javajava-native-interfaceshared-librariescross-platformjnaerator

How to use JNAerator with multiple dynamic libraries under one header?


I am using JNAerator to generate a single jar file I can include in a project, and I'd like to support the dynamic libraries for each operating system and arch all in this single jar.

In fiddling with JNAerator so far, I've been able to include a single dynamic library using a command like the following:

java -jar jnaerator.jar test.dll test.h [...] -mode StandaloneJar

However, this only packages test.dll, while I have dynamic libraries for multiple systems (test_win32.dll, test_win64.dll, libtest_mac.dylib, libtest_linux_x86.so, and libtest_linux_amd64.so) which I would like to all have packaged into and supported by one jar.

Is there any way to do this "all-in-one" approach with one run of JNAerator, or must I generate a different jar file for each platform?


Solution

  • JNAerator has an -arch option designed just for that, although the doc is currently terribly vague about it:

    java -jar jnaerator-0.12-shaded.jar \
      -arch win32 win32/test.dll \
      -arch win64 win64/test.dll \
      -arch darwin_universal mac/libtest.dylib \
      -arch linux_x86 linux_x86/libtest.so \
      -arch linux_x64 linux_amd64/libtest.so \
      test.h \
      -mode StandaloneJar \
      -jar test.jar
    

    This will bundle the libraries under the format expected by BridJ (see its wiki page about embedded binaries):

    unzip -l test.jar gives:

        ...
        0  04-09-15 22:45   lib/win32/test.dll
        0  04-09-15 22:45   lib/win64/test.dll
        0  04-09-15 22:45   lib/darwin_universal/libtest.dylib
        0  04-09-15 22:45   lib/linux_x86/libtest.so
        0  04-09-15 22:45   lib/linux_x64/libtest.so
    

    The library names are currently expected to be exactly lib<name>.(so|dylib) or <name>.dll for every platform, although that could easily be fixed if you ask.

    (note: I'm the author of BridJ & JNAerator)