diff --git a/.cproject b/.cproject
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+++ b/.cproject
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+ TestJNI.h
+ true
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+ true
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+ make
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+ clean
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diff --git a/src/main/java/cz/adamh/utils/NativeUtils.java b/src/main/java/cz/adamh/utils/NativeUtils.java
new file mode 100644
index 00000000..fab5db0c
--- /dev/null
+++ b/src/main/java/cz/adamh/utils/NativeUtils.java
@@ -0,0 +1,145 @@
+/*
+ * Class NativeUtils is published under the The MIT License:
+ *
+ * Copyright (c) 2012 Adam Heinrich
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+package cz.adamh.utils;
+
+import java.io.*;
+import java.nio.file.FileSystemNotFoundException;
+import java.nio.file.FileSystems;
+import java.nio.file.Files;
+import java.nio.file.ProviderNotFoundException;
+import java.nio.file.StandardCopyOption;
+
+/**
+ * A simple library class which helps with loading dynamic libraries stored in the
+ * JAR archive. These libraries usualy contain implementation of some methods in
+ * native code (using JNI - Java Native Interface).
+ *
+ * @see http://adamheinrich.com/blog/2012/how-to-load-native-jni-library-from-jar
+ * @see https://github.com/adamheinrich/native-utils
+ *
+ */
+public class NativeUtils {
+
+ /**
+ * The minimum length a prefix for a file has to have according to {@link File#createTempFile(String, String)}}.
+ */
+ private static final int MIN_PREFIX_LENGTH = 3;
+
+ /**
+ * Temporary directory which will contain the DLLs.
+ */
+ private static File temporaryDir;
+
+ /**
+ * Private constructor - this class will never be instanced
+ */
+ private NativeUtils() {
+ }
+
+ /**
+ * Loads library from current JAR archive
+ *
+ * The file from JAR is copied into system temporary directory and then loaded. The temporary file is deleted after
+ * exiting.
+ * Method uses String as filename because the pathname is "abstract", not system-dependent.
+ *
+ * @param path The path of file inside JAR as absolute path (beginning with '/'), e.g. /package/File.ext
+ * @throws IOException If temporary file creation or read/write operation fails
+ * @throws IllegalArgumentException If source file (param path) does not exist
+ * @throws IllegalArgumentException If the path is not absolute or if the filename is shorter than three characters
+ * (restriction of {@link File#createTempFile(java.lang.String, java.lang.String)}).
+ * @throws FileNotFoundException If the file could not be found inside the JAR.
+ */
+ public static void loadLibraryFromJar(String path) throws IOException {
+
+ if (!path.startsWith("/")) {
+ throw new IllegalArgumentException("The path has to be absolute (start with '/').");
+ }
+
+ // Obtain filename from path
+ String[] parts = path.split("/");
+ String filename = (parts.length > 1) ? parts[parts.length - 1] : null;
+
+ // Check if the filename is okay
+ if (filename == null || filename.length() < MIN_PREFIX_LENGTH) {
+ throw new IllegalArgumentException("The filename has to be at least 3 characters long.");
+ }
+
+ // Prepare temporary file
+ if (temporaryDir == null) {
+ temporaryDir = createTempDirectory("nativeutils");
+ temporaryDir.deleteOnExit();
+ }
+
+ File temp = new File(temporaryDir, filename);
+
+ try (InputStream is = NativeUtils.class.getResourceAsStream(path)) {
+ Files.copy(is, temp.toPath(), StandardCopyOption.REPLACE_EXISTING);
+ } catch (IOException e) {
+ temp.delete();
+ throw e;
+ } catch (NullPointerException e) {
+ temp.delete();
+ throw new FileNotFoundException("File " + path + " was not found inside JAR.");
+ }
+
+ try {
+ System.load(temp.getAbsolutePath());
+ } finally {
+ if (isPosixCompliant()) {
+ // Assume POSIX compliant file system, can be deleted after loading
+ temp.delete();
+ } else {
+ // Assume non-POSIX, and don't delete until last file descriptor closed
+ temp.deleteOnExit();
+ }
+ }
+ }
+
+ private static boolean isPosixCompliant() {
+ try {
+ if (FileSystems.getDefault()
+ .supportedFileAttributeViews()
+ .contains("posix")) {
+ return true;
+ }
+ return false;
+ } catch (FileSystemNotFoundException
+ | ProviderNotFoundException
+ | SecurityException e) {
+ return false;
+ }
+ }
+
+ private static File createTempDirectory(String prefix) throws IOException
+ {
+ String tempDir = System.getProperty("java.io.tmpdir");
+ File generatedDir = new File(tempDir, prefix + System.nanoTime());
+
+ if (!generatedDir.mkdir())
+ throw new IOException("Failed to create temp directory " + generatedDir.getName());
+
+ return generatedDir;
+ }
+}
\ No newline at end of file
diff --git a/src/main/jni/TestJNI.c b/src/main/jni/TestJNI.c
new file mode 100644
index 00000000..a7ca4b05
--- /dev/null
+++ b/src/main/jni/TestJNI.c
@@ -0,0 +1,9 @@
+#include
+#include
+#include "TestJNI.h"
+
+JNIEXPORT void JNICALL Java_org_warp_picalculator_TestJNI_sayHello(JNIEnv *env, jobject thisObj)
+{
+ printf("Hello World!\n");
+ return;
+}
diff --git a/src/main/jni/TestJNI.h b/src/main/jni/TestJNI.h
new file mode 100644
index 00000000..65b039db
--- /dev/null
+++ b/src/main/jni/TestJNI.h
@@ -0,0 +1,21 @@
+/* DO NOT EDIT THIS FILE - it is machine generated */
+#include
+/* Header for class org_warp_picalculator_TestJNI */
+
+#ifndef _Included_org_warp_picalculator_TestJNI
+#define _Included_org_warp_picalculator_TestJNI
+#ifdef __cplusplus
+extern "C" {
+#endif
+/*
+ * Class: org_warp_picalculator_TestJNI
+ * Method: sayHello
+ * Signature: ()V
+ */
+JNIEXPORT void JNICALL Java_org_warp_picalculator_TestJNI_sayHello
+ (JNIEnv *, jobject);
+
+#ifdef __cplusplus
+}
+#endif
+#endif
diff --git a/src/main/jni/TestJNI.o b/src/main/jni/TestJNI.o
new file mode 100644
index 00000000..956366cc
Binary files /dev/null and b/src/main/jni/TestJNI.o differ
diff --git a/src/main/jni/makefile b/src/main/jni/makefile
new file mode 100644
index 00000000..947fb5ce
--- /dev/null
+++ b/src/main/jni/makefile
@@ -0,0 +1,24 @@
+# Define a variable for classpath
+CLASS_PATH = ../../../target/classes
+PATH1A = org/warp/picalculator
+PATH1B = org.warp.picalculator
+
+# Define a virtual path for .class in the bin directory
+vpath %.class $(CLASS_PATH)/$(PATH1A)
+
+all : picalculatornative.dll
+
+# $@ matches the target, $< matches the first dependancy
+picalculatornative.dll : TestJNI.o
+ x86_64-w64-mingw32-gcc.exe -m64 -mtune=generic -Wl,--add-stdcall-alias -shared -o ../resources/$@ $<
+
+# $@ matches the target, $< matches the first dependancy
+TestJNI.o : TestJNI.c TestJNI.h
+ x86_64-w64-mingw32-gcc.exe -m64 -mtune=generic -I"G:\Program Files\Java\jdk1.8.0_144\include" -I"G:\Program Files\Java\jdk1.8.0_144\include\win32" -c $< -o $@
+
+# $* matches the target filename without the extension
+TestJNI.h : TestJNI.class
+ javah -o "$*.h" -classpath "$(CLASS_PATH)" $(PATH1B).$*
+
+clean :
+ rm TestJNI.h TestJNI.o ../resources/picalculatornative.dll
\ No newline at end of file
diff --git a/src/main/resources/picalculatornative.dll b/src/main/resources/picalculatornative.dll
new file mode 100644
index 00000000..f3258dbb
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