Details about Methods / Classes

Hi,
I want to get complete data about Classes & Methods(Import/Export/Exception etc) in a class. Is there any Function module or table available for the same.
for eg if we want to get details about any particular FM then we can get it using FM FUNCTION_IMPORT_INTERFACE.
Regards

Hello Gaurav
I assume you are looking for method GET_COMPONENT_SIGNATURE of class CL_OO_CLASS (CL_OO_INTERFACE).
Regards
  Uwe

Similar Messages

  • Could you pls give the details about the Unicode conversion during Upgrade

    Hi,
    Can anyone give details about the Unicode conversion during SAP Upgradation fro 4.6C to ECC6.
    Waiting for quick response
    Best Regards,
    Padhy

    Hi,
    These are the few points i gathered during my upgradation project.
    Before starting any upgradation project, it is necessary to take up the back-up of the existing systems. As we are going to upgrade the entire system, we will be changing so many things and if something happens, without back-up, we will be in a trouble.
    So it is advised to keep a back-up of the existing system.
    Say for example we have the existing system E4B which is of Version 4.6C. Now we want to upgrade it to Version 4.7. Let us see how we can do it.
    Version upgrades not only means that we need to run the new Version CD over the existing Version System but only involves some other thing.
    Version Upgrade involves the following Steps.
    Say we want to upgrade for Version 4.7 from Version 4.6, which is in the System E4B. Now we created one more system called as E1B in which the upgradation for Version 4.7 can be done.
    • First copy the entire E4B system into the E1B System which is created for Version 4.7.
    • Apply the Version 4.7 CD provided by SAP over the E1B System.
    • Now check whether all the functionalities that was in E4B system works fine with E1B system also.
    Thus the Version Upgrade involves two steps.
    1. SAP Upgradation with the help of the CD
    2. Manual Upgradation.
    1. SAP Upgradation with the help of the CD
    This is nothing but after taking the copy of the existing system into a new system, the upgradation CD from SAP is applied over the new system.
    2. Manual Upgradation.
    This Manual Upgradation involves
    2.1 Upgradation of Standard Objects
    2.1.1 SPAU Objects
    2.1.2 SPDD Objects
    2.2 Upgradation of Custom Objects.
    Upgradation of Custom Objects can be placed under the following three categories.
    Unicode Compliance
    Retrofit
    Upgrade
    Please Find below some of the common Unicode Errors and their solutions
    1. Error:
    In case of Translate Error; ‘Dangerous use of Translate in Multilingual system.’
    Correction:
    To correct the Error occurring on TRANSLATE statement – use this additional statement before the Translate statement.
    SET LOCALE LANGUAGE sy-langu.
    This statement defines the Text Environment of all the programs & internal sessions in the language specified in the LANGUAGE KEY, which in this case is “sy-langu”, i.e. the log on language of the user.
    2. Error:
    In case of Open Dataset Error; ‘Encoding Addition must be included.’
    Correction:
    This Error occurs only when the MODE is TEXT.
    To correct the Error occurring on OPEN DATASET statement – use this statement instead.
    OPEN DATASET dataset_name FOR access IN TEXT MODE ENCODING DEFAULT.
    Where: dataset_name – NAME OF THE DATASET.
    Access – INPUT or OUTPUT or APPENDING or UPDATE.
    DEFAULT - Corresponds to UTF-8 in UNICODE systems &
    NON_UNICODE in NON-UNICODE systems.
    3. Error:
    In case of the usage of the Obsolete FM UPLOAD/DOWNLOAD or WS_UPLOAD/DOWNLOAD; ‘Function module UPLOAD is flagged as obsolete.’
    Correction:
    The FM GUI_DOWNLOAD/UPLOAD is used.
    The variations to be made in the parameters of the FM:
    1. Filename – It must be of STRING type.
    2. Filetype – “DAT” is not used any longer, instead “ASC” is used.
    3. Field Separator – The default value “SPACE” is used, incase for a TAB separated file “X” can be used.
    4. Error:
    In case of CURRENCY/UNIT Addition Error; ‘Use addition CURRENCY/UNIT when outputting.’
    Correction:
    The CURRENCY addition specifies the currency-dependant decimal places for the output of the data objects of type i or p. To obtain the currency-key, the field CURRKEY of the table TCURX is used. The system determines the number of the decimal places from the field CURRDEC of the selected CURRKEY.
    To correct this error follow the following method:
    WRITE: /3 'TOTAL',' ', TOTAL.
    WRITE: /3 ‘TOTAL’,’ ‘, TOTAL CURRENCY ‘2’. --- Where ‘2’is the Currency Key for Getting 2 decimal places.
    5. Error:
    In case of TYPE X Error; ‘Variable must be of C, N, D, T or STRING type.’
    Correction:
    We need to change all the Type X (Hexadecimal) variables to Type C with their values unchanged.
    So the method to be followed is:-
    1. Load the definition of the class CL_ABAP_CONV_IN_CE or CL_ABAP_CHAR_UTILITIES.
    2. Declare the variable as Type C, and use the method UCCP(‘XXXX’) of the class CL_ABAP_CONV_IN_CE where XXXX represents the 8-bit Hexadecimal value and incase the variable holds a Hex value for a Horizontal Tab , then the Attribute “HORIZONTAL_TAB” of the class CL_ABAP_CHAR_UTILITIES can be used directly instead of using the method UCCP.
    E.g.:
    i) *DATA: TAB TYPE X VALUE 09, “Tab character
    CLASS: CL_ABAP_CHAR_UTILITIES DEFINITION LOAD.
    DATA TAB TYPE C VALUE CL_ABAP_CHAR_UTILITIES=>HORIZONTAL_TAB.
    ii) * DATA: CHAR TYPE X VALUE 160.
    CLASS: CL_ABAP_CONV_IN_CE DEFINITION LOAD.
    DATA CHAR TYPE C.
    CHAR = CL_ABAP_CONV_IN_CE=>UCCP(‘00AO’).
    (Here ‘00A0’ is the Hexadecimal equivalent of the decimal 160).
    3. Incase the TYPE X Variable has a length more than 1, then an internal table must be created for the variable.
    E.g.:
    CLASS: CL_ABAP_CONV_IN_CE DEFINITION LOAD.
    DATA : LF(2) TYPE X VALUE 'F5CD'.
    DATA : BEGIN OF LF,
    A1 TYPE C,
    A2 TYPE C,
    END OF LF.
    LF-A1 = CL_ABAP_CONV_IN_CE=>UCCP('00F5').
    LF-A2 = CL_ABAP_CONV_IN_CE=>UCCP('00CD').
    6. Error:
    In case of the Character “-“Error; ‘The Character “-“can’t appear in names in Unicode Programs.’
    Correction:
    The Character “-“(Hyphen) appearing in Variable names is replaced by the character “_” (Under Score) for Unicode/Upgrade Compliance.
    E.g.:
    *wk-belnr LIKE bkpf-belnr,
    *wk-xblnr LIKE bkpf-xblnr,
    *wk-date LIKE sy-datum,
    *wk-wrbtr LIKE bseg-wrbtr,
    *wk-name1 LIKE lfa1-name1,
    *wk-voucher(8) TYPE c.
    wk_belnr LIKE bkpf-belnr,
    wk_xblnr LIKE bkpf-xblnr,
    wk_date LIKE sy-datum,
    wk_wrbtr LIKE bseg-wrbtr,
    wk_name1 LIKE lfa1-name1,
    wk_voucher(8) TYPE c.
    7. Error:
    In case of The SUBMIT-TO-SAP-SPOOL Error; ‘you should not use the statement SUBMIT-TO-SAP-SPOOL without the WITHOUT SPOOL DYNPRO addition. ‘
    Correction:
    1. Declare variables of type PRI_PARAMS, ARC_PARAMS, and a variable of TYPE C which would be used as a VALID FLAG.
    2. Call the FM GET_PRINT_PARAMETERS:
    CALL FUNCTION 'GET_PRINT_PARAMETERS'
    EXPORTING
    ARCHIVE_MODE = '3'
    DESTINATION = P_DEST
    IMMEDIATELY = 'X'
    IMPORTING
    OUT_ARCHIVE_PARAMETERS = archive_parameters
    OUT_PARAMETERS = print_parameters
    VALID = valid_flag
    EXCEPTIONS
    INVALID_PRINT_PARAMS = 2
    OTHERS = 4
    3. Use the SUBMIT-TO-SAP-SPOOL statement.
    E.g.:
    •     submit zrppt500
    •     using selection-set 'AUTO3'
    •     with res_no eq lo_rsnum
    •     with sreserv in preserv
    •     to sap-spool destination p_dest
    •     immediately 'X'. "print immediate
    DATA: print_parameters type pri_params,
    archive_parameters type arc_params,
    valid_flag(1) type c.
    CALL FUNCTION 'GET_PRINT_PARAMETERS'
    EXPORTING
    ARCHIVE_MODE = '3'
    DESTINATION = P_DEST
    IMMEDIATELY = 'X'
    IMPORTING
    OUT_ARCHIVE_PARAMETERS = archive_parameters
    OUT_PARAMETERS = print_parameters
    VALID = valid_flag
    EXCEPTIONS
    INVALID_PRINT_PARAMS = 2
    OTHERS = 4
    Submit zrppt500
    Using selection-set 'AUTO3'
    With res_no eq lo_rsnum
    with sreserv in preserv
    to sap-spool
    SPOOL PARAMETERS PRINT_PARAMETERS
    ARCHIVE PARAMETERS ARCHIVE_PARAMETERS
    WITHOUT SPOOL DYNPRO.
    8. Error:
    In case of Message Error; ‘Number of WITH fields and number of Place Holders are not same ‘.
    Correction:
    Split the statement after WITH into the same number as the place holder for that Message ID.
    E.g.:
    1. * MESSAGE E045.
    MESSAGE E045 WITH '' ''.
    2. in program ZIPI0801
    •     Start of change for ECC6
    •     message e398(00) with 'Could not find access sequence'
    •     'for condition type:'
    •     p_ptype.
    message e398(00) with 'Could not find '
    'access sequence'
    'for condition type:'
    p_ptype.
    •     End of change made for ECC6
    9. Error:
    In case of Move between 2 different Structures; ‘The structures are not mutually convertible in a Unicode program.’
    Correction:
    Make both the Data Types compatible and then assign the contents.
    E.g.:
    The statement –“move retainage_text to temp_text.” Gives an error, where RETAINAGE_TEXT is an internal table and TEMP_TEXT is a string of length 200.
    A Feasible solution for this is to specify from which position to which position of the string, the fields of RETAINAGE_TEXT should be assigned.
    TEMP_TEXT+0(1) = RETAINAGE_TEXT-DQ1.
    TEMP_TEXT+1(1) = RETAINAGE_TEXT-HEX.
    TEMP_TEXT+2(20) = RETAINAGE_TEXT-FILLER1.
    TEMP_TEXT+22(15) = RETAINAGE_TEXT-AMT_DUE.
    TEMP_TEXT+37(8) = RETAINAGE_TEXT-TEXT.
    TEMP_TEXT+45(10) = RETAINAGE_TEXT-DUE_DATE.
    TEMP_TEXT+55(1) = RETAINAGE_TEXT-DQ2.
    10. Error:
    In case of ‘no description found’; ‘add a GUI title’.
    Correction:
    In this type of error gui title is generally missing so add a GUI title to the module pool.
    11. Error:
    In case of ‘writing internal or transparent table’
    Correction:
    Write individual fields.
    E.g.:
    WRITE: / EXT. --> EXT should be a character type field
    WRITE: / EXT-ZZSTATE, EXT-LINE_NO, EXT-LINE_TXT, EXT-AMT, EXT-ZZSKUQTY.
    12. Error:
    In case of ‘combination reference table/field S541-UMMENGE does not exist’
    Correction:
    Was due to error in reference table S541. TABLE S541 has errors
    1)”Foreign key S541- ZZMARKET (ZZMARKET AND KATR2 point to different domains)”
    2)”Foreign key S541-ZZACQUIGRP (ZZACQUIGRP AND KATR8 point to different domains)”
    Changed the domain of ZZMARKET (from ZMKCODE to ATTR2)
    And that of ZMKCODE (from ZACCODE to ATTR8)
    13. Error:
    In case of ‘KEY does not exist’
    Correction:
    The reference table for field KBETR was KNOV earlier changed it to RV61A as KNOV was in turn referring to RV61A.
    14. Error:
    Incase of ‘WRITE’ statement, ‘Literals that take more than one line is not permitted in Unicode systems.’
    Correction: To correct this error, we need to align the spaces accordingly so that the statement doesn’t go beyond the line.
    15. Error:
    Incase of Data statement, ‘The data type ZWFHTML can be enhanced in any way. After a structure enhancement, this assignment or parameter might be syntactically incorrect………..’
    Correction: To correct this error, instead of “like” in the Data statement, use “type”.
    16. Error:
    Incase of DESCRIBE statement, ‘DESCRIBE can be used only with IN BYTE... Or IN CHARACTER mode in Unicode systems.’
    Correction: To correct this error, use additional text, IN BYTE MODE / IN CHARACTER MODE along with this statement.
    CHARACTER MODE is added when the data object is of flat/ character type.
    BYTE MODE is added when the data object is a deep structure.
    Syntax: DESCRIBE FIELD data_obj : LENGTH blen IN BYTE MODE,
    LENGTH clen IN CHARACTER MODE.
    Where blen and clen must be of type I.
    17. Error:
    Incase of DO-LOOP Error,’ In Do loop range addition needed‘
    Correction:
    An internal tables is declared and the two fields (VARYING field and NEXT field) were
    Included inside the internal table
    E.g.: In program SAPMZP02
    DO 11 TIMES
    •     VARYING STATION_STATE FROM STATION1 NEXT STATION2. “ECC6
    CASE SYST-INDEX.
    WHEN ‘1’
    STATION_STATE = STATION1.
    WHEN ‘2’
    STATION_STATE = STATION2.
    WHEN ‘3’
    STATION_STATE = STATION3.
    WHEN ‘4’
    STATION_STATE = STATION4.
    WHEN ‘5’
    STATION_STATE = STATION5.
    WHEN ‘6’
    STATION_STATE = STATION6.
    WHEN ‘7’
    STATION_STATE = STATION7.
    WHEN ‘8’
    STATION_STATE = STATION8.
    WHEN ‘9’
    STATION_STATE = STATION9.
    WHEN ‘10’
    STATION_STATE = STATION10.
    WHEN ‘11’
    STATION_STATE = STATION11.
    18. Error:
    Incase of the parameter QUEUE-ID Error,’ QUEUE-ID’ is neither a parameter nor a select option in program rsbdcbtc.’
    Correction:
    The parameter in program rsbdcbtc is QUEUE_ID and so is changed in this program
    E.g.: In program Z_CARRIER_EDI_INTERFACE
    •     submit rsbdcbtc with queue-id = apqi-qid and return. "ECC6
    •     The parameter name changed by replacing '-' with '_' as in program rsbdcbtc "ECC6
    Submit rsbdcbtc with queue_id = apqi-qid and return. "ECC6
    19. Error:
    Incase of EPC Error,’ Field symbol <TOT_FLD> is not assigned to a field ‘.
    Correction:
    This error couldn't be rectified as the error occurs in a Standard SAP include- LSVIMF29.
    The OS Note - 1036943 needs to be applied.
    Error:
    OPEN DATASET P_FILE FOR OUTPUT IN TEXT MODE.
    Correct:
    OPEN DATASET P_FILE FOR OUTPUT IN TEXT MODE ENCODING DEFAULT.
    Error:
    Constants : c_tab type x value '09' .
    Correct:
    Constants : c_tab type abap_char1 value cl_abap_char_utilities=>horizontal_tab .
    Error:
    Data : begin of output_options occurs 0 . Include structure ssfcompop.
    Data : end of output_options .
    Correct:
    Data : output_options type standard table of ssfcompop with header line .
    Error:
    PARAMETERS : NAST TYPE NAST .
    Correct:
    PARAMETERS : NAST TYPE NAST NO-DISPLAY .
    Replace WS_DOWNLOAD and WS_UPLOAD by
    GUI_UPLOAD and GUI_DOWNLOAD and check the import and export parameter types , do the changes accordingly. Because FILENAME paramater type is different because of this it will give dump.
    For issue during Issue using SO_NEW_DOCUMENT_ATT_SEND_API1 Function module, the solution is After this FM we should put COMMIT WORK.
    Issue:
    Moving data from one structure to another structure if those two structures are not compatible
    Solution:
    we should use move-corresponding or field by filed we need to move it.
    If database structures are different in 4.6c and ECC6.0,
    Then we should go with append structure concept.
    While testing the report if it gives dump at Select query level or any database or view level,then just goto that table or view and goto the data base utility(se14) adjust the database. But make sure that selected radio button in se14 transaction should be activate and adjust database
    Also Check this link.
    http://help.sap.com/saphelp_nw04/helpdata/en/62/3f2cadb35311d5993800508b6b8b11/frameset.htm
    Reward points if helpful.
    Regards,
    Ramya

  • Need details about "Lock Profiling" tab of JRockit JRA

    Hi,
    I'm experimenting with the JRockit JRA tool: I think this is a very useful tool ! It provides very valuable information.
    About locks ("Lock Profiling" tab), since JRockit manages locks in a very sophisticated manneer, it enables to get very important information about which monitors are used by the application, helping for improving the performances.
    Nevertheless, the BEA categories (thin/fat, uncontended/contended, recursive, after sleep) are not so clear. A short paper explaining what they mean would greatly help.
    Fat contended monitors cost the most, but maybe 10000 thin uncontended locks cost the same as 1 fat contended lock does. We don't know.
    So, there is a lack of information about the cost (absolute: in ms, or relative: 1 fat lock costs as N thin locks) of each kind of monitor. This information would dramaticaly help people searching where improvements of lock management are required in their application.
    Thanks,
    Tony

    great explanation! Thanks
    "ihse" <[email protected]> wrote in message
    news:18555807.1105611467160.JavaMail.root@jserv5...
    About thin, fat, recursive and contended locks in JRockit:
    Let's start with the easiest part: recursive locks. A recursive lock
    occurs in the following scenario:synchronized(foo) {  // first time thread takes lock
    synchronized(foo) {  // this time, the lock is taken recursively
    }The recursive lock taking may also occur in a method call several levels
    down - it doesn't matter. Recursive locks are not neccessarily any sign of
    bad programming, at least not if the recursive lock taking is done by a
    separate method.
    The good news is that recursive lock taking in JRockit is extremely fast.
    In fact, the cost to take a lock recursively is almost negligable. This is
    regardless if the lock was originally taken as a thin or a fat lock
    (explained in detail below).
    Now let's talk a bit about contention. Contention occurs whenever a thread
    tries to take a lock, and that lock is not available (that is, it is held
    by another thread). Let me be clear: contention ALWAYS costs in terms of
    performance. The exact cost depends on many factors. I'll get to some more
    details on the costs later on.
    So if performance is an issue, you should strive to avoid contention.
    Unfortunately, in many cases it is not possible to avoid contention -- if
    you're application requires several threads to access a single, shared
    resource at the same time, contention is unavoidable. Some designs are
    better than others, though. Be careful that you don't overuse
    synchronized-blocks. Minimize the code that has to be run while holding a
    highly-contended lock. Don't use a single lock to protect unrelated
    resources, if that lock proves to be easily contended.
    In principle, that is all you can do as an application developer: design
    your program to avoid contention, if possible. There are some experimental
    flags to change some of the JRockit locking behaviour, but I strongly
    discourage anyone from using these. The default values is carefully
    trimmed, and changing this is likely to result in worse, rather than
    better, performance.
    Still, I understand if you're curious to what JRockit is doing with your
    application. I'll give some more details about the locking strategies in
    JRockit.
    All objects in Java are potential locks (monitors). This potential is
    realized as an actual lock as soon as any thread enters a synchronized
    block on that object. When a lock is "born" in this way, it is a kind of
    lock that is known as a "thin lock". A thin lock has the following
    characteristics:
    * It requires no extra memory -- all information about the lock is stored
    in the object itself.
    * It is fast to take.
    * Other threads that try to take the lock cannot register themselves as
    contending.
    The most costly part of taking a thin lock is a CAS (compare-and-swap)
    operation. It's an atomic instruction, which means as far as CPU
    instructions goes, it is dead slow. Compared to other parts of locking
    (contention in general, and taking fat locks in specific), it is still
    very fast.
    For locks that are mostly uncontended, thin locks are great. There is
    little overhead compared to no locking, which is good since a lot of Java
    code (especially in the class library) use lot of synchronization.
    However, as soon as a lock becomes contended, the situation is not longer
    as obvious as to what is most efficient. If a lock is held for just a very
    short moment of time, and JRockit is running on a multi-CPU (SMP) machine,
    the best strategy is to "spin-lock". This means, that the thread that
    wants the lock continuously checks if the lock is still taken, "spinning"
    in a tight loop. This of course means some performance loss: no actual
    user code is running, and the CPU is "wasting" time that could have been
    spent on other threads. Still, if the lock is released by the other
    threads after just a few cycles in the spin loop, this method is
    preferable. This is what's meant by a "contended thin lock".
    If the lock is not going to be released very fast, using this method on
    contention would lead to bad performance. In that case, the lock is
    "inflated" to a "fat lock". A fat lock has the following characteristics:
    * It requeries a little extra memory, in terms of a separate list of
    threads wanting to acquire the lock.
    * It is relatively slow to take.
    * One (or more) threads can register as queueing for (blocking on) that
    lock.
    A thread that encounters contention on a fat lock register itself as
    blocking on that lock, and goes to sleep. This means giving up the rest of
    its time quantum given to it by the OS. While this means that the CPU will
    be used for running real user code on another thread, the extra context
    switch is still expensive, compared to spin locking. When a thread does
    this, we have a "contended fat lock".
    When the last contending thread releases a fat lock, the lock normally
    remains fat. Taking a fat lock, even without contention, is more expensive
    than taking a fat lock (but less expensive than converting a thin lock to
    a fat lock). If JRockit believes that the lock would benefit from being
    thin (basically, if the contention was pure "bad luck" and the lock
    normally is uncontended), it might "deflate" it to a thin lock again.
    A special note regarding locks: if wait/notify/notifyAll is called on a
    lock, it will automatically inflate to a fat lock. A good advice (not only
    for this reason) is therefore not to mix "actual" locking with this kind
    of notification on a single object.
    JRockit uses a complex set of heuristics to determine amongst other
    things:
    * When to spin-lock on a thin lock (and how long), and when to inflate it
    to a fat lock on contention.
    * If and when to deflate a fat lock back to a thin lock.
    * If and when to skip on the fairness on a contended fat lock to improve
    performance.
    These heuristics are dynamically adaptive, which means that they will
    automatically change to what's best suited for the actual application that
    is being run.
    Since the switch beteen thin and fat locks are done automatically by
    JRockit to the kind of lock that maximizes performance of the application,
    the relative difference in performance between thin and fat locks
    shouldn't really be of any concern to the user. It is impossible to give a
    general answer to this question anyhow, since it differs from system to
    system, depending on how many CPU:s you have, what kind of CPU:s, the
    performance on other parts of the system (memory, cache, etc) and similar
    factors. In addition to this, it is also very hard to give a good answer
    to the question even for a specific system. Especially tricky is it to
    determine with any accuracy the time spent spinning on contended thin
    locks, since JRockit loops just a few machine instuctions a few times
    before giving up, and profiling of this is likely to heavily influence the
    time, giving a skewed image of the performance.
    To summarize:
    If you're concerned about performance, and can change your program to
    avoid contention on a lock - then do so. If you can't avoid contention,
    try to keep the code needed to run contended to a minimum. JRockit will
    then do whatever is in its power to run your progam as fast as possible.
    Use the lock information provided by JRA as a hint: fat locks are likely
    to have been contended much or for a long time. Put your effort on
    minimizing contention on them.

  • To ragnic and other about Singleton class

    Hi ragnic. Thanks for your reply. I posted the code wrong. Heres' my correct one.
    I have a GUI first loaded information and the information is stored in a databse, I have some EJB classes..and my singleton class ABC has some method to access to the EJB..
    so my first GUI will gather info using singleton class and later if I click on
    a button in my first GUI class, will pop up another frame of another class , this class also need to class setPassword in my Singleton..
    are my followign codes correctly??
    iS my Class ABC a SINgleton class? thanks
    Is my class ABC use as single correctly. And It is called from other classes is also correct?
    I'm new to java and like to learn about Singleton class.
    But I really dont' understand it clearly after reading many examples of it.
    I have a project to convert my class abc to a singleton.
    But I dont know how to do it.
    In my class(soon will become a singleton) will have few methods that later I need to use it from another class A and class B.
    I have a GUI application that first load my class A..and my class will call
    class abc(singleton) to get some information from it.
    and then in class A has a button, if I click on that button I will call SIngleton class again to update my password, in the singleton class has method calls updatePassword. But I dont know how to call a singleton from other class.
    I have my code for them below:
    1)public class ABC //attempt using a singleton
    private static ABC theABC = null;
    private ABC(){}
    public synchronized static ABC getABC()
    if(theABC == null)
    theABC= new ABC();
    return the ABC;
    public void updateUserInfo(SimpleUser user)
    throws UserNotFoundException, DelegateException
    try
    UserCollectionHome userCollectionHome = (UserCollectionHome)
    EJBHomeFactory.getFactory().lookupHome("vista/UserCollection",
    UserCollectionHome.class);
    UserHome userHome = (UserHome)
    EJBHomeFactory.getFactory().lookupHome("vista/User",UserHome.class);
    UserCollection uc = userCollectionHome.create();
    uc.updateUserInfo(user, userHome);
    } catch(HomeFactoryException hfe) {
    hfe.printStackTrace();
    throw new DelegateException(hfe);
    } catch(RemoteException re) {
    re.printStackTrace();
    throw new DelegateException(re);
    } catch(CreateException ce) {
    ce.printStackTrace();
    throw new DelegateException(ce);
    } catch(FinderException fe) {
    fe.printStackTrace();
    throw new UserNotFoundException();
    public SimpleUser getID(String id)
    throws UserNotFoundException, DelegateException
    try
    UserCollectionHome userCollectionHome = (UserCollectionHome)
    EJBHomeFactory.getFactory().lookupHome("vista/UserCollection",
    UserCollectionHome.class);
    UserHome userHome = (UserHome)
    EJBHomeFactory.getFactory().lookupHome("vista/User",UserHome.class);
    UserCollection uc = userCollectionHome.create();
    SimpleUser su = uc.getID(id, userHome);
    return su;
    } catch(HomeFactoryException hfe) {
    throw new DelegateException(hfe);
    } catch(RemoteException re) {
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    import java.awt.event.*;
    import javax.swing.*;
    import javax.swing.event.*;
    import javax.swing.border.*;
    import javax.swing.table.*;
    import javax.swing.tree.*;
    import java.util.StringTokenizer;
    import java.util.Vector;
    import java.io.*;
    import javax.swing.text.*;
    import javax.swing.text.html.*;
    import javax.swing.colorchooser.*;
    import javax.swing.filechooser.*;
    import javax.accessibility.*;
    import java.beans.*;
    import java.applet.*;
    import java.net.*;
    import org.apache.log4j.*;
    import com.lockheed.common.gui.GraphicUtilities;
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    import javax.swing.event.*;
    import javax.swing.border.*;
    import java.awt.*;
    import java.awt.event.*;
    import java.util.*;
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    import vista.user.*;
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    import com.lockheed.common.gui.*;
    import com.lockheed.vista.publish.*;
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    pnlVerifyPW.setBorder(BorderFactory.createEmptyBorder(0,63,0,30));
    pnlVerifyPW.add(new JLabel("Verify Password:"));
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    btnCancel = new JButton("Cancel");
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    1. When replying, use <reply>, don't post a new topic.
    2. Implementing a singleton is a frequently asked question. Search before you post.
    3. This is not a question about Swing. A more appropriate forum would be "New To Java Technology" or perhaps "Java Programming", but see point 1.
    4. When posting code, keep it short. It increases the chance of readers looking at it. And in composing your shorter version for the forum, you just may solve your problem.

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