Is that possible to call a static library?

Hi,
I'm using JNI to call a third party static library (.a file), but I always got the java.lang.UnsatisfiedLinkError. I'm not sure whether it is possible to invoke APIs from static c libraries. Anyone here has this kind of experience ?
Here is my scenario:
I have a native method in java class named sendMessage(), and implement this method in message.c(function: Java_MessageSender_sendMessage()) by calling a API in a third party static library(msg.a). However when I run the java class, I always got the error. But If I just run the main() of message.c which also calling the Java_MessageSender_sendMessage(), it will be ok.
some code of c file:
Java_MessageSender_sendMessage()
printf("hello");//this line can be executed
sendMessage();//this line is calling the static library, and error occurs here when the function called from java side
int main(int argc, char *argv[])
Java_MessageSender_sendMessage()//It's ok when directly run this application
Any information will be helpful to me.
Thanks in advance

Hi, bschauwejava
Thanks for your reply.
As you have said, the static libraries already have been linked when I made the libmessage.sl using aCC:
aCC -z -b -o libmessage.sl message.o -lmsg
Is there anything wrong with the command?

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