Retrieving the caller of a method

I have used JPDA to get details about any methods being invoked, I would like to now get the details of the invoking method.
I have used the com.sun.jdi.request.*; and com.sun.jdi.event.*;packages to get to call the methodEntry method
whenever such an event occurs. From this I can get the details of the the method which is being invoked, however when
I use the code below to get the caller method(which exists in a different class) for a method in class Test the following is printed
out:
Caller instance of Test(id=53)
This is the code I am using:
void methodEntryEvent(MethodEntryEvent event) {
String methodName = event.method().toString();
System.out.println(methodName);
   try{
         System.out.println( "Caller " + event.thread().frame(0).thisObject());
        } catch (IncompatibleThreadStateException itex) {}
}I would really appreciate it if someone could advise me on the way to get this to work as intended.
Thank you
Dave

then calling it's frame() method with index 0, which
from what I understand is supposed to return the
stackframe containing the caller method.Are you sure ?
frame
public StackFrame frame(int index)
                 throws IncompatibleThreadStateException
    Returns the StackFrame at the given index in the thread's current call stack. Index 0
retrieves the current frame; higher indices retrieve caller frames. The thread must be
suspended (normally through an interruption to the VM) to get this information, and it is
only valid until the thread is resumed again.
    Parameters:
        index - the desired frame
    Returns:
        the requested StackFrame
    Throws:
        IncompatibleThreadStateException - if the thread is not suspended in the target VM
        IndexOutOfBoundsException - if the index is greater than or equal to frameCount() or is negative.(from: http://java.sun.com/j2se/1.4.2/docs/guide/jpda/jdi/com/sun/jdi/ThreadReference.html#frame(int))

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Solved!
Go to Solution.
Attachments:
caller_vi.vi ‏13 KB
called_vi.vi ‏7 KB

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I have a method that calculates the difference
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Any hints ?
See code below.
import java.io.*;
import java.util.*;
import java.text.*;
public class DateGet{
public static void main(String[] args) throws
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//This call is wrong, what should I write ?
}// end main
public static int numberOfDays (int days) {
String aLine, returnDate;
Date today = new Date(); // gets todays date
SimpleDateFormat dateFormat = new
SimpleDateFormat("yyyyMMdd");
Book checkDate;
Scanner fin = new Scanner (new
FileReader("book.txt")); //open infile
while (fin.hasNext()) {
aLine=fin.nextLine();//reads first line
checkDate = new Book (aLine);//creates object
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// isn't empty
String oldDay = (checkDate.getReturnDate());
Date oldDayD = dateFormat.parse(oldDay); //changes
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days = (int)( (today.getTime() - oldDayD.getTime())/
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returnDate System.out.println(days);//writes
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          // a check)
} //end if
}// end while
fin.close(); //closes book.txt
return days;
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I have a method that calculates the difference
between two dates; todays date and a returndate for
Library-books. I have a instance-method with the
get-method mentioned below. But I can't figure out
what call I must use so the program runs properly.
Any hints ?
See code below.
import java.io.*;
import java.util.*;
import java.text.*;
public class DateGet{
public static void main(String[] args) throws
IOException, ParseException{
System.out.print(LabMetoder.numberOfDays(days));
//This call is wrong, what should I write ?
}// end main
public static int numberOfDays (int days) {
String aLine, returnDate;
Date today = new Date(); // gets todays date
SimpleDateFormat dateFormat = new
SimpleDateFormat("yyyyMMdd");
Book checkDate;
Scanner fin = new Scanner (new
FileReader("book.txt")); //open infile
while (fin.hasNext()) {
aLine=fin.nextLine();//reads first line
checkDate = new Book (aLine);//creates object
if (checkDate.getReturnDate()!=null) { // checks that
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String oldDay = (checkDate.getReturnDate());
Date oldDayD = dateFormat.parse(oldDay); //changes
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} //end if
}// end while
fin.close(); //closes book.txt
return days;
}//end NumberOfDaysOK, here is the message again. Thanks.
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See code below.
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import java.util.*;
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public static void main(String[] args) throws IOException, ParseException{
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//This call is wrong, what should I write ?
}// end main
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Scanner fin = new Scanner (new FileReader("book.txt")); //open infile
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days = (int)( (today.getTime() - oldDayD.getTime())/
(1000*60*60*24));
//Calculates the difference between todays date and returnDate System.out.println(days);//writes dateobject on screen (this is
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Hello out there.
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Retrieving the caller of a method

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