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How to specify a controller in a GUI app?

Im doing a simple GUI project with java. Sometimes it notices my fxml file and can run normally, but after a while it chooses to ignore it, throwing the following message:
Exception in Application start method
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.launcher.LauncherHelper$FXHelper.main(Unknown Source)
Caused by: java.lang.RuntimeException: Exception in Application start method
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$1(LauncherImpl.java:182)
at java.lang.Thread.run(Unknown Source)
Caused by: javafx.fxml.LoadException: No controller specified.
/C:/Users/M%c3%a1t%c3%a9/Desktop/Workspace/KisallatNyilvantartoRendszer/target/classes/main/allatok.fxml:24
at javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2597)
at javafx.fxml.FXMLLoader.access$100(FXMLLoader.java:103)
at javafx.fxml.FXMLLoader$Element.getControllerMethodHandle(FXMLLoader.java:557)
at javafx.fxml.FXMLLoader$Element.processEventHandlerAttributes(FXMLLoader.java:599)
at javafx.fxml.FXMLLoader$ValueElement.processEndElement(FXMLLoader.java:770)
at javafx.fxml.FXMLLoader.processEndElement(FXMLLoader.java:2823)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2532)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2441)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3214)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097)
at main.Main.start(Main.java:18)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$8(LauncherImpl.java:863)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$7(PlatformImpl.java:326)
at com.sun.javafx.application.PlatformImpl.lambda$null$5(PlatformImpl.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$6(PlatformImpl.java:294)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$4(WinApplication.java:186)
... 1 more
Exception running application main.Main
My main looks like this(and the allatok.fxml file is located in the main package, next to the main.java):
package main;
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;
public class Main extends Application {
public static void main(String[] args) {
launch(args);
}
#Override
public void start(Stage primaryStage) throws Exception {
Parent load = FXMLLoader.load(getClass().getResource("allatok.fxml"));
Scene value = new Scene(load);
primaryStage.setScene(value);
primaryStage.setResizable(true);
primaryStage.setTitle("Kisallat Nyilvantarto Rendszer");
primaryStage.show();
}
}
Where should I put the fxml file, and how should I rename the path?

At your top most XML tag you can specify the Fully Qualified Class Name (FQCN) using the XML attribute fx:controller
Example: AnchorPane
<AnchorPane prefHeight="400.0" prefWidth="600.0"
xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1"
fx:controller="com.zigma.Controller">
The code for com.zigma.Controller
package com.zigma;
import java.net.URL;
import java.util.ResourceBundle;
import javafx.fxml.Initializable;
public class Controller implements Initializable{
#Override
public void initialize(URL url, ResourceBundle resourceBundle)
{
System.out.println("controller init");
}
}

RMI server ClassNotFoundException when client makes call

I am trying to make a simple RMI execution engine to run on my local machine so that other java programs can easily run code on a second processor. (In the future this will be expanded to allow more processors).
The server starts up just fine, and the client appears to locate the registry ok, but when it tries to call the execution engine (and passes it a parameter) it causes a ClassNotFoundException.
I recognize that this is similar to many other questions on stack overflow, but as far as I can tell, all the other ones have to do with the client not being able to download the server's classes rather than the server not being able to download the client's classes.
Here is my code (copied almost exactly from this sample code):
RMIServer eclipse project
ComputeEngine Interface:
package interfaces;
import java.io.Serializable;
import java.rmi.Remote;
import java.rmi.RemoteException;
public interface ComputeEngine_IF extends Remote {
/**
* #param task The task object specifying the computation to be performed
* #return
* #throws RemoteException
*/
<T extends Serializable> T compute(TaskWithoutInput<T> task) throws RemoteException;
}
TaskWithoutInput interface:
package interfaces;
import java.io.Serializable;
public interface TaskWithoutInput<T> extends Serializable {
public T compute();
}
ComputeEngine Class:
package server;
import interfaces.ComputeEngine_IF;
import interfaces.TaskWithoutInput;
import java.io.Serializable;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import java.rmi.server.UnicastRemoteObject;
public class ComputeEngine implements ComputeEngine_IF{
public ComputeEngine() {
super();
}
#Override
public <T extends Serializable> T compute(TaskWithoutInput<T> task) throws RemoteException {
return task.compute();
}
public static void main(String[] args) {
if(System.getSecurityManager() == null) {
System.setSecurityManager(new SecurityManager());
}
try {
String name = "Compute";
ComputeEngine_IF engine = new ComputeEngine();
ComputeEngine_IF stub = (ComputeEngine_IF) UnicastRemoteObject.exportObject(engine, 0);
Registry registry = LocateRegistry.createRegistry(1099);
registry.rebind(name, stub);
System.out.println("Registry bound!");
}
catch (Exception e) {
System.err.println("ComputeEngine exception:");
e.printStackTrace();
}
}
}
RMIClient eclipse project
GetAnswerTask class
package client;
import interfaces.TaskWithoutInput;
public class GetAnswerTask implements TaskWithoutInput<Integer> {
private static final long serialVersionUID = 1L;
#Override
public Integer compute() {
return Integer.valueOf(42);
}
}
Client class
package client;
import interfaces.ComputeEngine_IF;
import interfaces.TaskWithoutInput;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
public class RmiClientExample {
public static void main(String args[]) {
if(System.getSecurityManager() == null) {
System.setSecurityManager(new SecurityManager());
}
try {
String name = "Compute";
Registry registry = LocateRegistry.getRegistry("localhost");
ComputeEngine_IF comp = (ComputeEngine_IF) registry.lookup(name);
TaskWithoutInput<Integer> getAnswer = new GetAnswerTask();
Integer answer = comp.compute(getAnswer);
System.out.println("Answer: " + answer);
}
catch (Exception e) {
System.err.println("RmiClientExample exception:");
e.printStackTrace();
}
}
}
Both projects contain an identical security policy file (in RMIServer it is called server.policy and in RMIClient it is called client.policy)
grant {
permission java.security.AllPermission;
};
I will, of course, restrict the permissions more once I get this working.
Building/Running
Since the code is pretty close to something I copied out of an example, my guess is that the code is right, or at least close, but that my mistake is in compiling/running the code. The example wasn't written for eclipse, so I don't have exact instructions.
The first thing I did was use eclipse's jar export wizard to jar the interface package into Interfaces.jar which I just placed in my RMIServer folder.
Then I run ComputeEngine with the following defines:
-Djava.rmi.server.codebase=file:/c:/Users/nate/workspace/RMIServer/Interfaces.jar
-Djava.rmi.server.hostname=localhost
-Djava.security.policy=c:/Users/nate/workspace/RMIServer/src/server.policy
The compute engine seems to run just find and outputs the print statement in the code.
I then run the client with the defines:
-Djava.rmi.server.codebase=file:/c:/Users/nate/workspace/RMIClient/bin/
-Djava.security.policy=c:/Users/nate/workspace/RMIClient/src/client.policy
And I get the following error message:
RmiClientExample exception:
java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
java.lang.ClassNotFoundException: client.GetAnswerTask
at sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
at sun.rmi.transport.Transport$1.run(Unknown Source)
at sun.rmi.transport.Transport$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(Unknown Source)
at sun.rmi.transport.StreamRemoteCall.executeCall(Unknown Source)
at sun.rmi.server.UnicastRef.invoke(Unknown Source)
at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(Unknown Source)
at java.rmi.server.RemoteObjectInvocationHandler.invoke(Unknown Source)
at com.sun.proxy.$Proxy0.compute(Unknown Source)
at client.RmiClientExample.main(RmiClientExample.java:24)
Caused by: java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
java.lang.ClassNotFoundException: client.GetAnswerTask
at sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
at sun.rmi.transport.Transport$1.run(Unknown Source)
at sun.rmi.transport.Transport$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: client.GetAnswerTask
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.rmi.server.LoaderHandler$Loader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at sun.rmi.server.LoaderHandler.loadClassForName(Unknown Source)
at sun.rmi.server.LoaderHandler.loadClass(Unknown Source)
at sun.rmi.server.LoaderHandler.loadClass(Unknown Source)
at java.rmi.server.RMIClassLoader$2.loadClass(Unknown Source)
at java.rmi.server.RMIClassLoader.loadClass(Unknown Source)
at sun.rmi.server.MarshalInputStream.resolveClass(Unknown Source)
at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
at java.io.ObjectInputStream.readClassDesc(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
at sun.rmi.server.UnicastRef.unmarshalValue(Unknown Source)
at sun.rmi.server.UnicastServerRef.unmarshalParametersUnchecked(Unknown Source)
at sun.rmi.server.UnicastServerRef.unmarshalParameters(Unknown Source)
... 13 more
Any thoughts on what I might be doing wrong?

GetAnswerTask implements Serializable, so it will be serialized to the server when you call ComputeEngine_IF.compute(). So GetAnswerTask needs to be available at the server, on its classpath, and it isn't.

For those still struggling with oracle RMI tutorial, whose server doesn't download serializable class from given client's codebase (and stubbornly seeks class in its own codebase) - try to add
-Djava.rmi.server.useCodebaseOnly=false
to server's arguments

JavaFX FXML Slider to return integers instead of Doubles [duplicate]

I have this controller class for showing a database query in a TableView, but i am having error of NullPointerException with the "setCellValueFactory(new PropertyValueFactory"
package aplicativo;
import java.net.URL;
import java.util.ResourceBundle;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.TextField;
import javafx.scene.control.cell.PropertyValueFactory;
public class Controle implements Initializable{
#FXML
private TextField txtCampo,txtCampo2;
#FXML
private Button btAdicionar,btConsultar;
#FXML
private TableView<Pessoa> tabValues;
#FXML
private TableColumn<Pessoa, Integer> tbcCod;
private TableColumn<Pessoa, String>tbcNome;
ObservableList<Pessoa> List = FXCollections.observableArrayList();
#FXML
private void btAdd(){
insertBD a = new insertBD(txtCampo.getText());
consultaBD b = new consultaBD();
List = b.consultaTudo();
tabValues.setItems(List);
txtCampo.clear();
}
#FXML
private void btCons(){
String tx = txtCampo2.getText();
if(tx.isEmpty()){
}else{
consultaBD a = new consultaBD();
a.consultaParecido(tx, "nome");
txtCampo2.clear();
}
}
#Override
public void initialize(URL arg0, ResourceBundle arg1) {
// TODO Auto-generated method stub
tbcCod.setCellValueFactory(new PropertyValueFactory<Pessoa, Integer>("cod"));
tbcNome.setCellValueFactory(new PropertyValueFactory<Pessoa, String>("nome"));
tabValues.setItems(List);
tabValues.getColumns().addAll(tbcCod,tbcNome);
}
}
The NullPointerExcepetion:
Exception in Application start method
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(Unknown Source)
at com.sun.javafx.application.LauncherImpl.launchApplication(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.launcher.LauncherHelper$FXHelper.main(Unknown Source)
Caused by: java.lang.RuntimeException: Exception in Application start method
at com.sun.javafx.application.LauncherImpl.launchApplication1(Unknown Source)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$152(Unknown Source)
at com.sun.javafx.application.LauncherImpl$$Lambda$50/1645995473.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: javafx.fxml.LoadException:
/C:/Users/lucas/workspace/BDFX/bin/aplicativo/Tela.fxml
at javafx.fxml.FXMLLoader.constructLoadException(Unknown Source)
at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
at javafx.fxml.FXMLLoader.loadImpl(Unknown Source)
at javafx.fxml.FXMLLoader.load(Unknown Source)
at aplicativo.Main.start(Main.java:13)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$159(Unknown Source)
at com.sun.javafx.application.LauncherImpl$$Lambda$53/1031257736.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$172(Unknown Source)
at com.sun.javafx.application.PlatformImpl$$Lambda$45/186276003.run(Unknown Source)
at com.sun.javafx.application.PlatformImpl.lambda$null$170(Unknown Source)
at com.sun.javafx.application.PlatformImpl$$Lambda$48/1529876784.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.application.PlatformImpl.lambda$runLater$171(Unknown Source)
at com.sun.javafx.application.PlatformImpl$$Lambda$47/237061348.run(Unknown Source)
at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(Unknown Source)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$145(Unknown Source)
at com.sun.glass.ui.win.WinApplication$$Lambda$36/2117255219.run(Unknown Source)
... 1 more
Caused by: java.lang.NullPointerException
at aplicativo.Controle.initialize(Controle.java:52)
... 23 more
Exception running application aplicativo.Main
Any solution?

One of the instance fields in your controller is lacking an #FXML annotation. Since the field is private, the FXML loader is unable to inject the control reference into the field during loading. Here are your instance field declarations:
#FXML
private TextField txtCampo,txtCampo2;
#FXML
private Button btAdicionar,btConsultar;
#FXML
private TableView<Pessoa> tabValues;
#FXML
private TableColumn<Pessoa, Integer> tbcCod;
private TableColumn<Pessoa, String>tbcNome;
Notice that the last field, tbcNome, is not annotated. As a result, when your initialize method is called, the tbcNome field contains a null reference, resulting in the exception.
To fix your problem, all you may need to do is add the #FXML annotation to the instance field declaration for tbcNome.
You may have encouraged this error by adopting the habit of listing more than one variable in your type declarations, eg. private Button btAdicionar, btConsultar;. In my opinion, this is a bad habit that can encourage errors like this to happen. I would suggest that you try to adopt the coding style in which each instance field has its own type declaration statement.

How to resolve exception in thread “main” javax.naming.NameNotFoundException: not bound?

I'm trying to create a jms publisher/subscriber chat application in eclipse.
import java.util.Properties;
import javax.jms.JMSException;
import javax.jms.Message;
import javax.jms.MessageListener;
import javax.jms.TextMessage;
import javax.jms.Topic;
import javax.jms.TopicConnection;
import javax.jms.TopicConnectionFactory;
import javax.jms.TopicSession;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
public class TopicConsumer implements MessageListener {
public static void main(String[] args) throws JMSException, NamingException {
System.out.println(".....Entering JMS example TopicConsumer....");
Context context = TopicConsumer.getInitialContext();
TopicConnectionFactory topicConnectionFactory = (TopicConnectionFactory) context.lookup("ConnectionFactory");
Topic topic = (Topic) context.lookup("topic/zaneacademy_jms_tutorial_01");
TopicConnection topicConnection = topicConnectionFactory.createTopicConnection();
TopicSession topicSession = topicConnection.createTopicSession(false, TopicSession.AUTO_ACKNOWLEDGE);
topicSession.createSubscriber(topic).setMessageListener(new TopicConsumer());
topicConnection.start();
System.out.println("......Exiting JMS Example TopicConsumer.....");
}
public void onMessage(Message message) {
try {
System.out.println("Incoming Messages: " + ((TextMessage)message).getText());
} catch (JMSException e) {
e.printStackTrace();
}
}
public static Context getInitialContext() throws JMSException, NamingException {
Properties props = new Properties();
props.setProperty("java.naming.factory.initial", "org.jnp.interfaces.NamingContextFactory");
props.setProperty("java.naming.factory.url.pkgs", "org.jboss.naming");
props.setProperty("java.naming.provider.url", "localhost:1099");
Context context = new InitialContext(props);
return context;
}
}
trying to run the program I'm getting the following errors in console
.....Entering JMS example TopicConsumer....
Exception in thread "main" javax.naming.NameNotFoundException: zaneacademy_jms_tutorial_01 not bound
at org.jnp.server.NamingServer.getBinding(NamingServer.java:564)
at org.jnp.server.NamingServer.getBinding(NamingServer.java:572)
at org.jnp.server.NamingServer.getObject(NamingServer.java:578)
at org.jnp.server.NamingServer.lookup(NamingServer.java:317)
at org.jnp.server.NamingServer.lookup(NamingServer.java:291)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
at sun.rmi.transport.Transport$1.run(Unknown Source)
at sun.rmi.transport.Transport$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(Unknown Source)
at sun.rmi.transport.StreamRemoteCall.executeCall(Unknown Source)
at sun.rmi.server.UnicastRef.invoke(Unknown Source)
at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(Unknown Source)
at java.rmi.server.RemoteObjectInvocationHandler.invoke(Unknown Source)
at com.sun.proxy.$Proxy0.lookup(Unknown Source)
at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:669)
at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:629)
at javax.naming.InitialContext.lookup(Unknown Source)
at TopicConsumer.main(TopicConsumer.java:19)

As it says in the exception the zaneacademy_jms_tutorial_01 is not defined.
You need to configure it and assigne it to the topic/zaneacademy_jms_tutorial_01.
I would say, that the problem is your getInitialContext() which you configure mannaully, instead of returing the probably already configured context by new InitialContext();

Exception in thread "main" java.lang.NoClassDefFoundError: org/slf4j/LoggerFactory

package photo;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import com.github.sarxos.webcam.Webcam;
public class capture {
public static void main(String arg[]) throws IOException {
Webcam webcam = Webcam.getDefault();
webcam.open();
BufferedImage image = webcam.getImage();
ImageIO.write(image, "JPG", new File("test.jpg"));
}
}
I have written this java code to capture photo through webcam, but this code is throwing an error/exception please tell how can I fix it.?
Exception in thread "main" java.lang.NoClassDefFoundError: org/slf4j/LoggerFactory
at com.github.sarxos.webcam.Webcam.<clinit>(Webcam.java:97)
at photo.capture.main(capture.java:12)
Caused by: java.lang.ClassNotFoundException: org.slf4j.LoggerFactory
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 2 more

Download SLF4J and put the slf4j-api-1.7.2.jar file onto your class path.