Android Question Trying to create a library for xmlsec

I'm trying to create a library for xmlsec, using some jar from Apache.

Looks it should work correctly, however, when I run the B4A application seems there is some binary object I haven't in that jar.

java.lang.UnsatisfiedLinkError: dalvik.system.PathClassLoader[DexPathList[[zip file "/data/app/b4a.example-1/base.apk"],nativeLibraryDirectories=[/data/app/b4a.example-1/lib/arm, /vendor/lib, /system/lib]]] couldn't find "libxmlsec-2.0.8.so"

I've made some mistake? There are a way to get this lib?

Many thanks in advance.

Maurizio