Java native runtime (jnr) is a collection of java libraries to make interfacing with os-level features easier. jnr uses an alternate method to jni or jna to achieve programming simplicity while still retaining performance.

the jnr-enxio package mimcs the standard java non-blocking i/o (nio) library by implementing an i/o backend based on calls to the underlying native os-level functions. this is implementing using the jnr-ffi foreign function interface.