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Java Forum / First Aid / May 2008images and jar file craziness
I've got an app that uses images that will be used with a JToggleButton. I started out with Icon myIcon = new ImageIcon("images\\myImage.jpg"); Now I want to wrap all of it up in an executable jar file. I've done a ton of research, visited and revisited Roedy's site, and nothing I've tried seems to work. I've tried using the Toolkit, URL's, etc.. The jar will run, but it will only read the images from hard drive, not from within the jar file. So if I move the jar file, I get no images. I've also tried getClass().getResource() and the jar file won't even open BTW, the class that needs the Icon's is a subclass of JPanel. Any other ideas? TIA > I've got an app that uses images that will be used with a > JToggleButton. I started out with > Icon myIcon = new ImageIcon("images\\myImage.jpg"); Use forward slashes, and newImageIcon( getClass().getResource( "images/myImage.jpg" )); > I've also tried > getClass().getResource() and the jar file won't even open What do you mean the "jar [sic] file won't open"? Are you trying to open the JAR file? You should be opening the image file. You say you're using the method, but you don't show us *how* you're using it. The problem is in how you're using the method. To give help, we must have enough information. <http://sscce.org/>  SignatureLew > > I've got an app that uses images that will be used with a > > JToggleButton. I started out with [quoted text clipped - 17 lines] > -- > Lew What I mean when I say that the jar file won't open is that when I double-click on it, it will not execute. I always make sure that the program runs BEFORE I jar it all up. But I can't get things to run properly - and sometimes not at all - from the jar. For example, when I use the following line, the program runs fine when the images folder is in the same folder as the jar file. But when I move the jar file, it opens, but doesn't have the image. That tells me that it is NOT reading from the image folder inside the jar. myCardBack = new ImageIcon("images/background.jpg"); When I change it to myCardBack = new ImageIcon(getClass().getResource("images/ background.jpg")); The jar file won't even execute. Actually, I suspect that it may execute, but is hanging up somewhere before anything becomes visible. My suspicion is based on the fact that I can't delete the jar file. I get an error indicating that it is "in use". Again, the program runs fine when it is NOT jarred. I've also tried myCardBack = new ImageIcon(Toolkit.getDefaultToolkit().getImage("images/ background.jpg")); Same result - the jar file either will not execute or is hanging up somewhere. Program works fine un-jarred. >> > I've got an app that uses images that will be used with a >> > JToggleButton. I started out with [quoted text clipped - 28 lines] > me that it is NOT reading from the image folder inside the jar. > myCardBack = new ImageIcon("images/background.jpg"); No, that won't load from the jar. It is explicitly loading a file called images/background.jpg relative to the current directory in the filesystem, not the jar. > When I change it to > myCardBack = new ImageIcon(getClass().getResource("images/ [quoted text clipped - 4 lines] > get an error indicating that it is "in use". Again, the program runs > fine when it is NOT jarred. What is most likely happening is that your jar is crashing due to throwing an uncaught NPE. If the image cannot be loaded myCardBack will be null. Don't forget that "images/" is *relative* to whatever getClass() returns. This is the current class and so the images directory it tries to locate will be in the directory from which the current class file was loaded. If you want a top-level images directory, at the root of the jar, then use an absolute file path "/images" rather than a relative one. > I've also tried > myCardBack = new > ImageIcon(Toolkit.getDefaultToolkit().getImage("images/ > background.jpg")); > Same result - the jar file either will not execute or is hanging up > somewhere. Program works fine un-jarred. SignatureNigel Wade > Don't forget that "images/" is *relative* to whatever getClass() returns. This > is the current class and so the images directory it tries to locate will be in > the directory from which the current class file was loaded. If you want a > top-level images directory, at the root of the jar, then use an absolute file > path "/images" rather than a relative one. That did the trick!!! Thanks!!! On May 6, 1:54 pm, cowde...@district87.org wrote: > > Don't forget that "images/" is *relative* to whatever getClass() returns. This > > is the current class and so the images directory it tries to locate will be in [quoted text clipped - 5 lines] > > Thanks!!! PS. I'm still "Redbeard", the OP. The address is different because I forgot that I was already logged in to Google using my "work" ID. Sorry for any confusion! >What I mean when I say that the jar file won't open is that when I >double-click on it, it will not execute. I always make sure that the >program runs BEFORE I jar it all up. But I can't get things to run >properly - and sometimes not at all - from the jar. Learn to partition your problems. Tackle a simpler program first to learn how to get double click working. http://mindprod.com/jgloss/jar.html#ASSOCIATION SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com On May 6, 11:35 am, Roedy Green <see_webs...@mindprod.com.invalid> wrote: > On Tue, 6 May 2008 06:03:56 -0700 (PDT), cowde...@district87.org > wrote, quoted or indirectly quoted someone who said : [quoted text clipped - 12 lines] > Roedy Green Canadian Mind Products > The Java Glossaryhttp://mindprod.com While I'm certainly no expert, I'm also not a novice. I've written several apps and gotten them to work in a jar, but none had images in them. And I can get this app to run from the jar (depending on what code I have used), but I can't get the images to work. I'll try what you and Nigel have suggested to see if that helps. Thanks! >While I'm certainly no expert, I'm also not a novice. I've written >several apps and gotten them to work in a jar, but none had images in >them. And I can get this app to run from the jar (depending on what >code I have used), but I can't get the images to work. I understood from you earlier post you could not get a jar to execute at all. Apparently it executed but crapped out as soon as it came time to deal with the image. SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com On May 6, 11:02 pm, Roedy Green <see_webs...@mindprod.com.invalid> wrote: > On Tue, 6 May 2008 11:41:07 -0700 (PDT), cowde...@district87.org > wrote, quoted or indirectly quoted someone who said : [quoted text clipped - 11 lines] > Roedy Green Canadian Mind Products > The Java Glossaryhttp://mindprod.com Sorry for the confusion. Apparently, I wasn't as clear as I thought I was. Before I posted, I had researched and tried a variety of different ways to load the images. They all worked from the class files, but none would load the images once I jarred everything up. Most of the time the jar file would execute, but not have images. However, SOME techniques actually kept the jar file from executing - or more likely - caused it to hang before anything became visible. I was sure I was making some small mistake that I just couldn't see - which is why I posted. I see now that my problem was that I was using the relative path rather than the absolute path. Obviously, I have more to learn about that. I'd read about absolute vs. relative paths and thought that relative was the way to go. On Wed, 7 May 2008 18:54:36 -0700 (PDT), Redbeard <tom.cowdery@bigfoot.com> wrote, quoted or indirectly quoted someone who said : >I was sure I was making some small mistake that I just couldn't see - >which is why I posted. I see now that my problem was that I was using >the relative path rather than the absolute path. Obviously, I have >more to learn about that. I'd read about absolute vs. relative paths >and thought that relative was the way to go. To get at resources inside the jar you use either the resource name prefixed by the package or without where the package is implied by the package of the calling class. I explain this at http://mindprod.com/jgloss/resource.html SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com > On May 6, 11:02 pm, Roedy Green <see_webs...@mindprod.com.invalid> > wrote: [quoted text clipped - 29 lines] > more to learn about that. I'd read about absolute vs. relative paths > and thought that relative was the way to go. It's not that you were using a relative path, relative paths are perfectly ok and it may be argued that they are the preferred method. The problem is most likely that you were using the wrong relative path. There is only one absolute path, and that path is independent of the object you use as the basis of the getClass().getResource(). There are a large number of relative paths you might use, and each is dependent on where you base the relative path. For a relative path the origin is the directory containing the class which is returned by getClass(). You need to base your relative path in getResource() from that directory. Don't forget that the jar has a directory structure based on the package structure of the class definitions. SignatureNigel Wade > > On May 6, 11:02 pm, Roedy Green <see_webs...@mindprod.com.invalid> > > wrote: [quoted text clipped - 44 lines] > -- > Nigel Wade In my case, I only had three files, so I hadn't bothered to create a package. I have used packages in other projects, but primarily when creating libraries for use by others, not is a small project like this. My source code and compiled files all ended up in the same folder (directory) G:\Javasource\MemoryGame and the images were in G: \Javasource\MemoryGame\images. Do you have to use packages to get a relative path to work? > In my case, I only had three files, so I hadn't bothered to create a > package. I have used packages in other projects, but primarily when [quoted text clipped - 4 lines] > > Do you have to use packages to get a relative path to work? Give it a try and see. SignatureLew On Mon, 5 May 2008 20:01:07 -0700 (PDT), Redbeard <tom.cowdery@bigfoot.com> wrote, quoted or indirectly quoted someone who said : >Now I want to wrap all of it up in an executable jar file. I've done >a ton of research, visited and revisited Roedy's site, and nothing >I've tried seems to work. see http://mindprod.com/jgloss/image.html http://mindprod.com/jgloss/resource.html http://mindprod.com/jgloss/imageicon.html Just take the sample code under ImageIcon and prove to yourself it works. The main trick is building the jar properly so that you have an image in the jar named: com/mindprod/example/raspberry.png see http://mindprod.com/jgloss/jar.html Then with that under your belt, I think you should have no trouble getting it to work in your own program. SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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