Not Resolving the classpath to a file

**vin_eets** · April 5th, 2011, 08:48 AM

I am using jChats(jCharts-0.7.5.jar) application with its included example for PieChart

If I provide the claspath to the jar file of charts ,it doesnt work,it gives me error that it is not finding particular class(in this case it is IPieChartDataSet)

But if I extract the jar file and place the "org" folder in the current directory,it works absolutely fine

It is also working fine with the Eclipse IDE

Can anyone tell me what is the problem

**keang** · April 5th, 2011, 11:33 AM

It sounds like your not providing the correct classpath value.

**vin_eets** · April 5th, 2011, 11:46 PM

I am providing the correct calss path i.e if it is E:\ directorty(jar file of jCharts)

I provide the classpath i.e is E:\jCharts-0.7.5.jar

**keang** · April 6th, 2011, 04:36 AM

You going to have to provide a lot more information if you want us to help you. For instance:

The full directory path to your code
The full directory path to the jar file
The command line you are using to try to start the application
The command line you used to start the application when you unpacked the jar

etc etc.

**vin_eets** · April 6th, 2011, 08:30 AM

I have uploaded an attachment.It contains

1>jCharts jar file

2>Source Code and compiled class

3> Html file to run an applet

You just need to

1>Set the classpath till jar and give a try and it wont work(as is mine case)

2>Keep the extracted "org" folder in current directory it will work

**keang** · April 6th, 2011, 11:24 AM

Sorry but I generally don't download attachments. Can you provide the information I asked for showing the html files used to start the applet.

**dlorde** · April 6th, 2011, 01:14 PM

Originally Posted by vin_eets

I am providing the correct calss path i.e if it is E:\ directorty(jar file of jCharts)

I provide the classpath i.e is E:\jCharts-0.7.5.jar

If the class is in the jar file (which it seems to be), but cannot be found, then the classpath is not correct. Simples

Teachers open the door, but you must enter by yourself...
Chinese proverb

**Ray Newman** · April 6th, 2011, 09:01 PM

Add "archive="jCharts-0.7.5.jar" to your applet tag.

(i.e., <html><body><applet code="SwingDemo.class" archive="jCharts-0.7.5.jar" width='350' height='300'></applet</body></html>)

Ray

**vin_eets** · April 6th, 2011, 11:57 PM

I am giving the source code and HTML file ,but you need to download the jCharts jar file to run the code

Source Code
____________

import org.jCharts.chartData.ChartDataException;
import org.jCharts.chartData.PieChartDataSet;
import org.jCharts.nonAxisChart.PieChart2D;
import org.jCharts.properties.*;
import org.jCharts.types.PieLabelType;

import javax.swing.*;

import java.awt.*;
import java.awt.event.WindowEvent;
import java.io.*;

public class SwingDemo extends JApplet
{

private JPanel panel;
PieChart2D pieChart2D;
JButton button;
Container con=getContentPane();
GridBagConstraints c = new GridBagConstraints();

public void init()
{
//getContentPane().add(new JButton("1"));

con.setLayout(new GridBagLayout());
GridBagConstraints c = new GridBagConstraints();
button = new JButton("BarChart");
c.fill = GridBagConstraints.HORIZONTAL;
c.ipady = 0; //reset to default
c.weighty = 1.0; //request any extra vertical space
c.anchor = GridBagConstraints.LINE_END; //bottom of space
c.insets = new Insets(10,0,0,0); //top padding
c.gridx = 1; //aligned with button 2
c.gridwidth = 2; //2 columns wide
c.gridy = 2; //third row

String[] labels={"PassedTest", "FailedTest", "SkippedTest"};
String title="Cars that Own";
Paint[] paints={Color.green, Color.red, Color.yellow};
double[] data={1000d, 100d, 5d};

try{

PieChart2DProperties pieChart2DProperties=new PieChart2DProperties();
pieChart2DProperties.setPieLabelType(PieLabelType.LEGEND_LABELS);
pieChart2DProperties.setPieLabelType( PieLabelType.VALUE_LABELS );

PieChartDataSet pieChartDataSet=new PieChartDataSet( title, data, labels, paints, pieChart2DProperties );

pieChart2D=new PieChart2D( pieChartDataSet, new LegendProperties(), new ChartProperties(), 300, 250 );
}catch(Exception e){}

}

public void paint(Graphics g){
try{

pieChart2D.setGraphics2D( (Graphics2D) this.getContentPane().getGraphics() );
pieChart2D.render();
con.add(button, c);
}catch(Exception e){}
}

}

HTML FILE
_________

<html><body><applet code="SwingDemo.class" width='350' height='300'></applet</body></html>

I use appletviewer "XXX".html where XXX is html file name or directly run the HTML file
I have also tried tunning apletviewer SwingDemo.java.It doesnt even work

"dlorde" :What classpath should I give if it is the problem of classpath because according to me ,I am providing correct classpath

* The full directory path to your code
My code and class file is in C:\ drive

* The full directory path to the jar file
Jar file is in E:\jChatrs thus I set the enviorment variable path to E:\jChatrs\jCharts-0.7.5.jar
* The command line you are using to try to start the application
I usually run the HTML file or appletviewer XXX.html

* The command line you used to start the application when you unpacked the jar
I usually run the HTML file or appletviewer XXX.htm

**dlorde** · April 7th, 2011, 04:34 AM

Originally Posted by vin_eets

"dlorde" :What classpath should I give if it is the problem of classpath because according to me ,I am providing correct classpath

You should provide the classpath to the jar file.

* The full directory path to the jar file
Jar file is in E:\jChatrs thus I set the enviorment variable path to E:\jChatrs\jCharts-0.7.5.jar

The environment variable 'path' is the OS executables directory list, not the Java application classpath, which is called 'classpath'.

However, the applet classpath is set using the 'archive' tag as Ray Newman explained previously.

You should be aware that for security reasons, applets are restricted in what they can do, and the applet's class loader can read only from the same codebase from which the applet was started.

This means that archives in archiveList must be in the same directory as, or in a subdirectory of, the codebase. Entries in archiveList of the form ../a/b.jar will not work unless explicitly allowed for in the security policy file (except in the case of an http codebase, where archives in archiveList must be from the same host as the codebase, but can have ".."'s in their paths.). See The Applet Tag.

For this reason, applets requiring additional libraries are usually packaged in a jar - see Running Jar-packaged Software.

You may find the Java Tutorial on Deploying Applets useful, particularly Deploying with the Applet tag.

The truth is, when all is said and done, one does not teach a subject, one teaches a student how to learn it. Teaching may look like administering a dose, but even a dose must be worked on by the body if it is to cure. Each individual must cure his or her own ignorance...
J. Barzun

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