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  • The idea of functionN in Scala / Functionaljava

    - by Luke Murphy
    From brain driven development It turns out, that every Function you’ll ever define in Scala, will become an instance of an Implementation which will feature a certain Function Trait. There is a whole bunch of that Function Traits, ranging from Function1 up to Function22. Since Functions are Objects in Scala and Scala is a statically typed language, it has to provide an appropriate type for every Function which comes with a different number of arguments. If you define a Function with two arguments, the compiler picks Function2 as the underlying type. Also, from Michael Froh's blog You need to make FunctionN classes for each number of parameters that you want? Yes, but you define the classes once and then you use them forever, or ideally they're already defined in a library (e.g. Functional Java defines classes F, F2, ..., F8, and the Scala standard library defines classes Function1, ..., Function22) So we have a list of function traits (Scala), and a list of interfaces (Functional-java) to enable us to have first class funtions. I am trying to understand exactly why this is the case. I know, in Java for example, when I write a method say, public int add(int a, int b){ return a + b; } That I cannot go ahead and write add(3,4,5); ( error would be something like : method add cannot be applied to give types ) We simply have to define an interface/trait for functions with different parameters, because of static typing?

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  • WiFi slow sometimes, reboot helps, how do I debug it?

    - by January
    Ubuntu 12.04.1 with all updates installed. Laptop Lenovo Thinkpad X230 with Intel Corporation Centrino Advanced-N 6205. WiFi sometimes becomes extremely slow. Often this occurs when I wake the system from suspend and connect to a different network. I find no obvious clues in system logs. /etc/init.d/network-manager restart doesn't help, but a reboot does. How can I go on with debugging this issue? In specific, which parts of the system should I try to restart (without a complete reboot)? I know of problems with Intel WiFi (see for example this question and the instructions here), but if that was the problem, I would expect the WiFi to be slow at all times, and not just sometimes. Also, I have a gut feeling that it might be a DNS issue (for example, getting a page from a known server is faster than accessing a new server), but I don't know how to tackle it. Update: despite numerous updates in the meanwhile, I still observe this behavior. It happens always when I access my WiFi router at home after returning from work; when I reboot my laptop, the connection speed is good again.

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  • Can't connect to or search Wi-Fi

    - by Mark
    I just installed the latest version of Ubuntu; I think it was 13 or something. Anyway, I got it running, and now I've been trying to connect to my Wi-Fi AP. No matter where I go I don't see an option for Wi-Fi. I looked on the computer and found some commands to use in a terminal to run a scan for Wi-Fi networks, but all of them returned the error: interface doesn't support scanning What are step-by-step directions to make this work?

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  • no wifi after grub 2 crash

    - by Omu
    on ubuntu 10.10 I used StartupManager to set windows 7 as the default boot, also chosen the 1024x768 resolution, 16 bit, time: 3sec, and checked "show splash screen". after the restart there was no GRUB menu at all, windows 7 booted, and in windows the clock was 0:03 instead of 10:03, also the wifi doesn't sees any connections anymore I reinstalled ubuntu 10.10 so the GRUB menu is back, changed the clock back from BIOS, but my wifi doesn't sees any connections in windows nor in ubuntu (I write this from another computer)

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  • networkprinting with cups in ubuntu 13.10

    - by gero
    I upgraded from Ubuntu 13.04 to Ubuntu 13.10. The printer configurations were transferred correctly. I have an USB laser printer, which still works if I connect my laptop directly. Usually I used this printer by wlan or bluetooth, where an old laptop works as server (cups 1.3.X). If I now want to print some pdf or postscript file, one or the other way I only obtain a header printed, not the content of the file. Curiously the Ubuntu 13.10 test page is printed correctly.

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  • Putting Ubuntu Server on to a networked HDD

    - by SimplySimon
    Firstly, I know very little about servers and secondly the 1Tb HDD I have has network capabilities, but no software is installed on it, so when connected to the computer it is seen as a network connection, but not as a drive. Any advice on how to get started would be great. Up until now, I have been using it as a USB drive which worked well, but when this is sorted, I would like it to be connected directly to our BT HomeHub accessible through the WiFi for all the family to use as a film and back up repository. I would then be able to set up individual accounts for each family member to use and may be, if possible, make it accessible from outside locations. The First question then is: How can I install Ubuntu server on the 1Tb HDD attached directly to the computers network port but which doesn't show up in Nautilus? HDD Western Digital 1.0Tb LBA 1953525168 Model: WD10EACS-00DB0 DCM: DHRNHT2CF

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  • Finding the best practice for a game simulating tool

    - by Tougheart
    I'm studying Java right now, and I'm thinking of this tool as my practice project. The game is "League of Legends" in case anyone knows it, I'm not actually simulating the game as in simulating game play, I'm just trying to create a tool that can compare different champions to each other based on their own abilities and items bought inside the game. The game basics are: Every player has a champion in a team of 5 players playing against another team. Each champion has a different set of abilities (usually 4) that s/he uses to do damage to opposing champions. Each champion gets stronger by buying different items, increasing the attack it deals or decreasing the damage received. What I want to do is to create a tool to be used outside the game enabling players to try out different builds for their champions and compare the figures against other champions they usually fight against. The goal is to enable players get a deeper understanding of the different item combinations (builds) that can be used during the games, instead of trying them out in real games which can be somehow very time consuming. What I'm stuck at is the best practice I should follow to make this possible using Java, I can't figure out which classes should inherit from which, should I make champions and items specs in the code or extracted from other files, specially that I'm talking about hundreds of items and champions to use in that tool. I'm self studying Java, and I don't have much practice at it, so I would really appreciate any broad guidelines regarding this, and sorry if my question doesn't fit here, I tried to follow the rules. English isn't my native language, so I'm really sorry if I wasn't clear enough, I would be more than happy to explain anything that's not understood.

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  • Can't connect to windows 7 ad-hoc network

    - by Nikolaj
    Good day! I have installed ubuntu 12.04 on my laptop and I need to have network connection on it. Have a desktop PC, where I've created ad-hoc wi-fi network(Windows 7) and can't connect to it. So, problem: I see my network in the list of networks to connect, but I cant connect to it because it's grey color and not active(can't click on it). Could somebody help me to solve that problem? Thanks in advance!

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  • the requested resource is not available [closed]

    - by James Pj
    I have written a Java servlet program and run it through local Tomcat 7, But it was showing following error : HTTP Status 404 - /skypark/registration type Status report message /skypark/registration description The requested resource is not available. Apache Tomcat/7.0.33 I don't know what was the reason for it my Html page is <html> <head> <title> User registration </title> </head> <body> <form action="registration" method="post"> <center> <h2><b>Skypark User Registration</b></h2> <table border="0"> <tr><td> First Name </td><td> <input type="text" name="fname"/></br> </td></tr><tr><td> Last Name </td><td> <input type="text" name="lname"/></br> </td></tr><tr><td> UserName </td><td> <input type="text" name="uname"></br> </td></tr><tr><td> Enter Password </td><td> <input type="password" name="pass"></br> </td></tr><tr><td> Re-Type Password </td><td> <input type="password" name="pass1"></br> </td></tr><tr><td> Enter Email ID </td><td> <input type="email" name="email1"></br> </td></tr><tr><td> Phone Number </td><td> <input type="number" name="phone"> </td></tr><tr><td> Gender<br> </td></tr><tr><td> <input type="radio" name="gender" value="Male">Male</input></br> </td></tr><tr><td> <input type="radio" name="gender" value="Female">Female</input></br> </td></tr><tr><td> Enter Your Date of Birth<br> </td><td> <Table Border=0> <tr> <td> Date </td> <td>Month</td> <td>Year</td> </tr><tr> <td> <select name="date"> <option value="1">1</option> <option value="2">2</option> <option value="3">3</option> <option value="4">4</option> <option value="5">5</option> . . . have some code . . . </table> <input type="submit" value="Submit"></br> </center> </form> </body> </html> My servlet is : package skypark; import skypark.*; import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import java.sql.*; public class Registration extends HttpServlet { public static Connection prepareConnection()throws ClassNotFoundException,SQLException { String dcn="oracle.jdbc.driver.OracleDriver"; String url="jdbc:oracle:thin:@JamesPJ-PC:1521:skypark"; String usname="system"; String pass="tiger"; Class.forName(dcn); return DriverManager.getConnection(url,usname,pass); } public void doPost(HttpServletRequest req,HttpServletResponse resp)throws ServletException,IOException { resp.setContentType("text/html"); PrintWriter out=resp.getWriter(); try { String phone1,uname,fname,lname,dob,address,city,state,country,pin,email,password,gender,lang,qual,relegion,privacy,hobbies,fav; uname=req.getParameter("uname"); fname=req.getParameter("fname"); lname=req.getParameter("lname"); dob=req.getParameter("date"); address=req.getParameter("address"); city=req.getParameter("city"); state=req.getParameter("state"); country=req.getParameter("country"); pin=req.getParameter("pin"); email=req.getParameter("email1"); password=req.getParameter("password"); gender=req.getParameter("gender"); phone1=req.getParameter("phone"); lang=""; qual=""; relegion=""; privacy=""; hobbies=""; fav=""; int phone=Integer.parseInt(phone1); Connection con=prepareConnection(); String Query="Insert into regdetails values(?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)"; PreparedStatement ps=con.prepareStatement(Query); ps.setString(1,uname); ps.setString(2,fname); ps.setString(3,lname); ps.setString(4,dob); ps.setString(5,address); ps.setString(6,city); ps.setString(7,state); ps.setString(8,country); ps.setString(9,pin); ps.setString(10,lang); ps.setString(11,qual); ps.setString(12,relegion); ps.setString(13,privacy); ps.setString(14,hobbies); ps.setString(15,fav); ps.setString(16,gender); int c=ps.executeUpdate(); String query="insert into passmanager values(?,?,?,?)"; PreparedStatement ps1=con.prepareStatement(query); ps1.setString(1,uname); ps1.setString(2,password); ps1.setString(3,email); ps1.setInt(4,phone); int i=ps1.executeUpdate(); if(c==1||c==Statement.SUCCESS_NO_INFO && i==1||i==Statement.SUCCESS_NO_INFO) { out.println("<html><head><title>Login</title></head><body>"); out.println("<center><h2>Skypark.com</h2>"); out.println("<table border=0><tr>"); out.println("<td>UserName/E-Mail</td>"); out.println("<form action=login method=post"); out.println("<td><input type=text name=uname></td>"); out.println("</tr><tr><td>Password</td>"); out.println("<td><input type=password name=pass></td></tr></table>"); out.println("<input type=submit value=Login>"); out.println("</form></body></html>"); } else { out.println("<html><head><title>Error!</title></head><body>"); out.println("<center><b>Given details are incorrect</b>"); out.println(" Please try again</center></body></html>"); RequestDispatcher rd=req.getRequestDispatcher("registration.html"); rd.include(req,resp); return; } } catch(Exception e) { out.println("<html><head><title>Error!</title><body>"); out.println("<b><i>Unable to process try after some time</i></b>"); out.println("</body></html>"); RequestDispatcher rd=req.getRequestDispatcher("registration.html"); rd.include(req,resp); return; } out.flush(); out.close(); } } And the web.xml file is <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0" metadata-complete="true"> <servlet> <servlet-name>reg</servlet-name> <servlet-class>skypark.Registration</servlet-class> </servlet> <servlet-mapping> <servlet-name>reg</servlet-name> <url-pattern>/registration</url-pattern> </servlet-mapping> This i kept in C:\Program Files\Apache Software Foundation\Tomcat 7.0\webapps\skypark\WEB_INF\web.xml and servlet class in C:\Program Files\Apache Software Foundation\Tomcat 7.0\webapps\skypark\WEB_INF\classes\skypark and registration.html in C:\Program Files\Apache Software Foundation\Tomcat 7.0\webapps\skypark\ if any mistake in this makes above error means please help me.Thanks in advance....

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  • HP DV6 connects but no internet

    - by Frank Barcenas
    I have a Hewlett Packard DV6. I connected to the access point. I receive an IP address/default gateway/DNS,etc(DHCP). I cannot ping my gateway. DNS lookups fails. There is just no connectivity. My driver is listed as being IWLWIFI. An lspci shows my card to be a Realtek RTL8101E/RTL8102E. I can't ping myself from another computer. eth0 Link encap:Ethernet HWaddr c8:0a:a9:0c:a7:45 UP BROADCAST MULTICAST MTU:1500 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) Interrupt:41 Base address:0xe000 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:561 errors:0 dropped:0 overruns:0 frame:0 TX packets:561 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:42164 (42.1 KB) TX bytes:42164 (42.1 KB) wlan0 Link encap:Ethernet HWaddr 00:26:c7:04:97:c0 inet addr:192.168.1.109 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::226:c7ff:fe04:97c0/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:12 errors:0 dropped:0 overruns:0 frame:0 TX packets:71 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:2035 (2.0 KB) TX bytes:12371 (12.3 KB)

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  • How to identify web development benchmarking questions? [closed]

    - by GenericJam
    I am in my final year of college and I have to put forward some sort of thesis for my final year project. The project is a web based attendance system that I am building for the college. I have it about 70% complete in Java. After completing it in Java, the plan is for me to rewrite the server bit in Erlang and then release the bitter rivals in a head to head cage match. The idea being that there is some sort of grounds for comparison. There are a few hurdles along the way, such as me learning Erlang. I understand that a performance comparison like this isn't strictly scientific as there are many factors such as the programmer (myself); the hardware it runs on; etc... but it is meant to be a reasonable comparison of the merits of using Java vs. Erlang for web development. I need help in identifying what the relevant questions are that my project could address. Even though the project scope is fixed, I am trying to shoehorn in some worthwhile scientific inquiries.

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  • Wifi won't connect to certain networks

    - by Dave M G
    As I write this, I'm in a coffee shop on my laptop, and I am trying to connect to the free wifi network they offer. Every time I select their network from the wifi applet drop down menu, it connects for a second and then disconnects. At the same time, I have my Android phone with me, and it connects to the coffee shop's network without problem. There are a couple of people around me also using the same network with no issues. I asked the staff to check and as far as they can tell there is no problem with their router or anything. I have tried rebooting, but it has not made a difference. I have double and triple checked that I am using the correct WEP password. As an added wrinkle, when I connect to another network, it seems to connect (although I can't use them because they are paid gateway services). So I'm able to ask this question now because I have tethered my laptop to my phone, but it's slow and a workaround, not a solution. All indications are that it's a problem with my computer against this one network. Why would that be and how can I fix it?

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  • Ubuntu 12.10 WiFi Problems

    - by Sean Webber
    I have a 32 bit machine running Ubuntu 12.10 with WiFi on it. I have a WPA2 network at home, but if I leave the USB Adapter plugged in while it boots, it infinitely keeps asking for the network password but never connects. If I plug it in after boot, it will connect but then I can't access ANYTHING on the LAN or Internet because "the DNS servers are unreachable". Now, if I leave the computer on a while, I get lucky sometimes and it MAGICALLY decides to connect for a little bit, lock the machine though and the Internet's gone again. The weirdest thing, is when I am connected but can't get to the internet, I do a netstat or ifconfig wlan0, I do have an IP address and everything. It says I'm connected but its not. I have a Realtek RTL8188CU USB adapter.

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  • Wifi stops working in 13.10

    - by Vitor
    OK, my wifi is connecting fine, but it just stop downloading and uploading data. The skype stops, trying to reconnect, the firefox nighly and the google chromium stops loading pages and websites, everythings stops. But when I see the network icon: connected to my wifi. Then, I simply reconnect, or disconnect and connect again. Reconnecting, the wifi starts working again, the skype icon turns green, the browsers work again. Previously, I had 13.04 and never had this problem. When I upgraded to Ubuntu 13.10, the wifi started to do this. And the wifi has this problem since the early times of 13.10; since I installed 13.10, the wifi is having this issue (from the first day I installed it). Anyone having the same problem? Anyone knows how to fix it?

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  • 3G dongle and memory card detection

    - by user212632
    My questions is about 3G dongle (Huawei E1752) that I use for my internet on Ubuntu 12.04. The big issue is that ubuntu only recognise the dongle if I plug it in before booting up. But if somehow I loses connection (due to network being low) then the only way to use the 3G dongle again is to reboot my machine, which becomes a pain. I have the same issue with the memory card reader of my laptop whereby it only reads when I insert the card before booting up. My laptop is an Acer V3 -571g. At first I thought it was an issue that the model was quite new, but I have been updating my ubuntu for a while, and this issue has kept being the same

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  • Installing driver for Ralink Realtek 8187 WiFi adapter

    - by capcom
    I purchased a WiFi adapter online, and it came with an installation CD with drivers. I installed it just fine on Windows, and am now trying on Ubuntu 10.10. The CD came with the driver files for Linux as well, but I have no idea why they aren't working - my guess is that I don't properly understand what to do with them. I have uploaded the contents of the folder which came with the CD here. There is a README in there, but the instructions under the installation header didn't get me anywhere unfortunately. The Device ID is: Bus 001 Device 002: ID 148f:5370 Ralink Technology, Corp. Thanks.

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  • Is it possible to configure Apple's Magic Mouse to be recognised on start up?

    - by Dave
    This question may apply more roundly to all bluetooth mice but in my case I am dealing with an Apple Magic Mouse. I have followed the set up instructions here; https://wiki.ubuntu.com/Multitouch/AppleMagicMouse closely. I have even removed the mouse and started from scratch more than once repeating each step described carefully. Every time the computer is started it does not see the Magic Mouse by default. I need to keep a wired mouse connected to the computer at all times which I use to log in with then connect the Magic Mouse, in a somewhat counter-intuitive exercise! Any help would be greatly appreciated.

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  • Transfer a ssh session between the same physical devices from one network to another

    - by Vivek V K
    My server has 2 IP addresses via two networks. Due to some restrictions,my client will be able to access only one of the network at a time. Hence, I want a way to transfer a live ssh session with all the open applications seamlessly from one network to another. The physical devices (client and the server) are the same. What changes is the network through which it connects. can this be done? Thanks!

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  • wifi works only after connecting through wire

    - by orustam
    I have fresh installed ubuntu 12.04. it is my first ubuntu installation and i'm a bit confused about the network connection. Wifi shows up and connects(at least it shows that the connection is established), but i can't open any pages, i've tried to ping some sites and it fails either. If i try to connect through a wire it works, what is interesting to me is that after i used my wire connection i can use my wifi properly without a wire pluged in. i think it probably has to do with my settings? I tried to find a solution but can figure it out on my own. My Proxy set to none(have applied it system wide) Please help me if you have any clue:)

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  • How to connect MTS MBlaze

    - by murali_ma
    i have installed ubuntu 11.04 inside the windows xp. i have MTS Mblaze USB Modem. (my service provider is MTS MBlaze,india) i want to use Mblaze into ubuntu so that i did the following steps for make connecting the device. from the task bar->edit connections->mobile broadband->choose country->mts mblaze and ok i give username and password ([email protected] and password MTS. ok now i enable mobile broadband , MTS MBlaze connection1(connection name) from task bar. steps followed from "http://randomshandom.wordpress.com/2010/12/20/how-to-connect-mts-mblaze-device-in-ubuntu-10-10-11-04/#more-3" for the first time it successfully connected and browse the internet. after i restart the system i connect it. it does not connected. it shows Modem network disconnected. i accessed many times and delete the connection and recreated but i does not help me. if i try to connect device i think it the search the network, i saw the wave signal. img Image for showing problem:

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  • The better way to ask for input?

    - by Skippy
    I am wondering which is the best way to go with java code. I need to create a class with simple prompts for input.. I have tried using both classes and cannot work out the particular benefits for each. Is this because I am still in the early stages of programming or are there situations that will occur as it becomes more complex?? import java.util.Scanner; public class myClass { Scanner stdin = new Scanner(System.in); public String getInput(String prompt) { System.out.print(prompt); return stdin.nextLine(); } ... or import java.io.*; public class myClass { public static void main(String[] args) throws IOException { BufferedReader stdin = new BufferedReader (new InputStreamReader (System.in)); System.out.print("Input something: "); String name = stdin.readLine(); I know these examples are showing different methods within these classes, but thought this might serve well for the discussion. I'm really not sure which site is the best to ask this on.

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  • Need in obtaining a specific local telephone number [closed]

    - by Brett
    I am wanting a local phone number that I like. I have found one that I like. When I call the number that I want it says "this number has not been allocated" I have looked up and found the company that owns that number. How do I go about acquiring that number from the company. I spoke with someone who sells major phone packages and he said that if I signed up with them he could get the number for me. He said that there is a change of ownership form that the send to get the number. So I know it can be done. I am hoping that someone with industry specific knowledge in this area can guide me in getting this number.

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  • ERROR while getting interface

    - by user284391
    I have installed the latest version of aircrack-ng, but when i run this code, sudo airmon-ng start wlan0 I get this. sudo airmon-ng start wlan0 Found 4 processes that could cause trouble. If airodump-ng, aireplay-ng or airtun-ng stops working after a short period of time, you may want to kill (some of) them! -e PID Name 463 avahi-daemon 475 avahi-daemon 683 NetworkManager 756 wpa_supplicant Interface Chipset Driver wlan0 Broadcom wl - [phy0]mon0: ERROR while getting interface flags: No such device (monitor mode enabled on mon0) Is there anyone who could help me get this problem solved please.

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  • Installing 12.04 through Update Manager on a XP/ubuntu dual-boot

    - by Madeline Mcormick
    I currently have a dual-boot system running XP Pro SP3 with Ubuntu 10.04 LTS. I decided to upgrade to 12.04 using the Update Manager from the network and NOT using ISO CD version. Now that I am in the middle of 12.04 installation, I have this immense fear that this upgrade from update manager on the network server may affect my Win XP OS and may render it un-bootable. I tried backing up files while its upgrading to Ubuntu but it does not recognize any external media like external HDD. What should I do?

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  • Dell Vostro 1520 wifi not working with Ubuntu 12.04

    - by user65696
    I have installed Ubuntu 12.04 on Dell Vostro 1520 Laptop. But found Wifi is hardware locked, though wifi is working perfectly fine with Windows 7 in the same laptop. I tried to upgrade the drivers as mentioned in other posts/forums but could not resolve the issue. I had the similar problem with versions 11.* as well. Last time the Wifi worked with 10.* version. Please help me to get it resolved.

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