotFoundException: ExceptionTestCase
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:297)
at java.lang.ClassLoader.loadClass(ClassLoader.java:253)
// "file://" + fileLocation + fileName + "/" This works fine from a browser.
Is there anything I am missing? Thanks for the reply.

Loading images from a JAR

Hi,
My class is currently stored in a subdirectory of my JAR file, and in the directory with the class is a "textures" directory, containing all of my images.
When I run my class from the directory before I zip it up to be a JAR, it works fine. But, as soon as I run it as a JAR file, it crashes when loading the images.
Here's the code I'm using to load the images:
BufferedImage temp = null;
String path = this.getClass().getResource("textures/" + imagePath).toString();
temp = ImageIO.read(new File(new URI(path)));What am I doing wrong?
Thanks for any assistance! =)

Hiii bro ,
I think this will help u ,,,,,,,,
suppose you have a folder Image , under that folder there are some image files and you have a main class say TestMain.class .
In your main class(TestMain)
import javax.swing.ImageIcon;
Now write this code into your main class----------->
public ImageIcon customOpenIcon = new ImageIcon(TestMain.class.getResource("/image/expanded.gif"));Thanks,
sb

? SplashScreen - retrieving an image from a jar file ?

When you want to use the Java SplashScreen you provide a run flag of the form:
-splash:image.png
Is there a way to have the 'image.png' reference a file in one of the jar files?I don't believe the jar files are loaded by the time SplashScreen activates so that might be why I can't seem to be able to do it, but that was when I checked over a year ago ... have things changed?
Alternatively (and probably the preferred option for me) is there a way to tell the SplashScreen to create an empty splash so that one exists when I use the 'splash.setImageUrl()' method? Currently I have to set the splash image to be some empty/transparent image via:
-splash:empty.png
Then I set my own desired image via the 'splash.setImageUrl()' method...BUT, I still need to have the 'empty.png' file contained in the root folder of my project and this sucks. I'd like to be able to tell java that I want to create an empty splash, without having to provide an empty image, and then when the splash is created, I can use the image url method as normal to write my own image to the splash display.
thx.

morgalr, this is independent of code, it's just the splash screen that start up before any code runs so you could do this with any of your projects that you have.
You need to specify splash image via run command of:
-splash:image.png
so, if you have a jar file that has an image in it, and you place it on your classpath and then try to run your code with
-splash:package/path/image.png
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I guess what I would ultimately want would be to be able to create a SplashScreen instance through each program in my project without having to provide a runtime flag that only generates the instance if the provided image is available. If I it still provided a SplashScreen instance then I would be able to use the setImageUrl() method from code to provide the desired image. Also, it would be nice if the splashscreen remained some set time even after the application window popped up with an AWT/Swing event that now causes it to disappear instantly...but that one I can overcome with my own JWindow post-splash display that mimics the effect.
thanks.

How To Load Sound From Inside jar File?

Hello There
i've made a jar file that contains Images&Pictures But I Can't Use Them
So I Used For Loading Images
URL url = this.getClass().getResource("image.jpg");
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URL url = this.getClass().getResource("Bond2.wav");
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First_knight wrote:
and for loading sound when i use
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Loading classes from another jar file

I've set up my jnpl file so that it references a core jar file (contains main() function). The jnlp also references another jar file (app.jar) which contains class files that I load and instantiate dynamically (using ClassLoader). The core.jar file contains a manifest that includes a reference to app.jar.
The app works fine when I use "java -jar core.jar" from the command line.
However, when I wrap the jars using jnlp, I always get a null pointer exception because it cannot find any class that is in the app.jar file. I've tried different strategies, such as trying to load a class file that sits on the server (in a jar file and not in a jar file), but that also fails if I use jnlp (However, it works if I use "java -jar core.jar")
Any ideas what is going on?

This is the "OckCore.jar" manifest before signing:
Manifest-Version: 1.0
Main-Class: com.Ock.OckCore.OckApp
Class-Path: . OckMaths.jar
Created-By: 1.4.0-beta3 (Sun Microsystems Inc.)
Name: com.Ock.OckCore.OckApp.class
Java-Bean: FalseThis is the manifest after signing:
Manifest-Version: 1.0
Main-Class: com.Ock.OckCore.OckApp
Created-By: 1.4.0-beta3 (Sun Microsystems Inc.)
Class-Path: http://hazel/Ock/. http://hazel/Ock/OckMaths.jar
Name: com/Ock/OckCore/OckApp.class
SHA1-Digest: KRZmOryizx9o2L61nN+DbUYCgwo=I have removed a load of irrelevant stuff from the "after" manifest to keep it readable.
note that :-
The OckApp.class loads normally from webstart and tries to load a class from OckMaths.jar.
I can prove that OckApp.class does load because it creates a log file when it does.
The OckApp.class tries to load a class from the OckMaths.jar. This fails if webstart is used but works if OckCore is launched using "java -jar OckCore.jar".
The jars do exist at the location specified by the manifest.
The application launches normally if I use "java -Jar OckCore.jar"
Here is the jnlp file
<?xml version='1.0' encoding='UTF-8'?>
<jnlp
     spec="1.0"
     codebase="http://hazel/Ock"
     href="OckMaths.jnlp">
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          <description>Demo of a ported app running as a Java Webstart application</description>
          <description kind="short">An app running as a Java Webstart application"></description>
          <offline-allowed/>
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     <security>
          <all-permissions/>
     </security>
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     <application-desc main-class="com.Ock.OckCore.OckApp">
</jnlp> I have also signed the jars outside of a webdirectory. I get the following manifest file:
Manifest-Version: 1.0
Main-Class: com.Ock.OckCore.OckApp
Created-By: 1.4.0-beta3 (Sun Microsystems Inc.)
Class-Path: . OckMaths.jar
Name: com/Ock/OckCore/OckApp.class
SHA1-Digest: KRZmOryizx9o2L61nN+DbUYCgwo=
note that :-
The jars do exist at the location specified by the manifest.
The application launches normally if I use "java -Jar OckCore.jar".
The application doesn't launch from webstart.
I've found that cache, but the jar files have been renamed.
OckCore.jar is anOckCore.jar, etc... so I'm not sure if trying to write a cmdline will work anyway.

Load image from URL on file open, then embed image

I am trying to create a PDF form with an image field that is empty/blank by default. When the PDF is opened, I want it to load the image at C:\picture.jpg and embed that image in that document.
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TypeError: this.getField("userInfo") is null
2:XFA:topmostSubform[0]:Page1[0]:initialize
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I want to create a customized cursor, and I have a Microsoft cursor .CUR file. Can I load this .cur file as an image? - Thank you
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Hi,
I've been google-ing up-and-down, but couldn't find any implementation of .cur and Java. If anyone has done so, please post... I was looking for an easy way i.e. couple lines of code to load image from a .cur file .. like we do with gif or jpeg out of the box. The JIMI has an extensive support of many other formats, and it will be an alternative if the graphics department won't give us a new set of cursor images in gif/jpg format.
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Loading image from jars only once in oracle forms 10g

Hi,
I have an oracle forms 10g application which loads image from a jar. Every time i click on a button "A" that loads the image "image" on another button "B" in the same screen, a message is displayed in the java console "Loaded image: jar:https://+IP+/forms/java/+myjar+.jar!/image.gif". So after 10 clicks, i get the same message displayed 10 times. In the form, i've called:
SET_CUSTOM_PROPERTY(p_object_name, 1, 'IMAGE_NAME_ON', '/'||p_image_name);My question is the following:
- is there a way to load this image once and use it later without having to load it every time i clik on "A"? if yes, how?
P.S.: if this thread shouldn't be posted in this forum, please redirect me to the right one.
Thanks in advance

Ah okay.
I'm using the rolloverbutton.jar (RollOver Button PJC) [RolloverButton.java -> authors: Steve Button, Duncan Mills].
Here is the part concerning the IMAGE_NAME_ON function:
// make sure we are in rollover mode
enableRollover();
log("setProperty - IMAGE_NAME_ON value=" + value.toString());
// load the requested image
m_imageNameOn = (String) value;
loadImage(ON,m_imageNameOn);
// reset the currrently drawn image if needed
setImage(ON,m_state);
return true;where loadImage function is:
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Loading Resources from a .JAR

I've read through this forum and searched java.sun.com and have found nothing to solve my problem, although I see many other people are having the same problem.
I wrote a small application that needs to load a text file and images. When I just compile everything and then run it, all is well, my text file is found and my images are displayed. Now the problem is when I package everything into a .JAR file, suddenly my magic stops. Here is the directory structure
- State.class
FiftyStatesGame.class
FlagPanel.class
StatsPanel.class
StatePanel.class
states.txt
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/flags
a bunch of .gif images (50 total)
/states
a bunch of .gif images (50 total)
I create my archive with the following command
jar cvf FiftyStates.jar *
and all seems well, I've even changed the extension to .zip to ensure that the images and text file is inside the jar
Now when I try to run the program using
java -cp FiftyStates.jar FiftyStatesGame
the program starts but I get a NullPointerException and my pictures don't load. :-(
I've read in the forum about using
URL imageURL = ClassLoader.getSystemResource(<path to image>);
Image logo = Toolkit.getDefaultToolkit().getImage(imageURL);
and I tried this and once again, it works when not in jar form, but as soon as the application is JARed, I encounter the same problems.
Can anyone give me the answer to this crazy problem?
and I guess I should go one step further and ask, if I want to give this program to a friend with the JRE installed on a windows machine, what command should I put in my batch file to run this program on his machine?
javaw -cp FiftyStates.jar FiftyStatesGame
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Hi,
Getting the image
=================
It seems to me you can't be too far away from resolving your problem.
I've never actually tried to get an image from a jar file, so I'm guessing that this may not work for you, but I have unzipped a zip file contained within an executable jar.
What I did was this:
    private ZipInputStream findInstallationFile() {
        ClassLoader classLoader;
        URL url;
        ZipInputStream zipInputStream = null;
        InputStream inputStream;
        classLoader = getClass().getClassLoader();
        url = classLoader.getResource(ZIP_RESOURCE_NAME);
        if (url != null) {
            try {
                inputStream = url.openStream();
                zipInputStream = new ZipInputStream(inputStream);
            } catch (IOException ioe) {
                ioe.printStackTrace();
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Once you have the InputStream, you can just read the entire contents and do what you like with them.
Executable jars
===============
You can make it easier to run a jar file by including a manifest file. This is just a text file which should be in the META-INF directory in your jar file. The manifest file itself should be called Manifest.mf.
The contents of the Manifest should be:
Manifest-Version: 1.0
Main-Class: FiftyStatesGame
This assumes that your main class is FiftyStatesGame which is in the default package (tut, tut!).
Hope this helps!
Rhys

How do I store images in a jar file to be displayed on a jsp?

Afternoon all,
I have created a java component which accepts some parameters and returns a string. The returned string contains html tags to display a table in a webpage when rendered through a browser.
I want to be able to add this component to any java web project to display my table. The problem is that I want to use images in my table to give the appearance of curved corners.
How do I store images in my component and render to a webpage?
Thanks in advance,
Alex

You won't be able to make the install of this library as simple as the installation of a jar file. You can't access the images directly in the jar.
There are a few approaches you can take:
1 - jar file + resources:
Have the install as being a jar and a "resources" directory which you store all the images in. Thus the images become part of the web application/web site and are accessible. Probably need to allow an entry in web.xml to configure where/what this directory is called.
2 - jar file only:
Provide a servlet to access the images, which will load them from the jar file, using the ClassLoader.getResourceAsStream(). Requires declaration of a servlet in the web.xml file. Won't be as efficient as having the images on disk, but will keep them bundled in the jar file.
you would generate code such as <img src="myImgServlet?img=.....">
Cheers,
evnafets

Problem loading image from jar file referenced by jar file

First, I searched this one and no, I didn't find an answer. Loading images from jar files has been pretty much done to death but my problem is different. Please read on.
I have my application, a straight up executable running from Eclipse. It uses a jar file, call it JarA. JarA launches a GUI that is located in another jar file. Call it JarB. To recap:
My application calls JarA -> JarA loads classes from JarB -> JarB looks for images to place in a GUI it wants to show on the screen
When JarB goes to load an image the following happens:
java.lang.NullPointerException
     at sun.misc.URLClassPath$3.run(URLClassPath.java:316)
     at java.security.AccessController.doPrivileged(Native Method)
     at sun.misc.URLClassPath.getLoader(URLClassPath.java:313)
     at sun.misc.URLClassPath.getLoader(URLClassPath.java:290)
     at sun.misc.URLClassPath.findResource(URLClassPath.java:141)
     at java.net.URLClassLoader$2.run(URLClassLoader.java:362)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.net.URLClassLoader.findResource(URLClassLoader.java:359)
     at java.lang.ClassLoader.getResource(ClassLoader.java:977)
     at org.cubrc.gmshell.gui.MainWin.preInit(MainWin.java:152)
     at org.cubrc.gmshell.gui.MainWin.<init>(MainWin.java:135)
The code from JarB that loads the image looks like this:
          URL[] oSearch = {Main.class.getResource("images/")};
          URLClassLoader oLoader = new URLClassLoader(oSearch);
          imgIcon = new ImageIcon(oLoader.getResource("icon.gif"));
          imgMatchRunning = new ImageIcon(oLoader.getResource("gears.gif"));
          imgMatchStill = new ImageIcon(oLoader.getResource("gears-still.gif"));
          imgMagnify = new ImageIcon(oLoader.getResource("magnify.gif"));This looks right to me and JarB certainly has an images directory with those files. But I'm in hell right now because I don't know where to place the images to make this work or if you can even attempt to load images with a dependency chain like this.
Any help very appreciated!

Have you tried to move your image-files out of the jar file and place them in the sam folder as the jar-file? I think that would help.
When you try to load the image-file you get the NullPointerException because the program tries to read a file it can't find. Remember that a jar file IS a file and not a directory.
If you want to read somthing inside the jar-file you need to encode it first.
Have you tried to read the jar-file with winRar. It makes it easy to add and remove files in your jar-file.

Loading images from a jar file

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