Java.util.set: problem with duplicate keys

Hello, everybody,
i have implemented a custom class C with its own equals()-method. I have two instances I1 and I2 of C with
I1.equals(I2) = true
if I add I1 and I2 to a set
Set S = new HashSet();
S.add(I1);
S.add(I2);
there are two elements I1 and I2 in the set. How is this possible?

You must override the method hashCode() of your class C to be consistent with the comparison by equals() method.
http://java.sun.com/j2se/1.4.1/docs/api/java/lang/Object.html#hashCode()

Similar Messages

Java.util.logging - Problem with setting different Levels for each Handler

Hello all,
I am having issues setting up the java.util.logging system to use multiple handlers.
I will paste the relevant code below, but basically I have 3 Handlers. One is a custom handler that opens a JOptionPane dialog with the specified error, the others are ConsoleHandler and FileHandler. I want Console and File to display ALL levels, and I want the custom handler to only display SEVERE levels.
As it is now, all log levels are being displayed in the JOptionPane, and the Console is displaying duplicates.
Here is the code that sets up the logger:
logger = Logger.getLogger("lib.srr.applet");
// I have tried both with and without the following statement
logger.setLevel(Level.ALL);
// Log to file for all levels FINER and up
FileHandler fh = new FileHandler("mylog.log");
fh.setFormatter(new SimpleFormatter());
fh.setLevel(Level.FINER);
// Log to console for all levels FINER and up
ConsoleHandler ch = new ConsoleHandler();
ch.setLevel(Level.FINER);
// Log SEVERE levels to the User, through a JOptionPane message dialog
SRRUserAlertHandler uah = new SRRUserAlertHandler();
uah.setLevel(Level.SEVERE);
uah.setFormatter(new SRRUserAlertFormatter());
// Add handlers
logger.addHandler(fh);
logger.addHandler(ch);
logger.addHandler(uah);
logger.info(fh.getLevel().toString() + " -- " + ch.getLevel().toString() + " -- " + uah.getLevel().toString());
logger.info("Logger Initialized.");Both of those logger.info() calls displays to the SRRUserAlertHandler, despite the level being set to SEVERE.
The getLevel calls displays the proper levels: "FINER -- FINER -- SEVERE"
When I start up the applet, I get the following in the console:
Apr 28, 2009 12:01:34 PM lib.srr.applet.SRR initLogger
INFO: FINER -- FINER -- SEVERE
Apr 28, 2009 12:01:34 PM lib.srr.applet.SRR initLogger
INFO: FINER -- FINER -- SEVERE
Apr 28, 2009 12:01:40 PM lib.srr.applet.SRR initLogger
INFO: Logger Initialized.
Apr 28, 2009 12:01:40 PM lib.srr.applet.SRR initLogger
INFO: Logger Initialized.
Apr 28, 2009 12:01:41 PM lib.srr.applet.SRR init
INFO: Preparing Helper Files.
Apr 28, 2009 12:01:41 PM lib.srr.applet.SRR init
INFO: Preparing Helper Files.
Apr 28, 2009 12:01:42 PM lib.srr.applet.SRR init
INFO: Getting PC Name.
Apr 28, 2009 12:01:42 PM lib.srr.applet.SRR init
INFO: Getting PC Name.
Apr 28, 2009 12:01:42 PM lib.srr.applet.SRR init
INFO: Finished Initialization.
Apr 28, 2009 12:01:42 PM lib.srr.applet.SRR init
INFO: Finished Initialization.Notice they all display twice. Each of those are also being displayed to the user through the JOptionPane dialogs.
Any ideas how I can properly set this up to send ONLY SEVERE to the user, and FINER and up to the File/Console?
Thanks!
Edit:
Just in case, here is the code for my SRRUserAlertHandler:
public class SRRUserAlertHandler extends Handler {
     public void close() throws SecurityException {
     public void flush() {
     public void publish(LogRecord arg0) {
          JOptionPane.showMessageDialog(null, arg0.getMessage());
}Edited by: compbry15 on Apr 28, 2009 9:44 AM

For now I have fixed the issue of setLevel not working by making a Filter class:
public class SRRUserAlertFilter implements Filter {
     public boolean isLoggable(LogRecord arg0) {
          if (arg0.getLevel().intValue() >= Level.WARNING.intValue()) {
               System.err.println(arg0.getLevel().intValue() + " -- " + Level.WARNING.intValue());
               return true;
          return false;
}My new SRRUserAlertHandler goes like this now:
public class SRRUserAlertHandler extends Handler {
     public void close() throws SecurityException {
     public void flush() {
     public void publish(LogRecord arg0) {
          Filter theFilter = this.getFilter();
          if (theFilter.isLoggable(arg0))
               JOptionPane.showMessageDialog(null, arg0.getMessage());
}This is ugly as sin .. but I cannot be required to change an external config file when this is going in an applet.
After much searching around, this logging api is quite annoying at times. I have seen numerous other people run into problems with it not logging specific levels, or logging too many levels, etc. A developer should be able to complete configure the system without having to modify external config files.
Does anyone else have another solution?

TestNG with java.util.Set

hi, i want to test simple method:
@Parameters({"lista"})
@Test
public GroupedFiles groupFiles(Set<File> p_files){
}and i have definition of my xml:
<suite name="My suite">
<parameter name="first-name" value="Cedric"/>
<test name="Simple example">
<-- ... -->and my testNG throws me uknown for me exception:
java.lang.AssertionError: Unsupported type parameter : interface java.util.Set
could anyone help me with this case, thanks for any knowledge

'little code modification'
hi, i want to test simple method:
@Parameters({"lista"})
@Test
public GroupedFiles groupFiles(Set<File> p_files){
}and i have definition of my xml:
<suite name="My suite">
<parameter name="lista" value="java.util.Set"/>
<test name="Simple example">
<-- ... -->and my testNG throws me uknown for me exception:
java.lang.AssertionError: Unsupported type parameter : interface java.util.Set
could anyone help me with this case, thanks for any knowledge

ADF Faces af:table support java.util.Set

I was using a java.util.Set in my model classes, as implementation of the Collection interface. And wanted to show the Set using a <af:table> after a while I discoverded that the documentation did not mention support of java.util.Set, only List.
Now I have to convert my collection to List in the backing beans of my view.
Is there a better approch than converting every Set in the view using
new Arraylist(set)?
And what is the reason of the missing Set support (or General Colelction support)?
Thank you

Deepak, I don't think you know what you're writing about.
No, we do not support java.util.Set in <af:table>. For that matter, neither does <h:dataTable>.
The "why" of it is that we require indexed access into the table for operations like "Display rows 526-550". java.util.Set does not offer indexed access.
By the way, one corollary - do not use java.util.LinkedList with tables (ADF Faces or the JSF data table). If the list is small, then it won't be a problem, but with a large list, you'll get brutal performance.

Mapping problem with compressed key update record

Hi, could you please advise?
I'm getting the following problem:
About a week ago replicat abened with "Error in mapping" error. I found in discard file some record looking like:
filed1 = NULL
field2 =
field3 =
field4 =
field5 =
datefield = -04-09 00:00:00
field6 =
field8 =
field9 = NULL
field10 =
Where filed9 = @GETENV("GGHEADER", "COMMITTIMESTAM"), field10 = = @GETENV("GGHEADER", "COMMITTIMESTAM"), others are table fields mapped by USEDEFAULTS
So I got Mapping problem with compressed key update record at 2012-06-01 15:44
I guess I need to mention that extract failed in 5 minuts before it with: VAM function VAMRead returned unexpected result: error 600 - VAM Client Report <[CFileInfo::Read] Timeout expired after 10 retries with 1000 ms delay, waiting to read transaction log or backup files. To increase the number of retries, use SETENV (GGS_CacheRetryCount = n) in Extract parameter file. To control retry delay time, use SETENV (GGS_CacheRetryDelay = n). handle: 0000000000000398 ReadFile GetLastError:997 Wait GetLastError:997>.
I don't know if it has ther same source as data corruption, could you tell me if it is?
Well, I created new extract, starting 2012-06-01 15:30 to check if there was something with extract at the time, but got the same error.
If I run extract beging at 15:52 it starts and works.
But well, I got another one today. Data didn't look that bad, but yet one column came with null value:( And I'm using it as a key column, so I got Mapping problem with compressed key update record again:(
I'm replicating from SQL Server 2008 to Oracle 11g.
I'm actually using NOCOMPRESSUPDATES in Extract.
CDC is enabled for all tables replicated. The only thing is that it is enabled not by ADD TRANDATA command, but by SQL Server sys.sp_cdc_enable_table, does it matter?
Could you please advise why does it happen?

Well, the problem begins somewhere in extract or before extract, may be in transaction log, I don't know:(
Here are extract parameters:
EXTRACT ETCHECK
TRANLOGOPTIONS MANAGESECONDARYTRUNCATIONPOINT
SOURCEDB TEST, USERID **, PASSWORD *****
exttrail ./dirdat/ec
NOCOMPRESSUPDATES
NOCOMPRESSDELETES
TABLE tst.table1, COLS (field1, field2, field3, field4, field5, field6, field7, field8 );
TABLE tst.table2, COLS (field1, field2, field3, field4 );
Data pump:
EXTRACT DTCHECK
SOURCEDB TEST, USERID **, PASSWORD *****
RMTHOST ***, MGRPORT 7809
RMTTRAIL ./dirdat/dc
TABLE tst.table1;
TABLE tst.table2;
Replicat:
REPLICAT rtcheck
USERID tst, PASSWORD ***
DISCARDFILE ./dirrpt/rtcheck.txt, PURGE
SOURCEDEFS ./dirdef/sourcei.def
HANDLECOLLISIONS
UPDATEDELETES
MAP tst.table1, t.table1, COLMAP (USEDEFAULTS , filed9 = @GETENV("GGHEADER", "COMMITTIMESTAMP"), filed10= @CASE(@GETENV("GGHEADER", "OPTYPE"), "SQL COMPUPDATE", "U", "PK UPDATE", "U",@GETENV("GGHEADER", "OPTYPE")) ), KEYCOLS (field3);
MAP dbo.TPROCPERIODCONFIRMSTAV, TARGET R_019_000001.TPROCPERIODCONFIRMSTAV, COLMAP (USEDEFAULTS , field5 = @GETENV("GGHEADER", "COMMITTIMESTAMP"), filed6= @CASE(@GETENV("GGHEADER", "OPTYPE"), "SQL COMPUPDATE", "U", "PK UPDATE", "U",@GETENV("GGHEADER", "OPTYPE")) ), KEYCOLS (filed1, field2, field3);
Rpt file for replicat:
Oracle GoldenGate Delivery for Oracle
Version 11.1.1.1 OGGCORE_11.1.1_PLATFORMS_110421.2040
Windows x64 (optimized), Oracle 11g on Apr 22 2011 00:34:07
Copyright (C) 1995, 2011, Oracle and/or its affiliates. All rights reserved.
Starting at 2012-06-05 12:49:38
Operating System Version:
Microsoft Windows Server 2008 R2 , on x64
Version 6.1 (Build 7601: Service Pack 1)
Process id: 2264
Description:
** Running with the following parameters **
REPLICAT rtcheck
USERID tst, PASSWORD ***
DISCARDFILE ./dirrpt/rtcheck.txt, PURGE
SOURCEDEFS ./dirdef/sourcei.def
HANDLECOLLISIONS
UPDATEDELETES
MAP tst.table1, t.table1, COLMAP (USEDEFAULTS , filed9 = @GETENV("GGHEADER", "COMMITTIMESTAMP"), filed10= @CASE(@GETENV("GGHEADER", "OPTYPE"), "SQL COMPUPDATE", "U", "PK UPDATE", "U",@GETENV("GGHEADER", "OPTYPE")) ), KEYCOLS (field3);
MAP dbo.TPROCPERIODCONFIRMSTAV, TARGET R_019_000001.TPROCPERIODCONFIRMSTAV, COLMAP (USEDEFAULTS , field5 = @GETENV("GGHEADER", "COMMITTIMESTAMP"), filed6= @CASE(@GETENV("GGHEADER", "OPTYPE"), "SQL COMPUPDATE", "U", "PK UPDATE", "U",@GETENV("GGHEADER", "OPTYPE")) ), KEYCOLS (filed1, field2, field3);
CACHEMGR virtual memory values (may have been adjusted)
CACHEBUFFERSIZE: 64K
CACHESIZE: 512M
CACHEBUFFERSIZE (soft max): 4M
CACHEPAGEOUTSIZE (normal): 4M
PROCESS VM AVAIL FROM OS (min): 1G
CACHESIZEMAX (strict force to disk): 881M
Database Version:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
PL/SQL Release 11.2.0.1.0 - Production
CORE 11.2.0.1.0 Production
TNS for 64-bit Windows: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production
Database Language and Character Set:
NLS_LANG = "AMERICAN_AMERICA.CL8MSWIN1251"
NLS_LANGUAGE = "AMERICAN"
NLS_TERRITORY = "AMERICA"
NLS_CHARACTERSET = "CL8MSWIN1251"
For further information on character set settings, please refer to user manual.
** Run Time Messages **
Opened trail file ./dirdat/dc000000 at 2012-06-05 12:49:39
2012-06-05 12:58:14 INFO OGG-01020 Processed extract process RESTART_ABEND record at seq 0, rba 925 (aborted 0 records).
MAP resolved (entry tst.table1):
MAP tst.table1, t.table1, COLMAP (USEDEFAULTS , filed9 = @GETENV("GGHEADER", "COMMITTIMESTAMP"), filed10= @CASE(@GETENV("GGHEADER", "OPTYPE"), "SQL COMPUPDATE", "U", "PK UPDATE", "U",@GETENV("GGHEADER", "OPTYPE")) ), KEYCOLS (field3);
2012-06-05 12:58:14 WARNING OGG-00869 No unique key is defined for table table1. All viable columns will be used to represent the key, but may not guarantee uniqueness. KEYCOLS may be used to define the key.
Using the following default columns with matching names:
field1=field1, field2=field2, field3=field3, field4=field4, field5=field5, field6=field6, field7=field7, field8=field8
Using the following key columns for target table R_019_000001.TCALCULATE: field3.
2012-06-05 12:58:14 WARNING OGG-01431 Aborted grouped transaction on 'tst.table1', Mapping error.
2012-06-05 12:58:14 WARNING OGG-01003 Repositioning to rba 987 in seqno 0.
2012-06-05 12:58:14 WARNING OGG-01151 Error mapping from tst.table1 to tst.table1.
2012-06-05 12:58:14 WARNING OGG-01003 Repositioning to rba 987 in seqno 0.
Source Context :
SourceModule : [er.main]
SourceID : [er/rep.c]
SourceFunction : [take_rep_err_action]
SourceLine : [16064]
ThreadBacktrace : [8] elements
: [C:\App\OGG\replicat.exe(ERCALLBACK+0x143034) [0x00000001402192B4]]
: [C:\App\OGG\replicat.exe(ERCALLBACK+0x11dd44) [0x00000001401F3FC4]]
: [C:\App\OGG\replicat.exe(<RCALLBACK+0x11dd44) [0x000000014009F102]]
: [C:\App\OGG\replicat.exe(<RCALLBACK+0x11dd44) [0x00000001400B29CC]]
: [C:\App\OGG\replicat.exe(<RCALLBACK+0x11dd44) [0x00000001400B8887]]
: [C:\App\OGG\replicat.exe(releaseCProcessManagerInstance+0x25250) [0x000000014028F200]]
: [C:\Windows\system32\kernel32.dll(BaseThreadInitThunk+0xd) [0x000000007720652D]]
: [C:\Windows\SYSTEM32\ntdll.dll(RtlUserThreadStart+0x21) [0x000000007733C521]]
2012-06-05 12:58:14 ERROR OGG-01296 Error mapping from tst.table1 to tst.table1.
* ** Run Time Statistics ** *
Last record for the last committed transaction is the following:
Trail name : ./dirdat/dc000000
Hdr-Ind : E (x45) Partition : . (x04)
UndoFlag : . (x00) BeforeAfter: A (x41)
RecLength : 249 (x00f9) IO Time : 2012-06-01 15:48:56.285333
IOType : 115 (x73) OrigNode : 255 (xff)
TransInd : . (x03) FormatType : R (x52)
SyskeyLen : 0 (x00) Incomplete : . (x00)
AuditRBA : 44 AuditPos : 71176199289771
Continued : N (x00) RecCount : 1 (x01)
2012-06-01 15:48:56.285333 GGSKeyFieldComp Len 249 RBA 987
Name: DBO.TCALCULATE
Reading ./dirdat/dc000000, current RBA 987, 0 records
Report at 2012-06-05 12:58:14 (activity since 2012-06-05 12:58:14)
From Table tst.table1 to tst.table1:
# inserts: 0
# updates: 0
# deletes: 0
# discards: 1
Last log location read:
FILE: ./dirdat/dc000000
SEQNO: 0
RBA: 987
TIMESTAMP: 2012-06-01 15:48:56.285333
EOF: NO
READERR: 0
2012-06-05 12:58:14 ERROR OGG-01668 PROCESS ABENDING.
Discard file:
Oracle GoldenGate Delivery for Oracle process started, group RTCHECK discard file opened: 2012-06-05 12:49:39
Key column filed3 (0) is missing from update on table tst.table1
Missing 1 key columns in update for table tst.table1.
Current time: 2012-06-05 12:58:14
Discarded record from action ABEND on error 0
Aborting transaction on ./dirdat/dc beginning at seqno 0 rba 987
error at seqno 0 rba 987
Problem replicating tst.table1 to tst.table1
Mapping problem with compressed key update record (target format)...
filed1 = NULL
field2 =
field3 =
field4 =
field5 =
datefield = -04-09 00:00:00
field6 =
field8 =
field9 = NULL
field10 =
Process Abending : 2012-06-05 12:58:14

Mapping problem with compressed key update record (target format)...

Hi Guys,
Getting below error while replication from Source to target. Source table is having NOT NULL Column, but on target replicat process giving error about some NULL value ??
How to overcome this issue, any idea...
2011-08-04 10:35:04 INFO OGG-00995 Oracle GoldenGate Delivery for Oracle, rmastrk.prm: REPLICAT RMASTRK starting.
2011-08-04 10:35:05 INFO OGG-00996 Oracle GoldenGate Delivery for Oracle, rmastrk.prm: REPLICAT RMASTRK started.
2011-08-04 10:35:06 WARNING OGG-00869 Oracle GoldenGate Delivery for Oracle, rmastrk.prm: OCI Error ORA-01407: cannot update ("INFRA"."CUST"."CODE") to NULL (status = 1407), SQL <UPDATE "INFRA"."CUST" SET "ORD_ID" = :a2,"DP_ID" = :a3,"EXCHNG_CODE" = :a4,"ORD_QTY" = :a5,"ORD_PRICE" = :a6,"CODE" = :a7,"MKRT_CODE" = :a8,"CHANN>.
2011-08-04 10:35:06 WARNING OGG-01004 Oracle GoldenGate Delivery for Oracle, rmastrk.prm: Aborted grouped transaction on 'INFRA.CUST', Database error 1407 (ORA-01407: cannot update ("INFRA"."CUST"."SCRP_CODE") to NULL).
2011-08-04 10:35:06 WARNING OGG-01003 Oracle GoldenGate Delivery for Oracle, rmastrk.prm: Repositioning to rba 44132192 in seqno 68708.
2011-08-04 10:35:06 *WARNING OGG-01154 Oracle GoldenGate Delivery for Oracle, rmastrk.prm: SQL error 1407 mapping INFRA.CUST to INFRA.CUST OCI Error ORA-01407:* *cannot update ("INFRA"."CUST"."SCRP_CODE") to NULL (status = 1407), SQL <UPDATE "INFRA"."CUST" SET "ORD_ID" = :a2,"DP_ID" = :a3,"EXCHNG_CODE"=:a4,"ORD_QTY"*
*= :a5,"ORD_PRICE" = :a6,"SCRP_CODE" = :a7,"MKRT_CODE" = :a8,"CHANN>.*
2011-08-04 10:35:06 WARNING OGG-01003 Oracle GoldenGate Delivery for Oracle, rmastrk.prm: Repositioning to rba 44132192 in seqno 68708.
2011-08-04 10:35:06 ERROR OGG-01296 Oracle GoldenGate Delivery for Oracle, rmastrk.prm: Error mapping from INFRA.CUST to INFRA.CUST.
2011-08-04 10:35:06 ERROR OGG-01668 Oracle GoldenGate Delivery for Oracle, rmastrk.prm: PROCESS ABENDING.
Oracle GoldenGate Delivery for Oracle process started, group RMASTRK discard file opened: 2011-08-04 10:35:05
Current time: 2011-08-04 10:35:06
Discarded record from action ABEND on error 1407
OCI Error ORA-01407: cannot update ("INFRA"."CUST"."SCRP_CODE") to NULL
(status = 1407), SQL <UPDATE "INFRA"."CUST" SET "ORD_ID" = :a2,"MKRT_CODE" = :a8,"CHANN>
Aborting transaction on ./dirdat/pm beginning at seqno 68708 rba 44132192
error at seqno 68708 rba 44132192
Problem replicating INFRA.CUST to INFRA.CUST
*Mapping problem with compressed key update record (target format)...*
ORD_QTY = 500
ORD_PRICE = 37430
SCRP_CODE =
MKRT_CODE = N
Oracle GoldenGate Delivery for Oracle process started, group RMASTRK discard file opened: 2011-08-
04 10:35:05
Current time: 2011-08-04 10:35:06
Discarded record from action ABEND on error 1407
OCI Error ORA-01407: cannot update ("INFRA"."CUST"."SCRP_CODE") to NULL
(status = 1407), SQL <UPDATE "INFRA"."CUST" SET "ORD_ID" = :a2,"MKRT_CODE" = :a8,"CHANN>
Aborting transaction on ./dirdat/pm beginning at seqno 68708 rba 44132192
error at seqno 68708 rba 44132192
Problem replicating INFRA.CUST to INFRA.CUST
Mapping problem with compressed key update record (target format)...
ORD_QTY = 500
ORD_PRICE = 37430
SCRP_CODE =
MKRT_CODE = N
Any inputs / help would be appreciated.
Regards,
Manish

The SCRP_CODE column has a NOT NULL constraint. The ORA-01407 error is telling you that you cannot update or set a value for this column to null because of the constraint. This has absolutely nothing to do with an index. You can use a marker/sentinel value in lieu of using NULL. For a numeric field, where everything is positive, a negative value (-1) can be decoded as meaning null. For a character field, a code such as NA can represent NULL.
This also has nothing to do (directly) with GoldenGate failing because of this error. The underlying SQL statement will fail everywhere, regardless of the tool or application. It is not a case of failing only in GoldenGate.

Getting compilation error: java.util.Set is an interface. This interface is not supported.

Hi Folks,
Is there a limitation in BEA's web services implementation? I have a simple web
service that returns an array of java objects. However I am calling another middle
tier API that returns a Set. I convert this Set into array of object and return
it via the web service.
However the .jws file that implements the webservice does not compile. I get the
following error message:
java.util.Set is an interface. This interface is not supported.
Is there a limitation on using Collections within the .jws file? If that is the
case it is a severe limitation.
Note my Web Service API returns an array of java objects with no collections in
them.
Sanjay

Hello,
Generic java collections can only be handled in a very generic, weakly
typed manner.
Take a look at the
http://workshop.bea.com/xmlbeans/guide/conXMLBeansSupportBuiltInSchemaTypes.html
and also
http://workshop.bea.com/xmlbeans/guide/conJavaTypesGeneratedFromUserDerived.html
You might also ask your question to the XMLBeans newsgroup:
http://newsgroups.bea.com/cgi-bin/dnewsweb?cmd=xover&group=weblogic.developer.interest.xmlbeans
Regards,
Bruce
Sanjay wrote:
>
Hi Folks,
Is there a limitation in BEA's web services implementation? I have a simple web
service that returns an array of java objects. However I am calling another middle
tier API that returns a Set. I convert this Set into array of object and return
it via the web service.
However the .jws file that implements the webservice does not compile. I get the
following error message:
java.util.Set is an interface. This interface is not supported.
Is there a limitation on using Collections within the .jws file? If that is the
case it is a severe limitation.
Note my Web Service API returns an array of java objects with no collections in
them.
Sanjay

Failed to unmarshal interface java.util.Set

I am trying to get all mbeans using getAllMBeans() method after
getting MBeanHome successfully. The method fails with the following
error.
Any clues ?
Thanks
karthik
>>>>
weblogic.rmi.extensions.RemoteRuntimeException: Unexpected Exception -
with nested exception:
[java.rmi.UnmarshalException: failed to unmarshal interface
java.util.Set; nested exception is:
     java.io.InvalidClassException: javax.management.MBeanAttributeInfo;
local class incompatible: stream classdesc serialVersionUID =
7043855487133450673, local class serialVersionUID =
8644704819898565848]
     at weblogic.management.internal.AdminMBeanHomeImpl_WLStub.getAllMBeans(Unknown
Source)

I am trying to get all mbeans using getAllMBeans() method after
getting MBeanHome successfully. The method fails with the following
error.
Any clues ?
Thanks
karthik
>>>>
weblogic.rmi.extensions.RemoteRuntimeException: Unexpected Exception -
with nested exception:
[java.rmi.UnmarshalException: failed to unmarshal interface
java.util.Set; nested exception is:
     java.io.InvalidClassException: javax.management.MBeanAttributeInfo;
local class incompatible: stream classdesc serialVersionUID =
7043855487133450673, local class serialVersionUID =
8644704819898565848]
     at weblogic.management.internal.AdminMBeanHomeImpl_WLStub.getAllMBeans(Unknown
Source)

Optimal read write performance for data with duplicate keys

Hi,
I am constructing a database that will store data with duplicate keys.
For each key (a String) there will be multiple data objects, there is no upper limit to the number of data objects, but let's say there could be a million.
Data objects have a time-stamp (Long) field and a message (String) field.
At the moment I write these data objects into the database in chronological order, as i receive them, for any given key.
When I retrieve data for a key, and iterate across the duplicates for any given primary key using a cursor they are fetched in ascending chronological order.
What I would like to do is start fetching these records in reverse order, say just the last 10 records that were written to the database for a given key, and was wondering if anyone had some suggestions on the optimal way to do this.
I have considered writing data out in the order that i want to retrieve it, by supplying the database with a custom duplicate comparator. If I were to do this then the query above would return the latest data first, and I would be able to iterate over the most recent inserts quickly. but Is there a performance penalty paid on writing to the database if I do this?
I have also considered using the time-stamp field as the unique primary key for the primary database instead of the String, and creating a secondary database for the String, this would allow me to index into the data using a cursor join, but I'm not certain it would be any more performant, at least not on writing to the database, since it would result in a very flat b-tree.
Is there a fundamental choice that I will have to make between write versus read performance? Any suggestions on tackling this much appreciated.
Many Thanks,
Joel

Hi Joel,
Using a duplicate comparator will slow down Btree access (writes and reads) to
some degree because the comparator is called a lot during searching. But
whether this is a problem depends on whether your app is CPU bound and how much
CPU time your comparator uses. If you can avoid de-serializing the object in
the comparator, that will help. For example, if you keep the timestamp at the
beginning of the data and only read the one long timestamp field in your
comparator, that should be pretty fast.
Another approach is to store the negation of the timestamp so that records
are sorted naturally in reverse timestamp order.
Another approach is to read backwards using a cursor. This takes a couple
steps:
1) Find the last duplicate for the primary key you're interested in:
cursor.getSearchKey(keyOfInterest, ...)
status = cursor.getNextNoDup(...)
if (status == SUCCESS) {
      // Found the next primary key, now back up one record.
      status = cursor.getPrev(...)
} else {
      // This is the last primary key, find the last record.
      status = cursor.getLast(...)
}2) Scan backwards over the duplicates:
while (status == SUCCESS) {
      // Process one record
      // Move backwards
      status = cursor.getPrev(...)
}Finally another approach is to use a two-part primary key: {string,timestamp}.
Duplicates are not configured because every key is unique. I mention this
because using duplicates in JE has more overhead than using a unique primary
key. You can combine this with either of the above approaches -- using a
comparator, negating the timestamp, or scanning backwards.
--mark

Having problem with dead key in Leopard

Hello. I'm having problem with dead key in Leopard.
In Tiger it was working, but in Leopard dead key "'" doesn't work.
In Tiger I could use OPTION key as well to get Latvian special characters (both worked - OPTION Key and dead-key), but in LEOPARD OPTION key is the only possibility to get these characters.
How can I get dead key "'" working?
I'm using Latvian language with Latvian keyboard layout.
Here are images how it looked in Tiger:
1) Before dead key is pressed:
http://amerix.no-ip.org/tmp/1.tiff
2) After dead key is pressed:
http://amerix.no-ip.org/tmp/2.tiff

ok, i got answer
so - first problem was that ukelele didn't work in leopard (it wasn't possible to start new layout), but it was possible to edit Tom Gewecke posted layout.
There it is possible to change every thing (dead-key as well).
So I edited it and now i have layout where dead-key works -
http://amerix.no-ip.org/tmp/LatvianT.keylayout
Just do what Tom Gewecke said with this layout. It should work!

Puzzled by the redefinition of the methods in java.util.Set

Hi all,
I don't understand why those methods in java.util.Set redefined since their counterparts have alrealdy been defined in java.util.Collection and java.util.Set extends java.util.Collection. I agree to redefine boolean add(Object o) because its contract has been modified, but what about the rest like
size() and iterator() ?
Thanks.

Hi all,
I don't understand why those methods in
in java.util.Set redefined since their counterparts
have alrealdy been defined in java.util.Collection
and java.util.Set extends java.util.Collection. I
agree to redefine boolean add(Object o) because its
contract has been modified, but what about the rest
like
size() and iterator() ?Completeness's sake?
~Cheers

Problems with fuction keys for brightness

i have laptop hp 15 r006tx Product number: G8D30PA#ACJ
i have problems with functions keys for brightness , actually it does't works i can't actually adjust brightness, please help me.....................

OK...
I was right. You have no graphics driver installed for the Intel HD graphics adapter.
I am very surprised you were able to install the nVidia driver because usually you get an error that states you need to install the Intel graphics driver first.
Once you install this driver, the Microsoft Basic Display adapter should be replaced by an Intel HD graphics adapter and you should be able to adjust the screen brightness.
Make sure you have installed this Intel chipset driver first and reboot. If you have done this already, you can skip this step.
http://h10025.www1.hp.com/ewfrf/wc/softwareDownloadIndex?softwareitem=ob-130504-1&cc=us&dlc=en&lc=en...
Next, install the Intel HD graphics driver and reboot. This driver is for W8.1. If you installed W8, you need a different graphics driver.
http://h10025.www1.hp.com/ewfrf/wc/softwareDownloadIndex?softwareitem=ob-130257-1&cc=in&dlc=en&lc=en...

Problem with a key figure restriction

Hi,
I have a problem with one key figure in report: in infocube, this key figure is aggrigated for all the profit centers (summation). In infocube, there is a value '150' for each profit centers (100 pieces) and in the report it is counting 150*100=15000. However, it shouldn't count the sum of all entries in the infocube but show only one value in the report which would be '150'.
I think this should be possible to do but I just don't know how. Hope somebody is able to help me. Thanks in advance.

Hi,
If the values are same for all profit center then change the Profit center infoobject property in the query design to show the maximum values for the 'calculation result as' parameter
Regards,
Vishwa,
Edited by: Vishwanath H.E on Sep 3, 2008 9:19 AM

I'M HAVING PROBLEM WITH FUNCTION KEY, I'M HAVING PROBLEM WITH FUNCTION KEY

Hello everybody
Recently i'm having problem with function key of iphone4, now its working assistive touch key board , between these days i had restored and update then it work for next 12 hour after that it again stoped..
pls help me from this isssue,
thanking you.

There are no function keys on the iPhone.
Please clearly state the issue that is occurring.

Problem with Internet Key Onda Mt835Up: It doesn't work with mac os 10.6.6

Hi I have a problem with internet key Onda MT835UP. It doesn't work, because my imac is more new than internet key.
Can you help me? Can you send me the upgrade for this internet key?
Thanks

I have called Onda, there isn't the driver for Mac OS X 10.6.7 and they don't know if it'll be released.
So if you have a Mac it's better to not buy Onda internet key,
instead it's better to choose other brands that update the drivers of their products.

Java.util.set: problem with duplicate keys

Similar Messages

Maybe you are looking for