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So lets say I have JAR file. User creates some text file and wants to save it. I would like to save it in "resources" folder in my JAR so user can read it later.

But how do I get path to this folder?

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    It's generally a bad idea to try to manipulate a JAR file while your program is running from that JAR file. It sounds like you have an X-Y Problem -- could you explain more about what your actual problem is, and why you think this is the right way to solve it? Commented Mar 2, 2013 at 22:39
  • I just want to SAVE TEXT FILE to JAR folder. How to do this? Commented Mar 2, 2013 at 22:39
  • The answer to "how to do this?" depends on why you want to do this. Re-stating the question as "I just want to do X" doesn't help. Commented Mar 2, 2013 at 22:42
  • possible duplicate of How can a Java program use files inside the .jar for read and write? Commented Mar 3, 2013 at 0:28

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You usually wouldn't do this. Updating a zip file (which is what a jar file is, basically) is non-trivial. Jar files aren't designed to be updated with user content (e.g. their "documents" directory, or an application-specific directory). You should store your user's files in an appropriate directory. (Heck, in many operating systems the program files are installed read only anyway...)

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But how can I know where to create such folder? In windows I could create it in Program Files but Linux doesnt have such directory. Where to store those files?
@user2102972: No, you shouldn't put it in Program Files in Windows! That's for programs - this is for user content. Ask the user, possibly starting off with their home directory.
The default directory were user-created documents should be stored is a complicated question with a long answer. However, as a minimal effort, you can use Paths.get(System.getProperty("user.home"), "Documents").
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Not sure if it is a good idea but it is possible from command line (jar command help):

jar cf myfile.jar dir1/file1.ext1 ;# create jar file and store file1 jar uf myfile.jar dir2/file2.ext2 ;# update jar file with file2

What is possible from command line should be possible thru the Jar Java API

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Will the jar command work if the JAR is opened for reading by the JVM? (Also, instead of a command-line solution, there is the JarFile class in the standard library.)
@DanielPryden - it will certainly happily write to the file, and reading JVM will most probably not like it

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