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  • The Back Side of Exceptions

    This article illustrates the risks of exceptions being thrown where it is generally not expected, e.g., a library function or a finally block, and shows ways to prevent some insidious errors (such as inconsistency of program data or loss of exception information).

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  • State Transition Constraints

    Data Validation in a database is a lot more complex than seeing if a string parameter really is an integer. A commercial world is full of complex rules for sequences of procedures, of fixed or variable lifespans, Warranties, commercial offers and bids. All this requires considerable subtlety to prevent bad data getting in, and if it does, locating and fixing the problem. Joe Celko shows how useful a State transition graph can be, and how essential it can become with the time aspect added.

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  • I am now ready to publish my commercial Android/IPhone/Anything application - what disclaimers should I use to protect myself?

    - by corgrath
    I have now written my last line of code and I am ready to publish my application to the Android Market, what disclaimers should I add to protect myself as a developer from customers who purchase my application, to prevent being sued by stupid people? It might be a harsh question, but how does developers protect themselves when publishing their software? Developers or small companies (for example all these iPhone/Android developers) that can't afford hiring a small army of lawyers, what should they do? Any solid text I can use?

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  • How to avoid oscillation by async event based systems?

    - by inf3rno
    Imagine a system where there are data sources which need to be kept in sync. A simple example is model - view data binding by MVC. Now I intend to describe these kind of systems with data sources and hubs. Data sources are publishing and subscribing for events and hubs are relaying events to data sources. By handling an event a data source will change it state described in the event. By publishing an event the data source puts its current state to the event, so other data sources can use that information to change their state accordingly. The only problem with this system, that events can be reflected from the hub or from the other data sources, and that can put the system into an infinite oscillation (by async or infinite loop by sync). For example A -- data source B -- data source H -- hub A -> H -> A -- reflection from the hub A -> H -> B -> H -> A -- reflection from another data source By sync it is relatively easy to solve this issue. You can compare the current state with the event, and if they are equal, you don't change the state and raise the same event again. By async I could not find a solution yet. The state comparison does not work by async event handling because there is eventual consistency, and new events can be published in an inconsistent state causing the same oscillation. For example: A(*->x) -> H -> B(y->x) -- can go parallel with B(*->y) -> H -> A(x->y) -- so first A changes to x state while B changes to y state -- then B changes to x state while A changes to y state -- and so on for eternity... What do you think is there an algorithm to solve this problem? If there is a solution, is it possible to extend it to prevent oscillation caused by multiple hubs, multiple different events, etc... ? update: I don't think I can make this work without a lot of effort. I think this problem is just the same as we have by syncing multiple databases in a distributed system. So I think what I really need is constraints if I want to prevent this problem in an automatic way. What constraints do you suggest?

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  • How to fix footer cutting off content in an above div [closed]

    - by sqyttles
    I am working on this web page: https://ws.missouristate.edu/factbook/execsummary/ and as you can see the page footer is covering the content. I have tried to adjust many CSS properties such as overflow, position, height, float, etc. in firebug and none of my edits have had any positive effect. I am even using a clearing div. Perhaps I am overlooking something pretty easy. How do I prevent the footer from covering up the table content?

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  • How to Enable Click To Play Plugins in Google Chrome

    - by Taylor Gibb
    Have you ever opened a webpage only to have all sorts of multimedia on the page just start playing? Chrome has a hidden setting that was designed to prevent situations just like that. Read on to find out how to enable it. HTG Explains: What is the Windows Page File and Should You Disable It? How To Get a Better Wireless Signal and Reduce Wireless Network Interference How To Troubleshoot Internet Connection Problems

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  • Do I need to physically host my website in separate countries for SEO?

    - by noelmcg
    I run an ecommerce store that is hosted in Ireland, and ranks ok with google.ie The market for this comapny is the Republic of Ireland and the UK. Is it beneficial for me to have a UK hosted version of my site (.co.uk) to rank higher in google.co.uk (and other localised search engines of course). If so, how would I prevent the site from being punished for duplicate content? Thanks in advance for any assistance on the above.

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  • Hot Off the Presses! Get Your Early Release of the December Procurement Newsletter!

    - by MargaretW
    Get all the recent news and featured topics for the Procurement modules including Purchasing, iProcurement, Sourcing and iSupplier. Find out what Procurement experts are recommending to prevent and resolve issues.  Webcast information and important links are also included.  The December newsletter features articles on: Ø Maximizing your search results to include the Procurement Community Ø Concurrent Processing Analyzer Ø Preventing FRM-40654 errors And there is much, much more….. Access the newsletter now:  DocID: 111111.1

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  • how can I change user permission settings for an application

    - by naftalimich
    I am trying to prevent the guest user from accessing software-center (I know it can't install anything, but I don't even want it to browse) The file is owned by root and in group root. I run: sudo chmod o= /usr/bin/software-center Afterwards I run ls -l and get the following output: lrwxrwxrwx 1 root root 40 Sep 10 14:28 /usr/bin/software-center -> ../share software- center/software-center The first part of the output indicates chmod didn't do anything and the second part I don't understand.

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  • how to disable luks partition from showing up in nautlus panel

    - by yemu
    I have a luks setup with encrypted partition. And I don't want everyone on my computer to see that I have such partition. Unfortunately it shows up in the nautilus "devices" panel as "Encrypted partition". Is there a way to prevent it from showing there? I plan to setup authentication with a keyfile on usb, but for now I can live without the gnome authentication dialog, and open and mount the partition from command line.

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  • Box2d contant speed before and after collision

    - by bobenko
    I want to make my body fly at constant speed, how to make it fly at constant speed before and after collision? I set restitution of my body to 1.0 but after some direct and powerful collisions my objects begins to slow, I want it to fly same speed as before. I heard this can be done by setting liner damping of the object, I think it can prevent only from fast flying objects not slow. Thanks in advance.

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  • How to move domain from 1&1 to fasthosts with minimum downtime [duplicate]

    - by arcanine
    This question already has an answer here: Changing web hosting companies 1 answer How can we move our domain name from 1&1's control over to our new host with as little affect (if any) on downtime for our domain name. We've tried moving name servers before and our site went dark despite us defining all the old records on to the new name server host, now this time we're going to move the entire domain to another company but we've been bit so many times by this that I'm trying to find out what the process should be, and whether it can be done in a way to prevent down time

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  • How can you store item data from a game?

    - by ThePlan
    When I look at games such as warcraft 3, or Diablo, or basically any games that contain items in them I notice that each item is unique. They all have different stats, different graphics, different names. I took a wild guess that they don't use XML, although I know I might be wrong, but I just figured they use something that isn't easily human-editable to prevent casual hacking. How is data such as item attributes stored in a game (2d or 3d, I suppose it works the same way in both)?

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  • Why can any user read the content in my homedir?

    - by Digiplace
    Why is it that the default setting makes it possible for user A to look in the homedir of user B and vice versa? And furthermore..that user can not only look into the homedir of another user, he can also open any document he wants to. It feels very insecure to me. There should be more privacy for users. I know how to prevent this situation, but it puzzles me why this should be possible in the first place.

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  • How to disable monitor auto detection in Windows 7?

    - by Jay Yother
    I am currently running Windows 7 Ultimate 64-bit with a dual monitor setup with an NVIDIA 7950 GT graphics card. One monitor is dedicated to this machine and the other monitor is connected to a DVI KVM switch. When I switch to my other computer, Windows 7 disables the monitor. However, when I switch back it does not re-enable the monitor. The only circumstance that automatically re-enables the second monitor is when I switch back after Windows has put the monitors into power save mode. I am continually having to bring up the NVIDIA control panel to have it re-enable the monitor. Under Windows XP I would just disable the NVIDIA service to prevent it from auto-detecting the monitor (which doesn't solve the problem under Win7), and in Vista there was a registry hack that would prevent this. It looks as though that has been removed in Windows 7. I have found similar questions posted on this site, but nothing that matches my problem exactly. The following link is the question that comes the closest, but does not provide a solution to the problem. http://superuser.com/questions/96683/how-to-fix-monitor-detection-on-windows-7 Is there a way in Windows 7 to disable monitor auto-detection?

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  • iSCSI errors continue after removing inaccessible target portal

    - by Ansgar Wiechers
    By mistake I entered an iSCSI target portal address in the iSCSI Initiator on one of our virtual servers that does not have an address in the network range used for iSCSI. This caused the following errors/warnings to appear in the eventlog: Log Name: System Source: MSiSCSI Event ID: 113 Level: Warning Description: iSCSI discovery via SendTargets failed with error code 0xefff0003 to target portal *192.168.23.42 0003260 Root\ISCSIPRT\0000_0 . Log Name: System Source: iScsiPrt Event ID: 1 Level: Error Description: Initiator failed to connect to the target. Target IP address and TCP Port number are given in dump data. Log Name: System Source: iScsiPrt Event ID: 70 Level: Error Description: Error occurred when processing iSCSI logon request. The request was not retried. Error status is given in the dump data. So far that's expected beahvior, so I removed the portal from the iSCSI Initiator as described in MSKB 976072. However, the errors/warnings keep appearing every hour, even though neither iSCSI Initiator GUI nor iscscli show any portals: C:\>iscsicli ListTargetPortals Microsoft iSCSI Initiator Version 6.1 Build 7601 The operation completed successfully. The problem persists after rebooting the server. Uninstalling the Microsoft iSCSI Initiator device via devmgmt.msc as well as changing the Initiator parameters like this: [HKLM\SYSTEM\CurrentControlSet\Control\Class\{4D36E97B-E325-11CE-BFC1-08002BE10318}] "MaxPendingRequests"=dword:00000001 "MaxConnectionRetries"=dword:00000001 "MaxRequestHoldTime"=dword:00000005 didn't help either. Each change was followed by a reboot. Disabling the device does prevent the errors/warnings from re-appearing, of course, but I'd rather not have to resort to this. How can I prevent those errors and warnings from appearing (short of disabling the initiator device or re-installing the server)? What am I missing? Environment: The virtual machine runs on a Hyper-V cluster managed by SCVMM 2012. Hosts and guests run Windows Server 2008 R2 SP1. The physical machines are Dell PowerEdge M710HD blades.

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  • Windows Server 2008 DHCP with RRAS

    - by Guillermo Prandi
    I have a Windows Server 2008 R2 which is a member of a domain, but is placed in a remote location. The server is directly connected to Internet. Clients need to access a particular insecure TCP service in this server (ports 9730 and 9731). Since clients have dynamic IP addresses I cannot know in advance, I thought it would be nice to have them connected through a VPN in order to access the insecure service, but ONLY to access that service, like this: Client ------> VPN TUNNEL ------> (Insecure service at Server) | \----> (Normal internet access) I'd enable the insecure ports in the firewall only from VPN accesses. For this I configured RRAS in the server and gave it a static IP address range (172.19.1.2 through 172.19.1.254) to serve the clients. First I thought I could use DHCP to assign the addresses, but I cannot use DHCP in my LAN connection (not allowed by the hosting service). I tried configuring DHCP binding it to a Microsoft Loopback Adapter, but that's not supported as a DHCP source by RRAS. What I want to accomplish is to send specific DHCP options to the client (network mask, routing table, etc.). In particular: Prevent the client from having the server as default router (without changing the client's "use default gateway in remote network"). Have it as a route for the server's internal RRAS address only (172.19.1.1). Prevent the client from using a 255.255.0.0 mask for the 172.19.x.x network (a 255.255.255.0 mask would be better). Can I do that with RRAS only? How? Currently, the only solution I can think of is to use DHCP in the LAN adapter, but filter DHCP packets so they don't reach the provider's network. However, I'm not sure if that will work. Any suggestions are welcomed! Guille

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  • Prohibit installers from modifying Windows Firewall rules

    - by Sysadmin
    Some application installers tamper with the Windows Firewall rules. I would like to prohibit such automated modifications of the Windows Firewall rules on Windows 7 machines (which use the Windows 7 version of Windows Firewall). Is there some setting that would accomplish this, or would it be necessary to resort to hooking the Windows Firewall API? I would like to prevent these modifications from being made at all, rather than backing up the firewall rules before the installation and restoring them afterward. A TechNet article indicates that there is no way to prevent installers from accessing the Windows Firewall API, but that article pertains to the Windows XP version of Windows Firewall. The Windows 7 version of Windows Firewall is newer and much-improved over the Windows XP incarnation, so it is unclear whether that advice is still pertinent. A similar SuperUser question had received a couple of responses, but neither response answered the question, likely because they misunderstood that question due to the way it was worded. I hope that I have explained this problem clearly. Don't hesitate to ask if you need any clarification.

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