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  • Thread Code...anything wrong with this, must use java 1.4

    - by bmw0128
    I have a servlet automatically firing up when the app server starts, and in its init(), I'm making another thread: init(){ new FooThread() } in FooThread(), i want to periodically check the status of a DB value, then depending on the value, make a web service call. When these two tasks complete, I want the thread to sleep to wait a certain period then repeat. This cycle would just continue forever. FooThread: public class FooThread implements Runnable{ Thread t; FooThread(){ t = new Thread(this, "BBSThread"); logger.info("*** about to start " + t.getName()); t.start(); logger.info("*** started: " + t); } public void run() { try{ while(true){ //do the db check, then conditionally do the web services call logger.info("*** calling sleep() ***"); Thread.sleep(50000); logger.info("*** now awake ***"); } } catch (InterruptedException e) { System.out.println("*** FooThread interrupted"); } } }

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  • How can I tell that a NetTcp-based WCF connection was interrupted?

    - by mafutrct
    A WCF service is based on NetTcpBinding. It may happen that the client silently vanishes, leaving the server thinking that it is still connected. I'm currently using a thread that pings all connected client to see if they are still alive, and removes disconnected clients. Is a ping thread the correct way to solve the issue, or is there a better, possibly event-based way? Do I have to surround every code that communicates with the client by try/catch and remove it from the list of connected clients additionally?

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  • WPF UserControl event called only once?

    - by 742
    Hi Everyone, I need to bind two-way a property of a user control to a property of a containing user control. I also need to set a default value to the property from code in the child (cannot be done easily from XAML tags). If I call my code from the child constructor, the value is set in the parent but the change callback routine is not triggered (my understanding is that the parent doesn't yet exist at the time the child is created). My current workaround is to catch the Loaded event of the child and to call the code from the handler. Howver as Loaded is called more than once, I need to set a flag to set the property only the first time. I don't like this way, but I don't know if there is a single shot event that could be used, or if this can be done otherwise. Any feedback based on your experience?

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  • Android Read contents of a URL (content missing after in result)

    - by josnidhin
    I have the following code that reads the content of a url public static String DownloadText(String url){ StringBuffer result = new StringBuffer(); try{ URL jsonUrl = new URL(url); InputStreamReader isr = new InputStreamReader(jsonUrl.openStream()); BufferedReader in = new BufferedReader(isr); String inputLine; while ((inputLine = in.readLine()) != null){ result.append(inputLine); } }catch(Exception ex){ result = new StringBuffer("TIMEOUT"); Log.e(Util.AppName, ex.toString()); } in.close(); isr.close(); return result.toString(); } The problem is I am missing content after 4065 characters in the result returned. Can someone help me solve this problem. Note: The url I am trying to read contains a json response so everything is in one line I think thats why I am having some content missing.

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  • jQuery ajax Data Sent to Controller are Empty only in IE

    - by saman gholami
    This is my jQuery code : $.ajax({ url: "/Ajax/GetConcertTime", type: "POST", cache: false, data: { concertID: concertID.replace("ct", ""), date: selectedDateValue }, success: function (dataFromServer) { //some codes ... }, error: function (a, b, c) { alert(c); } }); And this is my controller code for catching parameters : [HttpPost] public ActionResult GetConcertTime(string concertId, string date) { int cid = Convert.ToInt32(concertId); try { MelliConcertEntities db = new MelliConcertEntities(); var lst = (from x in db.Showtimes where x.Concert.ID == cid && x.ShowtimeDate.Equals(date) && x.IsActive == true select x.ShowtimeTime).Distinct().ToList(); JavaScriptSerializer js = new JavaScriptSerializer(); return Content(js.Serialize(lst)); } catch (Exception ex) { return Content(ex.Message); } } After debugging i know the parameters in Controller (concertId and date) are empty when i useing IE browser.but in other browser it's work properly. What should i do for this issue?

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  • How to convert ms access data into pdf in vb.net

    - by user225269
    I want to convert the ms access data into a document so that the print function in vb.net will read it. Where do I start from here? Here is my form: http://screencast.com/t/MGU4N2UyNmY And here is the code for print preview. Try PrintPreviewDialog1.ShowDialog() Catch es As Exception MessageBox.Show(es.Message) End Try How do I incorporate the above code, to the code below so that there is something that can be seen when I hit the print button? Dim cn As New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\search.mdb") Dim cmd As OleDbCommand = New OleDbCommand("Select * from GH where NAME= '" & TextBox6.Text & "' ", cn) cn.Open() Dim rdr As OleDbDataReader rdr = cmd.ExecuteReader If rdr.HasRows Then rdr.Read() NoAcc = rdr("NAME") If (TextBox6.Text = NoAcc) Then TextBox1.Text = rdr("IDNUMBER") If (TextBox6.Text = NoAcc) Then TextBox7.Text = rdr("DEPARTMENT") If (TextBox6.Text = NoAcc) Then TextBox8.Text = rdr("COURSE") End If Please help,thanks

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  • Is catching NumberFormatException a bad practice?

    - by integeruser
    I have to parse a String that can assume hex values or other non-hex values 0xff, 0x31 or A, PC, label, and so on. I use this code to divide the two cases: String input = readInput(); try { int hex = Integer.decode(input); // use hex ... } catch (NumberFormatException e) { // input is not a hex, continue parsing } Can this code be considered "ugly" or difficult to read? Are there other (maybe more elegant) solutions? EDIT : I want to clarify that (in my case) a wrong input doesn't exist: i just need to distinguish if it is a hex number, or not. And just for completeness, i'm making a simple assebler for DCPU-16.

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  • Not all Code Paths return a Value Issue

    - by jorame
    I have this peace of code in a class(DataBase) and I'm getting "Not all Paths return a Value". Any help will be really appreciated. public static DataSet DELETE_PDT(String rowid) { SqlConnection con = new SqlConnection(); SqlCommand cmd = new SqlCommand("sp_DELETE_PDT", con); cmd.CommandType = CommandType.StoredProcedure; cmd.Parameters.Add("@rowid", SqlDbType.Int).Value = rowid; con.ConnectionString = ConfigurationManager.ConnectionStrings["WMS"].ConnectionString; try { con.Open(); cmd.ExecuteNonQuery(); cmd.Dispose(); con.Close(); } catch (Exception ex) { throw new Exception("Error while deleting record. Please contact your System Administrator", ex); } }

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  • How to read the values returned by the Json?

    - by user281180
    I have the following code in my view: <% using (Ajax.BeginForm("JsonCreate", new AjaxOptions { OnComplete = "createCategoryComplete" })) { % Add new category <%=Html.TextBox("CategoryId")% <%=Html.TextBox("Test")% Name: <%= Html.TextBox("Name")% <%= Html.ValidationMessage("Name")% </p> <p> <input type="submit" value="Create" /> </p> </fieldset> </div> <% } % In the controller the code is as follows: [AcceptVerbs(HttpVerbs.Post)] public JsonResult JsonCreate(string Name) { if (ModelState.IsValid) { try { //Return a json object to the javascript return Json(new { CategoryId = 123, Test= "test successful" }); } catch { #region Log errors about the exception //Log error to administrator here #endregion } } //If we got this far, something failed, return an empty json object return Json(new { /* Empty object */ }); } What should be the code in the view for the following function to read the values returned by the Json and update the textboxes for CategoryId and Test? function createCategoryComplete() {....???}

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  • Error handling in controllers with MVC

    - by twrn
    Does it make sense to do error handling and logging inside actions methods or handle the OnException method inside the controllers. One way means writing try/catches in all the action methods even when there is nothing to be done to recover from the error. Handling this at the controller level would allow logging and redirection to an error handler page without writing try/catches inside all the action methods. Which method makes the most sense? Here is example code of try/catches in an action method. [HttpPost] public ActionResult Delete(int id) { using (new Tracer("Project Controller")) { try { Logger.Write("Deleting project"); projService.DeleteProject(id); TempData["message"] = "Project Deleted successfully"; } catch (System.Exception ex) { HandleException(ex, "Project could not be deleted."); } return RedirectToAction("List"); } }

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  • i try to combine GUI with class - no success

    - by Gold
    hi i made a class that make registration to my WinCE program. how i can from the class draw pannel + textbox, and catch the enter press from the textbox ? i try to do this: TextBox tb=new TextBox(); tb.Location=new Point(10,10); Panel pn=new Panel(); pn.Dock=DockStyle.Fill; pn.Controls.Add(tb); this.Controls.Add(pn); but i got error in: this.Controls.Add(pn); is there any simple sample code for this ? thank's in advance

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  • No exit option if something is running

    - by max
    How can I catch something going on if the user chooses the exit option from a menu? I mean I'd like to be able to manage the event of a user who is going to close the application but some activity is being performed so he/she shouldn't be able to exit. Here's the code I wrote. In a nutshell : recording is being performed -- user clicks exit -- WARNING "Process is running you can't do it"(The process goes on) nothing is running -- user clicks exit -- application closes Is it possible to solve the problem by just adding a few lines of code without having to rewrite the entire program? thanks very much in advance. MAX exitAction = new AbstractAction("Exit") { public void actionPerformed(ActionEvent e) { System.exit(0); } }; exitAction.putValue(Action.NAME, "Exit"); // description exitAction.putValue(Action.SHORT_DESCRIPTION, "Exit application");

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  • Running out of memory when getting a bitmap from a server?

    - by ikky
    Hi! I'm making an application which uses MANY images. The application gets the images from a server, and downloads them one at a time. After many images the creation of a bitmap returns an exception, but i don't know how to solve this. Here is my function for downloading the images: public static Bitmap getImageFromWholeURL(String sURL) { HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create(sURL); myRequest.Method = "GET"; // If it does not exist anything on the url, then return null try { HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse(); System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(myResponse.GetResponseStream()); myResponse.Close(); return bmp; } catch (Exception e) { return null; } } Can anyone help me out here? Thanks in advance!

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  • In Java, how do I set a return type if an exception occurs?

    - by beagleguy
    hey all, I'm new to Java and was wondering if I define a method to return a database object like import java.sql.*; public class DbConn { public Connection getConn() { Connection conn; try { Class.forName("com.mysql.jdbc.Driver").newInstance(); if(System.getenv("MY_ENVIRONMENT") == "development") { String hostname = "localhost"; String username = "root"; String password = "root"; } conn = DriverManager.getConnection("jdbc:mysql:///mydb", username, password); return conn; } catch(Exception e) { throw new Exception(e.getMessage()); } } } if the connection fails when I try to create it what should I return? eclipse is telling me I have to return a Connection object but if it fails I'm not sure what to do. thanks!

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  • Comparing textbox value to database

    - by simon
    HI ! I would like to compare values from a textbox with data from a table. I tried this code but i got the error that the input string was in the wrong format! code: string connectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=save.mdb"; try { database = new OleDbConnection(connectionString); database.Open(); string queryString = "SELECT zivila.naziv,users.user_name FROM (obroki_save " + " LEFT JOIN zivila ON zivila.ID=obroki_save.ID_zivila) " + " LEFT JOIN users ON users.ID=obroki_save.ID_uporabnika " + " WHERE users.ID='" +Convert.ToInt16(id.iDTextBox.Text)+"'"; loadDataGrid(queryString); } catch (Exception ex) { MessageBox.Show(ex.Message); return; }

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  • Pass array of models from view to controller

    - by niaher
    Is it possible to pass array of models from view to controller? How? Suppose my model is public class Car { public string Name { get; set; } public int Price { get; set; } } And I have a <form> where user can dynamically add new cars. When he submits, I want to catch it in the action method public ActionResult CreateCars(Car[] cars) Is it possible?

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  • An attempt to attach an auto-named database for file failed in Vb.Net

    - by user2454135
    I am Trying to connect database for first time , and I am getting this error : An attempt to attach an auto-named database for file VBTestDB.mdf failed. A database with the same name exists, or specified file cannot be opened, or it is located on UNC share. and getting error on myconnect.Open() Heres my code : Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Dim myconnect As New SqlClient.SqlConnection myconnect.ConnectionString = "Data Source=.\SQLEXPRESS;AttachDbFilename=VBTestDB.mdf;Integrated Security=True;User Instance=True;" Dim mycommand As SqlClient.SqlCommand = New SqlClient.SqlCommand() mycommand.Connection = myconnect mycommand.CommandText = "INSERT INTO Card (CardNo,Name) VALUES (@cardno,@name)" myconnect.Open() Try mycommand.Parameters.Add("@cardno", SqlDbType.Int).Value = TextBox1.Text mycommand.Parameters.Add("@name", SqlDbType.NVarChar).Value = TextBox2.Text mycommand.ExecuteNonQuery() MsgBox("Success") Catch ex As System.Data.SqlClient.SqlException MsgBox(ex.Message) End Try myconnect.Close() End Sub

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  • App crashing on open on Motorola Backflip only

    - by anakin78z
    I have recently published my second app on the Android Market. I've gotten a few e-mails about the app crashing on open, and all users were using the Motorola Backflip. It seems to work fine on all other devices. The app shows the background image, but crashes right after that. Is there something different I have to do when coding for that device? The strange thing is that it is very similar to my first app, which seems to work just fine for them. The major difference is that my second app is a paid app, and uses Android Licence Verification. My implementation should catch any license errors though, and I've tested this on my device. Users have uninstalled and reinstalled the app without success. I'm stumped. The other thing they're reporting is that the icon doesn't even show properly, but rather is a gear in a box, which makes me think that something goes awry very early in the installation process.

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  • Need help on how to setup package structure and project

    - by jax
    I am new to Java and am making a license generator. This is my current setup. com.example.licensegenerator.client (used by the client application) :LicenseLoader (no Main method) :LicenseDownloader (no Main method) com.example.licensegenerator.server.keys (used by the server) :ProductKeyGenerator(Main method) com.example.licensegenerator.server.license (used on the server also) :LicenseGenerator(Main method) com.example.licensegenerator.lib (Shared classes between client and server) :Contants (no main) Now I have a few questions. Is it OK to have multiple Main() methods in a single project? Will I be able to compile them to different .jar files? (In this case I need two different jars for the server) Is there a better way to setup the packages? And a totally unrelated question, with exceptions, is it better to handle them right then and there or throw them and let the main method catch them all (the program cannot recover if an error occurs)

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  • What is the best way to identify that a function returned and automatically do something with it?

    - by EpsilonVector
    I'm implementing user threads on a Linux 2.4 kernel (homework) and my threads are basically just functions running with their own execution context (for example: uthread_create(functionpointer, args)). I'm having a hard time figuring out how to catch the return value and have it ready to be returned when two threads join. I know where to get the value from (eax), but not how to identify that the function actually finished. There's something called atexit, but I've seen people advising against using it, so... what is the best way to discover that a function returned and do something about it?

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  • Java reflection field value in extends class

    - by Lukasz Wozniczka
    Hello i hava got problem with init value with java reflection. i have got simple class public class A extends B { private String name; } public class B { private String superName; } and also i have got simple function: public void createRandom(Class<T> clazz , List<String> classFields){ try { T object = clazz.newInstance(); for(String s : classFields){ clazz.getDeclaredField(s); } } catch(Exception e){ } } My function do other stuff but i have got problem because i have got error : java.lang.NoSuchFieldException: superName How can i set all class field also field from super Class using reflection ??

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  • isAlive problem..Help to understand how it works

    - by max
    I get this error: "non-static method isAlive() cannot be referenced from a static context" what's wrong with this code..please. I'd like to detect if the thread is alive... Any help in terms of code will be highly appreciated..thanks max class RecThread extends Thread { public void run() { recFile = new File("recorded_track.wav"); // Output file type AudioFileFormat.Type fileType = null; fileType = AudioFileFormat.Type.WAVE; // if rcOn =1 thread is alive int rcOn; try { // starts recording targetDataLine.open(audioFormat); targetDataLine.start(); AudioSystem.write(new AudioInputStream(targetDataLine), fileType, recFile); if (RecThread.isAlive() == true) { rcOn =1; } else { rcOn =0; } } catch (Exception e) { showException(e); } // update actions recAction.setEnabled(true); stopRecAction.setEnabled(false); } }

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  • Simulating python's With statement in java

    - by drozzy
    Is there something like Python with context manager in Java? For example say I want to do something like the following: getItem(itemID){ Connection c = C.getConnection(); c.open(); try{ Item i = c.query(itemID); }catch(ALLBunchOfErrors){ c.close(); } c.close(); return c; } where in python I just have: with( C.getConnection().open() as c): Item i = c.query(itemID); return i;

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  • Promoting letters in a string to the next letter in java

    - by CSD1988
    I'm having issues figuring out how to get my code to increment the string that is given by user input so that when a user chooses to replace a letter like z it would go to a, b to c ect. The catch is I have to do this without using boolean. I am supposed to get this by using arithmetics to get the promotion from z to a from the users input. Plus must be only lower case letters from a-z. Any help would be appreciated thanks.

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  • how can I "force" a branch upon the trunk, in the case I can't "reintegrate"?

    - by davka
    We created a branch from the trunk on which a major refactoring was done. Meanwhile, the trunk advanced a few revisions with some fixes. We don't want these changes on the branch, so we don't want to "catch-up" merge the trunk to the branch, because we don't want to mix the old and new code. But without this I can't reintegrate the branch back to the trunk. Is there a way to impose the branch on the trunk "as-is"? (an idea I considered is to undo ("reverse-merge") the trunk back to the revision where the branch started, and then it is safe to merge it on branch - nothing should happen. Then I can reintegrate. What do you think?) thanks!

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