java - UnsatisfiedLinkError when running JAR from outside directory -

i have javafx application deploy jar. application loads , uses native library (a jni interface).

the dll expected in same directory jar. how load library. have verified path correct dll.

            string jarpath = classloader.getsystemclassloader().getresource(".").getpath();             system.out.println(jarpath);             system.load(jarpath + "_jni.dll"); 

here issue: when execute java run jar same directory jar, works fine. when execute java run jar outside directory, throws:

java.lang.unsatisfiedlinkerror: c:/test/_jni.dll: %1 not valid win32 application @ java.lang.classloader$nativelibrary.load(native method)

for example:

::this works. dll loads , executes successfully. cd c:/test java -jar pdwin.jar  ::this not work. unsatisifedlinkerror java -jar "c:/test/pdwin.jar" 

my thoughts there bitness differences in components, or jni method signatures wrong, not true, have verified jvm 64 bit, , dll 64 bit.

the fact dll works fine when run java inside directory containing jar, doesn't work when run outside strange... (note: print path 'jarpath' , same correct path in both cases)

the problem is: windows automatically searches dlls in system directories , current working directory. in first example working directory set correctly in second not.

there multiple solutions this: creating start script allways changes working directory simplest.

my prefered solution be: put dll inside jar. use classloader open dll inputstream, copy in tempfile , load tempfile absolute system path. (see here: extract , load dll jar)

this solution can adapted work on different platforms.