"not a GROUP BY expression" error when using EclipseLink

I'm using EcliseLink 2.3.0
The follow SQL can be executed successfully.
select to_char(o.taskDate, 'YYYY/MM'), sum(o.plannedHrs) from TaskItem o group by to_char(o.taskDate, 'YYYY/MM');
But the JPQL has an error when it gets excuted.
select FUNC('to_char', o.taskDate, 'YYYY/MM'), sum(o.plannedHrs) from TaskItem o group by FUNC('to_char', o.taskDate, 'YYYY/MM')
ERROR LOG:
Local Exception Stack:
Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.3.0.v20110604-r9504): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLSyntaxErrorException: ORA-00979: not a GROUP BY expression
Error Code: 979
Call: SELECT to_char(TASK_DATE, ?), SUM(PLANNED_HRS) FROM ORA47111.S_PROJ_PLAN_ITEM GROUP BY to_char(TASK_DATE, ?)
     bind => [2 parameters bound]
Query: ReportQuery(referenceClass=TaskItemDAO sql="SELECT to_char(TASK_DATE, ?), SUM(PLANNED_HRS) FROM ORA47111.S_PROJ_PLAN_ITEM GROUP BY to_char(TASK_DATE, ?)")
     at org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:333)
     at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.basicExecuteCall(DatabaseAccessor.java:644)
     at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeCall(DatabaseAccessor.java:535)
     at org.eclipse.persistence.internal.sessions.AbstractSession.basicExecuteCall(AbstractSession.java:1702)
     at org.eclipse.persistence.sessions.server.ServerSession.executeCall(ServerSession.java:566)
     at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:207)
     at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:193)
     at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeSelectCall(DatasourceCallQueryMechanism.java:264)
     at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.selectAllRows(DatasourceCallQueryMechanism.java:646)
     at org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.selectAllRowsFromTable(ExpressionQueryMechanism.java:2592)
     at org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.selectAllReportQueryRows(ExpressionQueryMechanism.java:2535)
     at org.eclipse.persistence.queries.ReportQuery.executeDatabaseQuery(ReportQuery.java:846)
     at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:829)
     at org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:1056)
     at org.eclipse.persistence.queries.ReadAllQuery.execute(ReadAllQuery.java:390)
     at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeInUnitOfWork(ObjectLevelReadQuery.java:1144)
     at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2863)
     at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1501)
     at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1483)
     at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1457)
     at org.eclipse.persistence.internal.jpa.EJBQueryImpl.executeReadQuery(EJBQueryImpl.java:485)
     at org.eclipse.persistence.internal.jpa.EJBQueryImpl.getResultList(EJBQueryImpl.java:742)
     at projapis.projrollup.beans.ManagedTaskItemDAOBean.calcResourcePlannedHrsInMonth(ManagedTaskItemDAOBean.java:329)
     at projapis.projrollup.beans.ManagedTaskItemDAOBean.main(ManagedTaskItemDAOBean.java:522)
Caused by: java.sql.SQLSyntaxErrorException: ORA-00979: not a GROUP BY expression
     at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:440)
     at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:396)
     at oracle.jdbc.driver.T4C8Oall.processError(T4C8Oall.java:837)
     at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:445)
     at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:191)
     at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:523)
     at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:207)
     at oracle.jdbc.driver.T4CPreparedStatement.executeForDescribe(T4CPreparedStatement.java:863)
     at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1153)
     at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1275)
     at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3576)
     at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:3620)
     at oracle.jdbc.driver.OraclePreparedStatementWrapper.executeQuery(OraclePreparedStatementWrapper.java:1491)
     at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeSelect(DatabaseAccessor.java:931)
     at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.basicExecuteCall(DatabaseAccessor.java:607)
     ... 22 more
Any suggestion?
Thanks a lot.
Edited by: sgao on Jul 19, 2011 11:13 PM

Hello,
Unfortunately it is the driver complaining about the SQL that is generated, but I see no major difference from the SQL in the exception:
SELECT to_char(TASK_DATE, ?), SUM(PLANNED_HRS) FROM ORA47111.S_PROJ_PLAN_ITEM GROUP BY to_char(TASK_DATE, ?)
and the SQL you state works other than it looks like JPQL not SQL: select to_char(o.taskDate, 'YYYY/MM'), sum(o.plannedHrs) from TaskItem o group by to_char(o.taskDate, 'YYYY/MM');
Does it work if the SQL in the exception is executed as a native query? Since this the driver complaining about what looks correct, I would look at the driver/database versions to see if there is a later version that might have a bug that has been fixed.
Best Regards,
Chris

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FROM(
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FROM STATISTICS S
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CREATE TABLE STATISTICS(
TIME DATE DEFAULT SYSDATE,
TYPE VARCHAR2(20),
xSIZE VARCHAR2(2),
SOLD NUMBER(5,0) DEFAULT 0
INSERT INTO STATISTICS(TIME, TYPE, xSIZE, SOLD) VALUES(SYSDATE - 2/24, 'T-Shirt', 'M', 10);
INSERT INTO STATISTICS(TIME, TYPE, xSIZE, SOLD) VALUES(SYSDATE - 2/24, 'Socks', 'M', 3);
INSERT INTO STATISTICS(TIME, TYPE, xSIZE, SOLD) VALUES(SYSDATE - 2/24, 'T-Shirt', 'L', 1);
INSERT INTO STATISTICS(TIME, TYPE, xSIZE, SOLD) VALUES(SYSDATE - 2/24, 'Socks', 'L', 50);
INSERT INTO STATISTICS(TIME, TYPE, xSIZE, SOLD) VALUES(SYSDATE - 2/24, 'Trousers', 'XL', 7);
INSERT INTO STATISTICS(TIME, TYPE, xSIZE, SOLD) VALUES(SYSDATE - 2/24, 'Socks', 'XL', 3);
INSERT INTO STATISTICS(TIME, TYPE, xSIZE, SOLD) VALUES(SYSDATE - 1/24, 'T-Shirt', 'M', 13);
INSERT INTO STATISTICS(TIME, TYPE, xSIZE, SOLD) VALUES(SYSDATE - 1/24, 'Socks', 'L', 60);
INSERT INTO STATISTICS(TIME, TYPE, xSIZE, SOLD) VALUES(SYSDATE - 1/24, 'Trousers', 'XL', 15);
INSERT INTO STATISTICS(TIME, TYPE, xSIZE, SOLD) VALUES(SYSDATE - 1/24, 'Socks', 'XL', 6);Edited by: user12047225 on 20.9.2011 23:12
Edited by: user12047225 on 20.9.2011 23:45

It is a known issue when optimizer decides to expand in-line view. You can add something (besides ORDER BY you already used) to in-line view to prevent optimizer from expanding it. For example:
SQL> SELECT TIME,
2          xSIZE,
3          (SOLD - NVL(
4                      (
5                       SELECT SUM(S1.SOLD)
6                         FROM STATISTICS S1
7                         WHERE S1.xSIZE = S.xSIZE
8                           AND TRUNC(S1.TIME, 'HH24') + 1/24 = S.TIME
9                           AND TO_CHAR(S1.TIME, 'HH24') != '23'
10                           AND S1.xSIZE IS NOT NULL
11                           GROUP BY TRUNC(S1.TIME, 'HH24'),
12                                    S1.xSIZE
13                      ),
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15                     )
16          ) SOLD
17    FROM (
18           SELECT TRUNC(S.TIME, 'HH24') TIME,
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21             FROM STATISTICS S
22             WHERE S.xSIZE IS NOT NULL
23             GROUP BY TRUNC(S.TIME, 'HH24'),
24                      S.xSIZE
25           --ORDER BY 1 DESC
26          ) S
27    ORDER BY TIME DESC,
28             xSIZE ASC
29 /
         SELECT TRUNC(S.TIME, 'HH24') TIME,
ERROR at line 18:
ORA-00979: not a GROUP BY expression
SQL> SELECT TIME,
2          xSIZE,
3          (SOLD - NVL(
4                      (
5                       SELECT SUM(S1.SOLD)
6                         FROM STATISTICS S1
7                         WHERE S1.xSIZE = S.xSIZE
8                           AND TRUNC(S1.TIME, 'HH24') + 1/24 = S.TIME
9                           AND TO_CHAR(S1.TIME, 'HH24') != '23'
10                           AND S1.xSIZE IS NOT NULL
11                           GROUP BY TRUNC(S1.TIME, 'HH24'),
12                                    S1.xSIZE
13                      ),
14                      0
15                     )
16          ) SOLD
17    FROM (
18           SELECT TRUNC(S.TIME, 'HH24') TIME,
19                   S.xSIZE,
20                   SUM(S.SOLD) SOLD,
21                   ROW_NUMBER() OVER(ORDER BY SUM(S.SOLD)) RN
22             FROM STATISTICS S
23             WHERE S.xSIZE IS NOT NULL
24             GROUP BY TRUNC(S.TIME, 'HH24'),
25                      S.xSIZE
26           --ORDER BY 1 DESC
27          ) S
28    ORDER BY TIME DESC,
29             xSIZE ASC
30 /
TIME      XS       SOLD
20-SEP-11 L           9
20-SEP-11 M           0
20-SEP-11 XL         11
20-SEP-11 L          51
20-SEP-11 M          13
20-SEP-11 XL         10
6 rows selected.
SQL> Or use subquery factoring (WITH clause) + undocumented hint MATERIALIZE:
SQL> WITH S AS (
2             SELECT /*+ MATERIALIZE */ TRUNC(S.TIME, 'HH24') TIME,
3                     S.xSIZE,
4                     SUM(S.SOLD) SOLD
5               FROM STATISTICS S
6               WHERE S.xSIZE IS NOT NULL
7               GROUP BY TRUNC(S.TIME, 'HH24'),
8                        S.xSIZE
9             --ORDER BY 1 DESC
10            )
11 SELECT TIME,
12          xSIZE,
13          (SOLD - NVL(
14                      (
15                       SELECT SUM(S1.SOLD)
16                         FROM STATISTICS S1
17                         WHERE S1.xSIZE = S.xSIZE
18                           AND TRUNC(S1.TIME, 'HH24') + 1/24 = S.TIME
19                           AND TO_CHAR(S1.TIME, 'HH24') != '23'
20                           AND S1.xSIZE IS NOT NULL
21                           GROUP BY TRUNC(S1.TIME, 'HH24'),
22                                    S1.xSIZE
23                      ),
24                      0
25                     )
26          ) SOLD
27    FROM S
28    ORDER BY TIME DESC,
29             xSIZE ASC
30 /
TIME      XS       SOLD
20-SEP-11 L           9
20-SEP-11 M           0
20-SEP-11 XL         11
20-SEP-11 L          51
20-SEP-11 M          13
20-SEP-11 XL         10
6 rows selected.
SQL> SY.

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where mf.nfx_link = m.MATERIAL_ID
and m.template_id = t.template_id) as Path
looks like min(mf.IP_MATERIALFOLDERID) is having some issues here.. dont know why..
let me know guys..
thanks..
J

A example
with testdata as
select 1 idu, 1 value1, 7 value2, 40 value3 from dual union all
select 2 idu, 2 value1, 8 value2, 45 value3 from dual union all
select 3 idu, 3 value1, 9 value2, 50 value3 from dual union all
select 1 idu, 4 value1, 4 value2, 55 value3 from dual union all
select 2 idu, 5 value1, 5 value2, 60 value3 from dual union all
select 3 idu, 6 value1, 2 value2, 65 value3 from dual
select min(value1), avg(value2), max(value1), sum(value3) from testdata;
MIN(VALUE1) AVG(VALUE2) MAX(VALUE1) SUM(VALUE3)
1 5,83333333333333333333333333333333333333 6 315
Calculate the aggregated functions with all the data of the table.
select idu, min(value1), avg(value2), max(value1), sum(value3) from testdata;
Error SQL: ORA-00937:
00937. 00000 - "not a single-group group function"
Oracle don't know about what values have to calculate the aggrgates functions because there are not aggregated values in the select.
select idu, min(value1), avg(value2), max(value1), sum(value3) from data group by idu;
IDU MIN(VALUE1) AVG(VALUE2) MAX(VALUE1) SUM(VALUE3)
1 1 5,5 4 95
2 2 6,5 5 105
3 3 5,5 6 115
Calculate the aggregated functions in order at idu value.

Error ORA-00979: not a GROUP BY expression

I have to run a query to list the Product_code, stock_level, and the total quantity ordered
The tables are as follows:
PRODUCT:
PRODUCTCODE PRODDESCRIPTION PRICE STOCKLEVEL
p1 carpet 40 10000
p2 tile 20 100000
p3 pergo 50 50000
PRODLINE:
ORDERNUMBER PRODCODE QUANTITY
o1 p1 1000
o1 p2 500
o2 p3 200
o3 p1 600
o3 p3 100
o4 p2 1000
o5 p2 800
Here is my SQL Statement:
SELECT pl.PRODCODE, SUM(pl.QUANTITY), pr.STOCKLEVEL
FROM PRODLINE pl, PRODUCT pr
WHERE pl.PRODCODE=pr.PRODUCTCODE
GROUP BY pl.PRODCODE;
RESULT:
ORA-00979: not a GROUP BY expression
Can someone please assist?

Welconme to the forum!
895231 wrote:
... Here is my SQL Statement:
SELECT pl.PRODCODE, SUM(pl.QUANTITY), pr.STOCKLEVEL
FROM PRODLINE pl, PRODUCT pr
WHERE pl.PRODCODE=pr.PRODUCTCODE
GROUP BY pl.PRODCODE;
RESULT:
ORA-00979: not a GROUP BY expression
Can someone please assist?Remember the ABC's of GROUP BY:
When you use a GROUP BY clause and/or an aggregate fucntion, then everything in the SELECT clause must be:
(A) an Aggregate function,
(B) one of the "group By" expressions,
(C) a Constant, or
(D) something that Depends entirely on the above. (For example, if you "GROUP BY TRUNC(dt)", you can SELECT "TO_CHAR (TRUNC(dt), 'Mon-DD')").
In your query, pr.stocklevel is none of the above.
The previous respondent show how you can make it one of the "group By" expressions, which is noramlly how you would handle this situation.
Alternatively, you could make it an Aggregate function, like this:
SELECT pl.PRODCODE
, SUM (pl.QUANTITY) AS total_quantity
, MIN (pr.STOCKLEVEL) AS stokclevel
FROM PRODLINE pl
, PRODUCT pr
WHERE pl.PRODCODE = pr.PRODUCTCODE
GROUP BY pl.PRODCODE;

Error when use"select case when sum() group by"

SELECT REGION_CODE
,REGION_DESC
,CASE WHEN SUM(UP_SMS_TIMES) BETWEEN T2.SMS_MIN AND T2.SMS_MAX THEN T2.SMS_LVL_CODE END
FROM PMID.TB_MID_PAR_EXT_USER_MON T1, PCDE.TB_CDE_SMS_LVL T2
WHERE DEAL_DATE='200811'
GROUP BY REGION_CODE, REGION_DESC
{color:#ff0000}error:ORA-00979: not a GROUP BY expression
{color}{color:#000000}How can i fix the error,Thanks{color}

-- CREATE TABLE TB_MID_PAR_EXT_USER_MO
create table TB_MID_PAR_EXT_USER_MON
DEAL_DATE CHAR(6),
REGION_CODE CHAR(2),
REGION_DESC VARCHAR2(20),
UP_SMS_TIMES NUMBER(14) default 0,
--INSERT SAMPLE DATA TO TB_MID_PAR_EXT_USER_MO
insert into TB_MID_PAR_EXT_USER_MON(DEAL_DATE,REGION_CODE,REGION_DESC,UP_SMS_TIMES)
VALUES('200812','BJ','BEIJING'11)
insert into TB_MID_PAR_EXT_USER_MON(DEAL_DATE,REGION_CODE,REGION_DESC,UP_SMS_TIMES)
VALUES('200812','SH','SHANGHAI',7)
insert into TB_MID_PAR_EXT_USER_MON(DEAL_DATE,REGION_CODE,REGION_DESC,UP_SMS_TIMES)
VALUES('200812','SH','SHANGHAI',9)
insert into TB_MID_PAR_EXT_USER_MON(DEAL_DATE,REGION_CODE,REGION_DESC,UP_SMS_TIMES)
VALUES('200812','BJ','BEIJING',10)
insert into TB_MID_PAR_EXT_USER_MON(DEAL_DATE,REGION_CODE,REGION_DESC,UP_SMS_TIMES)
VALUES('200812','BJ','BEIJING',5)
insert into TB_MID_PAR_EXT_USER_MON(DEAL_DATE,REGION_CODE,REGION_DESC,UP_SMS_TIMES)
VALUES('200812','BJ','BEIJING',19)
---- CREATE TABLE TB_CDE_SMS_LVL
create table TB_CDE_SMS_LVL
SMS_LVL_CODE INTEGER,
SMS_LVL_DESC VARCHAR2(20),
SMS_MIN NUMBER(14,2),
SMS_MAX NUMBER(14,2)
--INSERT SAMPLE DATA TO TB_CDE_SMS_LVL
INSERT INTO TB_CDE_SMS_LVL(SMS_LVL_CODE,SMS_LVL_DESC,SMS_MIN,SMS_MAX)
VALUES(1,'0 ITEM',-1.00,0.00)
INSERT INTO TB_CDE_SMS_LVL(SMS_LVL_CODE,SMS_LVL_DESC,SMS_MIN,SMS_MAX)
VALUES(2,'0-20 ITEM',0.00,20.00)
INSERT INTO TB_CDE_SMS_LVL(SMS_LVL_CODE,SMS_LVL_DESC,SMS_MIN,SMS_MAX)
VALUES(3,'20-40 ITEM',20.00,40.00)
INSERT INTO TB_CDE_SMS_LVL(SMS_LVL_CODE,SMS_LVL_DESC,SMS_MIN,SMS_MAX)
VALUES(4,'40- ITEM',40.00,9999999.00)
--NOW,LET'S EXEC THE FOLLOWING STATEMENT
SELECT REGION_CODE,REGION_DESC
,MAX(CASE WHEN SUM(UP_SMS_TIMES) BETWEEN T2.SMS_MIN AND T2.SMS_MAX THEN T2.SMS_LVL_CODE END) AS SMS_LVL
FROM PMID.TB_MID_PAR_EXT_USER_MON T1,PCDE.TB_CDE_SMS_LVL T2
WHERE DEAL_DATE='200811' AND UP_SMS_TIMES>0
GROUP BY REGION_CODE, REGION_DESC
--MY REQUIRED RESULT IS
REGION_CODE REGION_DESC SMS_LVL
SH SHANGHAI 2
BJ BEIJING 4
Thanks you!

ORA-00979: not a GROUP BY expression ORA-01722: invalid number error

This is my follwing code:
select isin,nomenclature,sum(total_balance),c_itd_rddt,c_itd_intrrt from
select distinct instru.c_int_isin isin,
instru.c_int_longdesc nomenclature,
to_char(abs(acpos.acp_totbal),
'999999999999,99,99,990.00')total_balance,
c_itd_rddt,
c_itd_intrrt
from cs_instru_t instru,
cs_instrudetls_t insdtls,
cs_acpos_t acpos
where instru.c_int_instruid = insdtls.c_itd_instruid
and acpos.acp_instruid = instru.c_int_instruid
and acpos.acp_acntnum = 'SG030001'
and instru.c_int_instypid in (1)
and insdtls.c_itd_rddt > ('31-Dec-2010')
and instru.c_int_isin not in
(select spsec.c_ssg_isinno from cs_splsecgrp_t spsec) and acpos.acp_totbal!=0
group by instru.c_int_instruid,
instru.c_int_longdesc,
insdtls.c_itd_rddt,
instru.c_int_insstts,
instru.c_int_isin,
insdtls.c_itd_rddt,
acpos.acp_totbal,c_itd_intrrt
--order by extract(year from c_itd_rddt),c_itd_intrrt
union
select c_srm_prntisin isin,c_int_longdesc nomenclature,to_char(abs(acpos.acp_totbal),
'999999999999,99,99,990.00') total_balance,c_itd_rddt,
c_itd_intrrt from cs_instrudetls_t insdtls,cs_strmap_t map,cs_instru_strips instru,cs_acpos_t acpos
where c_int_instruid=c_srm_prncplinsid
and c_itd_instruid=c_int_instruid
and c_srm_prncplinsid=acp_instruid
and acp_acntnum='SG030001'
)view1
group by isin
I want to group by isin only as only isin is same and the rest of the fields are different.But I want to display all the fields.Please Help
I am getting the following errors:
ORA-00979: not a GROUP BY expression
ORA-01722: invalid number

wat abt the other error ora-01722 not a valid number. How to take sum of total_balance which is to_char

Getting an error when using adobe photoshop CC, "Could not move the data because of a program error". Any idea on what this means?

Getting an error when using adobe photoshop CC, "Could not move the data because of a program error". Any idea on what this means?

Have no idea of what you were even doing in Photoshop my crystal ball is out for repairs so I can not see.

RPC Server not Available error when using Windows Fax & Scan under Windows 7

RPC Server not Available error when using Windows Fax & Scan under Windows 7

Hi,
On current situation, please remove the old fax account and re-add a new fax account in Windows Fax and Scan, then check if this issue sill exist. For more details, please refer to following similar thread and artilces.
RPC Server not Available error when using Windows Fax & Scan
under Windows
The local fax account is inaccessible after you rename a Windows Vista-based computer
Cannot send fax from Windows Vista/Windows 7 PC with “RPC Server not Available” error message
Note: Microsoft is providing this information as a convenience to you. The sites are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please
make sure that you completely understand the risk before retrieving any suggestions from the above link.
If any update, please feel free to let me know.
Best regards,
Justin Gu
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Support, contact [email protected]

[svn:bz-trunk] 21394: bug fix for watson 2887837 Not getting duplicate session detected error when same flex client id is used from two different HTTP sessions in CRX .

Revision: 21394
Revision: 21394
Author:   [email protected]
Date:     2011-06-16 12:34:13 -0700 (Thu, 16 Jun 2011)
Log Message:
bug fix for watson 2887837 Not getting duplicate session detected error when same flex client id is used from two different HTTP sessions in CRX.
get the sessions id before we invalidate the duplicate session.
Checkintests pass
Modified Paths:
    blazeds/trunk/modules/core/src/flex/messaging/endpoints/BaseHTTPEndpoint.java

For our profect I think this issue was caused as follows:
Believing that remoting was full asynchronous we fired a 2 or 3 remote calls to the server at the same time ( within the same function ) - usually when the users goes to a new section of the app.
This seemed to trigger the duplicate http session error since according to http://blogs.adobe.com/lin/2011/05/duplication-session-error.html two remote calls arriving before a session is created will cause 2 sessions to be created.
Our current solution ( too early to say it works ) is to daisy chain the multiple calls together .
Also there seemed to be an issue where mobile apps that never quit ( thanks Apple! ) caused the error when activated after a few hours.
I guess the session expires on the server and the error above occurs on activation.
So the mobile apps now ping the server with a remote call when activated after sleeping for more than one hour.
All duplicate http errors are silently caught and reported.
Fingers crossed we won't get any more!

"not a GROUP BY expression" error when using EclipseLink

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