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Blocking row navigation in af:table , synchronize row selection with model in case of validation failure- Oracle ADF by Ashish Awasthi

- by JuergenKress

In ADF we often work on editable af:table and when we use af:table to insert ,update or delete data, it is normal to use some validation but problem is when some validation failure occurs on page (in af:table) ,still we can select another row and it shows as currently selected Row this is a bit confusing for user as Row Selection of af:table is not synchronized with model or binding layer See Problem- i have an editable table on page Read the complete article here. WebLogic Partner Community For regular information become a member in the WebLogic Partner Community please visit: http://www.oracle.com/partners/goto/wls-emea ( OPN account required). If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Mix Forum Wiki Technorati Tags: ADF,Ashish Awasthi,WebLogic,WebLogic Community,Oracle,OPN,Jürgen Kress

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Creating an email notification system based on polling database rows

- by Ashish Sharma

I have to design an email notification system based on the following requirements: The email notifications would be created based on polling rows in a Mysql 5.5 DB table when they are in a particular 'Completed' state. The email notification should be sent out in no more than 5 minutes from the time the row was created in the DB table (At the time of DB table row creation the state of the row might not be 'Completed'). Once 5 minutes for the DB table row expire in reaching the 'Completed' state, separate email notification need to be sent (basically telling the user that the original email notification would be delayed) and then sending the email notification as and when the row state reaches to being 'Completed'. The rest of the system requirements are : Adding relevant checks to monitor the whole system via MBeans interface. The system should be scalable so that if the rate of DB table rows creation increases so does the Email notification system be able to ramp up. So I request suggestions on following lines: What approach should I take in solving the problem described from a programming/Design pattern point of view? Suggestion for any third party plugin/software that can be used to solve the problem described? Points to take care regarding scalability and monitoring the health of the system? Java is the language of preference but I am open to using off the shelf components that can be interfaced with Java language or provide standard ports for communication. Currently I do have an in house grown system (written in Java) that is catering to the specified requirements, but it's now crumbling under increased load and now I want to give the problem a fresh look. thanks in advance Ashish

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List of mail servers using DKIM, SPF and SenderID

- by Ashish

Hi, I am setting up Postfix mail server. What I want to know is that, what the popular mail server's like yahoo, gmail, AOL, Microsoft Outlook server etc. use for sender identification of e-mails. e.g: Which one use SPF or DKIM or SenderId etc. Any listing enumerating about these properties would be highly useful. Thanks in advance Ashish

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Determine whether a link points to a file on local host or foreign domain [migrated]

- by user107157

This has been a burning question for me ever since and I think it's interesting enough to discuss it on the forums. As most will know, in websites we include anchor links, stylesheets, script files (javascript) and images. For anchor links we use the form <a href="..." /> For stylesheets we may use the form <link rel="stylesheet" type="text/css" href="..." /> For javascript we may use <script src="..." /> For images we use <img src="..." /> So, the question is this: How do we know that what is in the link pointer (i.e. replacing the ... in each example) is a local file or a foreign entity? To make it clear, lets say I create a local file named "ashish.com". Now, my purpose is to create a link so that anybody who clicks on it may download it. So, my code would be thus: <a href="ashish.com">Download It</a> But this makes it ambiguous. I could also be referring to a website named "ashish.com" So, how does the computer magically know which one I mean? Or does it even know this? What would happen in such a scenario?

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setting rpmforge repository for Linux (RHEL)

- by Ashish

Hello, I had a Linux centos(5.5) machine, on this i had deployed amavisd (with clamav and spamassassin). Referred these: http://wiki.centos.org/HowTos/Amavisd http://wiki.centos.org/PackageManagement/Yum/Priorities Now I have a linux RHEL machine, details are as follows: (Linux version 2.6.18-164.6.1.el5 ([email protected]) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-46)) x86_64 GNU/Linux Red Hat Enterprise Linux Server release 5.5 (Tikanga)) I want to set up the above mentioned software's on this(RHEL) machine, for that I do (as per the reference link): install yum-priorities but i am unable to install this on my said machine, because the default yum repository provided by RHEL doesn't contain this. How can i deploy the above software's on my RHEL machine, suggest any safe alternate. Please guide since i am a newbie in this matter. thanks in advance Ashish Sharma

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Validate a string in a table in SQL Server - CLR function or T-SQL

- by Ashish Gupta

I need to check If a column value (string) in SQL server table starts with a small letter and can only contain '_', '-', numbers and alphabets. I know I can use a SQL server CLR function for that. However, I am trying to implement that validation using a scalar UDF and could make very little here...I can use 'NOT LIKE', but I am not sure how to make sure I validate the string irrespective of the order of characters or in other words write a pattern in SQL for this. Am I better off using a SQL CLR function? Any help will be appreciated.. Thanks in advance Thank you everyone for their comments. This morning, I chose to go CLR function way. For the purpose of what I was trying to achieve, I created one CLR function which does the validation of an input string and have that called from a SQL UDF and It works well. Just to measure the performance of t-SQL UDF using SQL CLR function vs t- SQL UDF, I created a SQL CLR function which will just check if the input string contains only small letters, it should return true else false and have that called from a UDF (IsLowerCaseCLR). After that I also created a regular t-SQL UDF(IsLowerCaseTSQL) which does the same thing using the 'NOT LIKE'. Then I created a table (Person) with columns Name(varchar) and IsValid(bit) columns and populate that with names to test. Data :- 1000 records with 'Ashish' as value for Name column 1000 records with 'ashish' as value for Name column then I ran the following :- UPDATE Person Set IsValid=1 WHERE dbo.IsLowerCaseTSQL (Name) Above updated 1000 records (with Isvalid=1) and took less than a second. I deleted all the data in the table and repopulated the same with same data. Then updated the same table using Sql CLR UDF (with Isvalid=1) and this took 3 seconds! If update happens for 5000 records, regular UDF takes 0 seconds compared to CLR UDF which takes 16 seconds! I am very less knowledgeable on t-SQL regular expression or I could have tested my actual more complex validation criteria. But I just wanted to know, even I could have written that, would that have been faster than the SQL CLR function considering the example above. Are we using SQL CLR because we can implement we can implement lot richer logic which would have been difficult otherwise If we write in regular SQL. Sorry for this long post. I just want to know from the experts. Please feel free to ask if you could not understand anything here. Thank you again for your time.

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Lucene .Net Searching with TermVector

- by Ashish

in Lucene.Net,i am creating the document for searching a word and want to display before 10 words and after 10 words.i have used TermVector. Lucene.Net.Documents.Field fldContent = new Lucene.Net.Documents.Field("content", content, Lucene.Net.Documents.Field.Store.YES, Lucene.Net.Documents.Field.Index.TOKENIZED, Lucene.Net.Documents.Field.TermVector.WITH_POSITIONS_OFFSETS); Can anyone help me how to find out the keyword position and extract nearest 15 words. please send some code. Thanks Ashish

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Restoring/Restarting a java daemon from crash

- by Ashish

Hello, I am running a java app as daemon on a linux machine using a customized shell script. Since I am new to java and linux, I want to know is it possible that the app itself resurrects itself(just like restart) and recovers from cases like app crashing, unhandled exceptions or out of memory etc. thanks in advance Ashish Sharma

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how to perform proper indexing and searching in Lucene.Net

- by Ashish

Dear All, I have a list of all words in the document. I want to index it and latter I want to retrieve a particular word and some near by words (10 words before the result and 10 words after the result). What is the proper way of indexing and searching in Lucene.net? Please reply me as soon as possible. Thanking you, Ashish

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How to get the updated version in click once deployment

- by Ashish

Hi , I have an application deployed with ClickOnce .Now when i rebuild the application with some changes , and put it in the share folder from where it is installed and launch the appluication it doesnt takes the latest version instead it just launches the old version. How should i check (which file) for new version. is there any setting in the build file which says to check the new version. Can somebodyy pleas help me with this?? thanks, ashish.

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Connecting arduino to internet across firewall proxy

- by Ashish

Hello, I have an arduino with an ethernet shield. I want to know how can i connect it to internet across a firewall proxy. Please give me some sample code also. thanks in advance Ashish

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Streaming and conversion of video from 3rd Parth

- by Ashish

Hi, I am working on a App where video has to be displayed.All these video are in .flv format, Is there any mechanism by using that I can convert this video to .mov or .m4v (supported by iphone) on the fly, so that user can view those video on their iphone or ipod. Thanks, Ashish

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Asp.net MVC dynamic generated Text Boxes

- by Ashish

I am creating a page with with some Text Boxes that are generated dynamically. Ids' of all text boxes are also generated at run time. I want to send all text boxes value to my controller and save that data. How I get all text boxes value. I may use javascript or JQuery. Can anyone suggest me? Thanks in advance.. Ashish

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Validate a string in a table in SQL Server - CLR function or T-SQL (Question updated)

- by Ashish Gupta

I need to check If a column value (string) in SQL server table starts with a small letter and can only contain '_', '-', numbers and alphabets. I know I can use a SQL server CLR function for that. However, I am trying to implement that validation using a scalar UDF and could make very little here...I can use 'NOT LIKE', but I am not sure how to make sure I validate the string irrespective of the order of characters or in other words write a pattern in SQL for this. Am I better off using a SQL CLR function? Any help will be appreciated.. Thanks in advance Thank you everyone for their comments. This morning, I chose to go CLR function way. For the purpose of what I was trying to achieve, I created one CLR function which does the validation of an input string and have that called from a SQL UDF and It works well. Just to measure the performance of t-SQL UDF using SQL CLR function vs t- SQL UDF, I created a SQL CLR function which will just check if the input string contains only small letters, it should return true else false and have that called from a UDF (IsLowerCaseCLR). After that I also created a regular t-SQL UDF(IsLowerCaseTSQL) which does the same thing using the 'NOT LIKE'. Then I created a table (Person) with columns Name(varchar) and IsValid(bit) columns and populate that with names to test. Data :- 1000 records with 'Ashish' as value for Name column 1000 records with 'ashish' as value for Name column then I ran the following :- UPDATE Person Set IsValid=1 WHERE dbo.IsLowerCaseTSQL (Name) Above updated 1000 records (with Isvalid=1) and took less than a second. I deleted all the data in the table and repopulated the same with same data. Then updated the same table using Sql CLR UDF (with Isvalid=1) and this took 3 seconds! If update happens for 5000 records, regular UDF takes 0 seconds compared to CLR UDF which takes 16 seconds! I am very less knowledgeable on t-SQL regular expression or I could have tested my actual more complex validation criteria. But I just wanted to know, even I could have written that, would that have been faster than the SQL CLR function considering the example above. Are we using SQL CLR because we can implement we can implement lot richer logic which would have been difficult otherwise If we write in regular SQL. Sorry for this long post. I just want to know from the experts. Please feel free to ask if you could not understand anything here. Thank you again for your time.

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KeyPressed working on N95 but not woking on N86 etc

- by awaghad-ashish

I have a customItem in my application and I am using keypressed event for it. Until now, I have been testing my application on N95 and it works perfectly there but the same keypressed event is not working on other nokia phones such as N86 and ExpressMusic. Does anybody know what the issue is. Thanks and regards, Ashish.

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How to close a dialouge box from some custom link inside the dialouge box

- by Ashish

Hi, I have custom control which i am rendering inside dailouge box. this custom control has a link lable lnkLable. I want to close the opened window when i click on lnkLable. right now i am finding the parent of my conrol which will be dialouge control in the end and then calling the dispose method of that, which i dont feel very good technique to do this. Thanks in advance for your help/suggestions. regards, ashish kalia

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postfix Mail filters not running behind a controlled enviornment

- by Ashish

Hi, I have deployed a postfix server for email receiving. On this I have configured SenderID + SPF milter, by referring to http://www.postfix.org/MILTER_README.html The command that I used is as follows: ./sid-filter -u postfix -p inet:10027@localhost -l Following are my settings in main.cf file: #Milter support for smtpd mail smtpd_milters = inet:localhost:10027, inet:localhost:10028 # Milters for non-SMTP mail. non_smtpd_milters = inet:localhost:10027, inet:localhost:10028 milter_default_action = reject # Postfix . 2.6 #milter_protocol = 6 # 2.3 . Postfix . 2.5 milter_protocol = 2 Now I have this observation: One of the postfix that is setup on AWS CentOS 5.5 is working fine and is able to receive mails on defined mx record. One of the similar postfix(as in step 1) that is setup behind one of the corporate firewalls is not able to receive any mails and is giving following type of error logs: connect from xxxxxx.austin.hp.com[xx.xxx.96.198] May 25 13:20:02 g2t0385g postfix/smtpd[11733]: C11F9B0194: client=xxxxxxx.austin.hp.com[15.217.96.198] May 25 13:20:03 g2t0385g postfix/cleanup[11814]: C11F9B0194: message-id= May 25 13:20:03 g2t0385g postfix/cleanup[11814]: C11F9B0194: milter-reject: END-OF-MESSAGE from xxxxxx.austin.hp.com[xx.xxx.96.198]: 5.7.1 Command rejected; from= to= proto=ESMTP helo= Here the 'sid-filter' is giving problems. Any idea, what I am doing wrong? Please help. Thanks in advance Ashish Sharma

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Problem installing g++ ccompiler on Ubuntu 14.04

- by Yash Agarwal

I tried to install g++ using packages from another user. offline..but there were errors. After connecting to the net I tried to install using sudo apt-get install g++, but it gave the following output: gstreamer0.10-alsa is already the newest version. qtdeclarative5-ubuntu-ui-extras-browser-plugin is already the newest version. python-gconf is already the newest version. gstreamer0.10-tools is already the newest version. libglib2.0-0 is already the newest version. gir1.2-peas-1.0 is already the newest version. libatk-bridge2.0-0 is already the newest version. gnome-session-bin is already the newest version. libgomp1 is already the newest version. libmessaging-menu0 is already the newest version. usb-creator-gtk is already the newest version. libgnome-desktop-3-7 is already the newest version. software-properties-gtk is already the newest version. gnome-control-center-shared-data is already the newest version. unity-scope-gourmet is already the newest version. libcupsimage2 is already the newest version. growisofs is already the newest version. libjson-glib-1.0-common is already the newest version. activity-log-manager is already the newest version. libio-string-perl is already the newest version. qtdeclarative5-qtfeedback-plugin is already the newest version. gnome-power-manager is already the newest version. 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. and many more lines like this....but g++ is still not installed

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Benefit of using Data URI to embed images within HTML document and its cross-browser compatibility

- by Manoj Agarwal

I want to embed an image using Data URI within HTML document so that we don't need image as a separate attachment, we get just one HTML file that contains the actual image. What are its advantages and disadvantages? Does IE10 supports it? Is it useful to have such an implementation? I am working on an application, where we have html documents that link towards images stored in some location. If I use tiny online editor, as images are saved somewhere in the server, while editing the document, i can provide a link towards that image, but can't preview the final document with images from within tiny editor. If I chose to download the file locally, then i will need to download the images from server side. It looks a bit overkill, so I thought if Data URI could be used in such a situation.

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What are algorithmic paradigms?

- by Vaibhav Agarwal

We generally talk about paradigms of programming as functional, procedural, object oriented, imperative etc but what should I reply when I am asked the paradigms of algorithms? For example are Travelling Salesman Problem, Dijkstra Shortest Path Algorithm, Euclid GCD Algorithm, Binary search, Kruskal's Minimum Spanning Tree, Tower of Hanoi paradigms of algorithms? Should I answer the data structures I would use to design these algorithms?

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Screen Resolution stuck at 640x480 after installing Bumblebee

- by Saurabh Agarwal

I have a Dell XPS 15z laptop. As you can see here, there are some issues with NVidia drivers. The site recommends installation of Bumblebee (instructions given in the link). I am posting it again for ease: $ sudo add-apt-repository ppa:bumblebee/stable $ sudo apt-get update && sudo apt-get upgrade $ sudo apt-get install bumblebee bumblebee-nvidia $ sudo usermod -a -G bumblebee $USER After restarting the computer however, the screen resolution was stuck at 640x480 and I got the following error message as soon as I logged in: **Could not apply the stored configuration for monitors** none of the selected modes were compatible with the possible modes: Trying modes for CRTC 63 CRTC 63: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 0) CRTC 63: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 1) Trying modes for CRTC 64 CRTC 64: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 0) CRTC 64: trying mode 640x480@60Hz with output at 1366x768@60Hz (pass 1) Prior to the update, the display was absolutely normal and thus there is no doubt about the cause. Albeit, there was no support for graphic drivers. In case it helps, some features of graphics drivers seem to be functional after bumblebee, ie, all features are in order except for the resolution. And if the resolution can't be fixed, please suggest a way to retract the changes so that atleast the prior state may be reachieved. Any help in the matter would be highly appreciated.

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How to start competitive programming?

- by Vaibhav Agarwal

I am practicing coding for a while but the problem is that it takes me a lot of time to write a solution for the problems. I want to ask if competitive programming can help me in improving this? If yes, then how should I start and from what site like TopCoder? I would obviously won't be able to solve very hard problems for now. What should I do? If no, what else should I do? I also have another problem that I want to learn coding but the thing is that I feel that I am not very good at it. What should I do? It's like bugging me from inside. I know some people may not find this question informative but please at least allow me to get an answer.

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Recovering data from hard disk after an accidental Ubuntu reinstallation

- by Saurabh Agarwal

My computer got wiped accidentally due to a fresh Ubuntu installation. Since the drive contains very important data and codes, it would be really great if the same could be recovered. It is a 2TB hard drive which had Ubuntu 10.10 earlier. It now has a Ubuntu 12.04 installed on it (which I understand occupies ~4GB). The machine has been powered off since. The installation was done using a usb with the option where the previous ubuntu installation is removed. Since installation doesn't take a lot of time, I'm inclined to think that the disk wasn't completely formatted and that most of the data is still there. I have no experience with recovery and hence a detailed explanation is very helpful. NOTE: I can arrange an additional 2TB hard disk for copying data. My computer has a fast internet connection and I have other computers connected to the network which I may use to access the previous one as well.

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Making a design for a Problem [closed]

- by Vaibhav Agarwal

I have written many codes using OOPS and I am still to understand when is a code good enough to be accepted by experts. The thought procedure of every man is different and so is the design. My question is should I do something in particular to design my programs in such a way that they are good enough to be accepted by people. Other thing I have also read Head First Object Oriented Design but at last I feel that the way they design the problems is much different I would have designed them.

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Install/upgrade ubuntu from another system

- by Samarth Agarwal

I have a new Laptop with latest Ubuntu preinstalled on it, its 12.04. I have another laptop with Ubuntu 10.04 on it. What I lack is a fast internet connection. I want to upgrade my Ubuntu 10 laptop to a ubuntu 12 version. How is this possible without using internet connection? Can I move/copy the installation from the new laptop to the older one? Is there a way so that the newer laptop can upgrade the older one using a usb disk or dvd/cd?

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