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  • debugging JBoss 100% CPU usage

    - by Nate
    We are using JBoss to run two of our WARs. One is our web app, the other is our web service. The web app accesses a database on another machine and makes requests to the web service. The web service makes JMS requests to other machines, aggregates the data, and returns it. At our biggest client, about once a month the JBoss Java process takes 100% of all CPUs. The machine running JBoss has 8 CPUs. Our web app is still accessible during this time, however pages take about 3 minutes to load. Restarting JBoss restores everything to normal. The database machine and all the other machines are fine, only the machine running JBoss is affected. Memory usage is normal. Network utilization is normal. There are no suspect error messages in the JBoss logs. I have set up a test environment as close as possible to the client's production environment and I've done load testing with as much as 2x the number of concurrent users. I have not gotten my test environment to replicate the problem. Where do we go from here? How can we narrow down the problem? Currently the only plan we have is to wait until the problem occurs in production on its own, then do some debugging to determine the cause. So far people have just restarted JBoss when the problem occurred to minimize down time. Next time it happens they will get a developer to take a look. The question is, next time it happens, what can be done to determine the cause? We could setup a separate JBoss instance on the same box and install the web app separately from the web service. This way when the problem next occurs we will know which WAR has the problem (assuming it is our code). This doesn't narrow it down much though. Should I enable JMX remote? This way the next time the problem occurs I can connect with VisualVM and see which threads are taking the CPU and what the hell they are doing. However, is there a significant down side to enabling JMX remote in a production environment? Is there another way to see what threads are eating the CPU and to get a stacktrace to see what they are doing? Any other ideas? Thanks!

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  • Use mod_rewrite to force users to homepage when entering a site?

    - by scotru
    Is it possible to use mod_rewrite to force all users entering a site (either through a link from another site, or by typing a URL in the address bar) to be redirected to the homepage? From the homepage (or any page within the site), users should then be able to access other pages in the site. But all users would be forced to enter the site through the homepage. Can this be done with mod_rewrite (or without using a scripting language)?

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  • How to "Create Your Own Search Provider" in IE9 and later?

    - by GaTechThomas
    We used to be able to add a custom search provider in Internet Explorer to search any site that put search words in the query string (such as in StackExchange sites). The page where that it was done was http://www.ieaddons.com/gb/createsearch.aspx However, this page now redirects to a generic IE Gallery page. When I upgraded from IE8 to IE9, my StackOverflow provider carried over, but I recently reset my browser settings and am not able to get it back. Can we easily create a custom search provider?

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  • excel 2007 enter new date

    - by Lalajee
    I’m try to create a excel template which will have three fields I like to update automatically when it’s open. Fields which this template will have Current Date: 02/07/2012 Sheet Number: 25 Between Date: 02/07/2012 to 02/08/2012 When I open this template after 03/08/2012 this sheet will have new data Current Date: 03/08/2012 Sheet Number: 26 Between Date: 03/08/2012 to 02/09/2012 For current date Private Sub Workbook_Open() ThisWorkbook.Worksheets("Sheet1").Range("A1").Value = Date End Sub Can this be done using excel function or do I need to use VB and also how do I update template automatically with new values to say next time use these dates.

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  • Bridging two wireless interfaces with brctl?

    - by AK_
    I have this topology: [internet] ^ L-------[wlan0]-[host]-[wlan1]-----[client-1] I tried to bridge wlan0 wlan1 but it wont work with brctl; but magically when I issue this command #iw set dev wlan0 4addr on it adds wlan0 to the bridge BUT I lost all internet connection and I was unable to hook it to the internet router. can somebody please explain why did that happen and is there a way to get this done ?

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  • Lenovo Windows 8 EFI restore from image

    - by anderhil
    First time here. I have bought e530 with windows 8 and the first hour of work with it i have a problem. I have ssd with windows 7 which i want to use with my new e530. I have made a sysprep of win 7 and installed ssd to the e530. The HDD which was inside e530 i want to use as second hdd instead of my DVD Drive. I connected this HDD through usb-to-sata adapter to copy some files from ssd to the hdd. Unfortunately it didn't see the file system on the HDD (but first time i have booted to it and first boot into Windows 8) I've made some mistakes and i corrupt the filesystem on the hdd. I tried bunch of tricks to recover the GPT, but it didn't work. I have managed to recover the Lenovo_Recovery partition to my ssd using recovery tools. And now I'm stuck, with this new things to me - EFI, GPT, etc i don't how this stuff works, and i have been trying to understand this for hours - but nothing seems to work. I want to restore the Windows 8 to the hdd, so it is there alive. What i have done so far: Formated the HDD I took the PBRALL file from the Lenovo_Recovery " convert gpt create partition Primary size=1000 ID=DE94BBA4-06D1-4D40-A16A-BFD50179D6AC gpt attributes=0x8000000000000001 assign letter=W format quick LABEL=WINRE_DRV create partition efi size=260 assign letter=s format quick fs=fat32 LABEL=SYSTEM_DRV create par msr size=128 create partition primary noerr assign letter=t format quick LABEL=Windows8_OS shrink desired=12197 create partition Primary ID=DE94BBA4-06D1-4D40-A16A-BFD50179D6AC gpt attributes=0x8000000000000001 assign letter=q format quick LABEL=Lenovo_Recovery " it recreated the partitions copied contents of SDRIVE.zip to SYSTEM_DRV partition copied contents of WDRIVE.zip to WINRE_DRV partition Copied restored Lenovo_Recovery back to Lenovo_Recovery partition So now I have 3 system partitions: SYSTE_DRV BOOT boot.sdi EFI BOOT bootx64.efi LenovoBT.efi Lenovo ... Microsoft ... WINRE_DRV\Recovery\WindowsRE\winre.wim Lenovo_Recovery (whic contains install.wim and bunch of other things) So i put back the HDD inside the laptop and tried to boot - but nothing works. It just doesn't boot to anything - no errors - nothing at all. When I choose this HDD manually for boot - just black screen blinks and that's all - it returns back to the devices boot menu. SYSTEM_DRV is EFI partition, so I don't understand why it doesn't boot, it has files needed inside. Can anybody tell me what should be done to make it boot to recovery console or smth like that? How to restore the Windows 8 from the Lenovo_Recovery install.wim image? As I understand I have all the files where they should be, but why it doesn't work? How to troubleshoot such things? Also, if somebody has good link where EFI booting process is explained in details that would be great. Cause i still don't understand how it knows what partition to boot?

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  • DNS MX record workaround

    - by onemach
    I use a tk domain name and another web host to host my blog site. I redirect DNS query to xxxhost.[myhost].com and tell my web host my domain name. (since my web host is virtual one) This works OK. But now I want to use an email service provided by third party, which requires adding a MX record to my DNS service. But this cannot be done on my web host management pages. Is there any workaround for this?

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  • How to disable wifi usage on Windows 7

    - by Eric
    On a laptop, we currently use LAN(RJ45) connection to access internet. But from time to time, on startup, the laptop "catch" an unsecured wifi hotspot from one of my neighbors, so we would like windows 7 to NOT choose any wifi network : how this can be done ?

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  • how do I stop excel from adding double quotes to my formula

    - by Alex
    this works: {=MEDIAN((Table1[MonthFinish]=201012)*(Table1[Days]))} but if I put 201012 into cell A3, this doesn't done work: {=MEDIAN((Table1[MonthFinish]=A3)*(Table1[Days]))} when i do Evaluate Formula on the 2nd one...I see that there are double quotes about the 201012 that was pulled from A3...like so: {=MEDIAN((Table1[MonthFinish]="201012")*(Table1[Days]))} and as such, all the 201012s pulled from the MonthFinsh row come back as FALSE when compared to "201012" (ie, 201012="201012" ) where as they come back as TRUE when I hard code 201012 as it shows up as 201012=201012. how do i get even to not put those quotes around the number?

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  • Print from MAC OS 10.5.8 to HPC3180 on Windows 7, How?

    - by Tom Groszko
    Can anyone point to a document that describes how to print from a Max OS 10.5.8 to an HP Photosmart C3180 series print connected to Windows 7. I can’t get anything but nonsense to print. I was able to do this with Windows XP, could not do it with Vista and am now hopping to get it done with System 7. HP has been no help at all. Apparently nobody who works for them knows anything about both computers.

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  • smtp(s) proxy to monitor outgoing spam

    - by Zulakis
    I am looking for a smtp proxy to install on our gateway which should monitor outgoing smtp traffic to identify the source of recently occuring spam attacks from our network. It would be enough if this could log all outgoing mails, no actual filtering must be done as I'm going to do this manually. Also, is it possible to monitor smtps ports 465 and 587 or is it necessary to completely block these ports to stop spam?

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  • How can I create a cron job that runs a task every three weeks?

    - by itj
    I have a task that needs to be performed on my project schedule (3 weeks). I'm able to set up cron to do this every week, or (for example) on the 3rd week of every month - but can't find a way to do this every three weeks. I could hack the script to create temporary files (or similar) so it could work out it was the third time it has been run - but this solution smells. Can it be done in a clean way?

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  • file transfer automation

    - by rizen
    Server A generates a file and scp's it to Server B. I have cron running on Server B that each minute looks for new files that were copied over. My question is- how can Server B ensure that the file that was copied over is actually done being copied? I don'y want to start processing the file unless it's been fully written to. Is this possible to determine?

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  • Changing default playback device on Windows 8

    - by emartel
    Previously, on Vista and Windows 7, changing the Default Playback device would occur instantly. For example, audio is coming out of my speakers, I right click the Volume Control, click Playback Devices then I select another device and click Set Default. Audio would be transferred immediately. Unfortunately, now, with Windows 8, I need to kill whatever process what outputting sound, and restart it for the change to take effect. Is there something that can be done about it so that changes are taken into account immediately?

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  • Can I change a user password in Linux from the command line with no interactivity?

    - by Paul Hoffman
    I have a specific use case where I would really like to be able to change a user's password with a single command with no interactivity. This is being done in a safe fashion (over SSH, and on a system with only one user able to be logged in), so it's fine to expose the new password (and even the old one, if necessary) on the command line. FWIW, it's a Ubuntu system. I just want to avoid having to add something Expect-like to this system for just this one task.

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  • Tcp Port Open by Unknown Service

    - by Singularity
    Running openSUSE 11.2 x86_64. Here's what a nmap of my IP provides: PORT STATE SERVICE 23/tcp open telnet 80/tcp open http 2800/tcp open unknown 8008/tcp open http I would like to know How to view What service is causing Port 2800 to be opened? A few search engine results led me to believe that it is supposedly a port opened by a Trojan called "Theef". If it is indeed a Trojan, what can be done to weed it out? Is my desktop's security compromised?

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