如何创建指向jar文件的可执行链接？

Question

I'm developing a Java GUI-less application and I need to test its behavior running multiple instances of it at the same time.

I created this folder structure

Testing
  ├──> Instance1
  │      ├──> App.jar
  │      └──> cfg.properties
  ├──> Instance2
  │      ├──> App.jar
  │      └──> cfg.properties
  ├──> Instance3
  │      ├──> App.jar
  │      └──> cfg.properties
  └──> Instance4
         ├──> App.jar
         └──> cfg.properties

The cfg.properties file is different for each folder, but the App.jar files are just copies of the .jar generated by the IDE. The problem with this is I need to manually replace each .jar, each time I make any change to the original.

Is there any way to have something like a link to the original .jar file instead of real copies of it, so all of them auto update each time I change the original one? (A solution in Windows would be great, but any Linux trick would also work for me)

Answer 1

you can move App.jar into new folder and specify app.jar path in classpath java argument

Testing
  ├──> Jar
  │      ├──> App.jar
  ├──> Instance1
  │      └──> cfg.properties
  ├──> Instance2
  │      └──> cfg.properties
  ├──> Instance3
  │      └──> cfg.properties
  └──> Instance4
         └──> cfg.properties

Test instance 1

    cd  Testing/Instance1
    java -jar -cp ../Jar/App.jar 

in this way you don't need a jar in each instance folder