Running Hello World Application
Apr 1, 2014
I have a problem with running my hello world aplication. Here is the code.
public class HelloWorld {
public static void mаin(String[] args) {
System.out.println("Hello world!");
}
}
It compiles fine. But I get an exception when I try to run it.Here is the error message I'm getting:
Exception in thread "main" java.lang.NoSuchMethodException: HelloWorld.main([Ljava.lang.String;)
at java.lang.Class.getMethod(Class.java:1605)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:113)
Process finished with exit code 1
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Apr 15, 2015
I am integrating Struts hibernate tiles and spring configuration project. While running give me exception as
Apr 15, 2015 7:16:10 PM org.apache.catalina.core.AprLifecycleListener init
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:Program FilesJavajre1.8.0_40in;C:WindowsSunJavain;C:Windowssystem32;C:Windows;C:/Program Files/Java/jre1.8.0_40/bin/server;C:/Program Files/Java/jre1.8.0_40/bin;C:/Program Files/Java/jre1.8.0_40/lib/amd64;C:ProgramDataOracleJavajavapath;C:Program Files (x86)NVIDIA CorporationPhysXCommon;C:Program Files (x86)InteliCLS Client;C:Program FilesInteliCLS Client;C:Windowssystem32;C:Windows;C:WindowsSystem32Wbem;C:WindowsSystem32WindowsPowerShellv1.0;C:Program FilesMySQLMySQL Server
[code]....
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Jun 22, 2012
I'm facing some problem in my EJB setup. I have deployed the ejb setup and it was working fine.
The working conditions are:
1. The timer service is working when i hitted the servlet after starting the server. It must not work when i close the servlet window,but in my case it is still working(timer is performing its opeartion) even i closed the servlet page.
2. When i stopped the server, the timer not gets invoked.
I uninstalled the EJB application, but still the timer service is running.
I'm using WAS 7 server.
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Jul 1, 2014
I have to store data I've pulled from the web i wanted to do this by storing it in a database but after looking at some tutorials i'm not sure if its possible as the databases don't seem to run with the application but instead run as an independent entity.if its possible to have a database in the java application so it runs when the application runs.
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Jun 18, 2014
I have a java application which uses Google Maps to analyze the traffic condition. But sometimes it can be run and work properly, sometimes not. On some computers on which there is installed java, the program can be run, and on some, again with installed java (jre), exactly the same version, the program can not be run. For example the application first run well on my desktop computer, connected in a LAN, and then stopped working well when run. But when I use laptop which uses the WiFi and run the same computer using VMWare, if I connect to the desktop on which the program can not be run, on the laptop the same program can be run well, in the same room, but using the Wifi.
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Apr 15, 2011
At our company we run a third-party Java-based GUI application on one of our Linux server machine, displaying the application to our local Windows work stations using the Cygwin X Server.We noticed a few problems with a new version of this application and was able to narrow it down to the following conditions:
1. Java Swing application running on a UNIX host;
2. Java used is 1.6 (problem not noticed when using Java 1.5)
3. Displaying to Cygwin X server (I've heard other windows-based X servers have the same issue, but I don't have access to any others at this time).
If we run the application natively on Windows, I'm told if the application runs on the Linux host and displays natively to that machine's display there are no problems (although I'm not able to verify this myself).The problems are:
1. Any new frame/dialog is opened in the geographic center of the dual displays, rather than in the middle of one or the other;
2. Any attempt to drag the window to a different location on the display seems to work, but as soon as you let go of the drag, the window snaps back to the original location. This only happens the first time you try to move each window.
3. Drop-down controls (JComboBox, for example) just close back up as soon as you click on them. If you click and drag the mouse to attempt to make a selection, no selection can be made.
Are these known problems using 1.6 on UNIX displaying to Windows-based X Servers?
The only real problem is number 3. I expect that if I put more work into the window placement, I should be able to get past number 1. Number 2 is just a minor annoyance.The following is a simple Java Swing application which when run in the correct environment will exhibit the problems.
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
[code]....
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Jun 23, 2014
I am trying to put together an encryption/decryption application that will essentially accept a sentence that is submitted, and spit out the encrypted version and then switch it back to the correct sentence. I have been told to nest my information in the class (rather than the main), but am having difficulty actually understanding how to do this. The error that Eclipse is throwing me is also that it "could not find the main class." Here is my code:
import java.util.Arrays;
import java.util.Random;
public class encryptingWords {
public static void main(String[] args) {
final int ALPHASIZE = 26;
final char[] Lalpha =
[Code] .....
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Oct 17, 2014
I'm pretty new at java and I was wondering on how to get all my methods on one world frame?
The code is this:
public class TurtleTester
{
public static void main (String[] args)
{
World world= new World();
Turtle turtle= new Turtle(world);
turtle.drawRectangle(50,100);
turtle.drawHexagon(100);
[Code]...
When I run the main method, it would give me a bunch of world frames with one method in each one. I'm using BlueJ btw.
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Oct 7, 2014
I am trying to create a virus simulation program. The program is supposed to just be a map of the world where the user can click any country in the world to specify where they want their virus to start, specify how transmittable the virus is, and be able to see how the virus spreads through the world by seeing a change in color throughout the world,
I want the world map to initially start out with a very light yellow, and as areas of the world slowly start to get more and more infected by the virus, I want those areas on the map to start changing to a very dark red (going from a light yellow, through shades of orange and red, to dark red).
So, the main idea of this is to have a program that displays an image where certain parts of the image will slowly change color during the runtime of the program. I obviously know how to change colors of certain parts of a window or even an image, and how to even start this.
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Jun 7, 2014
I just created a Hello World program in Notepad, but command prompt still can't find it even when ran as administrator. I've even tried to use command line to run Hello World programs I've created with Eclipse but it still doesn't work. Here's proof I have JDK setup as PATH:
I've even tried having the JRE as path but that still doesn't solve my problem. I'm really trying to learn Java programming but this problem is holding me back.
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May 19, 2014
This is my program: RemoteXMLRead.java
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.DocumentBuilder;
import org.apache.commons.io.filefilter.WildcardFileFilte r;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.dom.Node;
import org.w3c.dom.Element;
import java.io.File;
[code]....
It is working fine when i run in Eclipse, but is giving error when i run in cmd.. What i need to do to over come this..
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Oct 7, 2014
I am trying to create a virus simulation program. The program is supposed to just be a map of the world where the user can click any country in the world to specify where they want their virus to start, specify how transmittable the virus is, and be able to see how the virus spreads through the world by seeing a change in color throughout the world,
I want the world map to initially start out with a very light yellow, and as areas of the world slowly start to get more and more infected by the virus, I want those areas on the map to start changing to a very dark red (going from a light yellow, through shades of orange and red, to dark red).
So, the main idea of this is to have a program that displays an image where certain parts of the image will slowly change color during the runtime of the program. I obviously know how to change colors of certain parts of a window or even an image, but this is very very detailed and advanced but how to even start this.
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Nov 17, 2014
convert or move standalone java thread application into Tomcat server container for accessing its JNDI services? Also is it possible to schedule this thread application in Tomcat server? is it possible to keep this app in tomcat as web application and schedule in window's scheduler.
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Mar 11, 2014
I am new to work on JNLP program. I have created a SWING program, JNLP file when i deploy the ear file i am getting 404 error. Please find the steps in details.
1.Created a dynamic web project JWStartProject in eclipse
2.Create a HelloWorld.java class under default package.
import javax.swing.*;
public class HelloWorld extends JFrame {
private static final long serialVersionUID = 4968624166243565348L;
private JLabel label = new JLabel("Hello Java Web START!");
public HelloWorld() {
super("Jave Web Start Example");
this.setSize(350, 200);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE );
this.setLayout(null);
[Code] ....
Now I exported this project as JWStartProject.war contains following code.
Created Server in Websphere Admin console
Deployed this war file under the server and started.
I have added MIME types also.
I am unable to launch the application. I am getting 404 errors. May I know where I went wrong?
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May 3, 2015
This is a program that prompts a menu using the do-while iteration. If user input is not valid, the menu should be reprompted once. But when I run the code and enter an invalid value, the menu is prompted 3 times.
class Menu {
public static void main(String args[])
throws java.io.IOException {
char choice;
do {
[code]....
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Jun 11, 2014
I just wrote a java program with eclipse that has to read many-many inputs from the user. I want to test it, but I really don't want to type it everytime again and again...
Can I just write all inputs in a text file and let eclipse read this file so instead of typing it again and again, Eclipse reads every line whenever it waits for a user input?
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Feb 17, 2014
I have a directories in UNIX:
/home/t_bmf/Java/HelloWorld/src/helloworld :will contain a .java file
/home/t_bmf/Java/HelloWorld/bin :will contain all .class file
Let say a have a code:
package helloworld;
public class HelloWorld {
public static void main(String[] arg) {
System.out.println("Hello World");
}
}
a command to compile this even outside the directory /home/t_bmf/Java/HelloWorld/src/helloworld
javac -d /home/t_bmf/Java/HelloWorld/bin /home/t_bmf/Java/HelloWorld/src/helloworld/HelloWorld.java
This will generate a directory /home/t_bmf/Java/HelloWorld/bin/helloworld and file inside this is HelloWorld.class
To run this program I must be in directory /home/t_bmf/Java/HelloWorld/bin and using this command:
java helloworld.HelloWorld
Question:
I already how to run the HelloWorld.class, but I must be in helloworld /home/t_bmf/Java/HelloWorld/bin to run it. Is there's a way to run the class even when I am not in directory /home/t_bmf/Java/HelloWorld/bin? Let's say I'm in /home/t_bmf, can I still run the HelloWorld.class?
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Jun 11, 2014
I've got a problem with my home made game. When I created it as a JFrame application it runs smoothly, but when I tried to convert it to a JApplet the graphic is "lagging". I can see the graphics blinking/flashing .....
Here is the code:
public class FallingBalls extends JApplet implements KeyListener,
ActionListener {
// VARIABLES //
boolean gameOver;
boolean win;
// Buttons
JButton start, pause, restart;
// Character "The Runner" (32px x 32 px)
[code]....
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Nov 23, 2014
I'm getting back into the swing of things with Java after using I'm asked to utilize a simple GUI in order to take in the starting data, I cannot seem to get this to work. I'm getting this error Exception in thread "main" java.lang.NullPointerException
at java.awt.Container.addImpl(Unknown Source)
at java.awt.Container.add(Unknown Source)
at Input.buildPanel(Input.java:53)
at Input.<init>(Input.java:27)
at InputDemo.main(InputDemo.java:5)
I've created two classes
import javax.swing.*;
public class Input extends JFrame {
private JPanel panel;
private JLabel messageLabel;
private JLabel messageLabel1;
private JLabel messageLabel2;
private JTextField shiftHrs;
[code]....
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Nov 6, 2014
We've got a java web app (running on a Solaris machine with Weblogic) and from time to time it stops working due to this error:
Java Code: java.net.SocketException: Too many open files mh_sh_highlight_all('java');
For what I've read we are somehow exceeding the established limit of file descriptors, and it seems that this may be caused for many reasons, not only open files that we forgot to close.
I am making a list of everything that may consume a file descriptor in the system mentioned above, so I can start reanalyzing the app... if needed, as I don't know if we're wasting them or if the limit is just insufficient.
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Mar 30, 2014
I've been playing around with this for about an hour.
Java Code:
Runtime runTime = Runtime.getRuntime();
try {
Process process = runTime.exec("notepad");
} catch (IOException e) {
e.printStackTrace();
} mh_sh_highlight_all('java');
So that works. Notepad will open.
However, I'm trying to get other programs to open. Specifically, this program: C:Octave3.2.4_gcc-4.4.0inoctave-3.2.4.exe...However, using that in place of notepad doesn't work. I'm assuming that there is some sort of system variable that explains why simply typing "notepad" works? As if you type notepad into the run box, notepad will open. Soo does that snippet work by going through some sort of system variables?How would I go about opening other programs, such as the one I referenced above.
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Jun 8, 2014
Tried to run ServiceServerImpl.class with rmic and got this error. Below is the command prompt text pasting.
"C:Program FilesJavajdk1.7.0_21in>rmic.exe ServiceServerImpl
error: File .ServiceServerImpl.class does not contain type ServiceServerImpl as expected, but type serviceserver.ServiceServerImpl. Please remove the file, or make sure it appears in the correct subdirectory of the class path.
error: Class ServiceServerImpl not found.
2 errors "
Here is the source code of the class file. Using Windows 8. I copied the .class file to the rmic.exe 's location later. didn't work either way. It is in a package called "serviceserver"
package serviceserver;
import java.rmi.*;
import java.rmi.server.*;
import java.util.*;
public class ServiceServerImpl extends UnicastRemoteObject implements ServiceServer
{
HashMap serviceList;
[Code] ....
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Feb 11, 2014
i have a program in UNIX directory /home/me/java/src
package bin;
public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello World");
}
}
I have manage to compile it successfully(class file will be in bin directory) using command below: javac -d /home/t_bmf/java/bin HelloWorld.java
My problem now is how would I execute the class in bin directory in UNIX? I already tried different ways on how to execute it as suggested in my internet research The one I tried is this:
java $CLASSPATH:.:bin/HelloWorld
but I got this error message:
Exception in thread "main" java.lang.NoClassDefFoundError: :/:bin/HelloWorld
Caused by: java.lang.ClassNotFoundException: :.:bin.HelloWorld
[code]....
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Feb 15, 2014
The while loop keeps running although I type quit. What is wrong with this code?
import java.util.*;
public class OddEvenGame {
public static void main(String[] args) {
Scanner console = new Scanner(System.in);
Random r = new Random();
]Code] ....
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Feb 24, 2015
The below method shows that a JOptionPane should display when the result is null, meaning it has not found what I was trying to look for. However only the if statement that finds the query runs:
public void find(Person person) {
String query = "SELECT * from employee WHERE last LIKE'" + lastName
+ "'";
try {
statement = connection.createStatement();
resultSet = statement.executeQuery(query);
[Code] ....
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Apr 16, 2015
I am working on a management gui for a program. I have implemented the start server button. But now I need to get something working so that when I press stop server the javaw.exe process which is running the the other jar file is stopped and ended.
The gui is going to be using a javaw.exe as well and I don't want to end the entire thing.
I just want to end the javaw.exe process that is running the other jar file.
This is my code for starting it:
JButton btnNewButton_2 = new JButton("Start Server");
btnNewButton_2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Runtime rt = Runtime.getRuntime();
try {
Process pr = rt.exec("java -jar DEDServer_release.jar");
[Code] ....
I just need to figure out what to do to stop it now.
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