Example of using shared libraries on AIX

This example takes you through the process of using native shared libraries with a Java™ application on AIX® systems.

1. Create a sample application, Sample.java.

   public class Sample
   {
      public native void printFromNative( );
   
      public static void main( String[] args )
      {
         Sample sample = new Sample( );
         sample.printFromNative( );
      }
   
      static
      {
         String sharedLibrary = "libShared.a(libSample.o)";
         try
         {
            System.loadLibrary( sharedLibrary );
         }
         catch ( Exception e )
         {
            System.out.println( "ERROR: Unable to load " + sharedLibrary );
            e.printStackTrace( );
         }
      }
   }

2. Compile Sample.java.

   javac Sample.java

3. Use javah to create a header file for the native code.

   javah Sample

4. Create a file called Sample.c.

   #include <stdio.h>
   #include "Sample.h"
   
   JNIEXPORT void JNICALL Java_Sample_printFromNative( JNIEnv * env, jobject obj )
   {
      printf( "Printing from native\n" );
   }

5. Compile Sample.c into libSample.o.

   cc_r -bM:SRE -bnoentry -bexpall -Ijava_install_dir/include Sample.c
   -o libSample.o -q64

6. Create an archive shared library libShared.a.
   For 32-bit:

   ar -X32 -v -q libShared.a libSample.o

   For 64-bit:

   ar -X64 -v -q libShared.a libSample.o

7. Run the Sample class.

   LIBPATH=. java Sample

   or

   java -Djava.library.path=. Sample

   The program will output:

   Printing from native