My Java application uses a DLL library. How can I get it work from the JAR file?
The DLL is in the project's sources folder. I have to include it in my JAR, extract it at runtime (in the same directory of the jar) and load it.
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1 Answer
You need to put dll in your library path (recommended ) before you try to load it. so that you will have to extract it from jar and copy it into lib path .
private void loadLib(String path, String name) { name = System.mapLibraryName(name); // extends name with .dll, .so or .dylib InputStream inputStream = null; OutputStream outputStream = null; try { inputStream = getClass().getResourceAsStream("/" + path + name); File fileOut = new File("your lib path"); outputStream = new FileOutputStream(fileOut); IOUtils.copy(inputStream, outputStream); System.load(fileOut.toString());//loading goes here } catch (Exception e) { //handle } finally { if (inputStream != null) { try { inputStream.close(); } catch (IOException e) { //log } } if (outputStream != null) { try { outputStream.close(); } catch (IOException e) { //log } } } }
Note: ACWrapper is the class holding the static method
12 Comments
Oneiros
Compiler can't find FileUtils and IOUtiles
Jigar Joshi
you need to add commons-io jar in your classpath
Jigar Joshi
System.getProperty("java.library.path"); //for win machine I remember its C:\\windows\\system32Oneiros
I get Exception in thread "main" java.lang.UnsatisfiedLinkError: no j3dcore-ogl in java.library.path :(
Jigar Joshi
it simply means that the dll hasn't been extracted to lib path.
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