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  • How to distribute java components for developers to use?

    - by coder
    I am not sure how to put the correct title. but here is the brief explanation. With Microsoft .NET, i created a server side custom control using C# to be used in ASP.NET pages. I distribute the DLL generated as a component. developers will include that and use in their ASP.NET project. Likewise, how can i do for Java based web components for to use with JSP or JSF or any other java web frameworks?

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  • How to pass a serialized object to appengine java task?

    - by aloo
    Hi all, I'm using java appengine and the task queue API to run async tasks. I would like to add a task to the task queue but pass a a java object as a parameter. I notic the task options api can add a parameter as a byte[] but I'm unsure how to use it. 1) How would I serialize my object to a byte[]? and 2) How would the task read the byte[] and reconstruct the original object? Thanks.

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  • Does Java have an equivalent to .NET resource (.resx) files for localization?

    - by frankadelic
    Does Java have an equivalent to .NET resource (.resx) files for localization? In .NET, you can define resources as key-value pairs within a standard XML document. The resource files are named according to the culture. For example: myresources.resx myresources.en-us.resx myresources.fr-fr.resx myresources.de-de.resx Is there an equivalent in Java? Are the similar naming conventions used for files?

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  • Are there reasons why the java/spring/hibernate stack aren't popular in the web 2.0 space?

    - by Blankman
    I am really impressed with the java/spring/hibernate stack, and really want to dive in. Just curious, why are so many people using rails when java/spring/hibernate are tried and true? I guesss its because of the convention over configuration and time to launch? (spring has really gone the annotation route so less xml though). I realize this is subjective, but just looking for some thoughts on this.

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  • Can I someone point to me what I did wrong? Trying to map VB to Java using JNA to access the library

    - by henry
    Original Working VB_Code Private Declare Function ConnectReader Lib "rfidhid.dll" () As Integer Private Declare Function DisconnectReader Lib "rfidhid.dll" () As Integer Private Declare Function SetAntenna Lib "rfidhid.dll" (ByVal mode As Integer) As Integer Private Declare Function Inventory Lib "rfidhid.dll" (ByRef tagdata As Byte, ByVal mode As Integer, ByRef taglen As Integer) As Integer Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load Dim desc As String desc = "1. Click ""Connect"" to talk to reader." & vbCr & vbCr desc &= "2. Click ""RF On"" to wake up the TAG." & vbCr & vbCr desc &= "3. Click ""Read Tag"" to get tag PCEPC." lblDesc.Text = desc End Sub Private Sub cmdConnect_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdConnect.Click If cmdConnect.Text = "Connect" Then If ConnectReader() Then cmdConnect.Text = "Disconnect" Else MsgBox("Unable to connect to RFID Reader. Please check reader connection.") End If Else If DisconnectReader() Then cmdConnect.Text = "Connect" End If End If End Sub Private Sub cmdRF_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdRF.Click If cmdRF.Text = "RF On" Then If SetAntenna(&HFF) Then cmdRF.Text = "RF Off" End If Else If SetAntenna(&H0) Then cmdRF.Text = "RF On" End If End If End Sub Private Sub cmdReadTag_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdReadTag.Click Dim tagdata(64) As Byte Dim taglen As Integer, cnt As Integer Dim pcepc As String pcepc = "" If Inventory(tagdata(0), 1, taglen) Then For cnt = 0 To taglen - 1 pcepc &= tagdata(cnt).ToString("X2") Next txtPCEPC.Text = pcepc Else txtPCEPC.Text = "ReadError" End If End Sub Java Code (Simplified) import com.sun.jna.Library; import com.sun.jna.Native; public class HelloWorld { public interface MyLibrary extends Library { public int ConnectReader(); public int SetAntenna (int mode); public int Inventory (byte tagdata, int mode, int taglen); } public static void main(String[] args) { MyLibrary lib = (MyLibrary) Native.loadLibrary("rfidhid", MyLibrary.class); System.out.println(lib.ConnectReader()); System.out.println(lib.SetAntenna(255)); byte[] tagdata = new byte[64]; int taglen = 0; int cnt; String pcepc; pcepc = ""; if (lib.Inventory(tagdata[0], 1, taglen) == 1) { for (cnt = 0; cnt < taglen; cnt++) pcepc += String.valueOf(tagdata[cnt]); } } } The error happens when lib.Inventory is run. lib.Inventory is used to get the tag from the RFID reader. If there is no tag, no error. The error code An unexpected error has been detected by Java Runtime Environment: EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x0b1d41ab, pid=5744, tid=4584 Java VM: Java HotSpot(TM) Client VM (11.2-b01 mixed mode windows-x86) Problematic frame: C [rfidhid.dll+0x141ab] An error report file with more information is saved as: C:\eclipse\workspace\FelmiReader\hs_err_pid5744.log

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  • Can I write an Android app in Java and convert it later?

    - by JT
    I've got a lot of experience in Java but none developing mobile apps. I'd like to write an application using Java/Swing and then convert it for use on an Android phone. Is this feasible or do I really need to develop from the ground up for the Android platform? I don't own an Android phone as I can't afford one at the moment, and the Android emulator is so slow that I find myself wasting a lot of time sitting around waiting.

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  • Is there a convention, when using Java RMI, to use the dollar sign $ in a variable name?

    - by Thomas Owens
    I realize that it is a valid part of a variable name, but I've never seen variable names actually use the symbol $ before. The Java tutorial says this: Additionally, the dollar sign character, by convention, is never used at all. You may find some situations where auto-generated names will contain the dollar sign, but your variable names should always avoid using it. However, since this is geared toward Java beginners, I'm wondering if in the distributed world, the $ lives on with a special meaning.

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  • What could be the Java successor Oracle wants to invest in?

    - by deamon
    I've read that Oracle wants to invest into another language than Java: "On the other hand, Oracle has been particularly supportive of alternative JVM languages. Adam Messinger ( http://www.linkedin.com/in/adammessinger ) was pretty blunt at the JVM Languages Summit this year about Java the language reaching it's logical end and how Oracle is looking for a 'higher level' language to 'put significant investment into.'" But what language could be the one Oracle wants to invest in? Is there another candidate than Scala?

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  • What should be the ideal number of parallel java threads for copying a large set of files from a qua

    - by ukgenie
    What should be the ideal number of parallel java threads for copying a large set of files from a quad core linux box to an external shared folder? I can see that with a single thread it is taking a hell lot of time to move the files one by one. Multiple threads is improving the copy performance, but I don't know what should be the exact number of threads. I am using Java executor service to create the thread pool.

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  • Is there an easy way to read an XML file in Java?

    - by user303135
    I'm fairly new to Java and am writing an app that needs an XML config file. The problem I have is that there doesn't seem to be any easy way to do this, which seems a bit strange. I've looked SAX and DOM and both seem quite complicated. Are there any other good API's out there? What's the best way to do this in Java? Thanks...

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  • Is .NET a write once, run anywhere (WORA) platform like Java claims to be?

    - by Scott Saad
    I remember Sun's slogan so vividly... "Write Once, Run Anywhere". The idea being that since programs are compiled into standard byte codes, any device with a Java Virtual Machine could run it. Over the years, Java seems to have made it onto many platforms/devices. Is this the intention or was it ever the intention of .NET. If so, what kind of efforts are being put forth to make this a reality?

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