CODEWITHSUNDEEP
javac++dlljava-native-interfacejna
GameZone RO
GameZone RO

Reputation: 63

JNA: The specified module could not be found in compiled jar

I have a C++ .dll in my java Spring Boot project. Everything looks good and method from .dll is called when:

  1. I run application from IDE
  2. I compile file with mvn pack & java -jar target/Project-0.0.1-SNAPSHOT.jar

I tried to copy project to another machine and I got this problem:

  1. When I run application from IDE everything is ok

  2. When I run same command on project mvn pack & java -jar target/Project-0.0.1-SNAPSHOT.jar and it's called .dll method it crash with message error:

java.lang.UnsatisfiedLinkError: The specified module could not be found.

    at com.sun.jna.Native.open(Native Method) ~[jna-4.1.0.jar!/:4.1.0 (b4)]
    at com.sun.jna.Native.open(Native.java:1759) ~[jna-4.1.0.jar!/:4.1.0 (b4)]
    at com.sun.jna.NativeLibrary.loadLibrary(NativeLibrary.java:260) ~[jna-4.1.0.jar!/:4.1.0 (b4)]
    at com.sun.jna.NativeLibrary.getInstance(NativeLibrary.java:398) ~[jna-4.1.0.jar!/:4.1.0 (b4)]
    at com.sun.jna.Library$Handler.<init>(Library.java:147) ~[jna-4.1.0.jar!/:4.1.0 (b4)]
    at com.sun.jna.Native.loadLibrary(Native.java:412) ~[jna-4.1.0.jar!/:4.1.0 (b4)]`.

Note: I have Microsoft Visual C++ 2017 Redistributable on both machines.

If I move .dll file in project root directory it works.

Upvotes: 1

Views: 568

Answers (1)

shizhen
shizhen

Reputation: 12583

You are using JNA inside your project. JNA requires some native libraries be properly installed. E.g. it needs jnidispatch.dll for Windows platform.

For your case, you need to download the required native libs, e.g. https://github.com/java-native-access/jna/blob/master/lib/native/win32, and put it into a directory where can be searched by your JAVA.

Upvotes: 1

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