Question on initialize method (p. 255 of WDJ Tutorial #3 )

At the top of p. 25 of Tutorial #3, the code block says to add the line:
(a)
wdContext.currentContextElement().setBirthday(new Date(0)));
When I do this, an error message results saying that setBirthday takes a string argument.
So I change the above line to:
b)
wdContext.currentContextElement().setBirthday(new Date(0)));
and the error message goes away.
What's going on here? Is (a) a mistake in the tutorial, or have I overlooked something somewhere ?
Thanks
Dave

Yep it seems there is an error on page 12. If you import the attached source and if you check the simple type BirthDay in the dictionary (in your studio), you can see that the build-in type is set to date and not to string. It is also expected to use a date type for a birthday.
Regards,
Christophe

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Fred,
The reference to VALUE_RETURNNM is in the LOOP for Key Figures
in methond INITIALIZE.
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loop at i_th_sfk assigning <l_s_sfk>
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assign (l_global_name) to <l_global>.
check <l_global> is assigned.
<l_global> = cl_exm_im_rsr_olap_badi=>get_field_position_d(
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Hi All,
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I guess the initialize method should be called on once.
regards,
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Hi,
We had the same problem.
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It appears that this Login Module is covertly delivered as a class in every Netweaver version >= 7.0.
Good luck,
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Two other minor errors in NWDS/WDJ Tutorial #2 (and one mroe question)

First:
In the layout instructions for the QuesdtionMarkView on page 25-26 of Tutorial #2, it does not say to delete the default text view (although it does say to do this for the other views.) So when you first deploy/run as per instruction on page 29, you will see the text "QuestionMarkView" as well as the question mark image itself.
Second (a little more important):
On page 29, the tutorial seems to read as if the code generator has ALREADY added the line
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hi L.M.:
You may be right, though I can't tell at this point if I missed the step you mention when following BG's instructions on page 28 of WDJ Tutorial #2. I'm pretty sure I followed his instructions to set plug values for all view actions, including StartQuizOut for StartPressed. I'm sure I'll hit this again in another tutorial, and will check at that point to see if you're right.
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Thanks
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At the bottom of p.29 of the NWDS/WDJ Tutorial #2, it says to rebuild the project and deploy/run the application so that you can see the "runtime behavior" of the app at this stage of development.
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I also get a clean deploy/run with no errors.
But when the application "pops", there is nothing but a blank frame.
I know this is not a config problem, because I can still run the Tutorial #1 application and have it "pop" the way it is supposed to.
I have redone the tutorial up to page 29 twice now to make sure I have made no mistakes.
But I still get that d***d blank frame when I do what it says to do at the bottom of page 29.
What might have I done wrong that I'm not aware of ??
And how can I tell what I've done wrong if the rebuild and the deploy/run are clean with no error messages ???
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djh

ar/rh -
Yes - your suggestions led me to the right answer.
Although BG says to set the VerticalSlashPosition of the viewset QuizViewSet to 50% when creating it (in #7 at the top of page 19), he does not say to set the default property of this viewset to "true".
As soon as I did this, the view popped.
I'm giving 6 to you and asking Craig/Gali to give ar 6 also.
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IWDMessageManager in WDJ Tutorial #3(Simple Input Form), p.23

Prior to typing in any of the code shown on page 25 of WDJ Tutorial #3, the generated Java code looks like this for the checkDateInPast method:
//@@begin javadoc:checkDateInPast()
/** Declared method. */
//@@end
public void checkDateInPast( java.lang.String fieldName )
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When I type in the first line of the code to be added, the result looks like this:
//@@begin javadoc:checkDateInPast()
/** Declared method. */
//@@end
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I have checked back carefully on previous pages and don't see anything I've neglected to do.
Can someone suggest what might be going on here, either an error in the tutorial or an error in something I've done ????
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Dave

Yes - that did it, thanks.
Before you answered I found another way - I looked back at the Java for the views in previous tutorials and found these statements:
import com.sap.tc.webdynpro.progmodel.api.*;
import com.sap.tc.webdynpro.progmodel.gci.*;
import com.sap.tc.webdynpro.progmodel.context.*;
When I added these, the error message went away also - obviously because the IWDMessageManager is included in progmodel.api.*
But while you're around let me ask you the following question:
When I do it your way (ctrl-shift-o), how does NWDS know to add just the line for the MessageManager:
"import com.sap.tc.webdynpro.progmodel.api.IWDMessageManager;"
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A question about a method with generic bounded type parameter

Hello everybody,
Sorry, if I ask a question which seems basic, but
I'm new to generic types. My problem is about a method
with a bounded type parameter. Consider the following
situation:
abstract class A{     }
class B extends A{     }
abstract class C
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public class Test extends C
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}What I want to do inside the method someMethod in the class Test, is to
return an instance of the class B.
Normally, I'm supposed to be able to do that, because an instance of
B is also an instance of A (because B extends A).
However I cannot compile this program, and here is the error message:
Test.java:16: incompatible types
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1 errorany idea?
many thanks,

Hello again,
First of all, thank you very much for all the answers. After I posted the comment, I worked on the program
and I understood that in fact, as spoon_ says the only returned value can be null.
I'm agree that I asked you a very strange (and a bit stupid) question. Actually, during recent months,
I have been working with cryptography API Core in Java. I understood that there are classes and
interfaces for defining keys and key factories specification, such as KeySpec (interface) and
KeyFactorySpi (abstract class). I wanted to have some experience with these classes in order to
understand them better. So I created a class implementing the interface KeySpec, following by a
corresponding Key subclass (with some XOR algorithm that I defined myself) and everything was
compiled (JDK 1.6) and worked perfectly. Except that, when I wanted to implement a factory spi
for my classes, I saw for the first time this strange method header:
protected abstract <T extends KeySpec> T engineGetKeySpec
(Key key, Class<T> keySpec) throws InvalidKeySpecExceptionThat's why yesterday, I gave you a similar example with the classes A, B, ...
in order to not to open a complicated security discussion but just to explain the ambiguous
part for me, that is, the use of T generic parameter.
The abstract class KeyFactorySpi was defined by Sun Microsystem, in order to give to security
providers, the possibility to implement cryptography services and algorithms according to a given
RFC (or whatever technical document). The methods in this class are invoked inside the
KeyFactory class (If you have installed the JDK sources provided by Sun, You can
verify this, by looking the source code of the KeyFactory class.) So here the T parameter is a
key specification, that is, a class that implements the interface KeySpec and this class is often
defined by the provider and not Sun.
stefan.schulz wrote:
>
If you define the method to return some bound T that extends A, you cannot
return a B, because T would be declared externally at invocation time.
The definition of T as is does not make sense at all.>
He is absolutely right about that, but the problem is, as I said, here we are
talking about the implementation and not the invocation. The implementation is done
by the provider whereas the invocation is done by Sun in the class KeyFactory.
So there are completely separated.
Therefore I wonder, how a provider can finally impelment this method??
Besides, dannyyates wrote
>
Find whoever wrote the signature and shoot them. Then rewrite their code.
Actually, before you shoot them, ask them what they were trying to achieve that
is different from my first suggestion!
>
As I said, I didn't choose this method header and I'm completely agree
with your suggestion, the following method header will do the job very well
protected abstract KeySpec engineGetKeySpec (Key key, KeySpec key_spec)
throws InvalidKeySpecException and personally I don't see any interest in using a generic bounded parameter T
in this method header definition.
Once agin, thanks a lot for the answers.

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Try connecting it to a different computer to see if you can access the data, under no circumstances should you Initialize the drive as all existing data will be lost.
If you still can't access your files, then remove the drive from the case and connect it via an extra SATA cable and power connector (you usually need a desktop PC in order to do this if the drive is a 3.5 inch model, a 2.5in drive will fit into a laptop
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J W Stuart: http://www.pagestart.com
Never be afraid to ask. This forum has some of the best people in the world available to help.

Question repost: Add Methods in a Linked List.

Please excuse my reposting of this question. The previous question had a lot of unformatted code.
Here, I'll just have the two methods that I need help with. If more information is needed, I have it by the buttloads.
They are add methods for a List class:
public boolean add(E o)
Node newNode = new Node();
newNode.data = o;
if (first == null)
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else {
last.next = newNode;
} // end if
size++;
return true;
public void addLast(E o)
Node newNode = new Node();
newNode.data = o;
newNode.previous = last;
if (first == null)
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else {
last.next = newNode;
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Once again: continue to ask for help in your original post. Include your up-to-date code and provide as much details as possible, such as error messages (copy and paste the entire message, do not paraphrase) or for incorrect behviour describe what is happening and what is supposed to happen.
Do this in your original post. I don't want to see another post here!

Question regarding a method of stocking data

I know this thread already is in the "New to Java Technology" Forum, although I said the topic was closed there so I could open it back here.. I realized it would be more fitting here and it would probably get more replies...
I am working with a friend on a Client for Ultima Online and we have to stock data concerning the various objects and characters in the same sector as the Client. We have 3 ideas of what the best method could be, but we have no clue which method would be the most performant (concerning both speed and memory), or if there is a better method to do so.
Here's a description of the methods we thought about:
Method #1
Create many class files for each type of object, having the various related variables in their respective classes...
Exemple: A principal class called DataObject which holds the data common to all objects/characters. Classes which extends DataObject such as DataMobile (for the Characters) and DataItem (for the Items) in which the data specific to characters and items is stocked. And also various classes for the various types of objects such as Containers which will extend DataItem...
Method #2
Create a single class file which would hold an Array containing the various variables and of which the size would be the maximum amount of parameters possible. The array would work in relation with a byte which would hold the type of data stocked into the Array, this way we could know the structure of data and retrieve this data where it is in the Array...
M�thod #3 <= This one was the first idea and we know it is the worse one.. Telling you about it though
Create a single class file which would hold all the possible variables. These variables would only be used when necessary.
M�thod #4
Create a single class file which would extend java.util.Hashtable. The parameters would be stocked this way: The Key mapped to the value would be the type of parameter (represented by a Byte (not byte)) (type of parameter such as Serial, Name, Strenght, Dexterity, etc...). And the value would be stocked as a String, Integer, Short or Byte according to the case (once again, it isn't primitives, it is the classes from java.lang.*).
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This is not an advanced language topic. This is a beginner question, I would be very surprised if you got an answer in this forum.

Question on getEncoded method of Key (interface) and its impl

Hi,
I need help to understand on how we use the encoded method of security key. The following is quoted from Sun spec about the getEncoded() as a reference.
"An Encoded Form. This is an external encoded form for the key used when a standard representation of the key is needed outside the Java Virtual Machine, as when transmitting the key to some other party. The key is encoded according to a standard format (such as X.509 or PKCS#8), and is returned using the getEncoded method".
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To restore key from encoded data you have to use one of the KeySpec lasses in your case DESKeySpec. Then you can use KeyFactory (SecretKeyFactory in this case) class to regenerate key.
SecretKeyFactory factory = SecretKeyFactory.getInstance("DES", "SunJCE");
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I undestand that a static method may only be hidden in a subclass not overridden. But, I don't understand why an exception type thrown by the subclass method must be a subtype of the exception type thrown by the superclass method. For example,
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public class B extends A {
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I don't understand your point. In either case, static
or non-static, ExceptionB must be the same or a
subclass of ExceptionA. My question is why this
matters in the static case.I think it's for binary compatibility, that is, so that you can make changes to Java source files and recompile only the changed files. If you originally did not have the static method in class B, and called B.foo() in another class, the A.foo() method would actually be called at run time. If you then change the B class and add a foo() method, it must be compatible so that the other class's method call is still valid.
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Question on initialize method (p. 255 of WDJ Tutorial #3 )

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