Packaging a Native Library into a Jar

I have written a Java Native Interface (JNI) that I would like to package into a JAR and import as a dependency into a Gradle/Java 8 project (Gradle Wrapper 4.6). The only way I am able to use my JNI classes are if I copy the native library to the Main project's /tmp directory before I initialize any module from the JAR that relies on this native library. I am using a class constructor to pass in the tmp file's absolute file path so it can be loaded in the JNI.

My questions are:

• Is copying the native library from the jar and writing it to the Main application's /tmp directory best practice for a production environment? Are there other potential options using a build tool like Gradle?

• Are there any potential known side effects of referencing a native library this way?

Below is how I'm copying the library in the main application:

static {
        String libName = System.mapLibraryName("OnnxImp");
        File tmpNativeLib = null;

        try (InputStream stream = System.class.getResourceAsStream("/" + libName)) {
            if (stream == null) {
                throw new IllegalStateException("failed to find library " + libName);
            }

            tmpNativeLib = File.createTempFile(libName, null);
            try (FileOutputStream tempOutputStream = new FileOutputStream(tmpNativeLib)) {
                IOUtils.copy(stream, tempOutputStream);
            }

        } catch (Exception e) {
            tmpNativeLib = null;
        } finally {
            onnxAPI = new OnnxAPI(tmpNativeLib.getAbsolutePath());
            tmpNativeLib.delete();
        }
    }

Below is how I'm loading the native library in the JNI:

public class JNIClass {

    public JNIClass() {
        System.loadLibrary("OnnxImp");
    }

    public JNIClass(String tmpNativeLibPath) {
        if (tmpNativeLibPath != null) {
            System.load(tmpNativeLibPath);
        } else {
            throw new IllegalArgumentException("No library path passed into JNIClass");
        }
    }

...

}