Re: Getting a field value in the calling class

Eric Sosman <>
Thu, 13 Mar 2008 12:17:52 -0400
<1205425069.793296@news1nwk> wrote:


I have written two classes hoping to find out in run time the value of
a field in the calling class. But my attempt resulted in a run time
error. Anyone could help fix my code or suggestion? Thank you!


public class GetCallingClass {
    void printCallingClassInfo() throws ClassNotFoundException,
            SecurityException, NoSuchFieldException, IllegalArgumentException,
            IllegalAccessException {
        StackTraceElement[] ste = new Throwable().getStackTrace();
        if (ste.length > 1) {
            System.out.println(ste[1].getClassName()); // print CallClass

            Class c = ste[1].getClass();
            Integer m2 = (Integer)
            System.out.println("m2 = "+m2);
                    .getClass().getName()); // print java.lang.Class


public class CallClass {
    public int m = 0;
    public static void main(String[] args) throws SecurityException,
ClassNotFoundException, NoSuchFieldException,
IllegalArgumentException, IllegalAccessException {
        GetCallingClass c = new GetCallingClass();

     I'm not sure what else is going on, but one thing stands
out: There are no occurrences of `m' in this program, because
no instances of CallClass have been created. Where is the `m'
whose value you think you are going to get?


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