Desperation and and misadventures with java.lang.NoClassDefFoundError

[RCruz]

Hi fellows! I'm in a bit of a pickle with using our dear POI, for I'm having this dastard error and I really can't identify why it's happening.
Would you guys mind helping me?

My SO is win7(x64) and I have the following libs included on my Eclipse IDE:

poi-3.9-20121203.jar
poi-ooxml-3.9-20121203.jar
poi-ooxml-schemas-3.9-20121203.jar
ooxml-lib\dom4j-1.6.1.jar
xmlbeans-2.3.0.jar

To which, as far as I'm aware, should be more than enough to run the following class:

public class Extracao 
{
	public void extrai(List<Noticia> passagem, String chave) throws FileNotFoundException, IOException
	{
		XWPFDocument doc = new XWPFDocument();
		XWPFParagraph paragrafo = doc.createParagraph();
		XWPFRun aplicacao = paragrafo.createRun();
		Noticia temporario;
		
		System.out.println("Ponto!" + passagem.size());
		
		while(!passagem.isEmpty())
		{
			temporario = passagem.remove(0);
			
			aplicacao.setText("Data : " + temporario.getData());
			aplicacao.addBreak();
			
			aplicacao = paragrafo.createRun();

			aplicacao.setText("Classe : " + temporario.getClasse() + "     Setor : " + temporario.getSetor());
			aplicacao.addBreak();
			
			aplicacao = paragrafo.createRun();
		
			aplicacao.setText("Tipo : " + temporario.tipoTexto() + "     Estado : " + temporario.getEstado());
			aplicacao.addBreak();
			
			aplicacao = paragrafo.createRun();
			
			divideTexto(doc,paragrafo, aplicacao, temporario.getNoticia());
			aplicacao.addBreak();
			aplicacao.addBreak();
			aplicacao.addBreak();
		}
		
		doc.write(new FileOutputStream(new File(chave + "\"" + "arquivoDeSaida.docx")));
	}
	
	private void divideTexto(XWPFDocument documento, XWPFParagraph paragrafo, XWPFRun app, String alvo)
	{	
		if(alvo.length() > 50)
		{
			int j, limite = 0;
			
			for(j = 0; j <= alvo.length(); j += 50)
			{
				app.setText(alvo.substring(j, j + 50));
				app.addBreak();
				
				app = paragrafo.createRun();
				limite = j;
			}
			
			if(limite != alvo.length())
			{
				app.setText(alvo.substring(j - 50, alvo.length()));
				app.addBreak();
			}
		}
		else app.setText(alvo);
		
		app.addBreak();
	}
}

The following error :

WARNING: StandardWrapperValve[Faces Servlet]: PWC1406: Servlet.service() for servlet Faces Servlet threw exception
javax.faces.el.EvaluationException: java.lang.NoClassDefFoundError: org/apache/poi/xwpf/usermodel/XWPFDocument
	at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102)
	at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)

is thrown when running the line 18 or, in the current case, the declaration of doc (XWPFDocument doc = ...).

I really am totally lost here guys, please help this lad here: why is the error being thrown? How do I fix it?

[Tolls]

Where is this running?
Looks like a server...so have a look in WEB-INF/lib and see whether those libraries are being deployed.
If not then you'll have to look into how the deployment is being determined.

[RCruz]

Issue solved, I copied all the jars to lib and, after some refreshs our good lad Eclipse found them!

Thank you very much Tolls, you helped me get on track for my research!