Question

I have a jar or war.

I’m programmaticaly reading this jar, and when I find jar inside this jar I’d like to programmaticaly read it again.

But JarFile provides only getInputStream, which I cannot pass to JarFile(File file) constructor.

How to read jar from jar?

EDIT: I was thinking about getting the File somehow from classloader or so.

Answer 1

you can create jar file in File System, something like

 File tempFile=TempFile.createFile("newJar",".jar");

and write Stream into it. After that you can construct your JarFile(tempFile) and handle it…

Forget about it if program is running as unsigned applet/JNLP since you will not have right to create file in file system…