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  • Learning advanced java skills

    - by moe
    I've been programming in java for a while and I really like the language, I've mostly just done game programming, but I want to get a feel for some of the more commonly used api's and frameworks and just get a generally more well-rounded grasp of the language and the common libraries in the current job market. From what I found things like spring, hibernate, and GWT are pretty in demand right now. I looked at some tutorials online and they weren't hard to follow but I really felt like I had no context for what I was learning - I had no idea how any of it would be use in a real work environment. I know nothing can rival the benefit I'd get from actual work experience but that's not an option for me right now, I need another way to learn these technologies in a way where I'll at least feel comfortable working with them and know what I'm doing beyond just understanding what code does what. I checked out a few books but they were all really old(like pre-2006, am I right to assume those books would be kind of out of date today?) or required experience with libraries that I didn't have and can't get. I hate getting stuck looking for the best resource to learn something instead of spending my time actually learning. All I really want is someone to point me to a resource(website or ebook) that is aimed at already experienced java developers and will not only teach me some interesting useful java technology(anything that is useful, I dont know much outside of graphics libraries and game related things so I was thinking some database or web programming api's) but also give me a good perspective of it and leave me feeling confident that I could actually use what I learned on a practical application. If my post makes you think I'm not yet experienced to be learning these things, which I doubted earlier today but am now starting to question, then what do you think is the next step for me? I just want to get better at java. Thanks everyone

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  • Start daemon after specific samba share is mounted

    - by getack
    I have a homebrew headless NAS running 12.04. In it I have a bunch of disks that are presented as a samba share thanks to Greyhole. If I want to do anything to the files within this share, I must do it through greyhole so that everything is updated properly. Thus, the share must be mounted locally and then accessed from there if I want to work on the files from the local machine. I do this mounting automatically thanks to these instructions. I also have Deluge installed that takes care of all my torrenting needs. Deluge's default download location is in this share, so that all the downloads are immediately available to the rest of the network. Obviously for everything to work, the share must be mounted, otherwise Deluge is going to have a problem downloading to it. The problem is, it seems like Deluge is starting before the shares are mounted when the system boots. So downloading/seeding does not continue automatically after boot. I have to log in and force a manual rescan and start on each torrent otherwise all the torrents just hangs on the error. Is there a way I can make deluge start after the shares got properly mounted? I looked into Upstart's emits functionality but I cannot seem to get it to work properly. Any advice?

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  • DELETE method not working in Apache 2.4

    - by Xavi
    I'm running Apache 2.4 locally and dealing with RESTful services authenticating through OAuth. GET, PUT and POST work fine but I can't get DELETE to work. I've tried installing WebDAV and mod_dav, overriding methods in .htaccess, tried Limits, force (enable) DELETE options in configuration and pretty much everything I've found in Google and StackExchange. Here's a copy of my .htaccess right now: <IfModule mod_rewrite.c> Header add Access-Control-Allow-Origin: * Header add Access-Control-Allow-Headers: Authorization Header add Access-Control-Allow-Headers: X-Requested-With Header add Access-Control-Request-Method: HEAD Header add Access-Control-Request-Method: GET Header add Access-Control-Request-Method: PUT Header add Access-Control-Request-Method: DELETE Header add Access-Control-Request-Method: OPTIONS Options +FollowSymlinks Options -Indexes RewriteEngine on RewriteRule ^(.*)\.* index.php [NC,L] </IfModule> Chrome's console shows: XMLHttpRequest cannot load http://dev.server.com/cars/favourite/. Method DELETE is not allowed by Access-Control-Allow-Methods. Is there anything I am missing?

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  • Apache, and logrotate instances

    - by OlivierDofus
    Hi! If I have one website and I want to rotate its logs, there's one instance of logrotate that is launched. There are as many logrotate instances launched as they are virtual websites. Here you can find mod_log_rotate, with a 1.3 version and (only) 2.0 version: http://www.hexten.net/wiki/index.php/Mod-log-rotate It's 6 years old. Is there something new, or maybe is there something like that in recent Apache versions? I didn't find anything like that, and I don't know if this code is still "usable" for recent Apache versions (2.2.x) Don't hesitate to edit my post to make it proper English, thanks a lot!

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  • Does not recognize usb sticks and drives

    - by Peter
    When connecting any usb stick to my thinkpad ubuntu 10.10 does not recognize them. I don't see anything on the desktop. the output of "dmesg | tail -n10" gives me: [ 1965.696388] hub 1-0:1.0: unable to enumerate USB device on port 1 [ 1965.884537] hub 1-0:1.0: unable to enumerate USB device on port 1 [ 1966.072503] hub 1-0:1.0: unable to enumerate USB device on port 1 [ 1966.260349] hub 1-0:1.0: unable to enumerate USB device on port 1 [ 1966.506227] usb 1-1: new high speed USB device using ehci_hcd and address 9 [ 1966.572375] hub 1-0:1.0: unable to enumerate USB device on port 1 [ 1966.760379] hub 1-0:1.0: unable to enumerate USB device on port 1 [ 1966.948358] hub 1-0:1.0: unable to enumerate USB device on port 1 [ 1967.136335] hub 1-0:1.0: unable to enumerate USB device on port 1 [ 1967.325423] hub 1-0:1.0: unable to enumerate USB device on port 1 When connecting my usb scanner to the same port: [ 2008.480135] usb 1-1: new high speed USB device using ehci_hcd and address 65 [ 2008.548389] hub 1-0:1.0: unable to enumerate USB device on port 1 [ 2008.736786] hub 1-0:1.0: unable to enumerate USB device on port 1 [ 2008.924379] hub 1-0:1.0: unable to enumerate USB device on port 1 [ 2009.112348] hub 1-0:1.0: unable to enumerate USB device on port 1 [ 2009.300443] hub 1-0:1.0: unable to enumerate USB device on port 1 [ 2009.488536] hub 1-0:1.0: unable to enumerate USB device on port 1 [ 2009.732180] usb 1-1: new high speed USB device using ehci_hcd and address 71 [ 2014.796299] hub 1-0:1.0: unable to enumerate USB device on port 1 [ 2018.000128] usb 2-1: new full speed USB device using uhci_hcd and address 3 And ubuntu 10.10 recognizes that scanner. So: What can i do to see my usb stick? BTW: on my other Thinkpad running fedora 14 it works perfectly... Cheers -Peter

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  • How do I maximize and check my gigabit transfer rate?

    - by J Penguin
    I'm trying to maximize my LAN transfer speed. LAN cards and switch are all gigabit on a CAT 6 cable. Modes are set correctly to 1000 full duplex. CentOS server Testing with ftp from both windows and fedora, I'm only having the speed around 11MB/s. On windows I notice that the first few seconds of file transfer I'm actually getting around 25MB/s before it drops to 11MB/s Can anyone please recommend me what my next step should be to increase this performance? Are there any utilities I can use to test the file transfer speed without taking hard drive speed into consideration? The only thing I know is the MTU which I will have to wait until the office hour is over before I can play with it. If there are anything else I should be aware of, please please let me know. Thank you!

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  • I get a "could not create lock file" error when trying to run Postgres

    - by zermy
    I recently had to replace my postgresql.conf file, and I thought I got the settings right, but when I try to run Postgresql, I get this error: ESTFATAL: could not create lock file "/var/run/postgresql/.s.PGSQL.5432.lock": No such file or directory My workaround is to go as root and create a folder called postgresql in /var/run and then change the owner of the folder to postgres. The biggest problem is that I need to do this every single time my computer starts, the folder somehow deletes itself. I tried commenting out the external pid file bit in the conf file, but that didn't change anything.

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  • solr administration

    - by devrick0
    Does anyone have any notes for an sysadmin supporting solr? I'm looking for anything that might be useful for monitoring & metrics as well as troubleshooting. Some useful links I have found are: /solr/admin/stats.jsp and /solr/admin/analysis.jsp In the logs I have noticed, other than the query, "hits", "status" and "QTime" values. The documentation on what these mean is sparse at least based on the 100+ websites I have checked. QTime appears to be the query time response in milliseconds. Hits is some form of results but I'm not sure exactly what makes that up and I'm not sure about status. Typically I see status come back as "0" but I have seen other numbers such as "5", so my thoughts that it could be either HTTP status codes or a 0 or 1 (good or bad) methodology isn't accurate. All of the documentation I have come across is intended for developers. Any sysadmin-centric documentation would be a big help.

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  • Trouble installing ubuntu server on virtualbox (osx)

    - by audio.zoom
    Hello all, I'm trying to install lucid lynx 10.04.2 server on a virtualbox on snow leopard. I have 2 server iso files freshly downloaded one i386 and one 64bit. When I try to start the virtual machine with either one set to be the cd drive I'm getting the same error: Failed to open a session for the virtual machine Ub. Failed to load VMMR0.r0 (VERR_SUPLIB_OWNER_NOT_ROOT). Unknown error creating VM (VERR_SUPLIB_OWNER_NOT_ROOT). Couldn't find anything on it on google so I'm trying to see if anyone else has dealt with this issue. Thanks much in advance! edit: just downloaded the 32bit desktop edition to same avail edit2: ran Disk Utility' replair permissions then restarted. New error VERR_SUPLIB_WORLD_WRITABLE (instead of VERR_SUPLIB_OWNER_NOT_ROOT)

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  • High RAM usage, not seen in task manager

    - by r4dk0
    Hi! I am using Windows 7 64-bit 7600, with 4Gb of RAM. I have a serious problem, since something uses a lot of RAM(3.94Gb) and I see "stairs" in taskmanager, it rises to +3Gb RAM and it drops to about 2Gb and then rises slowly again, and suddenly drops. I tryed installing this version again and other versions, newer ones, but no effect. Ive even tryed disconnecting other harddrives while I installed it, and then installed NOD32 and updated it. How could I know what is using that much RAM? P.S.: I was suspecting superfetch service, I disabled it, restarted pc, and it didnt work, since the memory is the highest point when I login with password, it is really annoying since I need about 1minute to see my desktop, neither alone try anything else. After loging in it slowly drops and after random time it starts rising again. That doesnt happen immediately after a fresh windows install. And how the drivers go, I tryed older drivers for GPU, and newest ones.

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  • High RAM usage, not seen in task manager

    - by r4dk0
    Hi! I am using Windows 7 64-bit 7600, with 4Gb of RAM. I have a serious problem, since something uses a lot of RAM(3.94Gb) and I see "stairs" in taskmanager, it rises to +3Gb RAM and it drops to about 2Gb and then rises slowly again, and suddenly drops. I tryed installing this version again and other versions, newer ones, but no effect. Ive even tryed disconnecting other harddrives while I installed it, and then installed NOD32 and updated it. How could I know what is using that much RAM? P.S.: I was suspecting superfetch service, I disabled it, restarted pc, and it didnt work, since the memory is the highest point when I login with password, it is really annoying since I need about 1minute to see my desktop, neither alone try anything else. After loging in it slowly drops and after random time it starts rising again. That doesnt happen immediately after a fresh windows install. And how the drivers go, I tryed older drivers for GPU, and newest ones.

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  • Windows 7 won't read from NAS on LAN

    - by Alfy
    I've got a Linkstation NAS drive on a local network. Having just got a new laptop with Windows 7 Home Professional, I can no longer read anything of the drive. I've tried accessing the drive using \192.168.1.55\share, using ftp programs such as WinSCP, filezilla and even using firefox to hit ftp://192.168.1.55. The really annoying thing is that through these methods I can see the files on the drive, counting out any kind of connection issues. I can navigate through the NAS file system, but as soon as I try and copy a file off the NAS, things just stop working. Accessing the drive through a Windows XP machine works fine. So far I've tried: Disabling firewalls Adding the LmCompatibilityLevel key to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa Using the 40 - 56 bit encryption instead of the 128 bit. Has anyone got any suggestions of what I can check or try? This is driving me crazy and I'm totally out of ideas?

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  • How do you remove old Windows Vista Backups?

    - by leeand00
    I've been backing up my Vista box using Complete PC backup for quite a while now, and I was just wondering how it is that you remove old backups when your backup drive is to full for another backup. I recently received the following error: The backup did not complete successfully. An error occurred. The following information might help you resolve the error: There is not enough space to save the backup files. Free up disk space or change your backup settings. (0x81000005) I don't see anything in the settings for the backup to change this. Do I have to mount the backup to delete an old backup? If so where is that file located?

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  • NRPE and the $USER1$ variable

    - by timbrigham
    I have NRPE daemons running on all of my remote Linux boxes. I have a couple configurations in place and I'm trying to standardize the paths in my nrpe.cfg. The changes are deployed via Puppet. I would like to use the following syntax: command[mycommand]=$USER1$/check_tcp .. etc. The $USER1$ variable is not available in my NRPE setup. I could write Puppet templates for all the variants but I would much prefer to manage this through a native method. Is there anything available to do so? If not does anyone have a sample Puppet config that will address this?

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  • screensavergraceperiod not working

    - by Ralf
    Good Morning, in windows XP there is a registry setting called ScreenSaverGracePeriod which lets you set a time period between the activation of the screensaver and locking of the screen. As as result, as soon as you see the screensaver beeing activated, you have X seconds to press a key or move the mouse in order to avoid having to log in again. Unfortunately, this setting isn't working on my machine. I tried everything I could find on the net (setting the period as stirng or number), but it still does not work. Could it be that some kind of security suite (Symantec) or anything else is blocking this feature? Cheers, Ralf

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  • Varnish Running VCC-compiler failed on purge

    - by FLX
    I've been following this guide which uses this default.vcl. However, when starting Varnish I get the following error: * Starting HTTP accelerator [fail] storage_malloc: max size 1024 MB. Message from VCC-compiler: Expected '(' got ';' (program line 341), at (input Line 43 Pos 22) purge; ---------------------# Running VCC-compiler failed, exit 1 VCL compilation failed Which means that there is something wrong with purge here: sub vcl_hit { if (req.request == "PURGE") { purge; error 200 "Purged."; } } I don't see anything wrong, can someone explain? Thanks!

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  • Socksify TCP connections reaching a gateway IP -- preferably without iptables

    - by Alexandra Neagu
    I have Virtualbox installed on Debian with a few virtual machines. I can't install anything in the guests, and I use host only networking, vboxnet0. The host IP in the host network is 192.168.56.1, and the guests have static IPs in 192.168.56.0/24. I access Internet with a SOCKS proxy (without authentication) and I would like the Virtualbox guests TCP connections to be sent through the SOCKS proxy. This would also be useful for socksifying external TCP reaching a gateway network card or wireless access point. I looked at transocks, tun2socks, with dante-client, etc., but I don't know how can I achieve this without enabling IP forwarding in the host and using iptables. Maybe to attach somehow the Virtualbox vboxnet0 network to the tunnel tun0 used by tun2socks? Or maybe there is a way to do NAT to tun0 in Virtualbox? I only need TCP traffic and I don't need UDP, not even for DNS.

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  • Google Chrome Enterprise - Any Gotchas?

    - by AJ
    Has anyone rolled out Google Chrome to a medium / large organisation? I would like to suggest it to our management (because I think it would work very nicely with some of our intranet applications), and I would like to find out what problems (if any) the rest of the world has been experiencing with it. Have you found any problems? I'm thinking of enterprise-level problems. I'm thinking that we can solve anything that requires a specific configuration / proxy setting / etc. I don't really know what I think might be a problem, but I wonder if there are any usability problems that occur when non-geeks use it? Or problems which only rear their ugly heads when you've got 50 users all doing something unexpected. Any helpful information or suggestions would be appreciated. Thanks. UPDATED: We tend to use Microsoft stuff, so Sharepoint, IIS, SQL Server, are typical building blocks of internal sites. (Thanks, @Jim, for reminding me to mention that).

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  • Recovering drivers from previous installation?

    - by Walkerneo
    Yesterday I bought a new computer and I've been setting it up since this morning. The hard drive came with windows 7 home premium (x64) installed, but I decided to instead install windows 7 ultimate (x64) - this is what I'm currently using. Unfortunately, there were some drivers that were installed that I need in this installation. I only notice because the computer doesn't have the ethernet drivers, so I'm only able to connect to the internet via wireless. There are other drivers missing as well, but I'm not yet seeing the effects. I still have the Windows.old folder with the previous installation, which has the drivers. Is there any way to copy the necessary ones over? I tried the options for updating driver software through device manager with the path set to System32\drivers of the old installation, but it didn't find anything.

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  • Misunderstanding Scope in JavaScript?

    - by Jeff
    I've seen a few other developers talk about binding scope in JavaScript but it has always seemed to me like this is an inaccurate phrase. The Function.prototype.call and Function.prototype.apply don't pass scope around between two methods; they change the caller of the function - two very different things. For example: function outer() { var item = { foo: 'foo' }; var bar = 'bar'; inner.apply(item, null); } function inner() { console.log(this.foo); //foo console.log(bar); //ReferenceError: bar is not defined } If the scope of outer was really passed into inner, I would expect that inner would be able to access bar, but it can't. bar was in scope in outer and it is out of scope in inner. Hence, the scope wasn't passed. Even the Mozilla docs don't mention anything about passing scope: Calls a function with a given this value and arguments provided as an array. Am I misunderstanding scope or specifically scope as it applies to JavaScript? Or is it these other developers that are misunderstanding it?

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  • how to i lock a Harddrive to a certain drive letter

    - by Memor-X
    i have an external hard drive that i have set to Drive F which on it contains some programs that i have shortcuts on the desktop how i have a second external hard drive which i store my music on which is auto assigned to Drive E, due to someone thinking that Australians love to have f** wings on power plugs for hard drives while power boards have each socket close together i can have both of these hard drives set at the same time my music hard drive i normally only plug up when i sync music to my ipod but on occasion when i unplug my music hard drive and plug my old one back in or at times when i turn on my computer with the music hard drive in, turn off my computer and turn it back on with my old hard drive it's drive letter gets switched to E i get annoyed having to always go into disk management and change the drive letter back to F when this happens so i am wondering if I can lock my hard drive to always be F, if anything else tries to be F it can fail for all i care If there is a batch file i can use that'll go though all the steps of Disk Management to change a drive's letter, that way i can set it up in the startup folder

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  • Strange messages on new Dell Workstation during bootup

    - by dan99t
    I recently installed Windows 7 Ultimate on a new Dell T-7500 Workstation, and am seeing some strange messages on the screen: Dell SAS 6 Host Bus Adapter BIOS MPTBIOS 6.22.03.00 ( 2008.08.06 ) Initializing….. Press Ctrl – C to run SAS Configuration Utility Searching for Devices at HBA 0….. Dell MPT Boot ROM Successfully installed Then it loads Windows 7. All of above happens on its own, I don't touch anything. So what is going on & what do I have to do get rid off those initializing commands ? I have never had this happen to any previously owned Dell systems. Also I haven't installed any drivers yet but Sound, Video & Internet does work. Do I need to install any additional drivers?

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  • Cookies blocked by router?

    - by Martin wiboe
    Hello, My friend has a D-Link DI-524 router that she uses for her home broadband. It's a pretty vanilla setup with the standard firewall settings, DHCP enabled etc. However, recently she has experienced something strange - cookies are not working on every computer on her LAN, whether using FF3.5 or IE8. I tried viewing the HTTP traffic using Fiddler2, and the requests come through fine (mind you, Internet browsing still works flawlessly) but whenever a website tries to set a cookie using the "Set-Cookie:" header, my computer sees that line as "Set-*ookie:" with the cookie contents removed. I have never seen anything like this - do you have any idea? Regards, Martin

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  • Upgrade MySQL on Plesk on Windows

    - by Cyril Gupta
    I just got a nasty surprise when I installed a website in Unicode Hindi (Indian language) on a server, all freshly entered unicode data is turning into question marks on the server. On my dev machine it works perfectly. I found that I have MySQL version 5.0.45 (installed in default by Plesk I guess). On my dev machine i have version 5.1.33. I believe the problem could be due to the version difference. The new version of MySQL apparently has better support for Unicode than the older one. I want to upgrade MySQL on my Windows Server machine with Plesk installed on it I am reluctant to just install the new version using the mysql installer because Plesk maintains some custom settings for mysql and I am afraid the new version could change those settings and break my db. Can anyone tell me do I have to do anything special to install MySQL on plesk on windows or can I just use the new version installer?

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  • Converting 2D coordinates from multiple viewpoints into 3D coordinates

    - by Kirk Smith
    Here's the situation. I've got a set of 2D coordinates that specify a point on an image. These 2D coordinates relate to an event that happened in a 3D space (video game). I have 5 images with the same event point on it, so I have 5 sets of 2D coordinates for a single 3D coordinate. I've tried everything I can think to translate these 2D coordinates into 3D coordinates, but the math just escapes me. I have a good estimate of the coordinates from which each image was taken, they're not perfect but they're close. I tried simplifying this and opening up Cinema 4D, a 3D modeling application. I placed 5 cameras at the coordinates where the pictures were taken and lined up the pictures with the event points for each one and tried to find a link, but nothing was forthcoming. I know it's a math question, but like I said, I just can't get it. I took physics in high school 6 years ago, but we didn't deal with a whole lot of this sort of thing. Any help will be very much appreciated, I've been thinking on it for quite a while and I just can't come up with anything.

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