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Articles indexed Tuesday December 28 2010

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• Wicket @SpringBean doesn't create serializable proxy

  - by vinga

  @SpringBean PDLocalizerLogic loc; When using above I receive java.io.NotSerializableException. This is because loc is not serializable, but this shouldn't be problem because spring beans are a serializable proxies. On the page https://cwiki.apache.org/WICKET/spring.html#Spring-AnnotationbasedApproach is written: Using annotation-based approach, you should not worry about serialization/deserialization of the injected dependencies as this is handled automatically, the dependencies are represented by serializable proxies What am I doing wrong?

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• How many users are sufficient to make a heavy load for web application

  - by galymzhan

  I have a web application, which has been suffering high load recent days. The application runs on single server which has 8-core Intel CPU and 4gb of RAM. Software: Drupal 5 (Apache 2, PHP5, MySQL5) running on Debian. After reaching 500 authenticated and 200 anonymous users (simultaneous), the application drastically decreases its performance up to total failure. The biggest load comes from authenticated users, who perform activities, causing insert/update/deletes on db. I think mysql is a bottleneck. Is it normal to slow down on such number of users? EDIT: I forgot to mention that I did some kind of profiling. I runned commands top, htop and they showed me that all memory was being used by MySQL! After some time MySQL starts to perform terribly slow, site goes down, and we have to restart/stop apache to reduce load. Administrators said that there was about 200 active mysql connections at that moment. The worst point is that we need to solve this ASAP, I can't do deep profiling analysis/code refactoring, so I'm considering 2 ways: my tables are MyIsam, I heard they use table-level locking which is very slow, is it right? could I change it to Innodb without worry? what if I take MySQL, and move it to dedicated machine with a lot of RAM?

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• How can you get the call tree with python profilers?

  - by Oliver

  I used to use a nice Apple profiler that is built into the System Monitor application. As long as your C++ code was compiled with debug information, you could sample your running application and it would print out an indented tree telling you what percent of the parent function's time was spent in this function (and the body vs. other function calls). For instance, if main called function_1 and function_2, function_2 calls function_3, and then main calls function_3: main (100%, 1% in function body): function_1 (9%, 9% in function body): function_2 (90%, 85% in function body): function_3 (100%, 100% in function body) function_3 (1%, 1% in function body) I would see this and think, "Something is taking a long time in the code in the body of function_2. If I want my program to be faster, that's where I should start." Does anyone know how I can most easily get this exact profiling output for a python program? I've seen people say to do this: import cProfile, pstats prof = cProfile.Profile() prof = prof.runctx("real_main(argv)", globals(), locals()) stats = pstats.Stats(prof) stats.sort_stats("time") # Or cumulative stats.print_stats(80) # 80 = how many to print but it's quite messy compared to that elegant call tree. Please let me know if you can easily do this, it would help quite a bit. Cheers!

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• Limit the file inputs cloned in a form with Jquery

  - by Philip

  Hi, i use this Jquery function to clone the file input fields in my form, $(function() { var scntDiv = $('#clone'); var i = $('#clone p').size() + 1; $('#addImg').live('click', function() { $('<p><label for="attach"><input type="file" name="attachment_'+ i +'" /> <a href="#" id="remImg">Remove</a></label></p>').appendTo(scntDiv); i++; return false; }); $('#remImg').live('click', function() { if( i > 2 ) { $(this).parents('p').remove(); i--; } return false; }); }); is it possible to limit the fields that can be cloned? lets say a number of 4 fields? thanks a lot, Philip

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• SharePoint: Problem with BaseFieldControl

  - by Anoop

  Hi All, In below code in a Gird First column is BaseFieldControl from a column of type Choice of SPList. Secound column is a text box control with textchange event. Both the controls are created at rowdatabound event of gridview. Now the problem is that when Steps: 1) select any of the value from BaseFieldControl(DropDownList) which is rendered from Choice Column of SPList 2) enter any thing in textbox in another column of grid. 3) textchanged event fires up and in textchange event rebound the grid. Problem: the selected value becomes the first item or the default value(if any). but if i do not rebound the grid at text changed event it works fine. Please suggest what to do. using System; using Microsoft.SharePoint; using Microsoft.SharePoint.WebControls; using System.Web.UI; using System.Web.UI.WebControls; using System.Data; namespace SharePointProjectTest.Layouts.SharePointProjectTest { public partial class TestBFC : LayoutsPageBase { GridView grid = null; protected void Page_Load(object sender, EventArgs e) { try { grid = new GridView(); grid.ShowFooter = true; grid.ShowHeader = true; grid.AutoGenerateColumns = true; grid.ID = "grdView"; grid.RowDataBound += new GridViewRowEventHandler(grid_RowDataBound); grid.Width = Unit.Pixel(900); MasterPage holder = (MasterPage)Page.Controls[0]; holder.FindControl("PlaceHolderMain").Controls.Add(grid); DataTable ds = new DataTable(); ds.Columns.Add("Choice"); //ds.Columns.Add("person"); ds.Columns.Add("Curr"); for (int i = 0; i < 3; i++) { DataRow dr = ds.NewRow(); ds.Rows.Add(dr); } grid.DataSource = ds; grid.DataBind(); } catch (Exception ex) { } } void tx_TextChanged(object sender, EventArgs e) { DataTable ds = new DataTable(); ds.Columns.Add("Choice"); ds.Columns.Add("Curr"); for (int i = 0; i < 3; i++) { DataRow dr = ds.NewRow(); ds.Rows.Add(dr); } grid.DataSource = ds; grid.DataBind(); } void grid_RowDataBound(object sender, GridViewRowEventArgs e) { if (e.Row.RowType == DataControlRowType.DataRow) { SPWeb web = SPContext.Current.Web; SPList list = web.Lists["Source for test"]; SPField field = list.Fields["Choice"]; SPListItem item=list.Items.Add(); BaseFieldControl control = (BaseFieldControl)GetSharePointControls(field, list, item, SPControlMode.New); if (control != null) { e.Row.Cells[0].Controls.Add(control); } TextBox tx = new TextBox(); tx.AutoPostBack = true; tx.ID = "Curr"; tx.TextChanged += new EventHandler(tx_TextChanged); e.Row.Cells[1].Controls.Add(tx); } } public static Control GetSharePointControls(SPField field, SPList list, SPListItem item, SPControlMode mode) { if (field == null || field.FieldRenderingControl == null || field.Hidden) return null; try { BaseFieldControl webControl = field.FieldRenderingControl; webControl.ListId = list.ID; webControl.ItemId = item.ID; webControl.FieldName = field.Title; webControl.ID = "id_" + field.InternalName; webControl.ControlMode = mode; webControl.EnableViewState = true; return webControl; } catch (Exception ex) { return null; } } } }

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• what is file verification system for php project or licence checking the configuration files

  - by Jayapal Chandran

  Hi, My colleague asked me a question like "license check to config file". when i searched i got this http://www.google.com/search?q=file+verification+system&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a and in the result i got this http://integrit.sourceforge.net/texinfo/integrit.html but could not grasp much of its idea. Here is my thoughts... Our project is written in codeigniter. The project owner is providing it to their customer. The owner is a business partner with that concept. Besides, the owner needs control of the project code so that the customer will not break rules with him like changing the code or moving it go another server or validity. So the owner needs a system to enable disable the site. Let me give an example... owner.com will have an admin panel where he can either disable or enable the client.com. when he disables the client.com should display a custom message instead of loading the files. client.com is written i a way that i will process requests from owner.com and also the other way round. so, here i want a list of the concepts with which we can implement the ownership and control over client.com any suggestions, links, references, answers will be helpful. If i am missing something in my question i will update my question according to your comments if any so that the users can give in their idea without confusing of what i had asked. THX

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• JPA optimistic lock - setting @Version to entity class cause query to include VERSION as column

  - by masato-san

  I'm using JPA Toplink Essential, Netbean6.8, GlassFish v3 In my Entity class I added @Version annotation to enable optimistic locking at transaction commit however after I added the annotation, my query started including VERSION as column thus throwing SQL exception. None of this is mentioned in any tutorial I've seen so far. What could be wrong? Snippet public class MasatosanTest2 implements Serializable { private static final long serialVersionUID = 1L; @Id @Basic(optional = false) @Column(name = "id") private Integer id; @Column(name = "username") private String username; @Column(name = "note") private String note; //here adding Version @Version int version; query used: SELECT m FROM MasatosanTest2 m Internal Exception: com.microsoft.sqlserver.jdbc.SQLServerException Call: SELECT id, username, note, VERSION FROM MasatosanTest2

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• JSP getParameter problem

  - by user236501

  I have a form, if the timer reach the form will auto redirect to the Servlet to update database. My problem now is if javascript redirect the window to servlet my request.getParameter is null. function verify(f,whichCase){ if(whichCase == "Submit"){ msg = "Are you sure that you want to submit this test?"; var i = confirm(msg) if(i){ parent.window.location = "sindex.jsp" } return i; } } I doing this because i got a iframe in my jsp. Timer update problem have to use iframe. So, when time up or user click submit parent.window.location can let me refresh parent window <form method="POST" action="${pageContext.request.contextPath}/TestServlet" onSubmit="return verify(this,whichPressed)"> My form when user click submit button within the timing, it will trigger the verify function to let user confirm submit. So inside my TestServlet i got this, because using javascript redirect request.getParameter("answer") this keep return me null. protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { if (request.getParameter("Submit") != null) { String ans = request.getParameter("answer"); Answer a = new Answer(ans, no); aa.CreateAnswer(an,t.getTestCode(),username); RequestDispatcher rd = request.getRequestDispatcher("/sindex.jsp"); rd.forward(request, response); } } Below are my timer when time up redirect to TestServlet trigger the doGet method if((mins == 0) && (secs == 0)) { window.alert("Time is up. Press OK to submit the test."); // change timeout message as required var sUrl = "TestServlet"; parent.window.location = sUrl // redirects to specified page once timer ends and ok button is pressed } else { cd = setTimeout("redo()",1000); }

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• How to create a better tables Structure.

  - by user160820

  For my website i have tables Category :: id | name Product :: id | name | categoryid Now each category may have different sizes, for that I have also created a table Size :: id | name | categoryid | price Now the problem is that each category has also different ingredients that customer can choose to add to his purchased product. And these ingredients have different prices for different sizes. For that I also have a table like Ingredient :: id | name | sizeid | categoryid | price I am not sure if this Structure really normalized is. Can someone please help me to optimize this structure and which indexed do i need for this Structure?

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• CSS Selector not working on elements within a div

  - by stevebot

  Hi, I have the following HTML structure: <div class="formFields"> <label> Field 1: </label> <input type="text" value="" name="field1" /> </div> And my CSS selectors are as follows: #formFields {clear:both;} #formFields label {font-weight:bold;} The clear:both; is being applied to the div, but the font-weight:bold; is not being applied to the labels. How would I apply this font-weight to the labels?

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• Best WordPress Video Themes for a Video Blog

  - by Matt

  WordPress has made blogging so easy & fun, there are plenty of video blog themes that you can pick from. However there is always rarity in quality. We at JustSkins have gathered some high quality, tested, tried video themes list. We tried to find some WordPress themes for vloggers, we knew all along that there are very few yet some of them are just brilliant premium wordpress themes. More on that later, let’s find out some themes which you can install on your vlog right now. On Demand 2.0 A fully featured video WordPress premium theme from Press75. Includes  theme options panel for personal customization and content management options, post thumbnails, drop down navigation menu, custom widgets and lots more. Demo | Price: $75 | DOWNLOAD VideoZoom An outstanding premium WordPress video theme from WPZoom featuring standard video integration plus additionally it lets you play any video from all the popular video websites. VideoZoom theme also includes a featured video slider on the homepage, multiple post layout options, theme options panel, WordPress 3.0 menus, backgrounds etc. Demo | Price Single: $69, Developer: $149 | DOWNLOAD Vidley Press75′s easy to use premium WordPress video theme. This theme is full of great features, it can be a perfect choice if you intend to make it a portal someday..it is scalable to shape like a news portal or portfolios. The Theme is widget ready. It has ability to place Featured Content and Featured Category section on homepage. The drop down menus on this theme are nifty! Demo | Price $75 |  DOWNLOAD Live A video premium WordPress theme designed for streaming video, and live event broadcasting. You can embed live video broadcasts from third party services like Ustream etc, and features a prominent timer counting down to the next broadcast, rotating bumper images, Facebook and twitter integration for viewer interaction, theme admin options panel and more make this theme one of its kind. Demo | Price: $99, Support License: $149| DOWNLOAD Groovy Video Woo Themes is pioneer in making beautiful wordpress themes,  One such theme that is built by keeping the video blogger in mind. The Groovy Theme is very colourful video blog premium WordPress theme. Creating video posts is quick and easy with just a copy / paste of the video’s embed code. The theme enables automatic video resizing, plenty of widgets. Also allows you to pick color of your choice. Price: Single Use $70, Developer Price : $150 | DOWNLOAD Video Flick Another exciting Video blogging theme by Press75 is the Video Flick theme. Video Flick is compatible with any video service that provides embed code, or if you want to host your own videos, Video Flick is also compatible with FLV (Flash Video) and Quicktime formats. This theme allows you to either keep standard Blog and/or have Video posts. You can pick a light or dark color option. Demo | Price : $75 | DOWNLOAD Woo Tube An excellent video premium WordPress theme from Woothemes, the WooTube theme is a very easy video blog platform, as it comes with  automatic video resizing, a completely widgetised sidebar and 7 different colour schemes to choose from. The theme  has the ability to be used as a normal blog or a gallery. A very wise choice! Price: Single Use $70, Developer Price : $150 | DOWNLOAD eVid Theme One of the nicest WordPress theme designed specifically for the video bloggers. Simple to integrate videos from video hosts such as Youtube, Vimeo, Veoh, MetaCafe etc. Demo | Price: $19 | DOWNLOAD Tubular A video premium WordPress theme from StudioPress which can also be used as a used a simple website or a blog. The theme is also available in a light color version. Demo | Price: $59.95 | DOWNLOAD Video Elements 2.0 Another beautiful video premium WordPress theme from Press75. Video Elements 2.0 has been re-designed to include the features you need to easily run and maintain a video blog on WordPress. Demo | Price: $75 | DOWNLOAD TV Elements 3.0 The theme includes a featured video carousel on the homepage which can display any number of videos, a featured category section which displays up to 12 channels, creates automatic thumbnails and a lots more… Demo | Price: $75 | DOWNLOAD Wave A beautiful premium video wordpress theme, Flexible & Super cool looking. The Design has very earthy feel to it. The theme has featured video area & latest listing on the homepage. All in all a simple design no fancy features. Demo | Price: $35 | Download

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• HTTP transfer speeds start fast then slows to a crawl

  - by AnITAdmin

  We just got a new dedicated 1 gigabit server running IIS. The CPU is 15% or less, the RAM (4 GB total) has 3 GB unused... We are pushing 110 mbits per second... Speeds are really slow.. And, if fact, here's how it happens: We connect, and then the speeds are really fast, and quickly decline to 40 kBps or less. What's going on? It seems the server just wont go above 120 mbits per second. The files are all very large. 50 MB to 500 MB... Could this be a factor? Again, CPU, RAM, UI responsiveness when accessing remotely all seem fine.

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• LYNC / OCS... problems getting edge server working.

  - by TomTom

  New setup Lync 2010 (i.e. OCS 2010). I have serious problems getting my edge system going. Internally things work fine. Externally I am stuck. I have used the tester at https://www.testocsconnectivity.com/ and it also fails. NOTE: I use the domain xample.com / xample.local here just as example. Here is the setup. I have 2 internal hosts (lync.xample.local, edge.xample.local). edge.xample.com is also correctly in dns. and points to the edge.xample.local external assigned ip address (external interface). Externally, I have the following dns entries: edge.xample.com _sip._tcp - edge.xample.com 443 _sipfederationtls._tcp - edge.xample.com 5061 _sipinternaltls._tcp - lync.xample.local 5061 _sip._tls - edge.xample.com 443 My problem is that the ocs connection test always ends up trying to contact lync.xample.local (i.e. the internal address) when connecting to [email protected]. The error is: Attempting to Resolve the host name lync.xample.local in DNS. This shows me it clearly manages to connect to SOMETHING, but it does either fall through to the _sipinternaltls._tcp entry, OR it does get that internal entry wrongly from the edge system. Am I missing some entries or have some wrong?

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• Are VLANs necessary for my environment?

  - by kleefaj

  Greetings. I'm the new network manager for a school. I've inherited an environment made up of several Windows servers, about 100 Windows clients, ten printers, one Cisco router, six Cisco switches, and 1 HP switch. Also, we're using VoIP. There are four floors in our building. The hosts on each floor are assigned to a separate VLAN. An office on the first floor has its own VLAN. All the switches are on their own VLAN. The IP phones are on their own VLAN. And the servers are on their own VLAN. For the number of hosts on the network, are all these VLANs really buying me anything? I'm new to the VLAN concept but it seems overly complicated for this environment. Or it's genius and I just don't get it. Any thoughts? Thanks, Jeff

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• Using Windows XP Mode Virtual Machine on a Domain

  - by DavidStein

  I've followed the instructions and installed and configured the Windows Virtual PC XP Mode. I've added it as a machine on the network and can log into it and use network resources. In the process I removed the saved credentials, which are just a default local login to the VM. I need to know how to set this so that the VM auto logs in with the domain account credentials used to log into the physical computer. Google hasn't helped me find the answer.

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• suddenly can't connect to windows 7 pc from xbmc

  - by Damon

  I have xbmc installed on a softmodded classic xbox and all of a sudden I cannot connect to the shared folders on my windows 7 PC. Well, it can connect but it wants a username and password, but none exist on my computer. It's been several weeks since I last used it, but it was working fine then! and no particular changes I can think of aside from I guess a few windows updates. I've seen reference online to windows live essentials causing issues with file sharing, but I don't even have that installed. And I made sure to tick 'turn off password protected sharing' in my advanced network setup. I had the guest account turned off and working fine before, and tried turning it on but no luck. I can access my shared folders fine from other Computers and a ps3. I've read a couple threads of similar situations on various folders and none of their solutions have worked.

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• Is it dangerous to add/remove a hard-drive to a Windows machine which is in stand by?

  - by Adal

  Can I add a SATA drive to a Windows 7 machine which is in standby mode? The hardware supports hot-plug. Could pulling the drive out while in standby corrupt the data on the drive (unflushed caches, ...)? Does Windows flush before standing by? How about swapping a drive with another drive of different kind (SSD - mechanical disk) and size, also while in stand-by. Could the OS when waking up believe that the old drive is still there, and write to it and thus corrupt it, since the new one has different partitions and data?

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• Upgrading disks in WD My Book Studio Edition II

  - by Bryan

  About 18 months ago, I purchased a 1Tb Western Digital My Book Studio Edition II for backup of my home system. It has 2x 500Gb drives in it, which I had configured as RAID 1. One of the disks has now died, and rather than replace like for like, I'd like to replace both drives to increase the capacity (2 x 2Tb would be nice). I'm struggling to find a list of compatible drives, has anyone else upgraded theirs?

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• How do I keep windows XP from automatically changing the screen resolution?

  - by roamn

  I have an Asus EEEBox (EB202, intel GMA 950) hooked up to my 1080p TV (DVI-HDMI cable). I use it to watch standard definition movies and TV shows. I prefer to run at 1280x720 so that I can see things more easily, but every time I turn off the TV, then back on again, the resolution defaults to 1080p (1920x1080). How can I force a specific resolution? If that's not possible, is there a way to use a batch script to switch to the desired resolution faster?

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• Sharing iTunes Library Between Mac & PC Via A NAS

  - by Franco

  Hi Everyone, I'd be really grateful if anyone can help me with this, I spent literally days trawling the net before I came across this site, which seems to have very knowledgable people! So, the problem is: For years I've had a couple of PCs and a NAS drive. I've been storing all my music on the NAS drive and then accessing the library on whichever PC I wanted to by pointing both PCs to the NAS drive iTunes files. The good thing is I can see all my playlists and song ratings etc. Now, I've just bought a Macbook Pro as well. And I want to be able to access the same music, song ratings etc on this machine. I've tried simply holding down option and navigating to the .itl files that my Windows machine created, but that doesn't work. Is there some way to use the same iTunes Library (apart from home sharing) on both machines? Thank you so much for reading this.

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• Should I worry about making my picasa web albums public?

  - by Motti

  I choose the public option for all my albums in Picasaweb, these mostly (90%) contain pictures of my children which I share with my family. Ever so often somebody I don't know adds me as a favorite, at current count I have 7 people in my fan list (non of whom I know) and only three of them have any public albums. Is this creepy? I take care not to upload any pictures that may attract perverts What would you recommend, private by default or continue with public?

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• Where is SQLite on Nokia N810? How to get?

  - by klausnrooster

  I need SQLite3 with the TCL interface for a simple command-line app I use on all my PCs and want to use on my new (to me) Nokia N810. But "find" does not find any SQLite on the Nokia N810. Several apps use it, supposedly, like the maps/gps (poi.db), and others. I got sudo gainroot before using find, tried with wildcards * and dot . No luck. I guess it's embedded in the apps that use it? The N810's app manager doesn't offer SQLite. Apt-get has it and then fails with error: "Unable to fetch some archives, ..." The "update" and "--fix-missing" options do not help. I don't really want to get scratchbox and compile SQLite and TCL extension for it from sources. I looked at README and it seems like it might be straightforward. However [1] it's not clear what scratchbox download I would need (there are dozens in the Index of /download/files/sbox-releases/hathor/deb/i386), [2] I've never compiled any C sources successfully before, [3] and the whole mess entails a lot of learning curve for what is a very small one-off personal project. http://www.gronmayer.com/ has a few (sqlite (v. 2.8.17-4), libsqlite0 (v. 2.8.17-4), and libsqlite0-dev (v. 2.8.17-4)) but they appear to part of some huge package, may or may not include the TCL interface, ... and no I don't want to port my tiny app to Python. Is there some option I've overlooked? Must I get scratchbox and compile for ARM myself? Thanks for your time.

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• Does the Ubuntu One sync work?

  - by bisi

  I have been on this for several hours now, trying to get a simple second folder to sync with my (paid) account. I cannot tell you how many times I removed all devices, removed stored passwords, killed all processes of u1, logged out and back in online...and still, the tick in the file browser (Synchronize this folder) is loading and loading and loading. Also, I have logged out, rebooted countless times. And this is after me somehow managing to get the u1 preferences to finally "connect" again. I have also checked the status of your services, and none are close to what I am experiencing. And I have checked the suggested related questions above! So please, just confirm whether it is a problem on my side, or a problem on your side.

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• SMS ad service for a php app.

  - by BandonRandon

  I am about to launch a website that allows the end user to get alerted as their bus approches the stop. The only problem was this is a little expensive as I'm paying about 5 cents per alert. I was thinking that if i added a short message something like "brought to you by acme co" at the end of the message I may be able to recoup cost without making my service a paid one. Anyone know of any SMS ad companies or how one would go about finding one. Google has failed me, probably searching for the wrong thing.

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• Quickly determine if a number is prime in Python for numbers < 1 billion

  - by Frór

  Hi, My current algorithm to check the primality of numbers in python is way to slow for numbers between 10 million and 1 billion. I want it to be improved knowing that I will never get numbers bigger than 1 billion. The context is that I can't get an implementation that is quick enough for solving problem 60 of project Euler: I'm getting the answer to the problem in 75 seconds where I need it in 60 seconds. http://projecteuler.net/index.php?section=problems&id=60 I have very few memory at my disposal so I can't store all the prime numbers below 1 billion. I'm currently using the standard trial division tuned with 6k±1. Is there anything better than this? Do I already need to get the Rabin-Miller method for numbers that are this large. primes_under_100 = [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97] def isprime(n): if n <= 100: return n in primes_under_100 if n % 2 == 0 or n % 3 == 0: return False for f in range(5, int(n ** .5), 6): if n % f == 0 or n % (f + 2) == 0: return False return True How can I improve this algorithm?

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