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I inherited a working large Java8 project that needs to be re-architected. It builds a jar, but also includes an example main (not included in the jar) and a deep tree of libs including some .dll files deep in the libs/ tree (dll's also NOT included in the jar).

At some point, the code in the jar calls Native.loadLibrary("fti2x.dll", fti2xWrapper.class, [Map< String, Integer>] options) on the simple file name "fti2x.dll" -- with no path components -- and the load succeeds. This .dll is only located deep in the libs/ directory on my computer. How did the jar, running under eclipse, figure out this was in /libs/client/usb/CommLib/amd64/fti2x.dll without specifying the path to it?

If I copy just the jar, the example main, and the libs/ directory to a new project, how do I configure it in Eclipse(Mars) to find the .dll for the Native.loadLibrary call? (Just simply doing so fails, so I am missing some config.)

How do I do execute the main.class outside of Eclipse and have it find the .dll?

Is there possibly some Java code I am missing that sets this path? If so, what do I look for?

simpleuser
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1 Answers1

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There is a system property that is used to specify the path that JNA uses to search for native libraries: jna.library.path. Try printing out its value just after the library loads successfully in the old project to see if it is being set.

This answer explains how to set a system property in an Eclipse run configuration. Outside of Eclipse, specify a value for it using the -D command-line switch to the JVM, e.g. 

java -Djna.library.path=<some path> YourMainClass
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Luke Woodward
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