Unfortunately I don't have ldd available on target :/
On build platform it does not work:

$ ldd libMyLib.so
./libMyLib.so:
ldd: ./libMyLib.so: Exec format error

I suspect jni.h because I worked with VM from another supplier before,
and jni.h (and other headers) was delivered together with VM.
This dedicated version of jni.h differs from standard Sun's jni.h

Full error message:

...
class load: java/util/jar/Attributes$Name
class load: MyLib/Application
class load: MyLib.Application from: file:XXXXX
class load: App
class load: App from: file:XXXXX
unknown relocation type
unknown relocation type
...
unknown relocation type
unknown relocation type
class load: java/lang/LinkageError
class load: java/lang/UnsatisfiedLinkError
Exception in thread "main" java.lang.UnsatisfiedLinkError: MyLib
(Unresolved symbols)
class load: java/lang/StackTraceElement[]
       at java.lang.ClassLoader.loadLibraryWithPath(Unknown Source)
       at java.lang.ClassLoader.loadLibraryWithClassLoader(Unknown
Source)
       at java.lang.System.loadLibrary(Unknown Source)
       at jsal.Application.<clinit>(Unknown Source)
       at java.lang.J9VMInternals.initializeImpl(Native Method)
       at java.lang.J9VMInternals.initialize(Unknown Source)
       at java.lang.J9VMInternals.initialize(Unknown Source)

I have checked library dependencies using objdump.exe
Dependencies are:

NEEDED      libcpp.so.4
NEEDED      libc.so.2

Both libraries are on LDD_LIBRARY_PATH.

Do you know how to get this header for
IBM J9 2.3 QNX arm-32 (J2ME Foundation Specification v1.0)

I searched in IBM page without success so far ... :/