Need some help in understanding J2EE

Hi guys,
I have been doing java for the past 3 years... From OOP to WAD (Windows Application Development), however i didn't study EAD (Enterprise Application Development) which teaches J2EE, thus i have no knowledge of J2EE... i have tried to read the J2EE tutorial...but dun realli understand it...can anyone help me by providing some good links to learn J2EE

J2EE defines a framework for server-side applications. It actually "sits" on top of J2SE, and extends the functionality of J2SE by adding services for managing web applications and managing beans that can be persisted/saved.
The J2EE environment "hosts" web applications and persistent Java beans. Web applications run inside a web "container", which handles loading, initializing and dispatching requests to the web application components, and the persistent Java beans are managed by a separate bean container, which handles loading and persisting the beans.
A web application consists of Java servlets, Java Server Pages (JSPs), Java tag libraries (taglibs), and any other Java classes. The persistent beans are called Enterprise Java Beans (EJBs) and are otherwise ordinary Java beans, except that they implement specific interfaces so that the bean container can manage them and allow applications running in remote JVMs to access them.
A server that provides containers for both the web application and the Enterprise Java Beans is called a J2EE application server. One J2EE application server can host multiple web applications. To prevent each application from directly accessing or affecting the other applications on the server, each application runs in its own "context". The context is actually called the servlet context because servlets are the standard Java component for processing requests within a web application.
While I'm sure there are purists who will disagree with me, most applications do not use, nor need to use EJBs, and can be ran comfortably with the web container alone. Tomcat is a J2EE web container you can download for free, and it comes with sample applications you can study. I recommend starting with Tomcat because it's free, it's easy to install, and it is just a web container, without the thousands of irrelevant features that vendors add-on that distract you from really understanding the core technology. Tomcat comes with fairly extensive online help, and there are probably as many books available today for Tomcat as there are for any other web application server, if not more.
I hope this is helpful. There's certainly plenty of information available on the Internet about J2EE, and I've only scratched the surface here. If you have specific questions about J2EE, post them here and I'm sure someone will be able to help you out.
Regards,
James W. Anderson
Alpharetta, Georgia USA
[email protected]

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Hi ,
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Assume i have a Form containing a Button inside a Application Container .
When the Button is clicked on the Form , if i add a Event Listener using this.addEventListener(MouseEvent.click , callMe)
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Please guide me

AddEventListner(MouseEvent.CLICK, callMe, true)

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Hi, I need some help understanding the way materialized views are applied through adpatch.
In patch 1, we have a mv with build mode immediate. When applying it PTS hang due to pool performance of mv refresh.
So we provide patch 2, with that mv build mode deferred, hoping it'll go through. But patch 2 hang too on the same mv.
How does this work? Is that because mv already exists in the database with build immediate, patch 2 will force it to refresh first before changing build mode? How to get over this?
Thanks,
Wei

Hi Hussein,
Thank you for the response.
Application release is 11.5.10.
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-- patch 1 log
Materialized View Name is MSC_PHUB_CUSTOMERS_MV
Materialized View does not exist in the target database
Executing create Statement
Create Statement is
CREATE MATERIALIZED VIEW "APPS"."MSC_PHUB_CUSTOMERS_MV"
ORGANIZATION HEAP PCTFREE 10 PCTUSED 40 INITRANS 10 MAXTRANS 255 LOGGING
STORAGE(INITIAL 4096 NEXT 131072 MINEXTENTS 1 MAXEXTENTS 2147483645
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TABLESPACE "APPS_TS_SUMMARY"
BUILD IMMEDIATE
USING INDEX
REFRESH FORCE ON DEMAND
WITH ROWID USING DEFAULT LOCAL ROLLBACK SEGMENT
DISABLE QUERY REWRITE
AS select distinct
from
dual
AD Worker error:
The above program failed. See the error messages listed
above, if any, or see the log and output files for the program.
Time when worker failed: Tue Feb 02 2010 10:01:46
Manager says to quit.
-- patch 2 log
Materialized View Name is MSC_PHUB_CUSTOMERS_MV
Materialized View does not exist in the target database
Executing create Statement
Create Statement is
CREATE MATERIALIZED VIEW "APPS"."MSC_PHUB_CUSTOMERS_MV"
ORGANIZATION HEAP PCTFREE 10 PCTUSED 40 INITRANS 10 MAXTRANS 255 LOGGING
STORAGE(INITIAL 4096 NEXT 131072 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 4 FREELIST GROUPS 4 BUFFER_POOL DEFAULT)
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BUILD DEFERRED
USING INDEX
REFRESH COMPLETE ON DEMAND
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DISABLE QUERY REWRITE
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Start time for statement above is Tue Feb 02 10:05:06 GMT 2010
Exception occured ORA-00028: your session has been killed
ORA-00028: your session has been killed
ORA-06512: at "APPS.AD_MV", line 116
ORA-06512: at "APPS.AD_MV", line 258
ORA-06512: at line 1
java.sql.SQLException: ORA-00028: your session has been killed
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ORA-06512: at "APPS.AD_MV", line 116
ORA-06512: at "APPS.AD_MV", line 258
ORA-06512: at line 1
Exception occured :No more data to read from socket
AD Run Java Command is complete.
Copyright (c) 2002 Oracle Corporation
Redwood Shores, California, USA
AD Java
Version 11.5.0
NOTE: You may not use this utility for custom development
unless you have written permission from Oracle Corporation.
AD Worker error:
The above program failed. See the error messages listed
above, if any, or see the log and output files for the program.
Time when worker failed: Tue Feb 02 2010 19:51:27
Start time for statement above is Tue Feb 02 12:44:52 GMT 2010
End time for statement above is Tue Feb 02 19:51:29 GMT 2010
Thanks,
Wei

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It sounds like you may have multiple problems, but none of them are likely to be caused by malware.
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http://www.adwaremedic.com/kb/hackedrouter.php
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Need some help with pictures

Hi,
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alanpires wrote:
... this catalogue is both for print and web ...
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Complete Java n00b...need some help

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I'm not really sure how to get started on writing that. I can add up two numbers but I don't know how to tell the program to keep adding additional numbers to that sum. Can someone please help me out? thanks

It's ok... it can be hard to understand even the simplest concepts with only text and no help.
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while (true) {
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Scanner input = new Scanner(System.in);
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class AddNumbers {
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email or IM and helping me get to the point where I have a template
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of my rope =P

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"Flash and XML"
"XML Video Playlist"
"ActionScript 3 XML Basics"
"ActionScript 3 Advanced XML"
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http://www.drheimer.com/video/
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Best wishes,
Adninjastrator

Remote App on iPad connects but drops after about 20 mins. Need to turn off wait about 1 minute then turn on wifi on iMac before it can reconnect. Need some help please.

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Please I need some help.
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Talking Santa didn't update.

Try moving the existing backup file to a safe location so that iTunes has to create an entire new file. The backup file is located here. You can delete that backup once you get a successfull backup.
iTunes places the backup files in the following places:
Mac: ~/Library/Application Support/MobileSync/Backup/
Windows XP: \Documents and Settings\(username)\Application Data\Apple Computer\MobileSync\Backup\
Windows Vista and Windows 7: \Users\(username)\AppData\Roaming\Apple Computer\MobileSync\Backup\
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Need some help in creating Search Help for standard screen/field

I need some help in adding a search-help to a standard screen-field.
Transaction Code - PP01,
Plan Version - Current Plan (PLVAR = '01'),
Object Type - Position ( OTYPE = 'S'),
Click on Infotype Name - Object ( Infotype 1000) and Create.
I need to add search help to fields Object Abbr (P1000-SHORT) / Object Name (P1000-STEXT).
I want to create one custom table with fields, Position Abb, Position Name, Job. Position Abb should be Primary Key. And when object type is Position (S), I should be able to press F4 for Object Abb/Object Name fields and should return Position Abbr and Position Name.
I specify again, I have to add a new search help to standard screen/field and not to enhance it.
This is HR specific transaction. If someone has done similar thing with some other transation, please let me know.
There is no existing search help for these fields. If sm1 ever tried or has an idea how to add new search help to a standard screen/field.
It's urgent.
Thanks in advace. Suitable answers will be rewarded

Hi Pradeep,
Please have a look into the below site which might be useful
Enhancing a Standard Search Help
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/daeda0d7-0701-0010-8caa-
edc983384237
http://help.sap.com/saphelp_nw04/helpdata/en/cf/21ee93446011d189700000e8322d00/frameset.htm
A search help exit is a function module for making the input help process described by the search help more flexible than possible with the standard version.
This function module must have the same interface as function module F4IF_SHLP_EXIT_EXAMPLE. The search help exit may also have further optional parameters (in particular any EXPORTING parameters).
A search help exit is called at certain timepoints in the input help process.
Note: The source text and long documentation of the above-specified function module (including the long documentation about the parameters) contain information about using search help exits.
Function modules are provided in the function library for operations that are frequently executed in search help exits. The names of these function modules begin with the prefix F4UT_. These function modules can either be used directly as search help exits or used within other search help exits. You can find precise instructions for use in the long documentation for the corresponding function module.
During the input help process, a number of timepoints are defined that each define the beginning of an important operation of the input help process.
If the input help process is defined with a search help having a search help exit, this search help exit is called at each of these timepoints. If required, the search help exit can also influence the process and even determine that the process should be continued at a different timepoint.
timepoints
The following timepoints are defined:
1. SELONE
Call before selecting an elementary search help. The possible elementary search helps are already in SHLP_TAB. This timepoint can be used in a search help exit of a collective search help to restrict the selection possibilities for the elementary search helps.
Entries that are deleted from SHLP_TAB in this step are not offered in the elementary search help selection. If there is only one entry remaining in SHLP_TAB, the dialog box for selecting elementary search helps is skipped. You may not change the next timepoint.
The timepoint is not accessed again if another elementary search help is to be selected during the dialog.
2. PRESEL1
After selecting an elementary search help. Table INTERFACE has not yet been copied to table SELOPT at this timepoint in the definition of the search help (type SHLP_DESCR_T). This means that you can still influence the attachment of the search help to the screen here. (Table INTERFACE contains the information about how the search help parameters are related to the screen fields).
3. PRESEL
Before sending the dialog box for restricting values. This timepoint is suitable for predefining the value restriction or for completely suppressing or copying the dialog.
4. SELECT
Before selecting the values. If you do not want the default selection, you should copy this timepoint with a search help exit. DISP should be set as the next timepoint.
5. DISP
Before displaying the hit list. This timepoint is suitable for restricting the values to be displayed, e.g. depending on authorizations.
6. RETURN (usually as return value for the next timepoint)
The RETURN timepoint should be returned as the next step if a single hit was selected in a search help exit.
It can make sense to change the F4 flow at this timepoint if control of the process sequence of the Transaction should depend on the selected value (typical example: setting SET/GET parameters). However, you should note that the process will then depend on whether a value was entered manually or with an input help.
7. RETTOP
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8. EXIT (only for return as next timepoint)
The EXIT timepoint should be returned as the next step if the user had the opportunity to terminate the dialog within the search help exit.
9. CREATE
The CREATE timepoint is only accessed if the user selects the function "Create new values". This function is only available if field CUSTTAB of the control string CALLCONTROL was given a value not equal to SPACE earlier on.
The name of the (customizing) table to be maintained is normally entered there. The next step returned after CREATE should be SELECT so that the newly entered value can be selected and then displayed.
10. APP1, APP2, APP3
If further pushbuttons are introduced in the hit list with function module F4UT_LIST_EXIT, these timepoints are introduced. They are accessed when the user presses the corresponding pushbutton.
Note: If the F4 help is controlled by a collective search help, the search help exit of the collective search help is called at timepoints SELONE and RETTOP. (RETTOP only if the user selects a value.) At all other timepoints the search help exit of the selected elementary search help is called.
If the F4 help is controlled by an elementary search help, timepoint RETTOP is not executed. The search help exit of the elementary search help is called at timepoint SELONE (at the
F4IF_SHLP_EXIT_EXAMPLE
This module has been created as an example for the interface and design of Search help exits in Search help.
All the interface parameters defined here are mandatory for a function module to be used as a search help exit, because the calling program does not know which parameters are actually used internally.
A search help exit is called repeatedly in connection with several
events during the F4 process. The relevant step of the process is passed on in the CALLCONTROL step. If the module is intended to perform only a few modifications before the step, CALLCONTROL-STEP should remain unchanged.
However, if the step is performed completely by the module, the following step must be returned in CALLCONTROL-STEP.
The module must react with an immediate EXIT to all steps that it does not know or does not want to handle.
Hope this info will help you.
***Reward points if found useful
Regards,
Naresh

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GO
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DROP TABLE [dbo].[Table2]
GO
CREATE TABLE [dbo].[Table2] (
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GO
When i converted this DDL script using scratch editor the migration tool gave some errors can anyone help me to resolve below
DECLARE
v_temp NUMBER(1, 0) := 0;
BEGIN
BEGIN
SELECT 1 INTO v_temp
FROM DUAL
WHERE EXISTS ( SELECT *
FROM objects
WHERE OBJECT_ID_ = NULL/*TODO:OBJECT_ID(N'[OPS].[Table1]')*/
AND TYPE IN ( N'U' )
EXCEPTION
WHEN OTHERS THEN
NULL;
END;
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END IF;
END;
CREATE TABLE Table1
test CHAR(10) NOT NULL,
test2 CHAR(10)
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CONSTRAINT Table1_PK PRIMARY KEY( test );
--SQLDEV:Following Line Not Recognized
DECLARE
v_temp NUMBER(1, 0) := 0;
BEGIN
BEGIN
SELECT 1 INTO v_temp
FROM DUAL
WHERE EXISTS ( SELECT *
FROM objects
WHERE OBJECT_ID_ = NULL/*TODO:OBJECT_ID(N'[OPS].[Table2]')*/
AND TYPE IN ( N'U' )
EXCEPTION
WHEN OTHERS THEN
NULL;
END;
IF v_temp = 1 THEN
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END IF;
END;
CREATE TABLE Table2
test2 CHAR(10) NOT NULL
ALTER TABLE Table2
ADD
CONSTRAINT Table2_PK PRIMARY KEY( test2 );
--SQLDEV:Following Line Not Recognized
ALTER TABLE Table1
ADD
CONSTRAINT Table2_Table1_FK1 FOREIGN KEY( test2 ) REFERENCES Table2 (test2)
--SQLDEV:Following Line Not Recognized
;

Pl do not post duplicates - Need some help in debugging this script

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http://wiki.sdn.sap.com/wiki/display/BI/BIUpgradation-HelpfulOSSnotesfromEDWperspective
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Rgs,
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