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Java Forum / General / November 2007SplashScreen-Image and Libraries
I am trying to use the SplashScreen feature in Java 6, and it works when I use the -splash parameter passed to the JVM. However, when I try to use the MANIFEST file, it doesn't seem to work correctly. I think this has to do with the fact that the image I am trying to access is within another directory (it's specifically in a library that has been included in the project's classpath). Here is my MANIFEST file: Manifest-Version: 1.0 Main-Class: myproject.Main SplashScreen-Image: "resources/icons/misc_icons/Title Screen.png" Class-Path: lib/Project_Resources.jar resources/icons/misc_icons/Title Screen.png is found within the Project_Resources.jar. I have tried moving the Class-Path variable before SplashScreen-Image but that does not seem to help the problem. Does anybody have any suggestions? Thanks > I am trying to use the SplashScreen feature in Java 6, and it works > when I use the -splash parameter passed to the JVM. However, when I [quoted text clipped - 14 lines] > > Does anybody have any suggestions? Thanks How can you have a Class-Path: of lib/Project_Resources.jar? Is lib in the project jar? I don't think you can do that. Of course I could be totally confused :-).  SignatureKnute Johnson email s/nospam/knute/ On Nov 27, 10:59 pm, Knute Johnson <nos...@rabbitbrush.frazmtn.com> wrote: > > I am trying to use the SplashScreen feature in Java 6, and it works > > when I use the -splash parameter passed to the JVM. However, when I [quoted text clipped - 23 lines] > Knute Johnson > email s/nospam/knute/ Ah, yes.../lib is contained within the project JAR. Something like this... Project.jar - compiled.code.packages.and.stuff - lib - Project_Resources.jar There is a configuration file, as well as a C++ launcher to read that configuration file outside of the Project.jar. The C++ launcher was created so a splash screen could be shown, but now that Java does it, I think I can get rid of the C++ launcher if I can figure out this problem. >>> MANIFEST file: ... >>> Class-Path: lib/Project_Resources.jar Knute Johnson wrote: >> How can you have a Class-Path: of lib/Project_Resources.jar? Is lib in >> the project jar? I don't think you can do that. Of course I could be >> totally confused :-). The manifest Class-Path entry refers to a JAR on the local (i.e., deployment) platform, not within the JAR whose manifest this is. In other words, the referenced JAR is external to the referencing JAR. > Ah, yes.../lib is contained within the project JAR. The manifest file's Class-Path entry does not refer to directories within the JAR. <http://java.sun.com/docs/books/tutorial/deployment/jar/downman.html> > Note : The Class-Path header points to classes or JAR files on the local network, > not JAR files within the JAR file or classes accessible over internet protocols. [quoted text clipped - 3 lines] > you cannot use the Class-Path header in MyJar.jar's manifest to load classes > in MyUtils.jar into the class path. SignatureLew > >>> MANIFEST file: > ... [quoted text clipped - 24 lines] > -- > Lew Wow. I can't believe I made that beginner mistake (already knew that too - /lib/Project_Resources.jar exists outside my Project.jar). Anyway, it seems like from Owen's response, there's no way for the classloader to know about files in other JARs, so I have to put the splashscreen image within my main JAR file. Alright, thanks for the help everybody. > On Nov 27, 10:59 pm, Knute Johnson <nos...@rabbitbrush.frazmtn.com> > wrote: [quoted text clipped - 39 lines] > I think I can get rid of the C++ launcher if I can figure out this > problem. The built-in classloaders in general can't look inside JARs that are inside JARs. Your Class-Path attribute instead specifies Project_Resources.jar in the directory lib in the same directory the Project.jar is in, like so: foo/ foo/Project.jar foo/lib/ foo/lib/Project_Resources.jar It's not terribly hard to write your own classloader that can look inside a JAR for JARs, but it won't be availalble until after the splashscreen-displaying code in the JRE has already run. You'll have to restructure your packaging to use the built-in splash screen. -O 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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