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• How to fix the size of the Hashtable and find the whether it has fix size or not?

  - by Vijjendra

  Hi All, I am trying to fix the size of the Hashtable with following code. Hashtable hashtable = new Hashtable(2); //Add elements in the Hashtable hashtable.Add("A", "Vijendra"); hashtable.Add("B", "Singh"); hashtable.Add("C", "Shakya"); hashtable.Add("D", "Delhi"); hashtable.Add("E", "Singh"); hashtable.Add("F", "Shakya"); hashtable.Add("G", "Delhi"); hashtable.Add("H", "Singh"); hashtable.Add("I", "Shakya"); hashtable.Add("J", "Delhi"); I have fix the size of this Hashtable is 2 but I can add more than 2 elements in this, why this happen, I am doing somthing wrong? I have tried to find out is this Hashtable have fix size of not with hashtable.IsFixedSize, it always returns false Please tell me where I am wrong, or there is another way..

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• Why I am not able to display image using swing worker?

  - by Vimal Basdeo

  I was trying some codes to implement a scheduled task and came up with these codes . import java.util.*; class Task extends TimerTask { int count = 1; // run is a abstract method that defines task performed at scheduled time. public void run() { System.out.println(count+" : Mahendra Singh"); count++; } } class TaskScheduling { public static void main(String[] args) { Timer timer = new Timer(); // Schedule to run after every 3 second(3000 millisecond) timer.schedule( new Task(), 3000); } } My output : 1 : Mahendra Singh I expected the compiler to print a series of Mahendra Singh at periodic interval of 3 s but despite waiting for around 15 minutes, I get only one output...How do I solve this out?

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• Question regarding Manifest in Java jar file

  - by Tara Singh

  Hi All, Is is mandatory to have classpath inside a Manifest file inside the java jar file? can we do work without having the classpath inside it? The reason why I am asking this is because I have a jar file for a server application. When I tried to connect many connections with Server, Server went down and the error was "Too many open files", when searched about it, I found one Sun Bug http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6446657 . Then I checked and i was having a classpath entry in the Jar file. So this question arises. Thanks, Tara Singh

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• How is load average related to CPU utilization?

  - by Kaustubh P

  I am facing a load average of 3 since past 2 days. The CPU utilization is never above 40 % in all cases. Here are some screenshots of Server Density monitoring tool that I use. The process snapshot at the highest peak, @ 0:00 is as follows: And the process snapshot at the peak created at 12:00 is: My question is, even though CPU utilization is not 100 %, why am I facing a high average? PS: All snapshots are sorted by descending CPU utilization.

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• What is a good and safe way of sharing certificates?

  - by Kaustubh P

  I have a few certificates, that are used as authentication, to ssh into my servers on the Amazon cloud. I rotate those certificates weekly, manually. My question is, I need to share the certificates with some colleagues, a few on the LAN, and a few in another part of the country. What is the best practice to share the certificate? My initial thoughts were Dropbox and email. We dont host dedicated email servers with encryption and all, and dont have a VPN. Thanks.

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• howto configure proxy.conf for mod_proxy, apache2, jetty

  - by Kaustubh P

  Hello, This is how I have setup my environment, atm. An apache2 instance on port 80. Jetty instance on the same server, on port 8090. Use-Case: When I visit foo.com, I should see the webapp, which is hosted on jetty, port 8090. If I put foo.com/blog, I should see the wordpress blog, which is hosted on apache. (I read howtos on the web, and installed it using AMP.) Below are my various configuration files: /etc/apache2/mods-enabled/proxy.conf: ProxyPass / http://foo.com:8090/ << this is the jetty server ProxyPass /blog http://foo.com/blog ProxyRequests On ProxyVia On <Proxy *> Order deny,allow Allow from all </Proxy> ProxyPreserveHost On ProxyStatus On /etc/apache2/httpd.conf: LoadModule proxy_module /usr/lib/apache2/modules/mod_proxy.so LoadModule proxy_balancer_module /usr/lib/apache2/modules/mod_proxy_balancer.so LoadModule proxy_http_module /usr/lib/apache2/modules/mod_proxy_http.so LoadModule proxy_ajp_module /usr/lib/apache2/modules/mod_proxy_ajp.so I have not created any other files, in sites-available or sites-enabled. Current situation: If I goto foo.com, I see the webapp. If I goto foo.com/blog, I see a HTTP ERROR 404 Problem accessing /errors/404.html. Reason: NOT_FOUND powered by jetty:// If I comment out the first ProxyPass line, then on foo.com, I only see the homepage, without CSS applied, ie, only text.. .. and going to foo.com/blog gives me a this error: The proxy server received an invalid response from an upstream server. The proxy server could not handle the request GET /blog. Reason: Error reading from remote server I also cannot access /phpmyadmin, giving the same 404 NOT_FOUND error as above. I am running Debian squeeze on an Amazon EC2 Instance. Question: Where am I going wrong? What changes should I make in the proxy.conf (or another conf files) to be able to visit the blog?

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• Merging free space of hard drive to primary partition

  - by Dibya Ranjan

  I have purchased a new HDD, I tried to format making 1 primary partition, I converted the rest unallocated space to extended partition then to logical drive now I have 3 logical drives. I feel that the size allocated to the primary partition is less so I used shrink option to the 3 logical partitions in diskmgmt but each partition is resulting in one memory block of Free space. Now I want to merge these free spaces to my primary partition.

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• howto configure mod_proxy for apache2, jetty

  - by Kaustubh P

  Hello, This is how I have setup my environment, atm. An apache2 instance on port 80. Jetty instance on the same server, on port 8090. Use-Case: When I visit foo.com, I should see the webapp, which is hosted on jetty, port 8090. If I put foo.com/blog, I should see the wordpress blog, which is hosted on apache. (I read howtos on the web, and installed it using AMP.) Below are my various configuration files: /etc/apache2/mods-enabled/proxy.conf: ProxyPass / http://foo.com:8090/ << this is the jetty server ProxyPass /blog http://foo.com/blog ProxyRequests On ProxyVia On <Proxy *> Order deny,allow Allow from all </Proxy> ProxyPreserveHost On ProxyStatus On /etc/apache2/httpd.conf: LoadModule proxy_module /usr/lib/apache2/modules/mod_proxy.so LoadModule proxy_balancer_module /usr/lib/apache2/modules/mod_proxy_balancer.so LoadModule proxy_http_module /usr/lib/apache2/modules/mod_proxy_http.so LoadModule proxy_ajp_module /usr/lib/apache2/modules/mod_proxy_ajp.so I have not created any other files, in sites-available or sites-enabled. Current situation: If I goto foo.com, I see the webapp. If I goto foo.com/blog, I see a HTTP ERROR 404 Problem accessing /errors/404.html. Reason: NOT_FOUND powered by jetty:// If I comment out the first ProxyPass line, then on foo.com, I only see the homepage, without CSS applied, ie, only text.. .. and going to foo.com/blog gives me a this error: The proxy server received an invalid response from an upstream server. The proxy server could not handle the request GET /blog. Reason: Error reading from remote server I also cannot access /phpmyadmin, giving the same 404 NOT_FOUND error as above. I am running Debian squeeze on an Amazon EC2 Instance. Question: Where am I going wrong? What changes should I make in the proxy.conf (or another conf files) to be able to visit the blog?

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• How do I expose a webapp on :8090, even though firewall allows only :80 and :22

  - by Kaustubh P

  I am a noob in Server related stuff, so bear me. I use amazon webservices (EC2) on which I have a webapp running on jetty, which runs on port 8090. I deploy the webapp through the usual method of java -jar start.jar So then to access the app, I have to add a port in the URL, like this: someIP:8090/app But just typing someIP in the browser takes me to a page that shows It works! This is the default web page for this server. The web server software is running but no content has been added, yet. which I assume is apache. I have apache, tomcat and jetty installed. What can I do so that I dont have to specify the port? Do I have to perform port-forwarding? Thanks a lot.

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• Computer makes hissing noise, turns off after few seconds

  - by Kaustubh P

  I have a problem similar to the questions posted here and here. This is my config: Asus M3N78-EM, with AMD Phenom X3 720 2800 Black Edition, 4GB Transcend DDR2 RAM, Nvidia 9400GT. HD is a 160 GB IDE, and a LG IDE DVD-ROM. The power button is a bit off, I have removed the cover of the switch, and the only way it turns on is just giving the "stick" under the cover a gentle press. It turns on sometimes, and at other times, I have to cut-off the power from the PSU, and try again. I will describe my problem in as detail as possible, please bear with me: The problem has started in the last week, a few months after I changed the to the powerswitch arrangement as described above. The PC makes a hissing noise, and I wasn't able to pin-point the noise source, because of the various other fans. At first, removing the HD, rebooting w/o the HD, turning it off, reconnecting and booting made the problem go away. But of late, it doesn't happen. As suggested in the other questions, I tried reducing the load by disconnecting both the IDE drives, and the problem (noise + turn-off) still occurs. I also connected another 80G IDE HD,today morning, adn it still made that noise, and turned off. I also opened up the PSU, but I couldn't see any fault in that, I tried rotating the fan by blowing into the blades, and with my fingers, but the hissing noise didn't come from there. Or maybe the speed wasn't enough to evoke that noise. A few weeks ago: I had cleaned the Cabinet and had repasted the processor and its fan using some thermal paste. Could that be at fault? I also used a vacuum to blow the dust out of the PSU, could the power have been too much, to maybe offset the fan or something? A label on the PSU says it uses a ball-bearing fan. That only leaves me with the Processor fan and the processor itself. I didn't try removing the processor fan and processor from the motherboard, and then turning the PC on, fearing damage. Will doing so cause any damage? What can I do to localize and pin-point the problem? Also, after a few tries, the Computer starts up. Sometimes it turns of within 2 seconds, sometimes after the POST. Once it turned off at the grub. Another time it booted completely and then turned off. The only way to ensure that the PC wont turn off, is if the hissing noise stops. EDIT: I suspect it to be the Processor/Processor fan, owing to the source of noise. All the config, except for the Cabinet, is just over a year old. EDIT2: I also just remembered, that I had set the "On-power resume" to turn on, i.e. If I supply he PC with power, it will turn itself on, w/o me needing to press the switch. I had done that to workaround the faulty power-switch, as noted above. EDIT3: I calculated the power my system needs, from the antec site, and I just arrived at 292W

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• Facing error: "Could not open a connection to your authentication agent."; trying to add ssh-key.

  - by Kaustubh P

  I use ubuntu server 10.04. ssh-add /foo/cert.pem gave the following output Could not open a connection to your authentication agent. These are my running processes: ps -aux | grep ssh Warning: bad ps syntax, perhaps a bogus '-'? See http://procps.sf.net/faq.html root 1523 0.0 0.0 49260 632 ? Ss Dec25 0:00 /usr/sbin/sshd root 10023 0.0 0.3 141304 6012 ? Ss 12:58 0:00 sshd: padmin [priv] padmin 10117 0.0 0.1 141304 2400 ? S 12:58 0:00 sshd: padmin@pts/1 padmin 11867 0.0 0.0 7628 964 pts/1 S+ 13:06 0:00 grep --color=auto ssh root 31041 0.0 0.3 141264 5884 ? Ss 11:24 0:00 sshd: padmin [priv] padmin 31138 0.0 0.1 141264 2312 ? S 11:25 0:00 sshd: padmin@pts/0 root 31382 0.0 0.3 139240 5844 ? Ss 11:26 0:00 sshd: padmin [priv] padmin 31475 0.0 0.1 139372 2488 ? S 11:27 0:00 sshd: padmin@notty padmin 31476 0.0 0.0 12468 964 ? Ss 11:27 0:00 /usr/lib/openssh/sftp-server These are my environment variables: $ env | grep SSH SSH_CLIENT=192.168.1.13 42626 22 SSH_TTY=/dev/pts/1 SSH_CONNECTION=192.168.1.13 42626 192.168.1.2 22 What is wrong? Why cant I add any identities? Thanks.

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• No headphone or speakers plugged in - Windows 7 issue

  - by Amit Ranjan

  I am facing a wierd issue between my sound card driver and Windows7(any edition). I have a sony vaio notebook (VPCEB24EN). Two days ago, on start I got diabled wifi, charging and speakers. Then I restart the PC and everthing worked fine. Later on I again restarted my machine, and then I found the my speakers were not working. I thought, restart will work. I restarted many more times but it did'nt work. I searched google and found that , it might be due to : 1. Hardware is not switched on from bios. 2. No hardware. 3. overriding 64-bit drivers with 32-bit drivers. To make it working, I restored my laptop from scratched, but while restoring pc, the realtek HD drivers, it gave me an error 505. I then formatted the drive and installed Win7 Ultimate 32bit (With PC was, Win7 64-bit Home Basic). I got lots of yellow exclamation in device manager, thinking now this will resolve my issue. But Even after the installing all drivers on a fresh installation, I was still with the same position. A red cross on speaker- No Speakers or Headphone plugged in. Please Note: My Laptop is Vaio , E Series, VPCEB24EN. Audio : Intel® High Definition Audio compatible but accepts Realted Audio. While using BIOS Agent, I got Intel Chipset 5 Series Audio Adapter and ATI RV370 Audio adapter found on my board. Installed is Win7 32bit Ultimate. factory default was Win7 64-bit Home Basic Memory: RAM 3GB/ 320GB HDD Display : ATI Mobility Radeon™ HD 5145 Graphics

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• Needs free/ opensource network monitoring tool for office LAN

  - by Amit Ranjan

  I know there must be a lot similar questions on SU. Let me explain my setup first. I have 4-5 PC, Laptops and Few Android Phones in my office. To get them on a network , I have a UTStarCom, WA3002G1 ADSL2+ router with a landline broadband connection which has nothing to do with any PC except the configuration settings. Broadband channel is always on, we need to switch on the router and the internet is ready for us. No Internet Connection sharing is done via any PC. I have a limited 20GB monthly plan, which is consumed in 10-20 days, depending upon the download requirements. So in the above case, i need some suggestions from you: How do I monitor my Internet Bandwidth along-with the connected systems, realtime? Any free opensource tool available? Tweaks / Changes in PC to save bandwidth as my ISP do not have any Unlimited plan. PC and Laptops are Windows XP and/Or windows 7. Either of the platform tools are welcome.

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• How do I map an elastic IP to a domain, dont want to use Route 53

  - by Kaustubh P

  This is the first time I am doing this, so noob alert. I have an ec2 instance, to which I have assigned an elastic IP. I want to map this elastic IP to a webaddress foo.com, which I have bought from name.com. How do I do this? It would be very helpful if you you increase my vocabulary, and tell me the things involved, I dont know where to begin, SO has always been helpful! This is a screenshot of my name.com CP:

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• Cant deploy "war" file from Virtual Hosts, see a directory listing.

  - by Kaustubh P

  This is my httpd.conf configured with Virtual hosts: NameVirtualHost *:80 <VirtualHost *:80> ServerName http://foo.baz.in DocumentRoot /var/www/foo/ </VirtualHost> <VirtualHost *:80> ServerName http://bar.baz.in DocumentRoot /var/www/ </VirtualHost> The second virtual host is a Wordpress blog, configured with .htaccess, and index.php in the root i.e. /var/www, and rest of the files in wordpress's own folder. However, the first virtual host is a "war" file, and when I goto foo.baz.in, I see the directory listing, containing the war. I also tried changing the DocumentRoot to /var/www/foo/foo.war` but I get an error Restarting web server: apache2Warning: DocumentRoot [/var/www/foo/foo.war] does not exist I also changed the owner and permission of the war to www-data:www-data and changed the permissions to 755, but to no avail. How do I make apache deploy my "war"? Thanks.

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• Is it possible to save the product key of Windows 8?

  - by Dibya Ranjan

  I have Windows 8 activated in my system. I don't have the product key of windows right now. Now I want to format my system again. Is there any way so that I can reuse the key? Is there any way I can get the key from an activated windows machine? Edit: I am not able to find the product key because I have used a MAK as my product key. Now I want the same to use it after formatting my disk. I found a software Volume Activation Manager tool on the windows website. I am not sure how to use it. Please tell me how can I reuse my key?

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• How does an optimizing compiler react to a program with nested loops?

  - by D.Singh

  Say you have a bunch of nested loops. public void testMethod() { for(int i = 0; i<1203; i++){ //some computation for(int k=2; k<123; k++){ //some computation for(int j=2; j<12312; j++){ //some computation for(int l=2; l<123123; l++){ //some computation for(int p=2; p<12312; p++){ //some computation } } } } } } When the above code reaches the stage where the compiler will try to optimize it (I believe it's when the intermediate language needs to converted to machine code?), what will the compiler try to do? Is there any significant optimization that will take place? I understand that the optimizer will break up the loops by means of loop fission. But this is only per loop isn't it? What I mean with my question is will it take any action exclusively based on seeing the nested loops? Or will it just optimize the loops one by one? If the Java VM complicates the explanation then please just assume that it's C or C++ code.

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• How to implement Undo and Redo feature in as3

  - by Swati Singh

  I am going to create an application in that i have to implement an Undo and Redo feature. In the application there will be multiple objects located on stage and user can customize the position of the objects. But when user clicks on Undo the object go back to their default position and after clicking on redo object will move on the new position. So my question is how can i apply these feature in my application? Is there any library or any third party classes? Can some one help me? Thanks in advance.

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• How to be up to date with the LAMP platform?

  - by Shakti Singh

  Most of times I get to know about the new features from my colleagues or someone else. It is okay at least I know about them does not matter from where I know But I feel it is too late to know about those features. I am working on LAMP platform and I want to keep myself up to date with the new things, anything happening new with LAMP. Can you please let me know what resources should I use? What groups should I follow? From where I can get the latest updates about any activity, event and feature about LAMP?

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• Stretch in multiple components using af:popup, af:region, af:panelTabbed

  - by Arvinder Singh

  Case study: I have a pop-up(dialogue) that contains a region(separate taskflow) showing a tab. The contents of this tab is in a region having a separate taskflow. The jsff page of this taskflow contains a panelSplitter which in turn contains a table. In short the components are : pop-up(dialogue) --> region(separate taskflow) --> tab --> region(separate taskflow) --> panelSplitter --> table At times the tab is not displayed with 100% width or the table in panelSplitter is not 100% visible or the splitter is not visible. Maintaining the stretch for all the components is difficult......not any more!!! Below is the solution that you can make use of in many similar scenarios. I am mentioning the major code snippets affecting the stretch and alignment. pop-up: <af:popup> <af:dialog id="d2" type="none" title="" inlineStyle="width:1200px"> <af:region value="#{bindings.PriceChangePopupFlow1.regionModel}" id="r1"/> </af:dialog> The above region is a jsff containing multiple tabs. I am showing code for a single tab. I kept the tab in a panelStretchLayout. <af:panelStretchLayout id="psl1" topHeight="300px" styleClass="AFStretchWidth"> <af:panelTabbed id="pt1"> <af:showDetailItem text="PO Details" id="sdi1" stretchChildren="first" > <af:region value="#{bindings.PriceChangePurchaseOrderFlow1.regionModel}" id="r1" binding="# {pageFlowScope.priceChangePopupBean.poDetailsRegion}" /> This "region" displays a .jsff containing a table in a panelSplitter. <af:panelSplitter id="ps1"  orientation="horizontal" splitterPosition="700"> <f:facet name="first"> <af:panelHeader text="PurchaseOrder" id="ph1"> <af:table id="md1" rows="#{bindings.PurchaseOrderVO.rangeSize}" That's it!!! We're done... Note the stretchChildren="first" attribute in the af:showDetailItem. That does the trick for us. Oracle docs say the following about stretchChildren :  Valid Values: none, first The stretching behavior for children. Acceptable values include: "none": does not attempt to stretch any children (the default value and the value you need to use if you have more than a single child; also the value you need to use if the child does not support being stretched) "first": stretches the first child (not to be used if you have multiple children as such usage will produce unreliable results; also not to be used if the child does not support being stretched)

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• scrapy cannot find div on this website [on hold]

  - by Jaspal Singh Rathour

  I am very new at this and have been trying to get my head around my first selector can somebody help? i am trying to extract data from page http://groceries.asda.com/asda-webstore/landing/home.shtml?cmpid=ahc--ghs-d1--asdacom-dsk-_-hp#/shelf/1215337195041/1/so_false all the info under div class = listing clearfix shelfListing but i cant seem to figure out how to format response.xpath(). I have managed to launch scrapy console but no matter what I type in response.xpath() i cant seem to select the right node. I know it works because when I type response.xpath('//div[@class="container"]') I get a response but don't know how to navigate to the listsing cleardix shelflisting. I am hoping that once i get this bit I can continue working my way through the spider. Thank you in advance! PS I wonder if it is not possible to scan this site - is it possible for the owners to block spiders?

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• Scrapy cannot find div on this website [on hold]

  - by Jaspal Singh Rathour

  I am very new at this and have been trying to get my head around my first selector can somebody help? i am trying to extract data from page http://groceries.asda.com/asda-webstore/landing/home.shtml?cmpid=ahc--ghs-d1--asdacom-dsk-_-hp#/shelf/1215337195041/1/so_false all the info under div class = listing clearfix shelfListing but i cant seem to figure out how to format response.xpath(). I have managed to launch scrapy console but no matter what I type in response.xpath() i cant seem to select the right node. I know it works because when I type response.xpath('//div[@class="container"]') I get a response but don't know how to navigate to the listsing cleardix shelflisting. I am hoping that once i get this bit I can continue working my way through the spider. Thank you in advance! PS I wonder if it is not possible to scan this site - is it possible for the owners to block spiders?

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• Whether to go for part MBA or not [closed]

  - by Santosh singh

  I need your help in knowing more about SP Jain Finance MBA. I am currently working in Singapore as a tech lead having 6.5 year experience in IT, planning to do part time MBA. There are currently 3 specialisation offered- marketing,operations and finance- I am not sure which one to choose. Whether I would be able to find a job in finance after getting MBA degree from SP Jain. Basically I do not forsee any career growth in my present company, so in a fix should I do MBA or go for some specialised course if you suggest.

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• Upgrade problem during Ubuntu 11.10

  - by pankaj singh

  During upgrading in last moment, show memory problem but I restart my laptop in hurry than it give that type of message what can i do? *starting automatic crash report generation [fail] PulseAudio configured for pre-user sessions saned disabled :edit/etc/default/saned *stopeing save kernel messages [ok] After than invoking init scripts through /etc/init.d, use the service(8) utility,eg. service S90binfmt-support start Since the scripts you are attempting to invoke has been converted to an Upstart pb, you may also use the start(8)utility, e.g start S90binfmt-support start:Unknown job:S90binfmt-support *Stopping anac(h)ronistic c[ok] *checking battery state.. [ok] * stopping System V runlevel compatibility [ok]

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• Resolving a cname using different DNS

  - by Sandeep Singh Rawat

  I have a domain name (e.g. abc.com) registered in GoDaddy and I have a few subdomains (mail, blog) correctly setup to a different hosts. Now I want to park my domain with a parking host (seohosting.com) which asked me to change my nameserver to their DNS. What I want is to only redirect dns queries for (www or @) cname to seohosting.com while still being able to use my other cname for my own purpose. Is there a way to do this? I dont have the host IP address for parking host.

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