Java APIs

Hi,

After writting the Java code using native method, Like

package jni;
public class jniFile {
static{
System.loadLibrary("jniFile");
}

public jniFile() {
System.out.println("Inside constructor ");
}

private native void printMessage(String msg);
public static void main(String[] args) {
jniFile m= new jniFile();
m.printMessage("String from java");
}
}
I tried to create the header file using javah -jni jniFile.
i got "javadoc: error - Illegal package name: "D:\JNI\build\classes\jni" error.
Can any one help me.
Thanks in advance.