36,051 Topics
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| | Hi all, I'm developing a simple RMI chat server. Im getting following exception when i execute Client. Server works well. java.lang.IllegalArgumentException: argument type mismatch at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:322) at sun.rmi.transport.Transport$1.run(Transport.java:177) at sun.rmi.transport.Transport$1.run(Transport.java:174) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.Transport.serviceCall(Transport.java:173) at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:553) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:808) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:667) …  |
| | Hey guys. I have two questions about my code(which has no errors but isnt giving the output i want)...Is it possible to have an if statement in my 3rd constructor? Also why is my output giving the filepath instead of outputting calcutations? Thanks for having a look public class order … |
| | I cant get this program working. Cant really sort out where i am wrong. The program works fine without the save/load object feature. Please help!! import java.io.*; class Account { String name ,accno; double bal; void withdraw(double amt) { System.out.print("Processing"); for(double pr = 0; pr<500000000; pr++); System.out.print("."); for(double pr = … |
| | I am creating a program that has multiple classes. The program draws various shapes on a gui and the program needs to be modified to incorperate a highlighting function if a shape is clicked on. I have done the coding but it is not drawing the circle and I am … |
| | how to connect a database from jsp to check username and password**** |
| | I'm trying to make a video store program that allows customers to search for videos and either buy or rent them. I have already made a class with 3 subclasses, VHS, DVD and VCD. for the meantime,When video objects are first put into the store, the status should be “IN”. … |
| | Hello, I'm building this app, which requires a Camera, but it is not working, it doesn't show anything except the design, here's teh code: Camera c = null; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.qrreaderscreen); SurfaceView v = (SurfaceView) findViewById(R.id.v); SurfaceHolder surface_holder = null; v = new SurfaceView(getApplicationContext()); if (surface_holder … |
| | Hi guys, Finally I've registered after being a very long visitor for this awesome community. I have this problem which consumed 2 days of my time trying to figure out how to solve it. And your help is needed guys. The problem says: Transfer elemenents from Stack1 to Stack2 , …  |
 | this is my code, from the book *Head First Java* ... class Echo { int count=0; void hello() { System.out.println("Helloooo....."); } } public class EchoTestDrive { public static void main(String[] args) { Echo e1 = new Echo(); Echo e2 = new Echo(); // output 10 //Echo e2 = e1; // … |
| | hi suggest me a good exam prepration guide for "Java EE 6 Java Persistence API Developer Certified Expert Exam" Exam Number: 1Z0-898 thanking you  |
| | I have created a simple client server chat program using socket. I used to run Client program and Server program separately in two eclipse and chat is done through console only. The logic is as below: System1Class (Server) | System2Class (Client) 1) SendThreadSys1 Class | 1) SendThreadSys2 Class 2) ReceivedThreadSys1 … |
| | public void Enqueue(int value){ node end = endList.next; end.next=null; endList.data=value; endList.next=end; endList=end; Here is my code for an Enqueue method but when I run it mylist.Enqueue(12); It gives me an error. Is something wrong with my method or am I testing it incorrectly? Thanks. |
| | So I am trying to make a tile map editor/reader to create and interact with maps like [this](http://www.codeproject.com/KB/game/Autotiles_Algorithm/TileMapExample.png) , so essnetially I am wondering what the best way to go about this would be. I have not done anyhting graphical in programming in a long time and yeah, I was …  |
 | Hello I want to be able to be on a page and have a favorite that points to http://localhost/export which is a web service. When I select that favorite, the current web page Im on should send all of its source code to the web service. The web service should … |
| | I want to align two text in same line first text should be in left side another one should be in right side of java swing textpane. so I have using style interface and Styleconstants class to align text but it couldn't worked. I have applied some other styles on … |
| | Hello friends, I have created three JComboBoxes. first two of them get list from string. However I select these two comboboxes, the third combobox automatically retrieve data of a particular column from my database. But in my code its only get data from first item which automatically seleted by setmodel … |
| | Hey, Im trying to write a chat program which should be able to run multiple clients using threads. But I seem to get this "java.io.StreamCorruptedException: invalid type code: 00" error the whole time. My server code: [CODE] import java.io.*; import java.net.*; public class Server{ ServerSocket serverSocket; Socket connection = null; … |
| | public class SendMessage { public static void main(String[] args) throws UnsupportedEncodingException { //String strMsg=java.net.URLEncoder.encode("This is API msg", "UTF-8"); callURL("https://api.mVaayoo.com/mvaayooapi/MessageCompose?user=user@gmail.com:1111&senderID=TEST SMS&receipientno=9999999999&dcs=0&msgtxt=msg&state=1"); } public static void callURL(String strURL){ System.out.println(" URL is :"+strURL); try{ URL obj = new URL(strURL); HttpURLConnection httpReq = (HttpURLConnection)obj.openConnection(); httpReq.setDoOutput(true); httpReq.setInstanceFollowRedirects(true); httpReq.setRequestMethod("GET"); String iStatus = httpReq.getResponseMessage(); System.out.println("iStatus: "+iStatus); } … |
 | Hi everybody, I really tried to do my assignment but I am lost . Any helping is very helpful , Thanks Write a program that will generate a set of 50 random integers in the range -20 to + 20. The program should display the following: a) The number of … |
 | Dear All, **Please first accept my humble respects unto all of you**. I am a masters pass out in computer science from a reputed university and I have pretty good knowledge of Java as i have studied and practiced first 6 chapters of Java OCJP by Bates(I am doing remaining … |
| | Hi, I am new to java and am facing this problem. I have to use a TextEditor to display a list of customers. The JAR for that Texteditor which i have to use is available at (http://code.google.com/p/jtexteditor/downloads/list). Below is my class in which i am trying to use it. I … |
| | Hi All, I am not very good with Java and have a project in which i have to use this API ( http://code.google.com/p/jtexteditor/ ) to simply initiate/draw a TextEditor and fill it with the array of data i have. Unfortunatelly, there is no wiki/document/example with this API and i have … |
| | Hi everyone, I'm in an entry level Java class and I'm supposed to be able to count the # of 7's within an integer. I've read the chapters and looked online for help but can't seem to figure it out. We just learned loops (do, while, for) and if statements … |
| | **I am having trouble understanding exactly what I am supposed to do with the following instructions.** a. Create a class named Pay that includes variables of type double that hold rate of pay per hour and withholding rate percent. Gross pay is computed as hours worked times rate of pay … |
| | im trying to display result from my sql statement. here my report looks like success = 12 fail = 7 how can i display all success data when i click success and all fail data when i click fail link.. any idea..? im using netbeans... |
| | i am make a 2d game in java. i have 3 class: Main.java, Player.java, Ground.java. problem i am having is how trying to make my player to jump. i want it so it jump fast, slow down at top, and come down fast on ground. so kind of like real … |
| | Hi there, I'm attemtping to write my own version of the java "headSet" function which steps through a given tree set and returns all elements that are less than the function argument. For example: headSet(30) called for a set such as: [2, 5, 7, 18, 22, 34, 50, 76] should … |
| | import java.io.*; import java.awt.*; import java.awt.event.*; import javax.swing.*; class work { // main method constructs the Frame window public static void main ( String[] args ) { CircleWindow application = new CircleWindow(); }// end of main method }// end of Line app class CircleWindow extends Frame { private int nSeconds … |
 | Hi, I've been searching all the internet for an answer for my problem, but none of the sites I've stumbled upon haven't given any results. So, I have a JList, held inside JSCrollPane, held inside JPanel inside JFrame. I have a MySQL database, and another block of code retrieves stuff … |
| | Display tag with strust2, tiles, export option to pdf, excel is not working in WAS7.Working perfectly in Jboss6.Below is error trace. |
| | public class GenericDemo<E extends GenericDemo> { E innerE; public E doStuff(E e, GenericDemo<E> e2) { //insert code here } public E getE() { return innerE; } } The options are: 1. return e 2. return e2.getE() 3. return e2 4. return e.getE() Option (1) and (2) compile fine. Option (3) …  |
| | Hi.. I have an XML file like this <?xml version="1.0" encoding="UTF-8"?> <player> <user> <username>destiya</username> <password>destiya</password> </user> <user> <username>dian</username> <password>dian</password> </user> </player> then I want to parse it with javascript and here is my javascript code : function loadXML(path) { var xhttp; xhttp = new XMLHttpRequest(); xhttp.open("GET", path, false); xhttp.send(); return … |
| | hi all,hope anyone can describe for me what is happining in this code,its about NaryTrees and am new with trees. public class NaryTree extends AbstractTree { protected Object key ; protected int degree ; protected NaryTree[ ] subtree ; public NaryTree(int degree){ key = null ; this.degree = degree ; … |
| | I am supposed to pass up my lab work a few weeks back..but i dont seem to get it rite.Pls help me see what is wrong with my code.....this is the question Write a class PlaneSeat that has the following features. Each PlaneSeat object should hold a seat identification number … |
| | Good Afternoon all, I'm working on a project for school, and we have a part where we want a combobox filled with data from a mysql database, tabel = sport. We can work out how to fill a normal combobox just with strings, but we can't find out how to … |
| | public void enqueue(Object obj) { if(count == size) throw new ContainerFullException(); else { array[rear] = obj; rear = (rear + 1) % size; count++; } } this is a code that add and object to a circular array.at the start the array is empty,rear=front=0. when we add the first element … |
| | Hello Daniweb Members, I am a beginner programmer and I have a problem, I am doing a PAT (Practical Assessment Task) for my school and I have come accross a huge problem, I'm trying to get a value from a selected combobox in Netbeans, (I am using the GUI builder), … |
| | Suppose I have a class with a constructor that takes in two strings is it okay to write the constructor this way? public class box{ private String s1; private String s2; public box(**String str1,String str2**){ s1=str1; s2=str2; } } Or can I just say public box(String str1,str2)? |
| | foo |-test |-xcom |-A.class |-B.java And two files: package xcom; public class A{} package xcom public class B extends A{} Given above directory structure where root dir is foo. Class B extends A. Question is: Which allows B.java to compile? The answer is: Set the current dir to *test* then … |
| | ` Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at finalprojectintersection.ProjectGUI.findbuttonActionPerformed(ProjectGUI.java:278) at finalprojectintersection.ProjectGUI.access$000(ProjectGUI.java:26) at finalprojectintersection.ProjectGUI$1.actionPerformed(ProjectGUI.java:133) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252) at java.awt.Component.processMouseEvent(Component.java:6505) at javax.swing.JComponent.processMouseEvent(JComponent.java:3321) at java.awt.Component.processEvent(Component.java:6270) at java.awt.Container.processEvent(Container.java:2229) at java.awt.Component.dispatchEventImpl(Component.java:4861) at java.awt.Container.dispatchEventImpl(Container.java:2287) at java.awt.Component.dispatchEvent(Component.java:4687) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422) at java.awt.Container.dispatchEventImpl(Container.java:2273) at java.awt.Window.dispatchEventImpl(Window.java:2719) at java.awt.Component.dispatchEvent(Component.java:4687) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:703) … |
| | I need help with the caesar cipher homework assignment, I am stuck and I do not know where to go in this problem. THis is the decoder which moves all the letters back three, but I do not know what is missing.. import java.io.*; import java.util.Scanner; public class AssignmentSix { … |
| | Can I get help writing a program for a 12 sided and 10 sided die and rolling snake eyes? |
| | call method from another class Hi , I'm almost done with my practice paper I have done with the first part and now I'm working in the second part I came to this question and I stopped and didn't know how to call method from another class here is the … |
 | Hi I want to be able to change the name of the JFrame I am working on. It is currently named SwimmingPoolVolumeCalculator. When I go the Company Tab and enter in a name, I want that name to be shown as the new Title of the JFrame. How can i … |
| | Are there any online resources to learn Java BCD ,if there are please send me some links. Thanks. |
| | How to add an integer no to a date so tat i can a new date foe ex: date=10/11/2012 no=5 newdate=15/10/2012 **Any body plz help to solve the problem** |
| | Hello, I would need some help/suggestions for my java project. it has to create object - "skrynka"="closet". Closet has Shelfs("poličky"). There should be for example Users = 3 cups(differenced by color). I need to move cup on shelf and than autocreate new cup on the "start" place. Problem is that … |
| | Inline Code Example Here import java.util.*; public class DiceGame { public static void main(String[] args){ Random myRand = new Random(); Scanner myScan = new Scanner(System.in); double money = 10.00; int temp2 = myRand.nextInt(6)+ 1; int temp3 = myRand.nextInt(6)+ 1; int roll = temp2 + temp3; int choice = 0; boolean …  |
| | Please let me know godds books for web development using Jsf,Spring,Hibernate I am beginner to learn these technologies...and i am currently working on web development using these technologies...so let me know the easy and best books to learn these technologies. Books should include complete core concepts in simplified way....please help … |
| | Hello I’m struggling in how to create simple pie chart (for dashboard). Since I’m new in jsp, and I have no basic how to connect the chart with database. Any idea or any solution. |
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