Here are a few links to useful pieces of documentation for JNAerator :

• Simple example : SimpleMeaningfulExample.
• JNAerator's FAQ
• How JNAerator maps C/ObjectiveC to Java/JNA
• JNAerator's supported command line options and environment variables
• Trouble-shooting JNAeration
• How to store your command line options into files

Please note that JNAerator can operate in a very automated way and help you wrap a native library toto.h + toto.dll/libtoto.so as a self-contained JAR with auto-extractible binaries.