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  • Java newbie problem: classes of the same package accessing one another?

    - by HH
    Test.java and SetWord.java belong to the package tools. Test.java needs to access SetWord but an odd error 'cannot find' SetWord appear. The package limits the visibility, it works without 'package tools;' lines. How can I acess the SetWords with Test in the same pkg? In general, how can classes access one another in the same pkg? Test.java package tools; import java.io.*; import java.util.*; public class Test{ public static void main(String[] args) { //IT CANNOT FIND SetWords despite the same folder, why? SetWord sw=new SetWord(); System.out.println(st.set("HELLO)"); } } SetWord.java package tools; import java.io.*; import java.util.*; public class SetWord{ public SetWord(){} public String set(String s) { return s.trim().toLowerCase(); } }

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  • Nginx frontend for AppEngine dev server

    - by benasio
    How to configure nginx for load static ? Static should be given only by the nginx server , everything else nginx + dev_appserver and workingon the same host (localhost or localhost: port) Example request html http://localhost -> nginx -> dev_appserver request static files http://localhost -> nginx

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  • Why this C# Regular Expression crashes my program?

    - by robert_d
    using System; using System.IO; using System.Net; using System.Text.RegularExpressions; namespace Working { class Program4 { static string errorurl = "http://www.realtor.ca/propertyDetails.aspx?propertyId=8692663"; static void Main(string[] args) { string s; s = getWebpageContent(errorurl); s = removeNewLineCharacters(s); getFields(s); Console.WriteLine("End"); } public static void getFields(string html) { Match m; string fsRE = @"ismeasurement.*?>.*?(\d+).*?sqft"; m = Regex.Match(html, fsRE, RegexOptions.IgnoreCase); } private static string removeNewLineCharacters(string str) { string[] charsToRemove = new string[] { "\n", "\r" }; foreach (string c in charsToRemove) { str = str.Replace(c, ""); } return str; } static string getWebpageContent(string url) { WebClient client = new WebClient(); client.Headers.Add("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705;)"); Stream data = client.OpenRead(url); StreamReader reader = new StreamReader(data); string s = reader.ReadToEnd(); data.Close(); reader.Close(); return s; } } } This program hangs. It runs correctly when I remove RegexOptions.IgnoreCase option or when I remove call to removeNewLineCharacters() function. Could someone tell me what is going on, please?

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  • Linq to NHibernate - How to return a parent object with only certain child objects included

    - by vakman
    Given a simplified model like the following: public class Enquiry { public virtual DateTime Created { get; set; } public virtual Sender Sender { get; set; } } public class Sender { public virtual IList<Enquiry> Enquiries { get; set; } } How can you construct a Linq to Nhibernate query such that it gives you back a list of senders and their enquiries where the enquiries meet some criteria. I have tried something like this: return session.Linq<Enquiry>() .Where(enquiry => enquiry.Created < DateTime.Now) .Select(enquiry => enquiry.Sender) In this case I get an InvalidCastException saying you can't cast type Sender to type Enquiry. Any pointers on how I can do this without using HQL?

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  • C doubt regarding array of pointers please explain

    - by ramya
    why do we use static with array of pointers?what is the relation betwwen static and array of pointers??plz help.... for eg: main() { int a[]={1,2,3}; int *p[]={a,a+1,a+2}; ...... } this code shows illegal initialization.why?whereas the following code works main() { static int a[]={1,2,3}; static int *p[]={a,a+1,a+2}; ...... } please do clear my doubt as soon as possible....

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  • In Grails, How can I create a domain model to link two of another model?

    - by gerges
    Hey all, I'm currently trying to create a Friendship domain object to link two User objects (with a bit of additional data: createDate, confirmedStatus). My domain model looks as follows class Friendship { User userOne User userTwo Boolean confirmed Date createDate Date lastModifiedDate static belongsTo = [userOne:User , userTwo:User] static constraints = { userOne() userTwo() confirmed() createDate() lastModifiedDate() } } I've also added the following entries to the user class static hasMany = [ friendships:Friendship ] static mappedBy = [ friendships:'userOne' , friendships:'userTwo' ] When I do this, the result is a new friendship created (and viewable through the controller) with both users listed in their respective places. When I view the details of userOne, I see the friedship listed. When I view the details of userTwo, no friendship is listed. This is not the behavior I expected. What am I doing incorrectly? Why can't I see the friendship listed under both users?

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  • Java cannot find symbol enum

    - by JDelage
    Hi, I'm modeling a chess game on Java, and I'm having some problem. Here's what the code looks like (the relevant parts): Enum class Couleur.java: public enum Couleur {BLANC, NOIR} Piece.java: public abstract class Piece { (...) public Piece(Couleur couleurParam){ this.couleurPiece = couleurParam; } (...) } And finally Tour.java: public class Tour extends Piece { (...) public Tour(Couleur couleurParam){ super(couleurParam); } (...) } All the .java files are in the same folder. Yet at compile I get a "cannot find symbol symbol : variable NOIR location: class Plateau" (Plateau is the class that instantiates Tour.) Can anyone help me figure out what's wrong here? Many thanks, JDelage

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  • How do you resolve the common naming collision between type and object?

    - by Catskul
    Since the standard c# convention is to capitalize the first letter of public properties, the old c++ convention of initial capital for type names, and initial lowercase for non-type names does not prevent the classic name collision where the most obvious object name matches the type name: class FooManager { public BarManager BarManager { get; set; } // Feels very wrong. // Recommended naming convention? public int DoIt() { // 1st and 2nd Bar Manager are different symbols return BarManager.Blarb + BarManager.StaticBlarb; } } class BarManager { public int Blarb { get; set; } public static int StaticBlarb { get; set; } } It seems to compile, but feels so wrong. Is there a recommend naming convention to avoid this?

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  • What is the simplest way to map a folder on the file system to a url in Tomcat?

    - by Simon
    Here's my problem... I have a small prototype app (happens to be in Grails hosted on AWS) and I want to add the ability of the user to upload a few (max 10) images. I want to persist these images on disk on the server machine, in a folder location which is outside my WAR. I realise that there is probably a super-scalable solution involving more web servers and optimised static asset serving, but for the approximately 100 users I am likely to get, it's really not worth the effort and cost. So, what is the simplest way I can have a virtual folder from my url map to a physical folder on disk? I sort of want... http://myapp.com/static to map to a folder which I can configure e.g. /var/www/static so I can then have in my code... <img src="/static/user1/picture.jpg"/> I don't particularly mind whether the resulting physical folders are directly browsable. Security will eventually be an issue, but it isn't at the start. So, what are my options? I have looked at virtual hosts on the apache site, but it feels more complicated than I need. I don't want to use the Grails static rendering plugins.

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  • to write log files in two different files

    - by Sun
    my application run on customized client framework,the client framework used log4net to log their own log files. we are(our application) has to use the same log4net to log our log files in our own path(say our customized path). currently the our log files are created but log are not writing in that file.it is writting in the client framework log file. searched lot of sites the link http://stackoverflow.com/questions/308436/log4net-programmatcially-specify-multiple-loggers-with-multiple-file-appenders helped me to configure the log4net config programatically, still im log statemets are not written in my log file.the code used as below public class TraceLog { private string message = string.Empty; private static ILog ILogger = null; private static TraceLog instance = new TraceLog(); private TraceLog() { SetLevel("Log4net.MainForm", "ALL"); AddAppender("Log4net.MainForm", CreateFileAppender("FileAppender", "C:\\mylog.log")); } public static TraceLog Instance { get { return instance; } } public void Debug(string logMessage) { message = PrepareLog(logMessage); ILogger.Debug(message); } protected string PrepareLog(string logMessage) { string message = GetFileMethodLineNumberInfo(); message += logMessage; return message; } protected string GetFileMethodLineNumberInfo() { StackTrace stackTrace = new StackTrace(true); // The position 3 is relative to the index of the specified method StackFrame stackFrame = stackTrace.GetFrame(3); return (stackFrame.GetMethod().DeclaringType.Name + "/" + stackFrame.GetMethod().Name + "/" + stackFrame.GetFileLineNumber() + ":"); } private static void SetLevel(string loggerName, string levelName) { ILogger = LogManager.GetLogger(loggerName); log4net.Repository.Hierarchy.Logger l = (log4net.Repository.Hierarchy.Logger)ILogger.Logger; l.Level = l.Hierarchy.LevelMap[levelName]; } private static void AddAppender(string loggerName, IAppender appender) { ILogger = LogManager.GetLogger(loggerName); log4net.Repository.Hierarchy.Logger l = (log4net.Repository.Hierarchy.Logger)ILogger.Logger; l.AddAppender(appender); } private static IAppender CreateFileAppender(string name, string fileName) { FileAppender appender = new FileAppender(); appender.Name = name; appender.File = fileName; appender.AppendToFile = true; //PatternLayout layout = new PatternLayout(); //layout.ConversionPattern = "%d [%t] %-5p %c [%x] - %m%n"; //layout.ActivateOptions(); //appender.Layout = layout; appender.ActivateOptions(); return appender; } } } anyone pls help how to solve this

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  • Can I set a PHP class property from an existing variable?

    - by jasondavis
    I am trying to figure out how I want to handle settings in my PHP app. I have pretty much decide that I would like to use a Confg class file so it will be autoloaded and flexible in the future. Below is some stuff I was playing with. I know you cannot set a variable to popluate a Constant so I then try to use a public static property. Why can I not set public static $ip = $_SERVER['REMOTE_ADDR']; ?? <?php // config.class.php class Config { const URL = 'http://www.foo.com'; const DB_User = 'dbname'; public static $test = 'test string'; public static $ip = $_SERVER['REMOTE_ADDR']; } /////////////////////////////////////////////////////// //index.php // works echo Config::URL; // works echo Config::$test; // DOES NOT WORK echo Config::$ip; ?>

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  • Playing craps, asking and printing

    - by Angelo Mejia
    How do I ask the amount of games of craps someone wants to play and print the number of wins as a result of n number of games? Also How do I make a table in the main method using the previous methods I have? A table like this but shows the results: Percent Wins Games Experiment Number 1 2 3 4 5 6 7 8 9 10 100 1000 10000 100000 1000000 public class CrapsAnalysis { public static int rollDie( int n) { return (int)(Math.random()*n) + 1 ; } public static int rollDice( ) { int die1 ; int die2 ; die1 = rollDie(6) ; die2 = rollDie(6) ; return die1 + die2 ; } public static boolean playOneGame( ) { int newDice ; //repeated dice rolls int roll ; //first roll of the dice int playerPoint = 0 ; //player point if no win or loss on first roll newDice = rollDice() ; roll = rollDice() ; if (roll == 7 || roll == 11) return true; else if (roll == 2 || roll == 3 || roll == 12) return false; else { playerPoint = roll; newDice = rollDice(); do { newDice = rollDice(); } while (newDice != playerPoint || newDice != 7) ; if (newDice == 7) return false; else return true; } } public static int playGames ( int n ) { int numWon = 0; for (int i = 1; i <= n; i++) if(playOneGame()) numWon++; return numWon; } public static void main(String[] args) { //Don't know how to ask and print out the results of the number of wins depending on the n number of games played } }

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  • Convert long number as string in the serialization

    - by Bruno
    I have a custom made class that use a long as ID. However, when I call my action using ajax, my ID is truncated and it loses the last 2 numbers because javascript loses precision when dealing with large numbers. My solution would be to give a string to my javascript, but the ID have to stay as a long on the server side. Is there a way to serialize the property as a string? I'm looking for some kind of attribute. Controller public class CustomersController : ApiController { public IEnumerable<CustomerEntity> Get() { yield return new CustomerEntity() { ID = 1306270928525862486, Name = "Test" }; } } Model public class CustomerEntity { public long ID { get; set; } public string Name { get; set; } } JSON Result [{"Name":"Test","ID":1306270928525862400}]

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  • Entity framework with Linq to Entities performance

    - by mare
    If I have a static method like this public static string GetTicClassificationTitle(string classI, string classII, string classIII) { using (TicDatabaseEntities ticdb = new TicDatabaseEntities()) { var result = from classes in ticdb.Classifications where classes.ClassI == classI where classes.ClassII == classII where classes.ClassIII == classIII select classes.Description; return result.FirstOrDefault(); } } and use this method in various places in foreach loops or just plain calling it numerous times, does it create and open new connection every time? If so, how can I tackle this? Should I cache the results somewhere, like in this case, I would cache the entire Classifications table in Memory Cache? And then do queries vs this cached object? Or should I make TicDatabaseEntities variable static and initialize it at class level? Should my class be static if it contains only static methods? Because right now it is not.. Also I've noticed that if I return result.First() instead of FirstOrDefault() and the query does not find a match, it will issue an exception (with FirstOrDefault() there is no exception, it returns null). Thank you for clarification.

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  • Problem invoking C DLL in C#

    - by CristiC
    I'm currently trying to invoke a method made in C from C# C code looks like this: extern "C" int addSum(int a, int b) { return a*b; } extern "C" int getCount() { return 12; } and C# code looks like this: [DllImport("mydll.dll", SetLastError=true)] private static extern int addSum(IntPtr a, IntPtr b); [DllImport("mydll.dll", SetLastError = true)] private static extern int getCount(); public static int mySum(int a, int b) { return suma(a, b); } public static int getMyCount() { return getCount(); } The code returns the right values but i'm getting the following error: addSum' has unbalanced the stack. This is likely because the managed PInvoke signature does not match the unmanaged target signature. Check that the calling convention and parameters of the PInvoke signature match the target unmanaged signature. Any sugestion regarding this issue ? Thanks

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  • StreamTokenizer Iterator Adapter help

    - by alpdog14
    I have this StreamTokenizer Iterator Adapter that is suppose to create a Tokenizer Iterator Index Builder then build the index from a STIA wrapped around a StreamTokenizer. I am having trouble implementing the hasNext and Next for my STIA, can anyone help me, here is my class: public class StreamTokenizerIteratorAdapter implements Iterator<Token> { DefaultIndexImpl index; StreamTokenizer source; public StreamTokenizerIteratorAdapter(final StreamTokenizer source) { if (source == null) throw new IllegalArgumentException("source == null"); } @Override public boolean hasNext() { return !index.isEmpty(); } public Token next() { if(!index.isEmpty()) return next(); else return null; } @Override public void remove() { throw new UnsupportedOperationException(); } } Should I be using the source element in the hasNext() and next()?

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  • WCF returning custom types

    - by Gena Verdel
    Hi. I'm a newbie to WCF, trying to perform relatively simple task. I'm trying to return list of objects read from the database but cannot overcome some really annoying exceptions. The question is very simple? What's wrong with the picture? [ServiceContract] public interface IDBService { [OperationContract] string Ping(string name); [OperationContract] InitBDResult InitBD(); } public InitBDResult InitBD() { _dc = new CentralDC(); InitBDResult result = new InitBDResult(); result.ord = _dc.Orders.First(); return result; } [DataContract] public class InitBDResult { //[DataMember] //public List<Order> Orders { get; set; } [DataMember] public Order ord { get; set; } }

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  • Why `is_base_of` works with private inheritance?

    - by Alexey Malistov
    Why the following code works? typedef char (&yes)[1]; typedef char (&no)[2]; template <typename B, typename D> struct Host { operator B*() const; operator D*(); }; template <typename B, typename D> struct is_base_of { template <typename T> static yes check(D*, T); static no check(B*, int); static const bool value = sizeof(check(Host<B,D>(), int())) == sizeof(yes); }; //Test sample class B {}; class D : private B {}; //Exspression is true. int test[is_base_of<B,D>::value && !is_base_of<D,B>::value]; Note that B is private base. Note that operator B*() is const. How does this work? Why this works? Why static yes check(D*, T); is better than static yes check(B*, int); ?

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  • Is there a Java 1.5 varargs API for slf4j yet?

    - by Josh
    I want to get rid of this lot... public void info(String msg); public void info(String format, Object arg); public void info(String format, Object arg1, Object arg2); public void info(String format, Object[] argArray); ...and replace it with this one... public void info(String format, Object ... args); ...so that my logging syntax doesn't have to change depending on the number of arguments I want to log. There seems to be lots of discussion and work around it, but where is it? Or should I wrap the wrapper that is slf4j?

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  • Synchronizing access to an inner object's methods?

    - by user291701
    Suppose I have the following: public class Foo { private ReadingList mReadingList = new ReadingList(); public ReadingList getReadingList() { synchronized (mReadingList) { return mReadingList; } } } If I try modifying the ReadingList object in two threads, the synchronization above won't help me, right?: // Thread 1 foo1.getReadingList().setName("aaa"); // Thread 2 foo2.getReadingList().setName("bbb"); do I have to wrap each method I want synchronized like so: public class Foo { private ReadingList mReadingList = new ReadingList(); public synchronized void setReadingListName(String name) { mReadingList.setName(name); } public synchronized void setReadingListAuthor(String author) { mReadingList.setAuthor(author); } ... and so on for each method of ReadingList I want exposed and synched? I'd end up just writing wrapper methods for each method of ReadingList. Thanks

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  • Lock thread using somthing other than a object

    - by Scott Chamberlain
    when using a lock does the thing you are locking on have to be a object. For example is this legal static DateTime NextCleanup = DateTime.Now; const TimeSpan CleanupInterval = new TimeSpan(1, 0, 0); private static void DoCleanup() { lock ((object)NextCleanup) { if (NextCleanup < DateTime.Now) { NextCleanup = DateTime.Now.Add(CleanupInterval); System.Threading.ThreadPool.QueueUserWorkItem(new System.Threading.WaitCallback(cleanupThread)); } } return; } EDIT-- From reading SLaks' responce I know the above code would be not valid but would this be? static MyClass myClass = new MyClass(); private static void DoCleanup() { lock (myClass) { // } return; }

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  • How to raise CComponent event in Yii

    - by srigi
    Let's assume I have Component (say Graph like Yahoo Finance) rendered on the page. Component view template contains bunch of a_hrefs which I wanto to switch period in graph. I created Event and Event handler in Component. I have two questions: How to raise event on Graph Component via those a_hrefs (should they be part of Graph?)? How to redraw Graph without loosing curent page context (section, filter - specified as $_GET values)? My Graph Component look like this: Yii::import('zii.widgets.CPortlet'); class Graph extends CPortlet { private $_period; /* ********************** * * COMPONENT PROPERTIES * * ********************** */ public function getPeriod() { return $this-_period; } public function setPeriod($period) { $this-_period = $period; } /* ********************** * * GENERIC * * ********************** */ public function init() { parent::init(); // assign event handlers $this-onPeriodChange = array($this, 'handlePeriodChange'); } protected function renderContent() { $this-render('graph'); } /* ********************** * * EVENTS * * ********************** */ public function onPeriodChange($event) { $this-raiseEvent('onPeriodChange', $event); } /* ********************** * * EVENT HANDLERS * * ********************** */ public function handlePeriodChange($event) { // CODE } }

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  • A member variable's hashCode() value is different

    - by Jacques René Mesrine
    There's a piece of code that looks like this. The problem is that during bootup, 2 initialization takes place. (1) Some method does a reflection on ForumRepository & performs a newInstance() purely to invoke #setCacheEngine. (2) Another method following that invokes #start(). I am noticing that the hashCode of the #cache member variable is different sometimes in some weird scenarios. Since only 1 piece of code invokes #setCacheEngine, how can the hashCode change during runtime (I am assuming that a different instance will have a different hashCode). Is there a bug here somewhere ? public class ForumRepository implements Cacheable { private static CacheEngine cache; private static ForumRepository instance; public void setCacheEngine(CacheEngine engine) { cache = engine; } public synchronized static void start() { instance = new ForumRepository(); } public synchronized static void addForum( ... ) { cache.add( .. ); System.out.println( cache.hashCode() ); // snipped } public synchronized static void getForum( ... ) { ... cache.get( .. ); System.out.println( cache.hashCode() ); // snipped } }

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  • How do you resolve the common collsision between type name and object name?

    - by Catskul
    Since the convention is to capitalize the first letter of public properties, the old c++ convention of initial capital for type names, and initial lowercase for non-type names does not prevent the classic name collision class FooManager { public BarManager BarManager { get; set; } // Feels very wrong. // Recommended naming convention? public int DoIt() { return Foo.Blarb + Foo.StaticBlarb; // 1st and 2nd Foo are two // different symbols } } class BarManager { public int Blarb { get; set; } public static int StaticBlarb { get; set; } } It seems to compile, but feels so wrong. Is there a recommend naming convention to avoid this?

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  • Circular Tally Counter Not Rolling Over

    - by chris ward
    I was practicing my java and was trying to make a simple counter with rollover at max, but for some reason it isn't rolling over. Any advice? public class HandTallyCounter { private int max; private int count; public HandTallyCounter(int max) { this.max = max; count = 0; } public void click() { if (count++ > max) { count = 0; } } public int getCount() { return count; } public void reset() { count = 0; } }

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