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.

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Problem loading images from a return value of a function

hello, I write because I uin problem in loading images from a return value of a function.
I created a database with a field "image" of type string, where I put the physical address of the image. I have written like this: {__DIR__ }foto.jpg
Place the code, so you understand better
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lass.forName(driverName);
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First I connect to the database, run the query and I take the contents of the image.
Can anyone help me?
Is right to put in the database {__DIR__} foto.jpg or do I put only foto.jpg?

Hello unkus_nob,
I would rather suggest you to save only filename of that image like "foto.jpg" in database. And just concat it with the String variable containing "{__DIR__}".
Actually the javafx compiler converts the {__DIR__} to the existing class directory path something like : "jar:file:/..../".
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Problem loading image (from JAR)

Hi
I was wondering why this code works when running the app in my IDE, but not once exported in a JAR file:
public static BufferedImage loadDefaultCover()
          try
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NOTE 2: It works when I have a folder named images (with the image in it) next to the JAR.
NOTE 3: I tried:
return ImageIO.read(new File("images/default.png"));
return ImageIO.read(new File("/images/default.png"));Any ideas? Thanks!
Andrew
Edited by: Andrew_ on Jan 4, 2009 12:45 PM

You can't use File references to access resources in a jar file (technically, they are not presen in the file system but part of a zip file). Instead, you can load those resources via the classloader:
return ImageIO.read(getClass().getClassLoader().getResourceAsStream("images/default.png"));

Please have a look at this, problem loading images from jar.

I made a post at the wrong place..
Pleae have a look at it:
http://forum.java.sun.com/thread.jsp?forum=422&thread=434524&tstart=0&trange=15

Answer (hopefully not totally useless) posted over there.

Problem loading image from HTTPS

I am having trouble loading an image in Java client , the image is coming from a secure server.
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try
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if (image == null)
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try
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System.err.println("Interrupted Exception");
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System.err.println("Error loading the image");
Initialy I got MalformedURLException but then I switched to jdk1.4.2 and set the following system property and got passed that part but now I am getting error when MediaTracker tries to load the image.
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Have you tried using the HttpsURLConnection class introduced in JDK 1.4?

IOException: Problem loading image

Hi foreros
What could be the reason behind an error like this IOException: Problem loading image except it cannot find the jar path for the images?
Regards
Tizha

Without more information, I'd say there's not enough available RAM to load the image.

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())
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InputStream inputstream = jf.getInputStream(jf.getEntry(fileName));
buffer = new byte[inputstream.available()];
inputstream.read(buffer);
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tracker.addImage(currentIm, 0);
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}//try
catch(Exception e)
e.printStackTrace();
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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.

PJC - Loading Images from JAR Files

I'm developing a PJC class that involves loading images. I would like to be able to find and use an image contained in a JAR file just like the built-in Forms items do; not the JAR file where my class is contained but any external ones defined in the server archive settings.
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Is there a VButton method or an Oracle loader class for finding image resources from the defined JAR archives? If not, could someone supply some code for achieving this.
Thank you.

Hi,
the jar file name the images are in shouldn't matter for the code as long as the package name is preserved. If you want to see it with your own eyes, do the following
1. Back up demo90.jar
2. Create a copy of it and call it demo90img.jar
3. Open demo90.jar in winzip and remove all images
4. Open demo90img.jar and remove all Java classes
5. add ,/forms90demo/jars/demo90img.jar to the archive_jini tag of a demo you want to test this on
6. Run the application and see the images despite the fact they are now in a separate jar file. Note in the Jinitiator console that the new jar files are downloaded and replace the existing, cached, jars
7. Run an application that doesn't have demo90img.jar configured to see that the images are missing.
Frank

How to load images from css file in JavaFX 8

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In Java 7_25 this code works as expected but in JavaFX 8 b99 I get this error:
ava.lang.NullPointerException
at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:1129)
at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:1598)
at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1520)
at com.sun.javafx.sg.prism.NGGroup.renderChildren(NGGroup.java:233)
at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:199)
at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:1249)
at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:1598)
at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1520)
at com.sun.javafx.sg.prism.NGGroup.renderChildren(NGGroup.java:233)
at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:199)
at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:1249)
at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:1598)
at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1520)
at com.sun.javafx.tk.quantum.ViewPainter.doPaint(ViewPainter.java:99)
at com.sun.javafx.tk.quantum.AbstractPainter.paintImpl(AbstractPainter.java:210)
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at com.sun.javafx.tk.RenderJob.run(RenderJob.java:58)
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at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
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D3D Vram Pool: 13,331,480 used (5.0%), 13,331,480 managed (5.0%), 268,435,456 total
20 total resources being managed
4 permanent resources (20.0%)
1 resources locked (5.0%)
7 resources contain interesting data (35.0%)
0 resources disappeared (0.0%)
D3D Vram Pool: 13,331,480 used (5.0%), 13,331,480 managed (5.0%), 268,435,456 total
20 total resources being managed
4 permanent resources (20.0%)
1 resources locked (5.0%)
7 resources contain interesting data (35.0%)
0 resources disappeared (0.0%)
D3D Vram Pool: 13,331,480 used (5.0%), 13,331,480 managed (5.0%), 268,435,456 total
20 total resources being managed
4 permanent resources (20.0%)
1 resources locked (5.0%)
7 resources contain interesting data (35.0%)
0 resources disappeared (0.0%)
What is the proper way to load images from css in Java 8?
Ref
How to load images from css file in JavaFX 8 - Stack Overflow

There is nothing special to do - you execute the statement from your program just like any other SQL statement. The only thing to be aware of are the privilege/permission issues:
When loading from a file on a client computer:
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Read privileges are required on the directory being read from.
The allow_read_client_file database option must be enabled.
The read_client_file secure feature must be enabled.
Revoking these privileges is also the only way you can prevent a user from executing the statement.

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Hi all,
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Edited by: trangkd on Aug 9, 2011 3:08 PM

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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Ah okay.
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but instead the small square placeholders for the characters are
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hi, Guys:
I need to load thumbnail images from BLOB to multiple markers' infowindow in Google map . I have implemented Google map in APEX. I load the data suchas text for every marker's infowindow from Oracle database table with PL/JSON, and infowindow works fine. Could anyone give me a suggestion or example so I know how to load images to javascript?
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lxiscas wrote:
hi, VC:
Thanks for your kind reply. I need to render these images out of APEX session, actually in javascript that is related to Google map markers' infowindow.
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Basically what this api does is generates a kind of url to each blob in the database, not sure how google api's deal with this though. Why don't you give it a try?
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See this tutorial http://docs.oracle.com/cd/E14373_01/appdev.32/e13363/up_dn_files.htm
I did not find any method in PL/JSON to pass image object)? So far I only found example to load images from local files to javascript.Hmm..I don't think you should load image objects.
Vikram

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Hi,
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I've used:
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Hello everyone,
Please can someone help me as i am stuck.
I am trying to research loading images from a folder called /images/unknown (unknown is a customer number and is stored in a variable called customerNo).
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Welcome to the Sun forums.
irknappers wrote:
...Please can someone help me as i am stuck.You might want to be more exact in future, about what you are stuck on.
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import java.io.FileFilter;
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    public static void main(String[] args) {
        String[] suffixes = ImageIO.getReaderFileSuffixes();
        FileFilter fileFilter = new FileFilterType(suffixes);
        File directory = null;
        if (args.length==1) {
            directory = new File( args[0] );
        } else {
            JFileChooser fileChooser = new JFileChooser();
            fileChooser.setFileSelectionMode( JFileChooser.DIRECTORIES_ONLY );
            int result = fileChooser.showOpenDialog( null );
            if ( result == JFileChooser.APPROVE_OPTION ) {
                directory = fileChooser.getSelectedFile();
            } else {
                System.err.println("Must select a directory to proceed, exiting.");
        File[] images = directory.listFiles( fileFilter );
        for (File file : images) {
            System.out.println(file);
        System.out.println( "The rest is left an exercise for the reader. ;-)" );
class FileFilterType implements FileFilter {
    String[] types;
    FileFilterType(String[] types) {
        this.types = types;
    public boolean accept(File file) {
        for (String type : types) {
            if ( file.getName().toLowerCase().endsWith( type.toLowerCase() ) ) {
                return true;
        return false;
}

Problem loading image from jar file referenced by jar file

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