Dereferencing in Compostion

Hi All,
I have a question on dereferencing in composition.Suppose i have a an object A which composes
object B which in turn composes object C.So if i dereference object A to null.So, does composition
say to derefrence its child also?........otherwise the weak reference for the garbage collecter will be
there for those objects and might remain in the memory for long.

java_jamboree wrote:
Hi All,
I have a question on dereferencing in composition.Suppose i have a an object A which composes
object B which in turn composes object C.So if i dereference object A to null.So, does composition
say to derefrence its child also?........otherwise the weak reference for the garbage collecter will be
there for those objects and might remain in the memory for long.If there is another reference to object B somewhere, then it will remain in memory.
However, if the only reference to object B is object A, when object A is garbage collected then object B will be also.

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While saving a survey first time, I am getting an error message "Dereferencing the NULL reference".
More details as follows:
Exception: Class CX_SY_REF_IS_INITIAL
Program: CL_SVY_H_SVYDETAIL_IMPL=======CP
Include: CL_SVY_H_SVYDETAIL_IMPL=======CM001
ABAP Class: CL_SVY_H_SVYDETAIL_IMPL
Method: DO_PREPARE_OUTPUT
Line: 26
Long text: An attempt was made to execute a dynamic method callon an initial(NULL-) object reference. The reference must refer to an object.
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Regards,
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Are you using internal CATT Server? If yes then you might need to turn on the CATT server again, see below:
JTS based internal CATServer:
Execute method SET_CATSERVER_JTS of class CL_SURVEY_CATSERVER. Leave parameter USER empty.
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A NULL interface pointer has been dereferenced

This was an answer to someone who had this error message. I scoured the web to see what I could find. This is what I wrote to him. Does anyone else have any answers or know a work around???
Hello,
After doing some research on the error message, "A NULL interface pointer has been dereferenced". There may be a work around.
Are you on a Mac? If you are, you may want to try updating CS4 and Installing the 9.0.2 update either manually or using the Adobe Update Manager. However you mentioned you exported to AVI which I know is a PC codec. Still maybe there is a adobe update for the PC as well.
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If that's the case, convert audio files to aiff or wav, and convert the video into something that doesn't use interframe compression. Maybe Photo Jpeg, Animation, or apple pro res.
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President
DropDrop
http://www.dropdrop.com
Hello once again,
If you could review this small issue I had with one of the templates or forward this to the customer service department.
I have been attempting to render the Grid Warp Final Main Comp for some time now. It took me about 10 minutes to swap the text and pictures out, but the rendering process has taken me over 20 hours and I still havent been able to pinpoint the issue. I have tried rendering in After Effects CS3 and After Effects CS4 both which give the same result. The rendering process will get to anywhere from 400-600 frames and it will give me a warning saying: "After Effects warning: A NULL interface pointer has been dereferenced." Right after clicking OK on this warning another window comes up saying After Effects error: Quicktime export failed (14). This happens whether I export as FLV or if I use the render queue to do avi. Please advise on a possible solution when you have a chance as this heavily delayed our project time line. I have made sure there is no missing files in the project.
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Int dereferencing error when transforming 2d array

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WorkArray.set( new int[] { 6, 3, 0, 7, 4, 1, 8, 5, 2 } );
          for( Tloop = 0; Tloop <= 8; Tloop++ )
               TransForms[0][Tloop].set( WorkArray.getValueAt( Tloop ) );
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That was a mistake yes, ive refined the code more but it still gives me this damn "Int cannot be dereferenced" error.
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Dereferencing a pointer from a Windows API call within labview

I was looking into using the CreateFile windows API funciton within a labview project I'm working on. I found some C code to do essentially what I want to do with this fuction (c code and details are within the attached VI). Unfortanatly its return type is a pointer to a pointer and I got a bit
lost when I looked into how to dereference this pointer to a value. By
the way WinBase.h defines INVALID_HANDLE_VALUE as:
#define INVALID_HANDLE_VALUE ((HANDLE)(LONG_PTR)-1)
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So is it possilble to dereference this pointer or should I be looking for another way of getting the same result?
Attached is the basic mechanism I worked up - the dereferencing block is disabled because it doesn't work. I looked into the memblock() (CIN function) to do the dereferencing but couldn't find all the pieces to that puzzel yet.
Thanks for your help,
Christopher
Attachments:
File IO - is file open3-GetValueByPointer.vi ‏18 KB

Just use "open/create/replace" file in LabVIEW. It should return an error if the file is already open. Just check for that error. If it isn't already open, yes it will open it, but just close it right after.
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Float cannot be dereferenced

Hi,
I get the following compilation error message:
"float cannot be dereferenced"
and i don't know what it meens.
My code was compiling until i add the intValue methode in the last line.
Here is the part of code :
Dimension d,i;
d = getSize(); // i get the size of the frame
i = _imPanel.getSize(); // i get the size of an element in this frame
float hp = i.height/d.height; // i calculate a ratio between those 2 size
float wp = i.width/d.width; // for each dimansion
_imPanel.setPreferredSize(new Dimension((getWidth()*wp).intValue(),(getHeight()*hp).intValue()));
// and i apply a new dimension to the element int the frame using the ration and the new size of the frame.
As the ratio is a float and Dimension needs int in parameters, i decided to use the intValue methode to cast the float into int.
That's it.

Hello,
Your problem is that you are trying to use a primitive type as if it were an object!
You cannot call methods on the primitive types (int, float, double, etc.). Therefore, your line should be converted from:
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Error : char cannot be dereferenced

I wrote this program for my test in high school. I am getting 1 error and cannot fix it. can any1 please tell me how to fix this error. The following is the program and the rror message "-
I AM NEW HERE so i would really BENEFIT from ANY HELP !
class testing
          static int[] search(char list[], char target) {
               int brand[] = new int [list.length];
               for (int i=0; i<list.length; i++) {
                    if (list[i] == target)
                    brand[i] = target.positionOf();
               return brand;
          } // end method
          public static void main (String str[]) {
               char list[] = {'M', 'B', 'A', 'J', 'P', 'J','M', 'J'};
               char target = (str[0].charAt(0));
               System.out.print ("The list = ");
               for (int i =0; i<list.length; i++)
                    System.out.print(list[i] + ", ");
               System.out.println();
System.out.println ("Target letter " + target + " has been found in position " + search(list,target) + ".");
          } // end main
     } // end class
Error :
C:\JPadPro\MyProjects\testing.java:14: char cannot be dereferenced
     brand[i] = target.positionOf();
^
1 error
Finished

My program question was --> Write a program to find a symbol from a list of symbols. Your search method should return all positions in which the target symbol is found.
According to your solution I changed to indexOf() but still i get the same error.
class testing
          static int[] search(char list[], char target) {
               int brand[] = new int [list.length];
               for (int i=0; i<list.length; i++) {
                    if (list[i] == target)
                    brand[ i ] = (list[ i ].indexOf(target));
               return brand;
          } // end method
          public static void main (String str[]) {
               char list[] = {'M', 'B', 'A', 'J', 'P', 'J','M', 'J'};
               char target = str[0].charAt(0);
               System.out.print ("The list = ");
               for (int i =0; i<list.length; i++)
                    System.out.print(list[i] + ", ");
               System.out.println();
               System.out.println ("Target letter " + target + " has been found in position " + search(list,target) + ".");
          } // end main
     } // end class
Error =
The current directory is: C:\JPadPro\MyProjects
C:\JPadPro\MyProjects\testing.java:14: char cannot be dereferenced
          brand[i] = (list.indexOf(target));
^
1 error
Finished

Character cannot be dereferenced?

//output from compiler
partA.java:72: char cannot be dereferenced
                String theCharacterToBeAString = checkValue.toString();
                                                           ^the code
public boolean isOperator(char checkValue)
          String theCharacterToBeAString = checkValue.toString();
          if(theCharacterToBeAString.equals("+"))
               return true;
          else
               return false;
     any ideas?

Woops!
public static boolean isOperator(char checkValue) {
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I don't know what to order. I want PS for photo editing and some composting. I don't do any website work or sharing yet. I have been using elements for a few years and also have Lightroom 5 on my desktop. I don't want to spend $1000s for a bunch of stuff

I don't know what to order. I want PS for photo editing and some composting. I don't do any website work or sharing yet. I have been using elements for a few years and also have Lightroom 5 on my desktop. I don't want to spend $1000s for a bunch of stuff I don't use. Any advice on what to buy?

Well, there is a whole world of free or affordable software out there like GIMP, PDPaint and similar. Otherwise if you want to stick with Adobe stuff signing up for the CC photography program would be the most cost-efficient way...
Mylenium

Dereferencing in a method

Hello,
If I create these simple object types :
create type Article_t as object
( artno integer
, title varchar2(100)
, price           Money_t
create type OrderItem_t as object
( article     REF Article_t
, qty          integer
, member function subtotal (cur in varchar2) return Money_t
The method 'subtotal' could look like :
create type body OrderItem_t as
member function subtotal (cur in varchar2) return Money_t is
m Money_t
begin
m := article.price ;
... --- compute the article price
return m ;
end subtotal ;
end;
But the instruction 'm := article.price' is subject to a compilation error ! Does it mean that I cannot use the dereferencing operator in a procedural statement ???
Must I use a select statement ???
Thanks,
Rigis

Regis,
You cannot navigate through refs within PL/SQL procedural statements. Instead, you must use the function DEREF in a SQL statement. For more information, check out the documentation at http://download-west.oracle.com/otndoc/oracle9i/901_doc/appdev.901/a89856/10_objs.htm#8348.
Regards,
Geoff
Hello,
If I create these simple object types :
create type Article_t as object
( artno integer
, title varchar2(100)
, price           Money_t
create type OrderItem_t as object
( article     REF Article_t
, qty          integer
, member function subtotal (cur in varchar2) return Money_t
The method 'subtotal' could look like :
create type body OrderItem_t as
member function subtotal (cur in varchar2) return Money_t is
m Money_t
begin
m := article.price ;
... --- compute the article price
return m ;
end subtotal ;
end;
But the instruction 'm := article.price' is subject to a compilation error ! Does it mean that I cannot use the dereferencing operator in a procedural statement ???
Must I use a select statement ???
Thanks,
Rigis

ERROR: int cannot be dereferenced

hi everyone i am trying to copmile the following code
public void refreshGUI() {
        MessageBoardQueries MBQ = new MessageBoardQueries();
        Date date = Calendar.getInstance().getTime();
        DateFormat df = new SimpleDateFormat("dd/MM/yyyy");
        String argDate = df.format(date).toString();
        int pNumber = MBQ.queryPending(argDate);
        int aNumber = MBQ.queryAccepted(argDate);
        int dNumber = MBQ.queryDeclined(argDate);
        pendingNumberField.setText(pNumber.toString());
        acceptedNumberField.setText(MBQ.queryAccepted(argDate));
        declinedNumberField.setText(MBQ.queryDeclined(argDate));
    }but i keep getting the error:
int cannot be dereferenced on the line
pendingNumberField.setText(pNumber.toString());
does anyone know why?

because int is a primitive datatype, hence doesn't inherit from java.lang.Object, and as such doesn't have a toString method
try Integer.toString(pNumber) or String.valueOf(pNumber). either is equally valid

Boolean cannot be dereferenced

Hi all any help would be great:
Im getting these errors:
KhanAccount.java:41: boolean cannot be dereferenced
for(int i = 0; i < passwd.length(); i++)
^
KhanAccount.java:42: boolean cannot be dereferenced
if (Character.isDigit(passwd.charAt(i)))
^
KhanAccount.java:45: boolean cannot be dereferenced
if (passwd.length() >= 6 && hasDigit)
^
3 errors
This is the code:
(main method)
import java.text.*;
import javax.swing.*;
public class KhanPassword
public static void main (String [] args)
KhanAccount oneacct = new KhanAccount ();
inputacct (oneacct);
System.exit(0);
public static KhanAccount inputacct (KhanAccount aacct)
/* If an invalid password is entered (or the two entries do not match),
the user should be prompted to try again. */
/* Continuously reads a pair of passwords until the two match.*/
do { // Continuously reads the password until it is a valid one.
do {
String password = JOptionPane.showInputDialog("Enter password:\n"
+ "(must be at least six characters long and have at least one digit)");
aacct.setusername(un);
/* display a message indicating whether it is valid or not */
if (!aacct.setPassword(passwd))
JOptionPane.showMessageDialog(null, "Invalid password!");
else {
JOptionPane.showMessageDialog(null, "Valid password!");
break;
while (true);
/* The password should be prompted for twice */
String reenter = JOptionPane.showInputDialog("Re-enter password:");
/* the entries should match or a message provided to the user. */
if (!passwd.equals(reenter))
JOptionPane.showMessageDialog(null, "Two passwords don't match!");
else
JOptionPane.showMessageDialog(null, "Two passwords match!");
} while (!passwd.equals(reenter));
return aacct;
(called method)
public class KhanAccount
public String username;
public boolean password;
public String reenter;
public boolean passwd;
public static void KhanAccount (){};
     public String getusername()
     return username;
     public boolean getpassword()
     return password;
     public void setusername (String un)
     username = un;
public boolean setPassword()
password = passwd;
/* check if contains digit*/
boolean hasDigit = false;
for(int i = 0; i < passwd.length(); i++)
if (Character.isDigit(passwd.charAt(i)))
hasDigit = true;
if (passwd.length() >= 6 && hasDigit)
password = passwd;
return true;
} else
return false;
}

Btw, isn't better to initiate hasDigit to true and then when
a character is wrong set hasDigit = false and quit loop
with break or so?
And methods called set.. often returns nothing if they return
boolean they are often named with is... or so isPasswd
I've learned basic methods should be divided into three types:
constructors starts with make..
modifiers , set..
predicats , is..
//jF
/* check if contains digit*/
boolean hasDigit = false;
for(int i = 0; i < passwd.length(); i++)
if (Character.isDigit(passwd.charAt(i)))
hasDigit = true;
if (passwd.length() >= 6 && hasDigit)
password = passwd;
return true;
} else
return false;
}

Workflow issue- Dereferencing of the NULL reference

Hello All,
I have an issue with sending mails to external e-mail ids through a workflow process. I am using the FM SO_DOCUMENT_SEND_API1 for sending mails. However, because of the latest Basis version I need to call this FM in a seperate task when the process is in BACKGROUND mode.
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Error: Dereferencing of the NULL reference

Dear Friends,
one of our user is running a report on web bex and he is getting following error.
com.sap.ip.bi.base.application.exceptions.AbortMessageRuntimeException:
Termination message sent ABEND RS_EXCEPTION (000): Dereferencing of the NULL reference
MSGV1: Dereferencing of the NULL reference
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if we run this report using RSRT usin user's user id it is not giving any error.
only genrating error when we try to run using Web Bex .
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comming with them only.
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What does the term dereferenced mean?

hello, i'm gettin a compile error stating that a char cannot be dereferenced.
I'm not exactly sure what the error is saying here's the line of code:
<code>
if (sentence.charAt(0).equals(word.charAt(0)))
startedMatch = true;
</code>
I'm greatful for any help I get
thanks!

so how would I fix it?
I want to compare two strings, well actually find out if the smaller string is within the larger one using recursion...I was just testing out different ways, and obviously that one doesn't work...

Dereferencing in Compostion

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