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Java is a cross-platform language and environment. However, the Java VM itself needs to communicate with the native processor, operating system, and file system. If native code is to be avoided, everything you'd rely on the OS for in a classic program has to be provided by Java instead. Reimplementing a complete virtual OS and API takes a while. In Java's case, and specifically in the case of the file system, the job has taken over a decade; and it still isn't done. Nonetheless, Java 7 may finally finish some of the last abstractions needed to create filesystem-aware programs with all the power of their native counterparts.