Doubt regarding Generic methods
I have 4 generics Methods getEJBHome,getEJBLocalHome ,findEJBLocalHomeAndPopulateCache,findEJBHomeAndPopulateCache
public <T extends EJBHome> T getEJBHome(final String jndiName,final Class<T> ejbHomeClass) throws NamingException,ClassCastException{
T ejbHome=null;
try{
if(serviceLocatorCache.containsKey(jndiName)){
ejbHome=(T)serviceLocatorCache.get(jndiName);
else{
ejbHome=findEJBHomeAndPopulateCache(jndiName,ejbHomeClass);
catch(NamingException namingException ){
System.err.println("Exception in getEJBHome ["+namingException.getMessage()+"]");
throw namingException;
catch(ClassCastException classCastException ){
System.err.println("Exception in getEJBHome ["+classCastException.getMessage()+"]");
throw classCastException;
return ejbHome;
private <T extends EJBHome> T findEJBHomeAndPopulateCache(final String jndiName,final Class<T> ejbHomeClass) throws NamingException{
T ejbHome=null;
try{
ejbHome=(T)javax.rmi.PortableRemoteObject.narrow(context.lookup(jndiName),ejbHomeClass);
serviceLocatorCache.put(jndiName,ejbHome);
catch(NamingException namingException){
System.err.println("Exception in findEJBHomeAndPopulateCache ["+namingException.toString()+"]");
throw namingException;
return ejbHome;
}i am calling findEJBHomeAndPopulateCache like normal method call,When i try to call findEJBLocalHomeAndPopulateCache from getEJBLocalHome it shows compile time error .
public <T extends EJBLocalHome> T getEJBLocalHome(final String jndiName) throws NamingException{
T ejbLocalHome=null;
try{
if(serviceLocatorCache.containsKey(jndiName)){
ejbLocalHome=(T)serviceLocatorCache.get(jndiName);
else{
ejbLocalHome=this.<T>findEJBLocalHomeAndPopulateCache(jndiName);
//ejbLocalHome=findEJBLocalHomeAndPopulateCache(jndiName); ERROR
catch(NamingException namingException ){
System.err.println("Exception in getEJBLocalHome ["+namingException.getMessage()+"]");
throw namingException;
catch(Exception exception ){
System.err.println("Exception in getEJBLoacalHome ["+exception.getMessage()+"]");
throw new NamingException("Exception in getEJBLoacalHome ["+exception.getMessage()+"]");
return ejbLocalHome;
}when i try to call method findEJBLocalHomeAndPopulateCache like ejbLocalHome=findEJBLocalHomeAndPopulateCache(jndiName);
i am getting compile time error
ServiceLocator.java:133: type parameters of <T>T cannot be determined; no unique maximal instance ex
ists for type variable T with upper bounds T,javax.ejb.EJBLocalHome
[javac] ejbLocalHome=findEJBLocalHomeAndPopulateCache(jndiName);
[javac] ^
when i am calling that method like
this.<T>findEJBLocalHomeAndPopulateCache(jndiName); it is not showing any error.normally we are invoking generic methods like normal methods ?
Why i am getting a compile time error for findEJBLocalHomeAndPopulateCache method?
method findEJBLocalHomeAndPopulateCache is as shown
private <T extends EJBLocalHome> T findEJBLocalHomeAndPopulateCache(final String jndiName) throws NamingException{
T ejbLocalHome=null;
try{
ejbLocalHome=(T)context.lookup(jndiName);
serviceLocatorCache.put(jndiName,ejbLocalHome);
catch(NamingException namingException){
System.err.println("Exception in findEJBLocalHomeAndPopulateCache ["+namingException.toString()+"]");
throw namingException;
return ejbLocalHome;
}Plz help
Hi Ben,
Thanks for your replay, Can you please tell me why in first case ie getEJBHome method call findEJBHomeAndPopulateCache(jndiName,ejbHomeClass) not causing any error.In both case upper bound of T is EJBLocalHome .Kindly give me a clear idea.
Plz help
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i have a generic method has shown below
public static <E extends Number> <E>process(E list){
List<Interger> output = new ArrayList<Interger>(); or List<Number> output = new ArrayList<Number>();
return output ;
if delcare the output variable using Interger or Number . when i am returning the output . it is showing me compiler error and it suggests me to add cast List<E>. Why i not able understand. please clarify my doubt.
Thanks
Sura.Maruthi
Edited by: sura.maruthi on Sep 21, 2008 9:48 PMYour method declaration is garbled; there can be only one <...> clause, eg
public static <E extends Number> E process(E list);This declaration says that for any subclass E of Number, the method process takes a single E instance (called list!?) and returns a single E instance. A valid implementation would be
return list;I'm guessing you want the parameter to have type List<E>?. Like this:
public static <E extends Number> E process(List<E> list);This declaration says that for any subclass E of Number, the method process takes a list of E's and returns a single E instance. A valid implementation would be
return list.get(0);Or perhaps you also want to return a list of numbers?
public static <E extends Number> List<E> process(List<E> list);This declaration says that for any subclass E of Number, the method process takes a list of E's and returns another list of E's. A valid implementation would be
return list;Note that you cannot just return a list of Integers or Floats, because your generic method must work for any subclass of Number, and you're promising to return back a list of the same type as the argument passed in.
Edited by: nygaard on Sep 22, 2008 10:05 AM -
Doubt Regarding Collection Methods
Hello,
I am working on Oracle version 10g Release 2
I wanted to know that how can we find a particular name (person) exists in a Collection..
Below is my Code
DECLARE
TYPE nested_tab IS TABLE OF VARCHAR2(100);
l_tab nested_tab := nested_tab();
BEGIN
SELECT e.ent_id BULK COLLECT INTO l_tab
FROM entity_master e
WHERE e.ent_id IN ('N002208', 'Z002011', 'V002313', 'X002011'..... & so on);
IF l_tab.EXISTS('N002208') THEN
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ORA-06502 - Numeruc or Value Error
what can be the work around for this...?Aijaz Mallick wrote:
Ok.
But It would be really helpfull if you Elaborate this Example a Bit...
I mean the I/O part because Quering table also Require I/OANY data that you need to access (in any computer system and language) requires I/O. That data needs to be read from disk (PIO or physical I/O) or buffer cache (LIO or logical I/O) and processed.
So the important part is optimising I/O. If you only need 1MB of data from a 100GB data structure, you do not want to I/O that entire data structure to find that 1MB of data that is relevant to your code.
The answer to this is three fold.
Firstly, you design that data structure optimally. In databases, that means a proper and sound relational database model.
Secondly, you implement that data structure optimally. In databases, that means using the most appropriate physical data model for storing that relational data model. Using the features like indexing, partitioning, index organised tables, and so on.
Lastly, in some cases your requirements will require scanning a large volume of that data structure. Which means that there is no option but to use a lot of I/O. In such a case, parallelising that I/O is important. I/O has inherent latency. Which means idle time for your code, waiting for data to arrive from the I/O system. Parallel processing enables one to address this and increase performance and scalability.
So what do you need to do with your "large" table?
- make sure it is correctly modelled at a logical data model level
- make sure it is optimally implemented physically in Oracle, making best use of the features that the Oracle RDBMS provide
- when your code has to deal with large volumes of data, design and code for parallel processing
& how about Java Part. ..?Java is worse than PL/SQL in this regard as the data path for data to travel from the database layer into Java is longer and slower than the same path to PL/SQL.
Storing/caching that data in the application layer is an attempt to address the cost of this data path. But this is problematic. If another application makes a change to data in the database, the cached data in the application tier is stale - and incorrect. Without the application layer knowing about it.
Storing/caching that data in the application layer means a bigger and more expensive h/w footprint for the application layer. It means that scaling also requires a cluster cache in the application layer to address scalability when more application servers are added. This is complex. And now reintroduce a data path that runs over the network and across h/w boundaries. Which is identical to the data path that existed between the database layer and application layer in the first place.
It also makes the border between the database layer and application layer quite complex as caching data in the application layer means that basic database features are now also required in the application layer. It is an architectural mess. Contains complex moving parts. Contains a lot more moving parts.
None of this is good for robustness or performance or scalability. Definitely not for infrastructure costs, development costs,and support and maintenance costs, either.
In other words, and bluntly put. It is the idiotic thing to do. Unfortunately it is also the typical thing done by many J2EE architects and developers as they have a dangerous and huge lack of knowledge when it comes to how to use databases. -
Hi Guys,
I have a small doubt regarding Generic Delta Extraction. In Generic Delta i choose Calday on Posting Date. And am getting data on Daily basis. Here My doubt is can I use this posting date in field selection in Info package. If not?Please give me clarification regarding the same.
Thanks,
Tg.Hi Tg,
If I have understood correctly, Posting date has been chosen as the delta field in datasource.
I don't think you can use the fiield in infopackage selection because the field is used to extract delta for that generic datasource and the system doesn't allow us to put a filter on the filed which is responsible for delta .
If system wud have allowed us to put a selection on that field then correct delta will not be loaded in BI.
System can not allow us to play with deltas and hence the field is not avaialble for selection .
Hope it helps,
Manish Sharma -
[ABAP OO] Generic method get lines
Hi Experts,
I am creating a generic method to get the numbers of lines from any table, like below:
TABNAME type string.
LINES type i.
METHOD get_lines_from_any_dbtab.
DATA lo_tab TYPE REF TO data .
CREATE DATA lo_tab TYPE TABLE OF (tabname) .
SELECT * FROM (tabname) INTO TABLE lo_tab .
DESCRIBE TABLE lo_tab LINES lines .
CONDENSE lines
METHOD.
I have an error message during the compilation as:
LO_TAB is not an internal table.
Any idea ?
Kind regards.
Rachid.Got it:
DATA lo_tab TYPE REF TO data .
FIELD-SYMBOLS <fs_dbtab> TYPE ANY TABLE .
CREATE DATA lo_tab TYPE TABLE OF (tabname).
ASSIGN lo_tab->* TO <fs_dbtab> .
SELECT * FROM (tabname) INTO TABLE <fs_dbtab> .
DESCRIBE TABLE <fs_dbtab> LINES lines .
CONDENSE lines . -
What's the general consensus regarding Generics in Java?
Just curious what folks think about how it's implemented in Java and whether you're in favor of it or not (not that it will make any difference).
I haven't been using it yet because I am still working on 1.4.x, but I've been familiarizing myself as best as I can with how to use them.
I realize they fill an important need, but I am not convinced they were/are worth the rather steep price paid for readability.
Curious to get others opinions on this. Regards,
~Bill
Message was edited by:
abillconslSo "new MyWrapper(aString)" is untyped, we need to
use "new MyWrapper<String>(aString)" whichviolates
the principle of Dont-repeat-yourself.I don't think so... what if I wanted to create
something like this?
new MyWrapper<Number>(new Integer(4))That's still possible. My problem is that it works exactly as I'd like it to work as long as I call a method, but not when I instanciate a new object. Let's assume for a second that MyWrapper has a static generic method createWrapper() that just calls the constructor:
public class MyWrapper<T> {
private T foo;
public MyWrapper(T foo) {
this.foo = foo;
public T getFoo() {
return foo;
public static <WT,VT extends WT> MyWrapper<WT> createWrapper(VT foo) {
return new MyWrapper<WT>(foo);
}Here WT is the generic type of the returned wrapper (WrapperType) and VT is the type of the value(ValueType).
Now we see a strange discrepancy on how the object instanciation ("call of a constructor", so to speak) works and how calling another Method works:
MyWrapper<Integer> i1 = new MyWrapper(Integer.valueOf(1)); //unsafe, not infered
MyWrapper<Integer> i2 = MyWrapper.createWrapper(Integer.valueOf(1)); //ok, everything fine
MyWrapper<Number> n1 = new MyWrapper(Integer.valueOf(1)); //unsafe, not infered
MyWrapper<Number> n2 = MyWrapper.createWrapper(Integer.valueOf(1)); //ok, everything fineIf you compile this code (or simply paste it in any modern IDE) you'll see that you'll get warning in the two lines calling the constructor. While the lines calling createWrapper() seem ok. So somehow the compiler can infer the type information when calling a method but can't do that when calling a constructor. That's what's troubling me. -
Doubt Reg Generic Delta "Safety Interval" Setting
Hi Experts,
I have a doubt regarding Setting "Safety Interval Upper Limit" and Lower limit in RSO2 for generic delta.
What does this setting imply?
If I do setting for calender day say both 1 then wht will be difference between delta before setting amd after setting?
Plz explain in terms other tham help provided...
Points will be awarded to say thanks..
Thanks in advance,
SorabhHi Sorabh,
Here some SAP informations:
Safety Interval Upper Limit of Delta Selection
This field is used by DataSources that determine their delta generically using a repetitively-increasing field in the extract structure. The field contains the discrepancy between the current maximum when the delta or delta init extraction took place and the data that has actually been read. Leaving the value blank increases the risk that the system could not extract records arising during extraction. Example: A time stamp is used to determine the delta. The time stamp that was last read is 12:00:00. The next delta extraction begins at 12:30:00. In this case, the selection interval is 12:00:00 to 12:30:00. At the end of extraction, the pointer is set to 12:30:00. A record - for example, a document- is created at 12:25 but not saved until 12:35. It is not contained in the extracted data but, because of its time stamp, is not extracted the next time either.
For this reason, the safety margin between read and transferred data must always be larger than the maximum length of time that it takes to create a record for this DataSource (with a time stamp delta), or it must display an interval that is sufficiently large (for determining delta using a serial number).
Safety Interval Lower Limit
This field contains the value taken from the highest value of the previous delta extraction to determine the lowest value of the time stamp for the next delta extraction. For example: A time stamp is used to determine a delta. The extracted data is master data: The system only transfers after-images that overwrite the status in the BW. Therefore, a record can be extracted into the BW for such data without any problems.
Taking this into account, the current time stamp can always be used as the upper limit when extracting: The lower limit of the next extraction is not seamlessly joined to the upper limit of the last extraction. Instead, its value is the same as this upper limit minus a safety margin. This safety margin needs to be big enough to contain all values in the extraction which already had a time stamp when the last extraction was carried out but which were not read. Not surprisingly, records can be transferred twice. However, for the reasons above, this is unavoidable.
Extracted Data Delta Type
The system uses the delta type to determine how extracted data is to be interpreted in BW, and into which data targets it can be posted.
A distinction is made between the following:
1. Additive delta
The key figures for extracted data are added up in BW. DataSources with this delta type can supply data to ODS objects and InfoCubes.
2. New status for changed records
Each record to be loaded delivers the new status for the key figures and characteristics. DataSources with this delta type can write to ODS objects or master data tables.
Check also examples in "How to... Create Generic Delta" under www.service.sap.com/bi.
Ciao.
Riccardo. -
StartDrag using Generic method in Actionscript 3
Hi,
AS3:
How to get general id (or) name from xml loaded images. bcoz, i want to drag and drop that images in generic method. Now, i currently used the event.target.name for each one.
So, code length was too large. See my code below.
/*********loading images through xml********/
var bg_container_mc:MovieClip
var bg_bg_myXMLLoader:URLLoader = new URLLoader();
bg_bg_myXMLLoader.load(new URLRequest("xml/backgroundimages.xml"));
bg_bg_myXMLLoader.addEventListener(Event.COMPLETE, processXML_bg);
function processXML_bg(e:Event):void {
var bg_myXML:XML=new XML(e.target.data);
columns_bg=bg_myXML.@COLUMNS;
bg_my_x=bg_myXML.@XPOSITION;
bg_my_y=bg_myXML.@YPOSITION;
bg_my_thumb_width=bg_myXML.@WIDTH;
bg_my_thumb_height=bg_myXML.@HEIGHT;
bg_my_images=bg_myXML.IMAGE;
bg_my_total=bg_my_images.length();
bg_container_mc = new MovieClip();
bg_container_mc.x=bg_my_x;
bg_container_mc.y=bg_my_y;
ContentHead.addChild(bg_container_mc);
for (var i:Number = 0; i < bg_my_total; i++) {
var bg_thumb_url=bg_my_images[i].@THUMB;
var bg_thumb_loader = new Loader();
bg_thumb_loader.load(new URLRequest(bg_thumb_url));
bg_thumb_loader.contentLoaderInfo.addEventListener(Event.COMPLETE, thumbLoaded_bg);
bg_thumb_loader.name="bg_load"+i;
bg_thumb_loader.addEventListener(MouseEvent.MOUSE_DOWN, bg_down)
bg_thumb_loader.x = (bg_my_thumb_width-18)*bg_x_counter;
bg_thumb_loader.y = (bg_my_thumb_height-45)*bg_y_counter;
if (bg_x_counter+1<columns_bg) {
bg_x_counter++;
} else {
bg_x_counter=0;
bg_y_counter++;
function thumbLoaded_bg(e:Event):void {
var my_thumb_bg:Loader=Loader(e.target.loader);
var sprite:Sprite = new Sprite();
var shape:Shape = new Shape();
shape.graphics.lineStyle(1, 0x0098FF);
shape.graphics.drawRect(e.target.loader.x-2, e.target.loader.y-2, e.target.loader.width+4, e.target.loader.height+4);
sprite.addChild(shape);
sprite.addChild(my_thumb_bg);
sprite.x=4;
bg_container_mc.addChild(sprite);
my_thumb_bg.contentLoaderInfo.removeEventListener(Event.COMPLETE, thumbLoaded_bg);
// get name for each image.
I want to change this code in generic method. do needful.
function bg_down(event:MouseEvent):void {
var bg_name:String=new String(event.currentTarget.name);
var bg_load:MovieClip=event.currentTarget as MovieClip;
if (event.currentTarget.name=="bg_load0") {
var alaska_mc:alaska_png=new alaska_png();
addChild(alaska_mc);
alaska_mc.x=stage.mouseX;
alaska_mc.y=stage.mouseY;
alaska_mc.name="alaska_duplicate"+alaska_inc;
alaska_inc++;
alaska_mc.startDrag(false);
alaska_mc.addEventListener(MouseEvent.MOUSE_UP, stdrag);
alaska_mc.addEventListener(MouseEvent.MOUSE_UP, stdrag);
if (event.currentTarget.name=="bg_load1") {
var lake_mc:lake_png=new lake_png();
addChild(lake_mc);
lake_mc.x=lake_mc.mouseX;
lake_mc.y=lake_mc.mouseY;
lake_mc.name="lake_duplicate"+lake_inc;
lake_inc++;
lake_mc.startDrag(false);
lake_mc.addEventListener(MouseEvent.MOUSE_UP, stdrag);
if (event.currentTarget.name=="bg_load2") {
var mountn_mc:mountn_png=new mountn_png();
addChild(mountn_mc);
mountn_mc.x=mountn_mc.mouseX;
mountn_mc.y=mountn_mc.mouseY;
mountn_mc.name="mountn_duplicate"+mountn_inc;
mountn_inc++;
mountn_mc.startDrag(false);
mountn_mc.addEventListener(MouseEvent.MOUSE_UP, stdrag);
if (event.currentTarget.name=="bg_load3") {
var town_mc:town_png=new town_png();
addChild(town_mc);
town_mc.x=town_mc.mouseX;
town_mc.y=town_mc.mouseY;
town_mc.name="town_duplicate"+town_inc;
town_inc++;
town_mc.startDrag(false);
town_mc.addEventListener(MouseEvent.MOUSE_UP, stdrag);
if (event.currentTarget.name=="bg_load4") {
var water_mc:water_png=new water_png();
addChild(water_mc);
water_mc.x=water_mc.mouseX;
water_mc.y=water_mc.mouseY;
water_mc.name="water_duplicate"+water_inc;
water_inc++;
water_mc.startDrag(false);
water_mc.addEventListener(MouseEvent.MOUSE_UP, stdrag);
if (event.currentTarget.name=="bg_load5") {
var city_mc:city_png=new city_png();
addChild(city_mc);
city_mc.x=city_mc.mouseX;
city_mc.y=city_mc.mouseY;
city_mc.name="city_duplicate"+city_inc;
city_inc++;
city_mc.startDrag(false);
city_mc.addEventListener(MouseEvent.MOUSE_UP, stdrag);
if (event.currentTarget.name=="bg_load6") {
var citywide_mc:citywide_png=new citywide_png();
addChild(citywide_mc);
citywide_mc.x=citywide_mc.mouseX;
citywide_mc.y=citywide_mc.mouseY;
citywide_mc.name="citywide_duplicate"+citywide_inc;
citywide_inc++;
citywide_mc.startDrag(false);
citywide_mc.addEventListener(MouseEvent.MOUSE_UP, stdrag);
if (event.currentTarget.name=="bg_load7") {
var downtown_mc:downtown_png=new downtown_png();
addChild(downtown_mc);
downtown_mc.x=downtown_mc.mouseX;
downtown_mc.y=downtown_mc.mouseY;
downtown_mc.name="downtown_duplicate"+downtown_inc;
downtown_inc++;
downtown_mc.startDrag(false);
downtown_mc.addEventListener(MouseEvent.MOUSE_UP, stdrag);
if (event.currentTarget.name=="bg_load8") {
var powerlines_mc:powerlines_png=new powerlines_png();
addChild(powerlines_mc);
powerlines_mc.x=powerlines_mc.mouseX;
powerlines_mc.y=powerlines_mc.mouseY;
powerlines_mc.name="powerlines_duplicate"+powerlines_inc;
powerlines_inc++;
powerlines_mc.startDrag(false);
powerlines_mc.addEventListener(MouseEvent.MOUSE_UP, stdrag);
if (event.currentTarget.name=="bg_load9") {
var tropical_mc:tropical_png=new tropical_png();
addChild(tropical_mc);
tropical_mc.x=tropical_mc.mouseX;
tropical_mc.y=tropical_mc.mouseY;
tropical_mc.name="tropical_duplicate"+tropical_inc;
tropical_inc++;
tropical_mc.startDrag(false);
tropical_mc.addEventListener(MouseEvent.MOUSE_UP, stdrag);
if (event.currentTarget.name=="bg_load10") {
var waters_mc:waters_png=new waters_png();
addChild(waters_mc);
waters_mc.x=waters_mc.mouseX;
waters_mc.y=waters_mc.mouseY;
waters_mc.name="waters_duplicate"+waterthumb_inc;
waterthumb_inc++;
waters_mc.startDrag(false);
waters_mc.addEventListener(MouseEvent.MOUSE_UP, stdrag);
Please suggest me if any one.
Regards,
Viji. SPost AS3 questions in the AS3 forum, not the AS1/2 forum.
-
Hello All,
I'm confused about the following generic method signature . Compilation fails
public class Animal{}
public class Dog extends Animal{}
public <E super Dog> List<E> methodABC(List<E> list){
The compiler gives the following error
E cannot be resolved to a type
E cannot be resolved to a type
Syntax error on token "super", , expected
if i change the declaration of E to <E extends Dog>, no compiler error.
An early response will be highly appreciated. Thanks in advance.
Kind Regards.
Hasnain Javed Khan.you cannot use "super" on a type variable, only on wildcards
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Java.lang.AssertionError: Can not find generic method public abstract
I just downloaded the JDev 11g and trying to test the JEE web app. Below is my install:
JDeveloper 11g
JEE Web Project
EJB 3.0
Steps taken:
1. Created an entity bean from a table.
2. Created a session facade
3. Create sample Java client to use the facade (Right-click on the session facade, and choose New sample Java Client from the context menu)
4. Run the session facade
5. Run the Java client
I got the following error.
java.lang.AssertionError: Can not find generic method public abstract java.util.List<com.oracle.orm.model.ejb.persistence.Hosttags> queryHosttagsFindAll() in EJB Object
I checked the methods in the beans and interfaces, they are all there. Any idea?
Thanks.I have a customer that has this problem.
We wrote me that:
we got a java.lang.NoSuchMethodException while the method exist even in the generated (by WLS) stub.
when we change the interface by putting a "list" instead of list <> then it works.
hope it can help, but should be great know why.
Regards
Marco
글 수정: user10649412 -
few doubts regarding servlets :
1. Can a servlet have a constructor ? - my answer is yes.
2. is it mandatory that i should override the doGet() and doPost() methods ? Can I have a servlet(user defined servlet) without doGet() and doPost() methods ?
3 Suppose I have a userdefined servlet that extends HttpServlet what are the methods that I mandatorily need to override in my user defined servlet ?
4. In the below code :
out.println(getServletContext().getInitParameter("adminEmail"); // assuming adminEmail is a context parameter name defined in web.xml.
I read the explanation in HeadFirst as "Every Servlet inherits a getServletContext() method". I saw in the Servlet and ServletRequest api but didnt find this method there.
I saw this method only in ServletConfig interface.
out.println(getServletContext().getInitParameter("adminEmail"); is nothing but out.println(*this*.getServletContext().getInitParameter("adminEmail"); // whats this here, i mean on which object does the method get invoked ?1. Can a servlet have a constructor ? - my answer is yes.It must have a public default (no-args) constructor, provided either by you or the compiler. No other constructor will be used, so there's no point in writing any constructor as the compiler will do it for you.
2. is it mandatory that i should override the doGet() and doPost() methods ?This question is answered in the [Servlet API|http://java.sun.com/products/servlet/2.5/docs/servlet-2_5-mr2/index.html].
Can I have a servlet(user defined servlet) without doGet() and doPost() methods ?This question is answered in the [Servlet API|http://java.sun.com/products/servlet/2.5/docs/servlet-2_5-mr2/index.html].
3 Suppose I have a userdefined servlet that extends HttpServlet what are the methods that I mandatorily need to override in my user defined servlet ?This question is answered in the [Servlet API|http://java.sun.com/products/servlet/2.5/docs/servlet-2_5-mr2/index.html].
I saw this method only in ServletConfig interface.Which is implemented by GenericServlet, which is the base class for all servlets.
// whats this here, i mean on which object does the method get invoked ?'this' is what it always is. The current object. -
Doubt regarding SHDB transaction
Hi All,
I have a doubt regarding the Process Tab in the application tool bar of SHDB transaction. What is the use of the following check boxes?
1) Default Size
2) Cont.after commit
3) not a batch input session
4) END: Not a Batch Input session
5) Simulate Background modeHi,
Basically these are the properties for CALL TRANSACTION using. You need not worry about these unless you really need those.
1) Default Size: it will set the Default screen size for CALL TRANSACTION USING...
2) Cont.after commit : it will set indicator that CALL TRANSACTION USING... is not completed by COMMIT. after commit also the process will continue
3) not a batch input session: sets indicator that present session is not batch input
4) END: Not a Batch Input session
5) Simulate Background mode : session will be run in foreground. but similar to back grpund
you can see the documentation by placing the cursor on these and click f1. -
I was looking at the "Find my iPhone" app and I have a doubt regarding how it works for the macbook. In order to detect the location, the macbook should remain signed into iCloud. What if the person who has stolen my macbook logs out of iCloud.
It should work fine for iPhone/iPad because we can enable "Restrictions" to prevent the user from signing out of iCloud. Do we have simialr settings for the macbook?
Thanks,If it's not on the device list, it indicates that someone has gone to Find My iPhone on icloud.com and manually deleted it from the device list (as explained here: http://help.apple.com/icloud/#mmfc0eeddd), and it has not gone back online since (which would cause it to reappear on the device list; Find My iPhone has been turned of in settings on the device; the iClolud account has been deleted from the device; or the entire devices has been erased and restored.
Unfortunately, there's no other way to track the phone other than through Find My iPhone. You could call your carrier and see if they would blackliste it so at least the theif couldn't use it. -
Very urgent: Doubts regarding CRM WORKFLOW OF BUSINESS PARTNER CREATION
HI ,
I HAVE DOUBTS REGARDING CRM WORKFLOW OF BUSINESS PARTNER CREATION, WHILE I AM CREATING BUSINESS PARTNER THROUGH R/3 , IT REFLECT IT INTO MYSAP CRM ALSO, AT THAT TIME IT SENDING THE MAIL TWICE TO THE RECEIPIENT. IS THERE ANY WAY THROUGH WHICH I CAN RESTRICT IT TO SEND THE MAIL ONLY ONCE,
PLZ SEND ME THE REPLY AS SOON AS POSSIBLE,
THANKS ADVANCED,HI
WORKFLOW SEETING. SAP MAIL
MULTIPLE MAILS AND
ONLY ONCE CHOOSE
ONLY ONCE OPTION ON WHICH VERSION U R WORKING?
REWARD IF HELPFUL
VENKAT -
Doubt regarding ALE SETTINGS in IDOC scenario.
Hi Friends,
I have some doubts regarding ALE settings for IDOC scenarios, can anyone please clarify my doubts.
For exmaple take IDOC to FILE scenario
The knowledge i got from SDN is --
One need to do at the R3 side is --- RFC DESTINATION (SM59) for the XI system.
--- TRFC PORT for sending IDOC to the XI system
--- CREATING LOGICAL SYSTEM
--- CREATING PARTNER PROFILE
at the XI side is --- RFC Destination ( For SAP sender system)
--- CREATING PORT for receiving IDOC from the SAP sending system(IDX1).
1. Do we create two logical systems for both Sender ( R3 system ) and Receiver( XI system ) in R3 system itself or in XI system or in both systems we create these logical systems? Is this a mandatory step in doing ALE configurations?
In IDOC to IDOC scenario-------
2. Do we craete two RFC destinations in XI system? One RFC DESTINATION for the Sender R3 system and another RFC DESTINATION for the Receiver R3 System? and do we create RFC DESTINATION for the XI system in receiver R3 system? If not.....y we don't create like this........Please give me some clarity on this.............
3. If we use IDOC adapter ,since IDOC adapter resides on the ABAP STACK ,we don't need sender communication channel ,for the similar reason----
y we r creating receiver communication channel in the case of FILE to IDOC scenario?
4. Can any one please provide me the ALE settings for IDOC to FILE scenario,
FILE to IDOC scenario,
IDOC to IDOC scenario individually.
Thanks in advance.
Regards,
Ramana.hi,
1. Yes, we create two logical systems for both Sender ( R3 system ) and Receiver( XI system ) in R3 system itself and
it is a mandatory step in doing ALE configurations
2. We create 1 RFC destination each in R3 and XI.
R3 RFC destination points to Xi and
XI RFC destination points to R3
3 We need to create Communication Channel for Idoc receiver as the receiver channel is always required but sender may not be necessary
4. ALE settings for all IDOC scenarios are same as follows....
Steps for ALE settings:-
Steps for XI
Step 1)
Goto SM59.
Create new RFC destination of type 3(Abap connection).
Give a suitable name and description.
Give the Ip address of the R3 system.
Give the system number.
Give the gateway host name and gateway service (3300 + system number).
Go to the logon security tab.
Give the lang, client, username and password.
Test connection and remote logon.
Step 2)
Goto IDX1.
Create a new port.
Give the port name.
Give the client number for the R3 system.
Select the created Rfc Destination.
Step 3)
Goto IDX2
Create a new Meta data.
Give the Idoc type.
Select the created port.
Steps for R3.
Step 1)
Goto SM59.
Create new RFC destination of type 3(Abap connection).
Give a suitable name and description.
Give the Ip address of the XI system.
Give the system number.
Give the gateway host name and gateway service (3300 + system number).
Go to the logon security tab.
Give the lang, client, username and password.
Test connection and remote logon.
Step 2)
Goto WE21.
Create a port under transactional RFC.(R3->XI)
Designate the RFC destination created in prev step.
Step 3)
Goto SALE.
Basic settings->Logical Systems->Define logical system.
Create two logical systems(one for XI and the other for R3)
Basic settings->Logical Systems->Assign logical system.
Assign the R3 logical system to respective client.
Step 4)
Goto WE20.
Partner type LS.
Create two partner profile(one for XI the other for R3).
Give the outbound or inbound message type based on the direction.
Step 5)
Goto WE19
Give the basic type and execute.
fill in the required fields.
Goto IDOC->edit control records.
Give the following values.(Receiver port,partner no.,part type and sender Partner no. and type)
Click outbound processing.
Step 6)
Go to SM58
if there are any messages then there is some error in execution.
Goto WE02.
Check the status of the IDOC.
Goto WE47.
TO decode the status code.
Step 7)
Not mandatory.
Goto BD64.
Click on Create model view.
Add message type.
BD87 to check the status of IDOC.
In case if not authorized then go to the target system and check in SU53, see for the missing object
and assign it to the user.
SAP r3
sm59(status check)(no message)
WE02(status check)
WE05(status check)
BD87(status check)
Xi
IDx5(Idoc check)
SU53(authorization check)
Reward points if helpful
Prashant
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