How do I delete executable JAR after running it inside Java program?

Question

I am using a Java program to download JARs from a private online database, and then run them using the following code:

ProcessBuilder pb = new ProcessBuilder(commands);
File jarFile = new File(JAR_DIR);
pb.directory(jarFile);
Process proc = pb.start();

The JARs run fine using this, but I would like to delete each JAR after using it because there are a ton of them and it would require too much space to just continue downloading them.

I have been printing out each line in the JAR and then waiting for it to close (I have also tried destroying the process after waiting for it to close):

BufferedReader r = new BufferedReader(new InputStreamReader(proc.getInputStream()));
String line;
while(line = r.readLine()) != null)
    System.out.println(line);
proc.waitFor();

Then I delete the folder where the JAR is located using a method from org.apache.commons.io.FileUtils:

FileUtils.deleteDirectory(new File(jarDirectory));

However, this throws an Exception saying the JAR file can't be deleted.

I think there's somewhere I need to remove the JAR's path from the JVM before deleting it, but I haven't found anything on how to do this inside another Java Program.

Answer 1

等待大神答复