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I have a bunch of iReport source code (jrxml) locate inside the workspace with the following path: <project>/report/<jrxml_file> When I pack my source code into jar file. I will have this file structure directory: <jar_file>/report/<jrxml_file> In my source code, I have these code to validate the existence of the jrxml file: File file = new File("report/jrxml_file"); if (!file.exists()) { return false; } When I execute this jar file through the command: java -jar MyJar.jar I hit an error mention that the particular jrxml_file doesn't exists. My doubt: I am just curious to know whether am I allow to read the jrxml_file which is locate inside MyJar.jar? Do I need to extract the jrxml_file to a physical directory before I can read it? THanks @!