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• Talking JavaOne with Rock Star Raghavan Srinivas

  - by Janice J. Heiss

  Raghavan Srinivas, affectionately known as “Rags,” is a two-time JavaOne Rock Star (from 2005 and 2011) who, as a Developer Advocate at Couchbase, gets his hands dirty with emerging technology directions and trends. His general focus is on distributed systems, with a specialization in cloud computing. He worked on Hadoop and HBase during its early stages, has spoken at conferences world-wide on a variety of technical topics, conducted and organized Hands-on Labs and taught graduate classes.He has 20 years of hands-on software development and over 10 years of architecture and technology evangelism experience and has worked for Digital Equipment Corporation, Sun Microsystems, Intuit and Accenture. He has evangelized and influenced the architecture of numerous technologies including the early releases of JavaFX, Java, Java EE, Java and XML, Java ME, AJAX and Web 2.0, and Java Security.Rags will be giving these sessions at JavaOne 2012: CON3570 -- Autosharding Enterprise to Social Gaming Applications with NoSQL and Couchbase CON3257 -- Script Bowl 2012: The Battle of the JVM-Based Languages (with Guillaume Laforge, Aaron Bedra, Dick Wall, and Dr Nic Williams) Rags emphasized the importance of the Cloud: “The Cloud and the Big Data are popular technologies not merely because they are trendy, but, largely due to the fact that it's possible to do massive data mining and use that information for business advantage,” he explained. I asked him what we should know about Hadoop. “Hadoop,” he remarked, “is mainly about using commodity hardware and achieving unprecedented scalability. At the heart of all this is the Java Virtual Machine which is running on each of these nodes. The vision of taking the processing to where the data resides is made possible by Java and Hadoop.” And the most exciting thing happening in the world of Java today? “I read recently that Java projects on github.com are just off the charts when compared to other projects. It's exciting to realize the robust growth of Java and the degree of collaboration amongst Java programmers.” He encourages Java developers to take advantage of Java 7 for Mac OS X which is now available for download. At the same time, he also encourages us to read the caveats. Originally published on blogs.oracle.com/javaone.

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• Talking JavaOne with Rock Star Raghavan Srinivas

  - by Janice J. Heiss

  Raghavan Srinivas, affectionately known as “Rags,” is a two-time JavaOne Rock Star (from 2005 and 2011) who, as a Developer Advocate at Couchbase, gets his hands dirty with emerging technology directions and trends. His general focus is on distributed systems, with a specialization in cloud computing. He worked on Hadoop and HBase during its early stages, has spoken at conferences world-wide on a variety of technical topics, conducted and organized Hands-on Labs and taught graduate classes.He has 20 years of hands-on software development and over 10 years of architecture and technology evangelism experience and has worked for Digital Equipment Corporation, Sun Microsystems, Intuit and Accenture. He has evangelized and influenced the architecture of numerous technologies including the early releases of JavaFX, Java, Java EE, Java and XML, Java ME, AJAX and Web 2.0, and Java Security.Rags will be giving these sessions at JavaOne 2012: CON3570 -- Autosharding Enterprise to Social Gaming Applications with NoSQL and Couchbase CON3257 -- Script Bowl 2012: The Battle of the JVM-Based Languages (with Guillaume Laforge, Aaron Bedra, Dick Wall, and Dr Nic Williams) Rags emphasized the importance of the Cloud: “The Cloud and the Big Data are popular technologies not merely because they are trendy, but, largely due to the fact that it's possible to do massive data mining and use that information for business advantage,” he explained. I asked him what we should know about Hadoop. “Hadoop,” he remarked, “is mainly about using commodity hardware and achieving unprecedented scalability. At the heart of all this is the Java Virtual Machine which is running on each of these nodes. The vision of taking the processing to where the data resides is made possible by Java and Hadoop.” And the most exciting thing happening in the world of Java today? “I read recently that Java projects on github.com are just off the charts when compared to other projects. It's exciting to realize the robust growth of Java and the degree of collaboration amongst Java programmers.” He encourages Java developers to take advantage of Java 7 for Mac OS X which is now available for download. At the same time, he also encourages us to read the caveats.

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• How to avoid last character truncation in editor

  - by srinivas

  Hi I am using WYSIWYG - jQuery plugin 0.4 for tinymce editor. whenever i am loading the editor, IFrame tag is created which is displayed is getting with textarea tag which is hidden. The problem here is the last character is getting truncated whatever we typed in the editor. I am seeing that hidden tag textarea is getting the value from the second character which is keyed from editor. Please let me know how to resolve this issue. Thanks Srinivas

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• create jrxml file at run time and modify at run time

  - by Srinivas

  Hi I have a requirement to develop custom reports where we already have some reoprts developed using JasperReports using iReport tool. Now the requirement is to modify those reports design at run time. I should use those existing jrxml files and save as to new report then change the design at run time. Also I should see those newly created reports whenever I want. I have gone through the Jasper API and Dynamic Reports where we can create the reports dynamically at run time but we can't save the design (like JRXML). I am looking for any other JRXML design API to create and modify and save the Jasper Reports at run time. I appreciate if any one can help me. Thanks in Advance Srinivas

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• create jrml file at run time and modify at run time

  - by Srinivas

  Hi I have a requirement to develop custom reports where we already have some reoprts developed using JasperReports using iReport tool. Now the requirement is to modify those reports design at run time. I should use those existing jrxml files and save as to new report then change the design at run time. Also I should see those newly created reports whenever I want. I have gone through the Jasper API and Dynamic Reports where we can create the reports dynamically at run time but we can't save the design (like JRXML). I am looking for any other JRXML design API to create and modify and save the Jasper Reports at run time. I appreciate if any one can help me. Thanks in Advance Srinivas

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• xcode loading the images in background process, it leads to crash the application when i scroll the

  - by Srinivas G

  Hi, I have developed an application which has retrieved the information from remote location...so i put those in UITableView's Section.In response, i will be getting images also..for this i put the background process(only for images..because the app will take more time to retrieve images than text based information..).It is working fine...But if i scroll the tableview while loading the images..it is going to be crashed.... crash Log: Tried to obtain the web lock from a thread other than the main thread or the web thread. This may be a result of calling to UIKit from a secondary thread. Crashing now... could anyone has the solution for this..please let me know..how to resolve this crash...Even i used NSThread class for this.. but i didn't get the solution... Thanks, Srinivas G

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• How to program critical section for reader-writer systems?

  - by Srinivas Nayak

  Hi, Lets say, I have a reader-writer system where reader and writer are concurrently running. 'a' and 'b' are two shared variables, which are related to each other, so modification to them needs to be an atomic operation. A reader-writer system can be of the following types: rr ww r-w r-ww rr-w rr-ww where [ r : single reader rr: multiple reader w : single writer ww: multiple writer ] Now, We can have a read method for a reader and a write method for a writer as follows. I have written them system type wise. rr read_method { read a; read b; } ww write_method { lock(m); write a; write b; unlock(m); } r-w r-ww rr-w rr-ww read_method { lock(m); read a; read b; unlock(m); } write_method { lock(m); write a; write b; unlock(m); } For multiple reader system, shared variable access doesn't need to be atomic. For multiple writer system, shared variable access need to be atomic, so locked with 'm'. But, for system types 3 to 6, is my read_method and write_method correct? How can I improve? Sincerely, Srinivas Nayak

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• Running Apache and Tomcat together on different subdomains?

  - by Ritesh M Nayak

  Posted this on ServerFault but didn't get a response. Hoping I will have better luck on the Ubuntu site. I have been trying to get this working the whole of today. I have a server which resolves to the domain example.com . This is running Apache2 and Tomcat 6. The requirement is to direct requests to example.com to apache2 and app.example.com to Tomcat. I know I have to do a VirtualHost proxy pass for this to work. Here are the settings on my server. /etc/hosts file looks something like this 127.0.0.1 localhost localhost.localdomain example.com app.example.com I have two virtual host files for the different domains in /etc/apache2/sites-enabled /etc/apache2/sites-enabled/example.com looks like this <VirtualHost *:80> # Admin email, Server Name (domain name) and any aliases ServerAdmin webmaster@localhost ServerName example.com ServerAlias www.example.com DocumentRoot /var/www <Directory /> Options FollowSymLinks AllowOverride None </Directory> <Directory /var/www/> Options Indexes FollowSymLinks MultiViews AllowOverride None Order allow,deny allow from all </Directory> ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/ <Directory "/usr/lib/cgi-bin"> AllowOverride None Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch Order allow,deny Allow from all </Directory> ErrorLog /var/log/apache2/error.log # Possible values include: debug, info, notice, warn, error, crit, # alert, emerg. LogLevel warn CustomLog /var/log/apache2/access.log combined Alias /doc/ "/usr/share/doc/" <Directory "/usr/share/doc/"> Options Indexes MultiViews FollowSymLinks AllowOverride None Order deny,allow Deny from all Allow from 127.0.0.0/255.0.0.0 ::1/128 </Directory> </VirtualHost> /etc/apache2/sites-enabled/app.example.com file looks like this <VirtualHost *:80> ServerName app.example.com ServerAlias www.app.example.com ProxyPreserveHost On ProxyPass / http://localhost:8080/ ProxyPassReverse / http://localhost:8080/ SetEnv force-proxy-request-1.0 1 SetEnv proxy-nokeepalive 1 </VirtualHost> mod_proxy and mod_rewrite are both enabled on the apache instance. I have a CNAME entry for both example.com and app.example.com. When accessing app.example.com, I get an 403 forbidden, saying I have no access to / on the server. What am I doing wrong?

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• How do I install Nautilus-Elementary?

  - by Srinivas G

  I've added the am-monkeyd PPA and upgraded my system. Yet, there's no sign of elementary in my fresh Maverick RC install. Have I done anything wrong? The PPA upgrades the default nautilus package and there is no separate "nautilus-elementary" package as of now. Now, there are three versions listed in the package properties: 1:2.32.0-0ubuntu1-ppa1 (maverick); 1:2.32.0-0ubuntu5~ppa5 (maverick); 1:2.32.0-0ubuntu1 (maverick); Anything you can make out from this?

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• Fairness: Where can it be better handled?

  - by Srinivas Nayak

  Hi, I would like to share one of my practical experience with multiprogramming here. Yesterday I had written a multiprogram. Modifications to sharable resources were put under critical sections protected by P(mutex) and V(mutex) and those critical section code were put in a common library. The library will be used by concurrent applications (of my own). I had three applications that will use the common code from library and do their stuff independently. my library --------- work_on_shared_resource { P(mutex) get_shared_resource work_with_it V(mutex) } --------- my application ----------- application1 { *[ work_on_shared_resource do_something_else_non_ctitical ] } application2 { *[ work_on_shared_resource do_something_else_non_ctitical ] } application3 { *[ work_on_shared_resource ] } *[...] denote a loop. ------------ I had to run the applications on Linux OS. I had a thought in my mind, hanging over years, that, OS shall schedule all the processes running under him with all fairness. In other words, it will give all the processes, their pie of resource-usage equally well. When first two applications were put to work, they run perfectly well without deadlock. But when the third application started running, always the third one got the resources, but since it is not doing anything in its non-critical region, it gets the shared resource more often when other tasks are doing something else. So the other two applications were found almost totally halted. When the third application got terminated forcefully, the previous two applications resumed their work as before. I think, this is a case of starvation, first two applications had to starve. Now how can we ensure fairness? Now I started believing that OS scheduler is innocent and blind. It depends upon who won the race; he got the largest pie of CPU and resource. Shall we attempt to ensure fairness of resource users in the critical-section code in library? Or shall we leave it up to the applications to ensure fairness by being liberal, not greedy? To my knowledge, adding code to ensure fairness to the common library shall be an overwhelming task. On the other hand, believing on the applications will also never ensure 100% fairness. The application which does a very little task after working with shared resources shall win the race where as the application which does heavy processing after their work with shared resources shall always starve. What is the best practice in this case? Where we ensure fairness and how? Sincerely, Srinivas Nayak

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• Sound plays from laptop speakers only even when headphones are connected

  - by Ankush N Nayak

  I'm using a Dell Vostro 1014 laptop with Ubuntu 11.10. From the time I had Ubuntu 9.04, sound comes from the laptop speakers only even when I plug in earphones or external speakers. Also, if an external microphone plugged in, it does not work. Dell even replaced my motherboard to check for hardware issues but the problem persists. So it is definitely not a hardware issue. The sound plays perfectly through the headphones in the pre-boot diagnostics. So I figure, this must be a problem with Ubuntu not recognizing my sound card. Please try to give a solution for this problem.

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• Confused about career options in Web Developement.

  - by Radheshyam Nayak

  I am currently in the final year of my graduation in computer science course. I love programming in PHP but not under pressure. As my graduation life is going to be over I have to shape up my career. My personal desire is to become a web developer and start my own web-based company after completion of courses. I do not have any desire to work for a company as a developer. Currently I have programming knowledge of PHP, Mysql and Javascript. Though I have not completed any type of project in PHP. So to become a complete web developer what else do I need to know to be able to get developement project? Any project I apply for are simply declined due to lack of portfolio. So how should I proceed?

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• Dual Boot Windows 8 with Ubuntu 12.10

  - by karthik nayak

  This is my First time so please help/ Steps I Followed : Install windows 8 pro with media centre On my asus k55vm, i7 ,8gb. windows boots fine and is in perfect condition. booted into Ubuntu live USB and installed ( it detected windows, installed alongside windows 8 with recommended setting ) installed perfectly. rebooted , but no option to select Ubuntu, just loads into windows 8 without any option, tried boot repair and no use . Please HElp , tried many tutorials to no use , heard about easybcd also , any help ?

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• How can I connect to wireless network using a wireless dongle in Ubuntu 11.10?

  - by Ajita Kumar Nayak

  i have dual operating system xp and ubuntu 11.10 and trying to connet internet by using HSDPA 3GPP Release5 Micromax Dongle but it is working in windows xp not in ubuntu.I am unable to connect internet even i have done my edit connection and all the setting using aircel network but unable to connect internet.plz give me a sugession how could i do manually. How can I connect to wireless network using a wireless dongle in Ubuntu 11.10?

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• No GUI, only CLI is working

  - by srinivas

  Right now I'm working on I.MX53 Quick Start Board for which has provided me the eu-boot kernel image with it and Android rootfs. It is working fine. The problem is when I am trying to change the rootfs with Ubuntu, I am able to use CLI with all 6 terminals working but no GUI is working. I tried many versions of rootfs like Ubuntu 11.10, 12.04 and core etc. Everything with the same result. Please help me.

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• NTFS Permissions-Special Permissions not working

  - by Srinivas

  I am using Windows 2008 R2 Server having a CENTRAL SHARED FOLDER (CENTRALSTORAGE). We are trying to give Domain Users in the Network access as like User1-\CentralStorage\IT\User1 and User2-\CentralStorage\IT\User2. But it is not working when i try to login to that user in Windows XP system which is already a registered computer of domain. Will someone help me in guiding how to declare permissions like \CentralStorage\IT - this is a Main Directory and should be accessed to VIEW folder sub-directories but not to DELETE/RENAME this folder. \CentralStorage\IT\User1 - Full Control to the User1 to ADD SUB-FOLDERS AND FILES. But not to delete/rename this folder name. I gave access using Special Permissions but it is showing as Access Denied when i logon and try to access. Kindly provide me a solution for the same.

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• Localhost working fine with executing php code except mail function.

  - by Radheshyam Nayak

  i tried executing the mail() and got the following error "Warning: mail() [function.mail]: Failed to connect to mailserver at "localhost" port 25, verify your "SMTP" and "smtp_port" setting in php.ini or use ini_set() " but SMTP and smtp_port are both set in php.ini more ever other codes are working fine with localhost. disabled or/and added exception to firewell no result.... tried telnet localhost 25 error:could not connect to localhost port 25:connection failed..... Thunderbird my mail client says:could not connect to server localhost the connection was refused....

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• Localhost working fine with executing php code except mail function.

  - by Radheshyam Nayak

  i tried executing the mail() and got the following error "Warning: mail() [function.mail]: Failed to connect to mailserver at "localhost" port 25, verify your "SMTP" and "smtp_port" setting in php.ini or use ini_set() " but SMTP and smtp_port are both set in php.ini more ever other codes are working fine with localhost. disabled or/and added exception to firewell no result.... tried telnet localhost 25 error:could not connect to localhost port 25:connection failed..... Thunderbird my mail client says:could not connect to server localhost the connection was refused.... php.ini [mail function] ; For Win32 only. ; http://php.net/smtp SMTP = localhost smtp_port = 25 running mercury mail server in xampp... previously working fine but now not working..

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• PC with 2 RAMs of different frequencies (1GB 533MHz + 2GB 667MHz) showing only 2GB RAM

  - by srinivas

  I have 6 years old PC with 1.25GB (1GB + 256MB) of DDR2 533MHz RAM. As computer has become very slow and memory usage reaching its limits most of the times, i decided to upgrade RAM. But unfortunately, im not finding retailers selling DDR2 533Mhz RAM near my area. Since I was not sure mixing up RAMs of different frequencies, i searched in web. Most results said they can be mixed but computer would run at lower frequency of the 2 RAMs. So I bought 2GB DDR2 667Mhz RAM expecting my pc to have 3GB RAM running at 533 MHz. But computer properties page shows only 2GB RAM. BIOS settings too show the slot with 2GB 667MHz as ACTIVE and other slot with 1GB 533MHz as "NOT INSTALLED". When I removed 2GB RAM, they computer shows only 1GB RAM. So for some reason, 1GB RAM is not getting detected/used. What is the problem here? thanks in advance.

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• Success with E-Business Suite Release 12 Implementations: Intelligroup, Inc.

  Want to learn more about implementing Oracle E-Business Suite Release 12? Listen to this Srinivas Krishna, Sr. Intelligroup is a global provider of outsourcing services including application management and support services, infrastructure management services, innovative consulting, technology, and implementation services. Learn more at: http://www.intelligroup.com/Direction – Oracle Practice, Intelligroup, Inc discuss customer experiences and benefits from Release 12 implementations.

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• Customizing UIPickerView in xcode

  - by Srinivas G

  Hi, I developed an application which consists of UIPickerView....It displays as default size in height of the UIPickerView.I want to display the UIPickerView as 320x480 size(iphone simulator size)..so the whole screen has the picker view without using transorm property,because it will stretched the whole view....its not looking good...even with selection indicator also stretched...I need not stretchable picker view..but need to show the picker view with the whole screen..We can control the width of the UIPickerView..But how can we control the height of the UIPickerView..... Thanks & Regards...

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• Whats the difference between running a shell script as ./script.sh and sh script.sh

  - by Ritesh M Nayak

  I have a script that looks like this #!/bin/bash function something() { echo "hello world!!" } something | tee logfile I have set the execute permission on this file and when I try running the file like this $./script.sh it runs perfectly fine, but when I run it on the command line like this $sh script.sh It throws up an error. Why does this happen and what are the ways in which I can fix this.

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• Twitter Oauth home timeline display with php

  - by Srinivas Tamada

  $hometime= $Twitter-get_statusesHome_timeline(); Fatal error: Uncaught exception 'Exception' with message 'SimpleXMLElement::__construct() expects parameter 1 to be string <?php include 'EpiCurl.php'; include 'EpiOAuth.php'; include 'EpiTwitter.php'; include 'key.php'; $Twitter = new EpiTwitter($consumerKey, $consumerSecret); $oauthToken='xxxxxxxxxxxxxxxxxxxxxxx'; $oauthSecret='xxxxxxxxxxxxxxxxxxxxxxxxx'; // user switched pages and came back or got here directly, stilled logged in $Twitter->setToken($oauthToken,$oauthSecret); $user= $Twitter->get_accountVerify_credentials(); echo "<img src=\"{$user->profile_image_url}\">"; echo "{$user->name}"; $hometime= $Twitter->get_statusesHome_timeline(); $twitter_status = new SimpleXMLElement($hometime); foreach($twitter_status->status as $status){ echo '<div class="twitter_status">'; foreach($status->user as $user){ echo '<img src="'.$user->profile_image_url.'" class="twitter_image">'; echo '<a href="http://www.twitter.com/'.$user->name.'">'.$user->name.'</a>: '; } echo $status->text; echo '<br/>'; echo '<div class="twitter_posted_at"><strong>Posted at:</strong> '.$status->created_at.'</div>'; echo '</div>'; } ?>

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• Is it necessary to know flash designing for flex3 ?

  - by Srinivas Iyer

  I am from a programming background ,and newbie to flex3 . i would like to learn flex3 and develop some application using rails and flex3 . Is it necessary to know flash in order to learn flex3 or just learning Action script 3 would do ? .Can anybody tell what are the prerequisites to learn flex3 . Thanks in Advance.

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• MKPinAnnotationView in iphone Applications?

  - by Srinivas G

  Hi, I developed an application related with google maps in iphone, here i want callout without tapping pin,means when pin shows in the map itself it will show the callout.I tried with MKPinAnnotationView..but it is not showing.. could any one suggest me how to show call out without tapping the pin in MKMapView; Thanks & Regards

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