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Cewolf DataProducer Error while compiling

Mazhar Ismail

Joined: Sep 10, 2008
Posts: 11

I have installed cewolf on Tomcat6.0 and the examples are running fine. I have written a example dataproducer java file mentioned below.

package de.laures.cewolf.example;

import java.util.*;

//import org.apache.common.*;

import de.laures.cewolf.*;

public class SimpleDataProvider implements DatasetProducer, Serializable{
public String getProducerId(){
return "de.laures.cewolf.example.simpledata";
public boolean hasExpired(Map arg0, Date arg1){
return false;
public Object produceDataSet(Map arg0) throws DatasetProduceException{
DefaultCategoryDataset dataset=new DefaultCategoryDataset();
for (int i=1;i<=10;i++){
dataset.addValue(i*1,"first series",new Integer(i));
return dataset;

I am getting 2 compilation errors when i am trying to compile this file. I think it is not able to find the DatasetProducer interface and DatasetProduceException class.

I work on windows. My cewolfexamples are in "C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\cewolfexample-1.0\WEB-INF". The WEB-INF has all the required directories and files cause I am able to run the example application. I have written this java file in "c:\java" directory and trying to compile it from there. Please tell me if I have to specify any classpath if so what should be the classpath and how do I set it.

Ulf Dittmer

Joined: Mar 22, 2005
Posts: 42952
Welcome to JavaRanch.

What command are you using for compilation? How are you adding the cewolf jar file to the classpath?
Ulf Dittmer

Joined: Mar 22, 2005
Posts: 42952
Please UseTheForumNotEmail, and if you use PMs, make sure you allow people to send them to you.

When you compile, make sure you have all required jar files (cewolf, jfreechart and jcommon) in the classpath.
I agree. Here's the link:
subject: Cewolf DataProducer Error while compiling