Unable to load library in windowsservercore(Docker)

[chenyunchen]

Microsoft is announcing general availability of Windows Server 2016 & windowsservercore container, so I try to use JNA loadlibrary to call myDefine.dll in container. The application all works fine in Windows X64 server 2012 R2 & Windows X64 server 2016 Preview 5,
but fail in windowservercore container(Can't obtain InputStream for win32-x86-64/myDefine.dll.)

I'm not sure if this is jna problems...
Any idea whats going on?

[matthiasblaesing]

The messages tells you, that myDefine.dll can't be found. You can follow the load attemps, if you set the system property jna.debug_load to true. The output is written to System.out so make sure this is displayed/captured.

[chenyunchen]

I have already set jna.library.path and work fine in two other environment.
But strange in windowsservercore... here is my jna debug load

Looking for library 'myDefine'
Adding paths from jna.library.path: <my path>
Trying <my path>\myDefine.dll (Correct Path)
Adding system paths:[]
Trying <my path>\myDefine.dll (Loop again? and not found?)
Looking for lib- prefix
...

[matthiasblaesing]

This happens when you hit the error path (NativeLibrary.java, line 183), my take: Your library (myDefine.dll) depends on another library and that can't be found.

If you use the jna 4.2.* series, you'll need at least the Visual C++ Runtime 2010 (depending on your JVM the 32bit or 64bit version), 4.3.0-SNAPSHOT does not need that.

This matches the experience @dblock demonstrates in PR #685, the containerized environment looks to be a mostly stripped down windows. Check the dependencies of your library with depends.exe and install the necessary dependencies.

[matthiasblaesing]

No further reaction received.