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Editorial Team
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Asked: 2026-05-21T03:16:04+00:00

For my usecase, I would like to have an in memory directory to store

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For my usecase, I would like to have an in memory directory to store some files for a very short time. Actually I compile source code to .class files at runtime, classload and execute them. The clean way would be to create a virtual directory and let the compiler create .class files there. Of course I could use a temp directory, but I have to clean it before compiling, I don’t know if I’m the only one using it, etc.

So, is and how is it possible to create a virtual, in the meaning of in memory, directory in Java?

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1 Answer

  1. Editorial Team

    In Java 6 it is not really possible to do this kind of thing within a Java application. You need to rely on the OS platform to provide the the pseudo-filesystem.

    In Java 7, the NIO APIs have been extended to provide an API that allows you to define new file systems; see FileSystemProvider.

    Apache Commons VFS is another option, but it has a couple of characteristics that may cause problems for existing code and (3rd-party) libraries:

    • Files and directories in VFS are named using urls, not File objects. So code that uses File for file manipulation won’t work.

    • FileInputStream, FileOutputStream, FileReader and FileWriter won’t work with VFS for much the same reason.

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