I am trying to make use of a static library using JNI. Therefore I am compiling my library statically
g++ -c -std=c++11 -o jnitest_jnitest_App.o jnitest_jnitest_App.cpp -lOtherLib
and then package it
ar rcs jnitest_jnitest_App.a jnitest_jnitest_App.o
Now when I try to run my .jar I get the following error:
jnitest/jnitest_jnitest_App.a: invalid ELF header (Possible cause: endianness mismatch)
at java.base/java.lang.ClassLoader$NativeLibrary.load0(Native Method)
at java.base/java.lang.ClassLoader$NativeLibrary.load(ClassLoader.java:2424)
at java.base/java.lang.ClassLoader$NativeLibrary.loadLibrary(ClassLoader.java:2481)
at java.base/java.lang.ClassLoader.loadLibrary0(ClassLoader.java:2678)
at java.base/java.lang.ClassLoader.loadLibrary(ClassLoader.java:2611)
at java.base/java.lang.Runtime.load0(Runtime.java:814)
at java.base/java.lang.System.load(System.java:1838)
at jnitest.jnitest.App.<clinit>(App.java:13)
I am using a 64-bit Linux Mint 19 and Java 10 (64 bit)
Compiling the native code into a shared library gives no error with JNI. Where is the problem here?
That documentation does not suggest that a static library can be loaded by loadLibrary, only a dynamic (a.k.a shared library) that has itself been statically linked with the VM, which it might well be. Dynamically loading a static library is impossible. See static-libraries