zip, deleting an uneeded file from within the.
#HOW TO OPEN OSBOT JAR FILE ZIP#
zip file, being sure that the META-INF folder is in the top-level. zip, extract the files, and recreate the. Remove the extra byte at the end of the file (with a hex-editor or a command like head -c -1 myjar.jar), and then execute the jar by double-clicking or with java -jar myfile.jar as normal.jar as the classpath and name of the main class at the command prompt Use prayagubd's approach and specify the.With such files, there are a variety solutions to run the file: I use an online upload system that automatically adds a single extra LF character ('\n', 0x0a) to the end of every jar file. If the jar file has any extra bytes at the end, explorers like 7-Zip can open it, but it will be treated as corrupt. If you can work out if this bug exists in the your (or my) version of the Java SE you have more patience that me. Parsing of the Meta-inf file has been an issue that has come-up, been fixed and then come-up again for sun. With more investigation I'm sure I could have got the dynamic meta-file creation working with Ant as I know other people do - there must be some peculiarity in the combination of my ant version (1.6.2), java version (1.4.2_07) and perhaps the current phase of the moon. Using the ant task to create the manifest file on-the-fly gives you and entry like: Manifest-Version: 1.0Ĭreated-By: 1.4.2_07-b05 (Sun Microsystems Inc.)Ĭreating the manifest file myself, with the bare essentials fixes the issue: Manifest-Version: 1.0 This is the common issue with "manifest" in the error? Yes it happens a lot, here's a link: |-myJAR (creates another directory making the file corrupted)**
When you use a zip tool to unpack, change files and zip again, normally the JAR structure changes to this structure which is incorrect, since another directory level is added on the top of the file system making it a corrupted file as is shown below: **myJAR (Main-Directory) Once you're done try execute it on the command line using: java -jar myJAR.jar If your JAR complies with these rules it will work doesn't matter if you build it manually by using a ZIP tool and then you changed the extension back to. |-MainClass.class (must to implement the main method, mandatory) |-MANIFEST.MF (Mandatory Main-class: com.MainClass) The problem occurs when you zip back the folder.Ī valid Runnable/Executable JAR has the next structure: myJAR (Main-Directory) This regularly occurs when you change the extension on the JAR for ZIP, extract the zip content and make some modifications on files such as changing the MANIFEST.MF file which is a very common case, many times Eclipse doesn't generate the MANIFEST file as we want, or maybe we would like to modify the CLASS-PATH or the MAIN-CLASS values of it.
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