如何正确地将Java项目导出为可运行的jar？

Question

I'm trying to learn RMI API in java. Everything finally seems to be working; My server is up and running, my client can connect. But when I export the project, from Eclipse, as a runnable jar with the Client as launch configuration, now this jar can't connect to my running server. I get an AccessControlException .

    if (System.getSecurityManager() == null) {
        System.setProperty("java.security.policy", "src/mySecurity");
        System.setSecurityManager(new SecurityManager());
    }

Both the client and server has these as the first lines in their main methods. So I think they can't find the 'mySecurity' file after I've exported the project as a jar? What can I do?

EDIT: When I access .png files in my projects, I do this MyClass.class.getResource("/resources/myImage.png") That works fine when exported as a jar. But as I understand it, only .java files are supposed to go in the src folder of my project? But whatever is outside the src folder is not included in the jar file. (note that myImage.png is located in src).

So currently I export the jar and place it in a folder with a resources folder in it(which I copied from my IDE workspace). Is this the way I'm supposed to do it, or can I in fact export my project as a executable jar with access resources on the same level with src?

Answer 1

Run your JVMs with

-Djava.security.debug=access,failure,policy

The policy part shows you exactly what policy files are being loaded. The rest helps debug all AccessControlExceptions and their causes, and shows the protection domains that are in effect at each one, and the associated policy file in each case.