Invoking gcj compile program from "c"

I have written an HelloWorld.java as given below

public class HelloWorld {
   public HelloWorld()
   {
     System.out.println("Hello from constructor");
   }
   public void printline()
   {
     System.out.println("Hello from printline");
   }
   public static void main(String [] args) {
     System.out.println("Hello from main");
     HelloWorld ht = new HelloWorld();
     ht.printline();
   }
 }

I have compiled it with gcj as given belwo
gcj -c HelloWorld.java
gcj -shared HelloWorld.o -o libHelloWorld.so

Copied the .so file into the folder as per LD_LIBRARY_PATH.

I have a cstartup.c which does the JVM Initialization and has to do a
FindClass() as given below

res = JNI_CreateJavaVM(&jvm,&env,&vm_args);
if (res < 0)
{
      fprintf(stderr, "Can't create Java VM\n");
exit(1);
    }


cls = (*env)->FindClass(env, "HelloWorld");
if (cls == 0)
{
       fprintf(stderr, "Can't find HelloWorld class\n");
       exit(1);
    }

This prints me "Can't find HelloWorld class"

Can someone help me in this regard?