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• Information I need to know as a Java Developer [on hold]

  - by Woy

  I'm a java developer. I'm trying to get more knowledge to become a better programmer. I've listed a number of technologies to learn. Instead of what I've listed, what technologies would you suggest to learn as well for a Junior Java Developer? I realize, there's a lot of things to study. Java: - how a garbage collector works - resource management - network programming - TCP/IP HTTP - transactions, - consistency: interfaces, classes collections, hash codes, algorithms, comp. complexity concurrent programming: synchronizing, semafores steam management metability: thread-safety byte code manipulations, reflections, Aspect-Oriented Programming as base to understand frameworks such as Spring etc. Web stack: servlets, filters, socket programming Libraries: JDK, GWT, Apache Commons, Joda-Time, Dependency Injections: Spring, Nano Tools: IDE: very good knowledge - debugger - profiler - web analyzers: Wireshark, firebugs - unit testing SQL/Databases: Basics SELECTing columns from a table Aggregates Part 1: COUNT, SUM, MAX/MIN Aggregates Part 2: DISTINCT, GROUP BY, HAVING + Intermediate JOINs, ANSI-89 and ANSI-92 syntax + UNION vs UNION ALL x NULL handling: COALESCE & Native NULL handling Subqueries: IN, EXISTS, and inline views Subqueries: Correlated ITH syntax: Subquery Factoring/CTE Views Advanced Topics Functions, Stored Procedures, Packages Pivoting data: CASE & PIVOT syntax Hierarchical Queries Cursors: Implicit and Explicit Triggers Dynamic SQL Materialized Views Query Optimization: Indexes Query Optimization: Explain Plans Query Optimization: Profiling Data Modelling: Normal Forms, 1 through 3 Data Modelling: Primary & Foreign Keys Data Modelling: Table Constraints Data Modelling: Link/Corrollary Tables Full Text Searching XML Isolation Levels Entity Relationship Diagrams (ERDs), Logical and Physical Transactions: COMMIT, ROLLBACK, Error Handling

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• 2 Nics - Same Subnet..Route backup traffic through one of them

  - by Matthewhall58

  I have a windows server and a centos linux server. I want the nightly backup file (targz) that copies to the windows machine to use a different nic so that the main nic is not burdenend with moving the large file. Each server has 2 Nics in it. the network is 10.173.10.0 mask 255.255.255.192 Centos Linux Box: Eth0 is configured with 10.173.10.80 mask 255.255.255.192 gw 10.173.10.65 Eth 1 is configured with 10.173.10.71 mask 255.255.255.192 gw 10.173.10.65 Windows Box Eth 0 is 10.173.10.72 mask 255.255.255.192 gw 10.173.10.65 Eth 1 is 10.173.10.70 mask 255.255.255.192 gw 10.173.10.65 I can ping each machine from each machine. On the linux machine I use the command route add -host 10.173.10.70 dev eth1 but then when i ping 10.173.10.70 it is unreachable..... WHY?

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• Is there any way to enable remote desktop with a password without setting a password on the os?

  - by Coder

  I'm running Windows 7 and would like to use remote desktop to connect to my home computer. As such i want to enable password security for remote desktop, but I do not want to have to enter a password to log into my computer if i'm physically at my computer. Is there any way to do this? I am an administrator user and I want to have the same icons and configuration regardless of if i log in remotely or locally but i want only the remote connection to require a password. I read about being able to do something similar by adding another user account, but is there any way to do it so that the same icons and settings take affect regardless of how i log in? Thanks.

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• Reasonably Secure Alternative to Poptop PPTP Server for Ubuntu server and Windows clients?

  - by wag2639

  I have a poptp server running on a old Fedora server but I'm upgrading to an Ubuntu 10.04 server. I was wondering if there are any good, reasonable secure alternatives to poptop that in can install on our new Ubuntu server as a way to get VPN access from Windows clients (XP and 7) to get remote access into our Intranet. We only use the VPN to access files located inside the network; we do not need to use it as a proxy/gateway. I've looked into openVPN but it seemed way too complicated and I would prefer something built into Windows. A Windows 7 only solution is OK.

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• insert, delete etc. keys not working on Cherry Strait keyboard

  - by Brabster

  Hey folks, I got a Cherry Strait USB wired keyboard for xmas and I've been unable to get several keys working under Ubuntu 10.10 or Win XP. There are a few keys. including the Print Screen key, insert, end, delete, pg up, pg down and home. I've not been able to identify any others that aren't working. I'm not sure as to the best approach to determine what's wrong. Is there any way to confirm whether there is any output from the keyboard in response to pressing those keys, ideally in Ubuntu as that's where I spend most of my time so that I know if it's a fault with the device itself? (I've tried different USB ports and also hitting those keys whilst in the Keyboard Shortcuts app, no response to these keys)

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• My HP ProBook 4520s running Windows 7 hangs intermittently

  - by Rory Alsop

  I have not been able to trace a consistent cause, but a few times a day my laptop will hang for up to about a minute. I can still move the cursor which displays as the wait icon for whatever application I was last in, but cannot carry out any other actions. Unfortunately I can't Ctrl+Alt+Del to bring up a task manager and I just have to wait. I can't pin it down to a particular application either, but generally I have either office apps, a browser or other tools open. I'm tempted to think it may be network timeout on something, as I can't think of anything else which would delay for that long with such a significant impact, but as I'm more a Unix person I thought it would be worth asking here.

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• How to configure a static wildcard subdomain with dnsmasq.

  - by Prody

  I have a network behind a NAT with a few machines. The machines are: router - NAT, dnsmasq, forwarding - directly connected to the inet server - which runs ssh, www and some other stuff clients - which do stuff on server I also have mydomain.com. server.mydomain.com is pointing to my connection's IP (single IP), which is the router, which forwards ports to server. Server, has a httpd running, which serves different sites based on vhosts. So I have site1.server.mydomain.com, site2.. The problem is that all the traffic is going thru the router, and when I check logs I always see the router's IP for everything (so it's hard to see who is running the script with the while(1)). I would just ServerAlias site1.server.local, but most of the sites have a root URL saved somewhere on top of which other URLs are built, so I can't do that. The solution for me would be telling dnsmasq somehow to answer to *.mydomain.com with server's IP. Is this possible somehow?

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• Configure browser and VPN traffic

  - by Zachzor

  Hello everyone. I've been having a few issues with my company's VPN server. The VPN is running on a Mac Server (10.6.x) and I'm also using a Macbook (10.6.5). I've been building specific programs to gather information from IPs, and to work on this while I'm at home I need to go through our VPN to access the network. Unless I send all traffic over VPN, I'm not able to hit those specific IPs. However, I'm unable to access the internet through my web browser when I send all my traffic over VPN. I was wondering if there was a way (besides setting up a split tunnel) that I could set up a web browser to go through my current wireless connection, as opposed to going through the VPN like the rest of my applications. Wether the browser be Chrome, Firefox, or Safari doesn't matter to me. Anyone else run into this issue and find a clever way to solve it? Thank you!

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• Internet sharing over LAN on Windows Server 2012

  - by USER

  I have a DSL modem connected to a server (ON NIC1) running Windows Server 2012 and 7 computers (running Windows 7 32-Bit) connected to a server though a network switch (ON NIC2). I shared the internet connection from the server through DHCP so I am able to access the internet from those 7 computers, but I am unable to: Access Google.com Activate Windows Update Windows An error is arising that says UNABLE TO ACTIVATE WINDOWS Activation Error Code: 0x80072EE2 Firewall and Anti-Virus are off on both the Server and the Clients. Is there is any additional setting that I want to do?

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• State Changes in a Component Based Architecture [closed]

  - by Maxem

  I'm currently working on a game and using the naive component based architecture thingie (Entities are a bag of components, entity.Update() calls Update on each updateable component), while the addition of new features is really simple, it makes a few things really difficult: a) multithreading / currency b) networking c) unit testing. Multithreading / Concurrency is difficult because I basically have to do poor mans concurrency (running the entity updates in separate threads while locking only stuff that crashes (like lists) and ignoring the staleness of read state (some states are already updated, others aren't)) Networking: There are no explicit state changes that I could efficiently push over the net. Unit testing: All updates may or may not conflict, so automated testing is at least awkward. I was thinking about these issues a bit and would like your input on these changes / idea: Switch from the naive cba to a cba with sub systems that work on lists of components Make all state changes explicit Combine 1 and 2 :p Example world update: statePostProcessing.Wait() // ensure that post processing has finished Apply(postProcessedState) state = new StateBag() Concurrently( () => LifeCycleSubSystem.Update(state), // populates the state bag () => MovementSubSystem.Update(state), // populates the state bag .... }) statePostProcessing = Future(() => PostProcess(state)) statePostProcessing.Start() // Tick is finished, the post processing happens in the background So basically the changes are (consistently) based on the data for the last tick; the post processing can a) generate network packages and b) fix conflicts / remove useless changes (example: entity has been destroyed - ignore movement etc.). EDIT: To clarify the granularity of the state changes: If I save these post processed state bags and apply them to an empty world, I see exactly what has happened in the game these state bags originated from - "Free" replay capability. EDIT2: I guess I should have used the term Event instead of State Change and point out that I kind of want to use the Event Sourcing pattern

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• Mostly offsite asset management (laptops/smartphones) - what is a good SaaS based solution?

  - by Jack T

  Most of our company assets are offsite. Everyone either works at home or onsite at a customer. Most asset management/audit/remote control software concentrate on company LAN based assets. We don't need an NMS as we use OpenNMS in the internal network. I was thinking of something like Altiris Client Management Suite but since everything is connected to the internet a SaaS based solution sounds like the ways to go. LogMeIn Central looks ok but not that comprehensive. What do you guys use?

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• Force snmptrapd to log only v2c traps

  - by dare2be

  Hello, I am in the middle of writing new network management software for my University. However, I need to implement a quickie solution to handle specific traps. Right now, my snmptrapd is configured to accept any traps, i.e.: # /etc/snmp/snmptrapd.conf authCommunity log publicString logOption f /var/log/snmptrapd.log format1 "" format2 "%02.2h:%02.2j %b %N\n" What I basically want to do is to log ONLY v2c traps. I intended to do it with setting the format for v1 traps to null (format 1 "") but snmptrapd keeps sending "" to its log. Does anybody know a workaround for this?

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• Script to run chown on all folders and setting the owner as the folder name minus the trailing /

  - by Shikoki

  Some numpty ran chown -R username. in the /home folder on our webserver thinking he was in the desired folder. Needless to say the server is throwing a lot of wobbelys. We have over 200 websites and I don't want to chown them all individually so I'm trying to make a script that will change the owner of all the folders to the folder name, without the trailing /. This is all I have so far, once I can remove the / it will be fine, but I'd also like to check if the file contains a . in it, and if it doesn't then run the command, otherwise go to the next one. #!/bin/bash for f in * do test=$f; #manipluate the test variable chown -R $test $f done Any help would be great! Thanks in advance!

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• How to Extending a logical volume in WMWare

  - by Mercer

  down vote favorite i have a CentOS 6.3 into my Virtual Machine. I have 2 Disk: Disk#1 = 18G Disk#2 = 20G [root@vm ~]# df -h Filesystem Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_system-lv_root 1008M 250M 708M 27% / tmpfs 1.9G 0 1.9G 0% /dev/shm /dev/sda1 194M 31M 154M 17% /boot /dev/mapper/vg_system-lv_home 504M 17M 462M 4% /home /dev/mapper/vg_system-lv_opt 2.0G 68M 1.9G 4% /opt /dev/mapper/vg_produits-lv_grid 6.9G 2.5G 4.1G 38% /opt/grid /dev/mapper/vg_produits-lv_oracle 6.9G 144M 6.4G 3% /opt/oracle /dev/mapper/vg_system-lv_tmp 2.8G 71M 2.6G 3% /tmp /dev/mapper/vg_system-lv_usr 2.5G 1.6G 799M 67% /usr /dev/mapper/vg_system-lv_var 2.0G 278M 1.6G 15% /var So i want to extend my /tmp and my /opt/oracle like this: 10Go in/tmp 13Go in /opt/oracle Thx.

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• ssh rsa keys expires after 5 years

  - by Kreker

  I'm using an old login with ssh-rsa public/private key and all was good. I noticed that a couple of days ago the authorizazion was avoid with message "server refused our keys". After diggin' I figured out that the couple of keys stop working after exactly 5 years of their creation. So I make a new pair of keys, take the public one, paste inside a file in ~/.ssh of the username that I'm using, converted it with ssh-keygen -if and paste the new file into authorized_keys but the I still get "server refused our key". It's ok to copy and paste the real key without transfer it? What I'm missing? This isn't my first time using a pair of keys and I follow the same procedure as described. I'm in doubt if I'm changing the correct authorized_keys file but I've take a look in /etc/passwd and see where is the home of the login which I'm using.

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• htacces rewrite condition old site to new site with querystring

  - by Brandon Braner

  I am not even going to pretend to fully understand how htaccess rewrite conidtions work. Ive been working on this for a while searching and searching. I have an old wordpress site www.old-site.com and a new site www.site.com wordpress uses query strings page_id=# to redirect to pages on the old site page_id=2 went to a specific page but on the new site it goes the the home page i need old-site/?page_id=2 to go to site.com/our-company here is what i am trying RewriteCond %{HTTP_HOST} ^(www.)?old-site.com$ [NC] RewriteCond %{QUERY_STRING} ^page_id=2$ RewriteRule ^(.*)$ http://www.site.com/our-company/ [R=301,L] if i take out the rewrite conditio for query string it redirects all traffic from old-site.com to the our company page on the new site. where am i going wrong? i have about 15 redirects i need to do this way. thanks in advance

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• Cannot send email from EC2 instance on port 587

  - by Tahsin Mostafiz

  I have written a mail service for our flask application that uses Celery and RabbitMQ to send emails (using gmail). I have got the celery consumer and producer communicating okay but I cannot get to send send emails. I am getting a socket.error: [Errno 101] Network is unreachable. I think this means that AWS is blocking port 587 - even though in my security group I opened both ports 587 and 25 (inbound and outbound). Any reason why this is happening? Any help will be highly appreciated.

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• Parallels: How to see a Mac-hosted website from Windows?

  - by Jim Miller

  I'm traveling at the moment, and have moved one of the websites I'm working on to my MBP so I can work on it without a network connection. I've made an addition to the Mac's /etc/hosts file pointing the domain name to 127.0.0.1, and all's well. I now want to get into Parallels and check the site from Windows browsers. How do I get things so that the Windows browser will understand the domain name and access the site? The Windows image obviously doesn't recognize / can't find the Mac's /etc/hosts file, and references to 127.0.0.1 in the Windows hosts file just as obviously point to Windows, not the Mac. Any advice out there? Thanks!

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• Problem connecting with RDP between Mac and Win2k3 server

  - by salle55

  I have an iMac running Mac OS X 10.5.8 and the RDP Connection Client 2.0.1. http://salle.dyndns.org/misc/rdp%5Fproblem1.png When I try to connect to a Windows 2003 Server on the same network I get a dialog saying "Remote Desktop Connection cannot verify the identity of the computer that you want to connect to". Picture: salle.dyndns.org/misc/rdp_problem2.png And when I press the Connect-button in the previous dialog I get the same message in another dialog: Picture: salle.dyndns.org/misc/rdp_problem3.png I can connect to the Win2k3 server from a Vista machine, and it used to work from the Mac as well. I stopped working from the Mac after I did some configuration on the win2k3 server, removed and added the the connection in the Terminal Services Configuration: Picture: salle.dyndns.org/misc/rdp_problem4.png What do I need to do to be able to connect from the Mac again? (I have not enough reputation to post multiple links or images)

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• How to register a new domain name on a windows based domain controller?

  - by JL

  Is there an easy and quick way I can create a new subdomain on a windows based domain controller. My primary domain controller is also my primary DNS server on my network. I want to create a subdomain and have its ip directed to that of my IIS server. Thanks in advance... Sorry if my terminology is somewhat lacking... My domain is companyName.com What I want to do is create auditingResults.companyName.com... and have it route to 192.168.1.3 for example..... where on 1.3 I will have an IIS server presetup. Please feel free to leave comments to correct my terminology if required....

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• How can I have a Windows 7 VMware guest without mouse support?

  - by Matthew Read

  Despite having vmmouse.present = "FALSE" mouse.vusb.absDisabled = "TRUE" pref.motionUngrab = "FALSE" in my .vmx file and a customized VMware Tools installation on the guest that does not include the mouse driver, I somehow have fully integrated mouse support for my Windows 7 VM. I can smoothly mouse from the host into the guest without needing to click or Ctrl+G in and Ctrl+Alt out. I don't want this because of the issues it causes with games. How can I get the VM to have no special mouse support while still having VMware Tools installed for its other functions (network, graphics, etc.)? The mouse works as I want without VMware Tools but not otherwise — again, despite not installing the mouse driver and having all those settings trying to disable it. Device Manager shows that the generic Windows PS/2 mouse driver is being used and not the virtual mouse driver. Guest and host are both Windows 7 Ultimate SP1, x86 and x64 respectively. I'm using VMware Player 3.1.4 and the VMware Tools installed is the latest, 8.4.6.16648.

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• Can't get port forwarding to work on Ubuntu

  - by Znarkus

  I'm using my home server as NAT/router, which works well. But now I'm trying to forward port 3478, which I can't get to work. eth0 = public interface eth1 = private network $ cat /proc/sys/net/ipv4/conf/eth0/forwarding 1 $ cat /proc/sys/net/ipv4/conf/eth1/forwarding 1 Then to forward port 3478 to 10.0.0.7, I read somewhere that I should run iptables -t nat -A PREROUTING -p tcp -i eth0 --dport 3478 -j DNAT --to-destination 10.0.0.7:3478 iptables -A FORWARD -p tcp -d 10.0.0.7 --dport 3478 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT I also ran ufw allow 3478 But testing port 3478 with http://www.canyouseeme.org/ doesn't work. Any idea what I have done wrong?

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• Windows clients cannot access machine running DHCP server

  - by science9712

  I'm trying to setup a small LAN, using an Ethernet switch, an Arch Linux server, and around 10 Windows XP machines. This network has no outside connections. The Arch machine has a self configured ip address (configured with ip addr add 192.168.0.1 dev eth0), and acts as a DHCP server(using dhcpd). This portion works great, windows clients get IP addresses, the correct gateway settings, perfect. However, the clients cannot connect to each other, or to the dhcp server. When I run ping 192.168.0.1 on any client, I get no response, same happens if I try to ping any other client. On the gateway machine, I can't ping any of the clients either. Any help would be much appreciated!

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• Windows File Checksums - Is my system hacked?

  - by rism

  I would like to know if there is a utility to verify the checksums of every windows file on my Win 7 Ultimate system. It seems on the surface such an obvious utility but I dont ever remember seeing one? I had a very weird experience while surfing earlier today and now Im not entirely sure my system is secure. I have a collection of tools in the WSCC suite but these tools no doubt just make system calls to the win32 api and if that has been subverted then the tools are practically useless. How do I know my Win 7 files are actually Win 7 files? I am particularly interested in verifying the integrity of all network TCP/IP files.

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• My Laptop (HP/Compaq 2510p) running ubuntu 10.04 LTS keeps losing the WLAN connection.

  - by Ernelli

  I am using Wicd and can successfully connect to my ADSL router (Thomson TG 787) using WPA PSK. But with regular interval I lose the ability to connect to Internet. I can ping the GW and can actually ping servers on the Internet but not connect to them using HTTP (Tested with both Firefox and wget). I would suspect the router unless for the fact that the problem does not show up when running Windows XP on the same computer and also, when the problem arises, a simple disconnect/connect in Wicd solves the problem, which does not involve the router (Except for the DHCP request). I have searched Ubuntu forums without luck, most problems described relate to specific network drivers or other problems. Does anyone have the same experience with Linux/Ubuntu and WLAN?

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