Java Jar file: use resource errors: URI is not hierarchical
deployment, executable-jar, java, resources
Solution
You cannot do this
File src = new File(resourceUrl.toURI()); //ERROR HERE
it is not a file! When you run from the ide you don't have any error, because you don't run a jar file. In the IDE classes and resources are extracted on the file system.
But you can open an `InputStream` in this way:
InputStream in = Model.class.getClassLoader().getResourceAsStream("/data.sav");
Remove `"/resource"`. Generally the IDEs separates on file system classes and resources. But when the jar is created they are put all together. So the folder level `"/resource"` is used only for classes and resources separation.
When you get a resource from classloader you have to specify the path that the resource has inside the jar, that is the real package hierarchy.
Problem
I have deployed my app to jar file. When I need to copy data from one file of resource to outside of jar file, I do this code: ``` URL resourceUrl = getClass().getResource("/resource/data.sav"); File src = new File(resourceUrl.toURI()); //ERROR HERE File dst = new File(CurrentPath()+"data.sav"); //CurrentPath: path of jar file don't include jar file name FileInputStream in = new FileInputStream(src); FileOutputStream out = new FileOutputStream(dst); // some excute code here ``` The error I have met is: `URI is not hierarchical`. this error I don't meet when run in IDE. If I change above code as some help on other post on StackOverFlow: ``` InputStream in = Model.class.getClassLoader().getResourceAsStream("/resource/data.sav"); File dst = new File(CurrentPath() + "data.sav"); FileOutputStream out = new FileOutputStream(dst); //.... byte[] buf = new byte[1024]; int len; while ((len = in.read(buf)) > 0) { //NULL POINTER EXCEPTION //.... } ```