A question that I always want to ask:

Is there anything that have to be done from bytecode level? If you have a answer, please share it with me. Need details.

Is there anything that have to be done from bytecode level?
Your question is vague, but I will do my best. There probably are a few Java exceptions (or errors) that are nearly impossible to demonstrate unless you program at the byte code level and deliberately try to cause such an exception.
In my book, just because you showed that the JVM can have obscure errors does not really accomplish much.
To the best of my knowledge, there is nothing that I know of that involves functionality with other software components that requires you to code at the bytecode level. The Java language exposes the functionality of the JVM to the degree needed to get useful work done. In Java, there is no corresponding concept of, say, operating system device drivers that might require assembler code.
If you really thought that creating the JVM error was somehow the useful result, then I guess that might fall under "anything". More likely, creating such an error would be an academic exercise that no one in industry would pay you for.
I am making assumptions. I am sure some Ph.D. in computer scientist can come up with a counter example to my statement. Here is a thread I participated in where I made a reference to a paper where some graduate students write about generating they own bytecode:
http://forum.java.sun.com/thread.jspa?threadID=606589
You really have qualify your question before I can offer much else.

Similar Messages

The question I've always wanted to ask...

Forms [32 Bit] Version 10.1.2.3.0 (Production)
Why is it, when you are developing in Forms 10g, the canvas colour in my case is grey regardless of what type of canvas it is, the colour remains grey when I run the form with the builder... but when I deploy it on the web, if it is a one canvas form, the colour turns green/blue and even different if the canvas is a tabbed one?
If it is a colour palette, where can I find this and ensure that it is the same one I use in development as well as deployment?
oh and don't get me started on the pink fields it sporadically puts on old forms (6i) which have been upgraded as opposed to 10g ones that are new.

Just been informed by a colleague that the colorScheme is the same as in my directory on my PC as it is on the server.
Here is a subset of formsweb.cfg
>
# Forms applet parameter: URL path to Forms ListenerServlet
serverURL=/forms/lservlet
# Forms applet parameter
codebase=/forms/java
# Forms applet parameter
imageBase=DocumentBase
# Forms applet parameter
width=100%
# Forms applet parameter
height=100%
# Forms applet parameter
separateFrame=True
# Forms applet parameter
splashScreen=splash.gif
# Forms applet parameter
background=
# Forms applet parameter
lookAndFeel=Oracle
# Forms applet parameter
colorScheme=blue
# Forms applet parameter
logo=
# Forms applet parameter

WHY ARE SECURITY QUESTIONS ,THAT I HAVE NEVER BEEN ASKED BEFORE,NEEDED TO DOWNLOAD CONTENT FROM ITUNES ?

IV'E TRIED THIS EVENING TO DOWNLOAD A SONG FROM ITUNES AND SECURITY QUESTIONS THAT I HAVE NEVER BEEN ASKED BEFORE ARE NEEDED TO COMPLETE THE DOWNLOAD. WHY?

The security questions have been added to provide additional security for iTunes Store accounts. You will need to set up the questions and answers now, and provide those answers from time to time.
Regards.
Forum Tip: It is generally considered inappropriate to type all in uppercase letters in Internet discussions, as text that is typed all in uppercase is by convention considered to be shouting. Uppercase is also more difficult to read, so please use all uppercase sparingly and only when you really mean to shout, which we hope you won’t need to do here .

Sync Question that I know has been asked a million times

All,
I had a user that we had to replace the hard drive in his iMac and now we are trying to re sync is iPod Touch back to the computer with the new hard drive.
When we first plug the unit it, it gives the standard "this unit is synced with another iTunes library" error.
Question is I don't want to lose the data (calendar, notes, etc) on the iPod, user doesn't have any music on the device.
How can i sync this Touch back to the 'new' computer without loosing this information?

Found an applicaton called "TouchCopy". I was able to move all of the users Calendar entries and contacts over into the apple iCal and Contact applicatons without any problems. User didnt' have any music as he only uses the device as a PDA only.
I then let itunes do whatever it wanted to do to create an account for the Touch and resync.
User is back up and running.
Very handy little application, take a look at it.
Problem Fixed

Help!I have a question about the Logminer,want to ask everybody to help.

Question: Archived redo log not to recoed DML statements, only to record DDL statements.
问题：归档日志不记录DML，只记录DDL。
Below is a detailed steps operation:
下面是详细的操作步骤：
*1. Install Logminer*
C:\Workspace\GetFiles\bin sqlplus /nolog
SQL*Plus: Release 10.2.0.3.0 - Production on 星期二 7月 12 17:11:49 2011
Copyright (c) 1982, 2006, Oracle. All Rights Reserved.
SQL> conn / as sysdba
已连接。
SQL> @C:\Oracle\product\10.2.0\db_1\RDBMS\ADMIN\dbmslm.sql
程序包已创建。
授权成功。
SQL> @C:\Oracle\product\10.2.0\db_1\RDBMS\ADMIN\dbmslmd.sql
程序包已创建。
*2. Set parameter*
SQL> ALTER SYSTEM SET UTL_FILE_DIR='C:\Oracle\product\10.2.0\db_1\sjjhDict' SCOPE=SPFILE;
系统已更改。
*3. Start archivelog*
SQL> alter database archivelog;
数据库已更改。
*4. View archive mode*
SQL> archive log list
数据库日志模式存档模式(archives mode)
自动存档启用(activated)
存档终点 USE_DB_RECOVERY_FILE_DEST
最早的联机日志序列 10
下一个存档日志序列 12
当前日志序列 12
*5. Create database dict*
SQL> exec sys.dbms_logmnr_d.build(dictionary_filename=>'C:\Oracle\product\10.2.0\db_1\sjjhDict\sjjhDict.ora',dictionary_location=>'C:\Oracle\product\10.2.0\db_1\sjjhDict');
PL/SQL procedure successfully completed
*6. Create table*
CREATE TABLE "NEWS_B"
"NID" NUMBER,
"NTITLE" VARCHAR2(200),
"NTIME" DATE,
"NAUTHOR" NUMBER,
"NCONTENT" VARCHAR2(4000),
PRIMARY KEY ("NID")
*7. Insert data to table*
insert into news_b (NID, NTITLE, NTIME, NAUTHOR, NCONTENT, ROWID)
values (1, '1', to_date('12-07-2011', 'dd-mm-yyyy'), 1, '1', 'AAAMoiAAEAAAABdAAA');
insert into news_b (NID, NTITLE, NTIME, NAUTHOR, NCONTENT, ROWID)
values (2, '2', to_date('12-07-2011', 'dd-mm-yyyy'), 2, '2', 'AAAMoiAAEAAAABdAAB');
insert into news_b (NID, NTITLE, NTIME, NAUTHOR, NCONTENT, ROWID)
values (3, '3', to_date('12-07-2011', 'dd-mm-yyyy'), 3, '3', 'AAAMoiAAEAAAABdAAC');
commit;
*8. Start logminer*
Exec sys.dbms_logmnr.add_logfile('C:\Oracle\product\10.2.0\oradata\hux\REDO01.LOG',sys.dbms_logmnr.NEW);
Exec sys.dbms_logmnr.add_logfile('C:\Oracle\product\10.2.0\oradata\hux\REDO02.LOG',sys.dbms_logmnr.ADDFILE);
Exec sys.dbms_logmnr.add_logfile('C:\Oracle\product\10.2.0\oradata\hux\REDO03.LOG',sys.dbms_logmnr.ADDFILE);
Exec sys.dbms_logmnr.start_logmnr(OPTIONS=>SYS.DBMS_LOGMNR.COMMITTED_DATA_ONLY,DictFileName=>'C:\Oracle\product\10.2.0\db_1\sjjhDict\sjjhDict.ora');
SQL> SELECT SQL_REDO,SQL_UNDO,OPERATION,TIMESTAMP,ROW_ID,SEG_OWNER,SEG_NAME FROM SYS.V_$LOGMNR_CONTENTS WHERE SEG_OWNER='HUX' AND SEG_NAME='NEWS_B';
SQL_REDO SQL_UNDO OPERATION TIMESTAMP ROW_ID SEG_OWNER SEG_NAME
DDL 2011/7/12 1 AAAAAAAAAAAAAAAAAB HUX NEWS_B
CREATE TABLE "NEWS_B"
"NID" NUMBER,
"NTITLE" VARCHAR2(200),
"NTIME" DATE,
"NAUTHOR" NUMBER,
"NCONTENT" VARCHAR2(4000),
PRIMARY KEY ("NID")
SQL>
*9. Execute DDL statements*
SQL> TRUNCATE TABLE NEWS_B;
Table truncated
*10. Again*
SQL> SELECT SQL_REDO,SQL_UNDO,OPERATION,TIMESTAMP,ROW_ID,SEG_OWNER,SEG_NAME FROM SYS.V_$LOGMNR_CONTENTS WHERE SEG_OWNER='HUX' AND SEG_NAME='NEWS_B';
SQL_REDO SQL_UNDO OPERATION TIMESTAMP ROW_ID SEG_OWNER SEG_NAME
DDL 2011/7/12 1 AAAAAAAAAAAAAAAAAB HUX NEWS_B
CREATE TABLE "NEWS_B"
"NID" NUMBER,
"NTITLE" VARCHAR2(200),
"NTIME" DATE,
"NAUTHOR" NUMBER,
"NCONTENT" VARCHAR2(4000),
PRIMARY KEY ("NID")
DDL 2011/7/12 1 AAAAAAAAAAAAAAAAAB HUX NEWS_B
TRUNCATE TABLE NEWS_B
SQL>
*11. LOGGING status*
SQL> select logging from dba_tables t where t.table_name=upper('NEWS_B');
LOGGING
YES
SQL>
Archived redo log not to recoed DML statements, only to record DDL statements. Why?
Please help me!

Archived redo log not to recoed DML statements, only to record DDL statements. Why?This simply isn't true. This may be a bug in your unsupported 10.2.0.3, which needs to be upgraded anyway, but it has always worked.
Also one usually doesn't mine the current open online redologs.
Sybrand Bakker
Senior Oracle DBA

SQL question that's always bugged me

SQL> select * from customer where customer_id = 4;
no rows selected
SQL> select max(customer_id) from customer where customer_id = 4;
MAX(CUSTOMER_ID)
SQL>
WHY!!!!!
This has been driving me nuts, for the past hour or so trying to hunt down a bug in some code, it turned out that due to the max() a function wasn't raising a NO_DATA_FOUND exception and failing elsewhere with an obscure error because of it. after a "select max() into" clause, we have to add an additional check to see if the value it selected into is null or not..... how dumb is that?
ok, I've calmed down now.

Michael:
Both seem quite reasonable to me. Conceptually. ignoring the GROUP BY bit, a COUNT works like:
DECLARE
   l_cnt NUMBER :=0;
BEGIN
   FOR r IN (<query>) LOOP
      l_cnt := l_cnt + 1;
   END LOOP;
   RETURN l_cnt;
END;While a MAX or MIN works like:
DECLARE
   l_max VARCHAR2(4000) := NULL;
   FOR r IN (<query>) LOOP
      IF r.max_col > l_max THEN
        l_max := r.max_col;
      END IF;
   END LOOP;
   RETURN l_max;
END;I'm sure that Oracle has more efficient algorithms, but the point is that the aggregate functions iterate over a result set to generate the result The fact that the result set is empty in some cases doesn't really matter.
Think about what it would mean if some aggregates, like COUNT or SUM, never threw NO_DATA_FOUND, but others like MAX OR MIN did if there were no rows matching the criteria.
In both of your example cases. grouping does take place:
SQL> SELECT COUNT(*) FROM employees;
COUNT(*)
       107
Execution Plan
   0      SELECT STATEMENT Optimizer=CHOOSE (Cost=1 Card=1)
   1    0   SORT (AGGREGATE)
   2    1     INDEX (FULL SCAN) OF 'EMP_EMAIL_UK' (UNIQUE) (Cost=1 Card=107)It is just that the group is all of the records.
John
Message was edited by:
John Spencer
Added the grouping comments.

HT1491 when trying to purchase an app I keep getting redirected to answer security questions that I havent answered before so I dont have the answers to them?

When trying to purchase an app I keep getting redirected to answer security questions that I havent previously been asked so I dont have the answers??

Click here and search the article for '2 out of 3' without the quotes; this generally involves either a message being sent to your rescue email address or contacting the iTunes Store staff directly.
(74327)

Can I send an e-mail to a specific person in Communities? Want to thank them for their answer to a question that I didn't ask. Just wanted to give him/her feedback that their info was very helpful. Just a pat on the back to perhaps brighten their day.

Can I send an e-mail to a specific person in Communities? Want to thank them for their answer to a question that I didn't ask. Just wanted to give him/her feedback that their info was very helpful. Just a pat on the back to perhaps brighten their day.

If you click on the person's name, you go to the public profile they have posted. If there is an email address given you can email directly. If not, you cannot email the person directly.
You could post a reply to the persons reply on the communities to note their help.

Hello, I have a problem. Help me to solve it. The first time I want to buy the game and asks me to answer a security question that I do not remember. Discard them please that I introduced them to

Hello, I have a problem. Help me to solve it. The first time I want to buy the game and asks me to answer a security question that I do not remember. Discard them please that I introduced them to

See Kappy's great User Tips.
See my User Tip for some help: Some Solutions for Resetting Forgotten Security Questions: Apple Support Communities https://discussions.apple.com/docs/DOC-4551
Rescue email address and how to reset Apple ID security questions
http://support.apple.com/kb/HT5312
Send Apple an email request for help at: Apple - Support - iTunes Store - Contact Us http://www.apple.com/emea/support/itunes/contact.html
Call Apple Support in your country: Customer Service: Contacting Apple for support and service http://support.apple.com/kb/HE57
 Cheers, Tom

HT204266 I want to buy the Craigslist pro app and when I sign into iTItem as described and fast shipping! Aunes with my Apple ID and password ( both of which I know) it then asks security questions that I never chose ( or are even options to chose) in my

I want to buy the Craigslist pro app and when I sign into iTItem as described and fast shipping! Aunes with my Apple ID and password ( both of which I know) it then asks security questions that I never chose ( or are even options to chose) in my profile.

If you don't know their answers then if you have a rescue email address (which is not the same thing as an alternate email address) set up on your account then the steps half-way down this page should let you reset them : http://support.apple.com/kb/HT5312
If you don't have a rescue email address (you won't be able to add one until you can answer 2 of your questions) then you will need to contact iTunes Support / Apple to get the questions reset.
Contacting Apple about account security : http://support.apple.com/kb/HT5699
When they've been reset (and if you don't already have a rescue email address) you can then use the steps half-way down the HT5312 link above to add a rescue email address for potential future use

HT5312 I forgot to answer security question that asked me when I want to buy someone in first time.

I forgot to answer security question that asked me when I want to buy someone in first time.

You need to contact Apple, either through the link in that article or by phoning them.
(77231)

I want to buy some music and It is asking some question that I do not have any idea the answer

When I am trying to buy some music iTunes is asking me about some questions that I do not have any idea....

Hello Brandy,
Unfortunately, you can't change or etrieve them by yourself as you forgot the original ones. You may contact iTunes store support though. Here's what you can do:
https://expresslane.apple.com/
Follow these steps:
All Products and Services > iTunes > iTunes Store > Account Management > iTunes Store account security
Answer the questions and if required sign in with your Apple ID and password - same one you used to log in on this support forum.
You will find an option to send an email to Apple on that page. Indicate that you forgot the answers to your security questions and wait for iTunes support to reply.
I hope this helps.

Hello , I want to ask some question about ipads \ How powerful is the iPad? How useful is it for reading books, newspaper or magazines or for surfing the web? Can you identify any shortcomings of the device? please help me :(

Hello ,
I want to ask some question about ipads \
How powerful is the iPad?
How useful is it for reading books, newspaper or magazines or for surfing the web?
Can you identify any shortcomings of the device?
please help me

it's less powerful than your average computer. THink of it like a netbook but with a better processor.
It'll do fine for surfing (although if you browse a lot of flash based sites you will need to get a third party browser since safari doesn't accommodate it)
You may do OK on reading books, papers or magazines, especially if they have apps, but the ipad's screen is backlit, so it doesn't work well outdoors and you may need to fiddle with the brightness so that you don't get eye strain (it's just like doing too much reading from a computer screen)
I would say the biggest short comings are data transfer. Apple's preferred work flow is that everything is done via iTunes or the internet....well people dont' always have 100% reliable always on internet access so you can find yourself in a situation where you can't get things on/off the iPad.
By and large, it's a good device for day to day stuff, but is not a computer replacement.

I want to ask a question but is it supposed to go in this "Ask Your Question" field or should this really be a synopsis or a tersely worded teaser, like a "subject" line?

Oh.
When I pushed the "Ask your question of the community" I got this empty box. But I've already asked my question. Should I copy and paste it into this box?
> I want to ask a question but is it supposed to go in this "Ask Your Question" field or should this really be a synopsis or a tersely worded teaser, like a "subject" line?<
There. Now I have asked the same question, which is of questionable value, for sure, twice. So, if someone answers it, they will get twice the points. Right? Or is there another box for that? Should I paste the question into another box? Twice?
I've been around here for a l-o-n-g time, longer than ol' BenB by several years, so you'd think I'd know better.
Maybe I do.
bogiesan
Message was edited by: David Bogie Chq-1, I blame all misspellings on my iPad's virtual keyboard.

Don't you have a deadline?
Oh, sorry, I thought this was an URGENT query because you have clients waiting.
Keep calm, carry on.

After a tryout with AdBlock, the videos on Facebook, on BBC and on some others websites stopped working and there's always a message asking me to install the latest version of the Flash Player. Even though it's already installed. How can I fix that?

After a tryout with AdBlock, the videos on Facebook, on BBC and on some others websites stopped working and there's always a message asking me to install the latest version of the Adobe Flash Player. Even though it's already installed the situation remains the same since the last month.
Can I fix that just doing the upgrade for the Yosemite?

Well, after hours of trying to figure it out I gave up and un-installed and re-installed that last verion of Adobe Flash Player and now it seems I can play games again in Messenger. Everything else had been fine just that. I can only figure it was because it was having a hard time updating the first time and took me 3 tries. So even though it said it was installed, apparently it wasn't done correctly.
Though when I couldn't figure out what was wrong at first I looked and checked to see all the things were enabled that were supposed to be and they were.
I even tried to go to the Adobe site and download the last version I had and couldn't find it. Kept coming up with the new version. Others said if you download a particular older version it may not have all the security features in it.
This really gets to be a bit much, especially when you're by yourself and have only a smattering of knowledge of technical things.
Thanks fore responding to my question.
DFelice

A question that I always want to ask:

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