Handling Collection return values best paractice

hi;
over 50% of my code returns Collection implementations as return values plus those Collections have proprietry objects that have nested Collections inside them.
what a best practice for dealing with such a problem when trying to expose these methods as webservices?
i could not understand by searching the forum if i can return a Collection or not (there are mixed posts on that).
any help would be great
P.S: i am using jboss application server + axis

Your method seems to return an entity with semantic
maening, otherwise the values wouldn't belong
together. So what's wrong with an object? Especially
if you're doing further calculations with the data -
they should be performed by this object then.They are not particularly well related... apart from they are returned together.
I have several different cases that I am currently working with. In one instance (c, n_t, s_f_0, s_f_1, s_vPrime) are returned, they are all BigIntegers but that is where the similarities end. c is a MessageDigest (converted to BigInteger), n_t is a random number. The remaining values have something in common s_x := r_x + c * x where x = {s_f_0, s_f_1, s_vPrime}.
The variable names are taken straight from a research paper... hence their nonsensical meaning. I have opted to keep them throughout for ease of development (I don't fancy having a lookup table....)

Similar Messages

Handling the return values and passing values to a dialog

Dear all,
I am trying to return values from a dialog to a page.
I am following a tutorial:
http://www.oracle.com/technology/products/jdev/101/howtos/adfdialog/index.html
its okey, but I couldnt understand the following code:
public void handleReturn(ReturnEvent event)
if (event.getReturnValue() != null)
Customer cst;
String name;
String psw;
cst = (Customer)event.getReturnValue();
CustomerList.getCustomers().add(cst);
name = cst.getFirstName();
psw = cst.getPassword();
inputText1.setSubmittedValue(null);
inputText1.setValue(name);
inputText2.setSubmittedValue(null);
inputText2.setValue(psw);
please help me what are these variables?
that I could be able to map with me own.
Regards:
Muhammad Nadeem
[email protected]

If you look further down on the tutorial, you will notice that these values are set in the dialog done() and cancel() actionListeners. Similarly, you will return your own object(s) when calling returnFromProcess() - see the done() method.
Regards,
Nick

Handle hex return values in mapping

Hi
I have a return from SAP Content Server that comes in hex format. My message mapping are not happy and as far as I have understood, normal message mapping and XSLT cannot handle this return.
I have tried with ABAP mapping, but the output stream is still on hex format. Does anyone know how a java mapping can handle this? The input stream is ok, but I would like to output a string (or something else readable for the mapping) instead of the outputstream from the java mapping. Do I have to use StreamTransformation for the java mapping, or do I have any other options?
Thanks!
regards Ole

First you should mention, how you want the output, then people can give advice, how to achive this.
When I have understood right, your response is a plain hex string like this:
127464fde452f.
The easiest way to handle this, is envelope this with a tag:
<root>127464fde452f</root>

Handling Popup Return Values

Hi
I have created a popup that I can pass values to, perform a search in, and return an object from with the values I want set. It works fine.
The problem I have is I want to display one value from the returned object and have another value hidden but available when the originating page submits.
If I display both values in fields on the originating form so they can be seen, all is well. If I try and use a hidden field there is no partial trigger attribute so it doesn't work. If I use a standard text field but change the render attribute to false so it doesn't display, I don't have a value submitted.
The only solution I have so far is to record the value I don't want displayed in my session bean, maybe this is the excepted approach?
Tom
Message was edited by:
user571146

Errrr, don't know is the honest answer.
I'm new to using JDev and the ADF stuff.
It would seem the hiddenInput field is no good because of the missing PartialTrigger attribute.
If I use the normal text field and turn rendering off then I can set the PartialTrigger, in the return handler I use the lines...
inputText4.setSubmittedValue(null);
inputText4.setValue(d.getId());
to set the value, as describe in the SRDemo example.
I then use EL to read the value back later on when I am handling the submit of the entire page.
If I set the render attribute to false the, I don't appear to get a value back from the EL.
Does that make more sense?
Tom

Multiple return values (Bug-ID 4222792)

I had exactly the same request for the same 3 reasons: strong type safety and code correctness verification at compile-time, code readability and ease of mantenance, performance.
Here is what Sun replied to me:
Autoboxing and varargs are provided as part of
JSRs 14 and 201
http://jcp.org/en/jsr/detail?id=14
http://jcp.org/en/jsr/detail?id=201
See also:
http://forum.java.sun.com/forum.jsp?forum=316
http://developer.java.sun.com/developer/earlyAccess/adding_generics/index.html
Multiple return values is covered by Bug-ID 4222792
Typically this is done by returning an array.
http://developer.java.sun.com/developer/bugParade/bugs/4222792.html
That's exactly the problem: we dynamically create instances of array objects that would better fit well within the operand stack without stressing the garbage collector with temporary Array object instances (and with their backing store: 2 separate allocations that need to be recycled when it is clearly a pollution that the operand stack would clean up more efficiently)
If you would like to engage in a discussion with the Java Language developers, the Generics forum would be a better place:
http://forum.java.sun.com/forum.jsp?forum=316
I know that (my report was already refering to the JSR for language extension) Generics is not what I was refering to (even if a generic could handle multiple return values, it would still be an allocated Object
instance to pack them, i.e. just less convenient than using a static class for type safety.
The most common case of multiple return values involve values that have known static datatypes and that should be checked with strong typesafety.
The simple case that involves returning two ints then will require at least two object instances and will not solve the garbage collection overhead.
Using a array of variable objects is exactly similar, except that it requires two instances for the components and one instance for the generic array container. Using extra method parameters with Integer, Byte, ... boxing objects is more efficient, but for now the only practical solution (which causes the least pollution in the VM allocator and garbage collector) is to use a custom class to store the return values in a single instance.
This is not natural, and needlessly complexifies many interfaces.
So to avoid this pollution, some solutions are used such as packing two ints into a long and returning a long, depacking the long after return (not quite clean but still much faster at run-time for methods that need to be used with high frequencies within the application. In some case, the only way to cut down the overhead is to inline methods within the caller code, and this does not help code maintenance by splitting the implementation into small methods (something that C++ can do very easily, both because it supports native types parameters by reference, and because it also supports inline methods).
Finally, suppose we don't want to use tricky code, difficult to maintain, then we'll have to use boxing Object types to allow passing arguments by reference. Shamely boxed native types cannot be allocated on the operand stack as local variables, so we need to instanciate these local variables before call, and we loose the capacity to track the cases where these local variables are not really initialized by an effective call to the method that will assign them. This does not help debugging, and is against the concept of a strongly typed language like Java should be:
Java makes lots of efforts to track uninitialized variables, but has no way to determine if an already instanciated Object instance refered in a local variable has effectively received an effective assignment because only the instanciation is kept. A typical code will then need to be written like this:
Integer a = null;
Integer b = null;
if (some condition) {
//call.method(a, b, 0, 1, "dummy input arg");
// the method is supposed to have assigned a value to a and b,
// but can't if a and b have not been instanciated, so we perform:
call.method(a = new Integer(), b = new Integer(), 0, 1, "dummy input
arg");
// we must suppose that the method has modified (not initialized!)
the value
// of a and b instances.
now.use(a.value(), b.value())
// are we sure here that a and b have received a value????
// the code may be detected at run-time (a null exception)
// or completely undetected (the method() above was called but it
// forgot to assign a value to its referenced objects a and b, in which
// case we are calling in fact: now.use(0, 0); with the default values
// or a and b, assigned when they were instanciated)
Very tricky... Hard to debug. It would be much simpler if we just used:
int a;
int b;
if (some condition) {
(a, b) = call.method(0, 1, "dummy input arg");
now.use(a, b);
The compiler would immediately detect the case where a and b are in fact not always initialized (possible use bere initialization), and the first invoked call.method() would not have to check if its arguments are not null, it would not compile if it forgets to return two values in some code path...
There's no need to provide extra boxing objects in the source as well as at run-time, and there's no stress added to the VM allocator or garbage collector simply because return values are only allocated on the perand stack by the caller, directly instanciated within the callee which MUST (checked at compile-time) create such instances by using the return statement to instanciate them, and the caller now just needs to use directly the variables which were referenced before call (here a and b). Clean and mean. And it allows strong typechecking as well (so this is a real help for programmers.
Note that the signature of the method() above is:
class call {
(int, int) method(int, int, String) { ... }
id est:
class "call", member name "method", member type "(IILjava.lang.string;)II"
This last signature means that the method can only be called by returning the value into a pair of variables of type int, or using the return value as a pair of actual arguments for another method call such as:
call.method(call.method("dummy input arg"), "other dummy input arg")
This is strongly typed and convenient to write and debug and very efficient at run-time...

Can anyone give me some real-world examples where
multiple return values aren't better captured in a
class that logically groups those values? I can of
course give hundreds of examples for why it's better
to capture method arguments as multiple values instead
of as one "logical object", but whenever I've hankered
for multiple return values, I end up rethinking my
strategy and rewriting my code to be better Object
Oriented.I'd personally say you're usually right. There's almost always a O-O way of avoiding the situation.
Sometimes though, you really do just want to return "two ints" from a function. There's no logical object you can think of to put them in. So you end up polluting the namespace:
public class MyUsefulClass {
public TwoInts calculateSomething(int a, int b, int c) {
public static class TwoInts {
    //now, do I use two public int fields here, making it
    //in essence a struct?
   //or do I make my two ints private & final, which
   //requires a constructor & two getters?
//and while I'm at it, is it worth implementing
//equals(), how about hashCode()? clone()?
//readResolve() ?
}The answer to most of the questions for something as simple as "TwoInts" is usually "no: its not worth implementing those methods", but I still have to think about them.
More to the point, the TwoInts class looks so ugly polluting the top level namespace like that, MyUsefulClass.TwoInts is public, that I don't think I've ever actually created that class. I always find some way to avoid it, even if the workaround is just as ugly.
For myself, I'd like to see some simple pass-by-value "Tuple" type. My fear is it'd be abused as a way for lazy programmers to avoid creating objects when they should have a logical type for readability & maintainability.
Anyone who has maintained code where someone has passed in all their arguments as (mutable!) Maps, Collections and/or Arrays and "returned" values by mutating those structures knows what a nightmare it can be. Which I suppose is an argument that cuts both ways: on the one hand you can say: "why add Tuples which would be another easy thing to abuse", on the other: "why not add Tuples, given Arrays and the Collections framework already allow bad programmers to produce unmainable mush. One more feature isn't going to make a difference either way".
Ho hum.

Best way to use return values in a webservices

Hi all,
Scenario: We have three web services. What is the best way to do this acitivity or is it possible?
webservice1
webservice2
webservice3
Call invoke webservice1 & 2 (they need to their work do be done parallely and will return a value eg "string")and call webservices3 with input values as the returned value from webservice 1 & 2.
Thanks,
Shashi
Edited by: Shashi_sr on Sep 17, 2010 1:46 PM

Hi Shashi,
The way to achieve your desired functionality is as follows:
Create a flow activity, and within that flow activity, you will call web services (using an invoke activity) webservice1 and webservice2.
After the flow activity, you will then use another invoke activity to call the 3rd webservice using the output given by the first 2 webservices.

Return values for deadlock handling in BDB-SQLITE

The whitepaper titled "Oracle Berkeley DB SQL API vs.SQLite API – A Technical Evaluation, November 2010" notes that
all programs should be able to handle SQLITE_ERROR or SQLITE_LOCKED while handling potential deadlocks. From the sqlite errorcode page
#define SQLITE_ERROR 1 /* SQL error or missing database */
Further documentation lists SQLITE_ERROR as "This return value indicates that there was an error in the SQL that was passed into the sqlite_exec."
Question 1:
Why is BDB-SQLITE raising a generic errorcode "SQLITE_ERROR" when we have to abort a transaction and start all over again?
While running my test application under intensive load, I have never gotten SQLITE_ERROR. I have gotten SQLITE_LOCKED and occasionally SQLITE_BUSY which is being handled in my code.
Question 2:
Can someone please confirm whether is this indeed is the expected behaviour?
Thank you for your time.

The behavior described in the white paper only applies to Berkeley DB version 5.0, versions 5.1 and beyond do not have this behavior.
In DB-5.0 SQLITE_ERROR is returned when you attempt to use an explicit transaction that has already returned SQLITE_LOCKED. The reason for this is because in BDBSQL (as opposed to SQLite) SQLITE_LOCKED is returned when a transaction is forced to give up its locks because it has entered a state of deadlock with another transaction. Because the transaction has lost its locks it is invalid and cannot be used anymore other than to abort it, that is why SQLITE_ERROR is returned if you continue to use the transaction. In DB-5.1 and beyond SQLITE_LOCKED means only the last operation lost its locks and has been rolled back, the transaction is still good and can still be committed or be used to perform other operations.
I hope this clears up your confusion.
Lauren Foutz

Help with dynamic statement returning values into collection

Hi All
I am trying to use dynamic statement to return values into a collection using the returning clause. However, I get an ORA-00933 error. Here is a simple setup:
create table t(
    pk number,
    id_batch varchar2(30),
    date_created date,
    constraint t_pk primary key ( pk )
create or replace type num_ntt is table of number;
create or replace type vc2_ntt is table of varchar2(30);
create or replace
package pkg
as
type rec is record(
      pk        num_ntt,
      id_batch vc2_ntt
procedure p(
      p_count in number,
      p_rt    out nocopy rec
end pkg;
create or replace
package body pkg
as
procedure p(
      p_count in number,
      p_rt    out nocopy rec
is
begin
      execute immediate '
      insert into t
      select level, ''x'' || level, sysdate
      from   dual
      connect by level <= :p_count
      returning pk, id_batch into :pk, :id_batch'
      using p_count returning bulk collect into p_rt.pk, p_rt.id_batch;
end p;
end pkg;
declare
r pkg.rec;
begin
pkg.p( 5, r );
end;
/

sanjeevchauhan wrote:
but I am working with dynamic statement and returning multiple fields into a collection.And using an INSERT...SELECT statement combined with a RETURNING INTO clause still does not work. Whether it's dynamic SQL or not: it doesn't work. The link describes a workaround.
By the way, I don't see why you are using dynamic SQL here. Static SQL will do just fine. And so you can literally copy Adrian's setup.
Regards,
Rob.

Fatal error when installing master collection "[FATAL] Setup - Error installing C:\Users\Desktop\MasterCollection_CS6_LS6\packages\core\PDApp.pimx package. Return Value of pim_installPackage = -1

Hi,
When I try to install a trial product like photoshop cs6 or master collection cs6 I keep getting the error " Installer failed to initialized". I used Adobe cleaner to remove all cs6 products and tried again, but no luck, the same error.
I opened the the log file and found that line :
[FATAL] Setup - Error installing C:\Users\moshe-a\Desktop\MasterCollection_CS6_LS6\packages\core\PDApp.pimx package.
Return Value of pim_installPackage = -1
Any idea how to fix the problem?
Thank you, Momu

start at the top and work your way down applying applicable fixes until your problem is resolved.
if cc (win): https://helpx.adobe.com/creative-cloud/kb/creative-cloud-desktop-application-failed.html
if, your error is:
"Installer failed to initialize. File not found." or "Installer failed to initialize. This could be due to missing files."
first, rename OOBE Folder to OOBE.old.
to find OOBE:
64 bit win OS: Program Files x86\Common Files\Adobe\OOBE
32 bit win OS: Program Files \Common Files\Adobe\OOBE
mac os: HD>library>application support>adobe>caps
mac os: USER>library>application support>adobe>OOB
if that fails or isn't the exact error you see, uninstall, clean (http://www.adobe.com/support/contact/cscleanertool.html) and reinstall.
if you're using a dvd to install:
copy the disc contents to a desktop directory and install from that directory.
if you're using a mac:
1. Try to Create a new user account in Mac with Administrator Priviledges.
2. Login to the New user, Navigate to Mac HD> Application> Utilities> Adobe Installer folder, Locate products like Adobe Reader, Adobe Flash, Adobe Air and un-install them
3. Navigate to User Library> Application Support> Adobe and move Adobe to Trash.
4. Navigate to Mac HD> Library> Application Support> Adobe and move Adobe to Trash.
5. Start the installation again.
if everything applicable above fails, check your installation logs:
http://helpx.adobe.com/photoshop-elements/kb/troubleshoot-install-using-logs-elements.html

When i add menu bar in my user interface gives me error that this handle is not a panel handle(return value -42)

i have 3 panels in my application and parent panel is displayed first then i display other two panels which come to the front then on entering correct password i discard the child panel and then you can see parent panel , but there is an issue when i add menu to my parent panel i dont know whats wrong when i add menu bar in my user interface (parent panel) gives me error that this handle is not a panel handle(return value -42) for a child panel. when i dont open and display child panel then its fine , and even without menu added to my parent panel all my panels and my application works perfactly

Hello smartprogrammer,
some more informations are needed in order to properlu help you in this situation:
- Are you adding menus dynamically at runtime or in the UIR editor? If dynamically: how are you loading the menu bar?
- Are you dynamically tailoring the menu bar at runtime (adding or deleting menu items, dimming / undimming some of them or checking / unchecking)?
- Can you post the code where you are getting the error, documenting variables and scope (local to the function, global to the source file, global to the project)?
You can look at uirview.prj example that ships with CVI for an example of LoadMenuBar (the exampl eis in <CVI samples>\userint folder): in that project, the menu bar is shown as a context menu when you right-click on a tree element (see DeferredMenuCB callback).

How to handle return values in AppleScript

Warning: AppleScript newbie on the loose without adult supervision.
I have an Omnis Studio app that calls an AppleScript that in turn invokes a couple of shell commands. As an aside, I don't believe Omnis Studio can invoke a shell script directly without other complications.
What I would like to do is capture the return code and/or any stdout from the shell commands in the AppleScript, then pass that result out as a return value from the AppleScript.
Q1. How does one hold the return values, exit code, stdout, etc. of a shell script in AppleScript?
Q2. How do I tell AppleScript to pass the results back to the calling routine?
Examples, links to documentation, etc, will be gratefully accepted.

There is a whole forum for just Applescript here:
http://discussions.apple.com/forum.jspa?forumID=724

JDBC - how to handle insert that returns value (bind?)

Hi,
I'm trying to do an insert into a table in an Oracle database with an auto-incrementing primary key (using a trigger and sequence) and I need to retrieve the value after the insert. From SQL*Plus, I'd enter:
var id number;
INSERT INTO mytable (name) VALUES ('foo') RETURNING id into :id;
whereupon if I do "print id", I get the value of the id field from the newly-inserted record.
The big question is how to achieve the same thing using JDBC. I've been flailing around all morning trying to figure it out and suspect it has something to do with using a CallableStatement instead of a PreparedStatement, but all of the examples I've seen so far only deal with calling stored procedures instead of raw SQL, and they all omit the part where some variable is bound to the resultset.
Assuming I want to have the Java variable (int? Integer()?) "newId" set to the value being returned by the SQL statement as "id" (or ":id"?), what do I need to do between getting the connection and looking at "newId" to see what the value returned by the statement is?
ie,
Connection conn = db.connect();
int newId;
// show me what I need to do here
System.out.println("The id of the newly-inserted record is:");
System.out.println(newId);Thanks!

This is untested:
use the executeUpdate() method from the Statement. The return value will be your result from the RETURNING id portion of your SQL statement, if not then you'll probably have to do a seperate select or/and explicit return to get the value back from SQL.

Client/server RMI app using Command pattern: return values and exceptions

I'm developing a client/server java app via RMI. Actually I'm using the cajo framework overtop RMI (any cajo devs/users here?). Anyways, there is a lot of functionality the server needs to expose, all of which is split and encapsulated in manager-type classes that the server has access to. I get the feeling though that bad things will happen to me in my sleep if I just expose instances of the managers, and I really don't like the idea of writing 24682763845 methods that the server needs to individually expose, so instead I'm using the Command pattern (writing 24682763845 individual MyCommand classes is only slightly better). I haven't used the command pattern since school, so maybe I'm missing something, but I'm finding it to be messy. Here's the setup: I've got a public abstract Command which holds information about which user is attempting to execute the command, and when, and lots of public MyCommands extending Command, each with a mandatory execute() method which does the actual dirty work of talking to the model-functionality managers. The server has a command invoker executeCommand(Command cmd) which checks the authenticity of the user prior to executing the command.
What I'm interested in is return values and exceptions. I'm not sure if these things really fit in with a true command pattern in general, but it sure would be nice to have return values and exceptions, even if only for the sake of error detection.
First, return values. I'd like each Command to return a result, even if it's just boolean true if nothing went wrong, so in my Command class I have a private Object result with a protected setter, public getter. The idea is, in the execute() method, after doing what needs to be done, setResult(someResult) is called. The invoker on the server, after running acommand.execute() eventually returns acommand.getResult(), which of course is casted by the client into whatever it should be. I don't see a way to do this using generics though, because I don't see a way to have the invoker's return value as anything other than Object. Suggestions? All this means is, if the client were sending a GetUserCommand cmd I'd have to cast like User user = (User)server.executeCommand(cmd), or sending an AssignWidgetToGroup cmd I'd have to cast like Boolean result = (Boolean)server.executeCommand(cmd). I guess that's not too bad, but can this be done better?
Second, exceptions. I can have the Command's execute() method throw Exception, and the server's invoker method can in turn throw that Exception. Problem is, with a try/catch on the client side, using RMI (or is this just a product of cajo?) ensures that any exception thrown by a remote method will come back as a java.lang.reflect.InvocationTargetException. So for example, if in MyCommand.execute() I throw new MySpecialException, the server's command invoker method will in turn throw the same exception, however the try/catch on the client side will catch InvocationTargetException e. If I do e.getCause().printStackTrace(), THERE be my precious MySpecialException. But how do I catch it? Can it be caught? Nested try/catch won't work, because I can't re-throw the cause of the original exception. For now, instead of throwing exceptions the server is simply returning null if things don't go as planned, meaning on the client side I would do something like if ((result = server.executeCommand(cmd)) == null) { /* deal with it */ } else { /* process result, continue normally */ }.
So using the command pattern, although doing neat things for me like centralizing access to the server via one command-invoking method which avoids exposing a billion others, and making it easy to log who's running what and when, causes me null-checks, casting, and no obvious way of error-catching. I'd be grateful if anyone can share their thoughts/experiences on what I'm trying to do. I'll post some of my code tomorrow to give things more tangible perspective.

First of all, thanks for taking the time to read, I know it's long.
Secondly, pardon me, but I don't see how you've understood that I wasn't going to or didn't want to use exceptions, considering half my post is regarding how I can use exceptions in my situation. My love for exception handling transcends time and space, I assure you, that's why I made this thread.
Also, you've essentially told me "use exceptions", "use exceptions", and "you can't really use exceptions". Having a nested try/catch anytime I want to catch the real exception does indeed sound terribly weak. Just so I'm on the same page though, how can I catch an exception, and throw the cause?
try {
catch (Exception e) {
Throwable t = e.getCause();
// now what?
}Actually, nested try/catches everywhere is not happening, which means I'm probably going to ditch cajo unless there's some way to really throw the proper exception. I must say however that cajo has done everything I've needed up until now.
Anyways, what I'd like to know is...what's really The Right Way (tm) of putting together this kind of client/server app? I've been thinking that perhaps RMI is not the way to go, and I'm wondering if I should be looking into more of a cross-language RPC solution. I definitely do want to neatly decouple the client from server, and the command pattern did seem to do that, but maybe it's not the best solution.
Thanks again for your response, ejp, and as always any comments and/or suggestions would be greatly appreciated.

LiveCycle DS , can't get the return value of fill( arg) from Assembler class

Hi all!
I'm a have small problem , can any one help me? Please
I make a project which very similar to Product project(in
example).
1) Have Assembler class: I work correctly
package flex.samples.stock;
import java.util.List;
import java.util.Collection;
import java.util.Map;
import flex.data.DataSyncException;
import flex.data.assemblers.AbstractAssembler;
public class StockAssembler extends AbstractAssembler {
public Collection fill(List fillArgs) {
StockService service = new StockService();
System.out.print(fillArgs.size());
return service.getStocks();
public Object getItem(Map identity) {
StockService service = new StockService();
return service.getStock(((Integer)
identity.get("StockId")).intValue());
public void createItem(Object item) {
StockService service = new StockService();
service.create((Stock) item);
public void updateItem(Object newVersion, Object
prevVersion, List changes) {
StockService service = new StockService();
boolean success = service.update((Stock) newVersion);
if (!success) {
int stockId = ((Stock) newVersion).getStockId();
throw new DataSyncException(service.getStock(stockId),
changes);
public void deleteItem(Object item) {
StockService service = new StockService();
boolean success = service.delete((Stock) item);
if (!success) {
int stockId = ((Stock) item).getStockId();
throw new DataSyncException(service.getStock(stockId),
null);
some require class is ok.
2) I configure in data-management-config.xml
<destination id="stockinventory">
<adapter ref="java-dao" />
<properties>
<source>flex.samples.stock.StockAssembler</source>
<scope>application</scope>
<metadata>
<identity property="StockId"/>
</metadata>
<network>
<session-timeout>20</session-timeout>
<paging enabled="false" pageSize="10" />
<throttle-inbound policy="ERROR" max-frequency="500"/>
<throttle-outbound policy="REPLACE"
max-frequency="500"/>
</network>
</properties>
</destination>
3) My client app:
I use :
<mx:ArrayCollection id="stocks"/>
<mx:DataService id="ds" destination="stockinventory"/>
ds.fill(stocks); --> Problem here
When I run this app, The StockAssembler on the server work
correctly (i use printout to debug) . But variable stocks can't get
the return value,it is a empty list.
Please help me!

Hi,
The executeQueryAsync method is “asynchronous, which means that the code will continue to be executed without waiting for the server to
respond”.
From the error message “The collection has not been initialized”, which suggests that the object in use hadn’t been initialized after the execution of the executeQueryAsync method.
I suggest you debug the code in browser to see which line of code will throw this error, then you can reorganize the logic of the code to avoid using the uninitialized object.
A documentation from MSDN about Using the F12 Developer Tools to Debug JavaScript Errors
for your reference:
http://msdn.microsoft.com/en-us/library/ie/gg699336(v=vs.85).aspx
Best regards
Patrick Liang
TechNet Community Support

The returned value of BAPI call

Hi, experts,
I have a question about returned value of BAPI call.
when the returned value is mapped as an attribute and this return value itsself is of the type: table of a certain structure. Is there any possibility that the value of this table still can be extracted from the mapped attribute? If it is possible, how?
If not, how should this kind of situation be handled:
when the returned value of the function at the backend has more one layer structure?
Thanks and best regards,
Fan

In my experience you shouldn't use the service wizard to generate the context of such deeply nested structures. They don't generate or map correctly because it tries to put the table type as the type of the context attribute.
Instead you should propery model the relationship in the context using nested nodes. Here is an example of address <-> address text where you can have multiple address texts per address. From the service this was a returned nested table.
****BP Address and Address Text
data lo_nd_bp_addr type ref to if_wd_context_node.
data lo_nd_bp_addr_text type ref to if_wd_context_node.
data lo_el_bp_addr type ref to if_wd_context_element.
* navigate from <CONTEXT> to <BP_ADDR> via lead selection
lo_nd_bp_addr = wd_context->get_child_node( name = wd_this->wdctx_bp_addr ).
lo_nd_bp_addr->bind_table( wd_this->gt_bp_addr ).
****Add the Address Text Table as Child of each Address Context Record
data element_set type wdr_context_element_set.
field-symbols <wa_set> like line of element_set.
field-symbols <wa_bp_addr> like line of wd_this->gt_bp_addr.
element_set = lo_nd_bp_addr->get_elements( ).
loop at element_set assigning <wa_set>.
    read table wd_this->gt_bp_addr index sy-tabix assigning <wa_bp_addr>.
    lo_nd_bp_addr_text = <wa_set>->get_child_node( name = if_componentcontroller=>wdctx_bp_addr_text ).
    lo_nd_bp_addr_text->bind_table( <wa_bp_addr>-t_text ).
endloop.

Handling Collection return values best paractice

Similar Messages

Maybe you are looking for