Erro com JasperReport [Resolvido]

Pessoal, alguem pode me dizer o que tem de errado nesta linha?

JasperPrint print = JasperFillManager.fillReport(relatorioJasper, null, ds);

public String geraRelatorio() {
		String jasper = "/br/com/projetobase/report/relatorioDeUsuarios.jasper";
		List<Usuario> usuarios = listaUsuarios();
		InputStream relatorioJasper = getClass().getResourceAsStream(jasper);
		JRBeanCollectionDataSource ds = new JRBeanCollectionDataSource(usuarios);
		try {
			JasperPrint print = JasperFillManager.fillReport(relatorioJasper, null, ds);
			System.out.println("\n\n\n Jasper Print: "+ print +"\n\n\n");
			
			//JasperExportManager.exportReportToPdf(jasperPrint)
			preenchePdf(print);
		} catch (JRException e) {
			e.printStackTrace();
		}
		return saida;
	}

Segue o erro:

net.sf.jasperreports.engine.JRException: Error retrieving field value from bean : usuario_id_usuario at net.sf.jasperreports.engine.data.JRAbstractBeanDataSource.getBeanProp erty(JRAbstractBeanDataSource.java:127) at net.sf.jasperreports.engine.data.JRAbstractBeanDataSource.getFieldVal ue(JRAbstractBeanDataSource.java:100) at net.sf.jasperreports.engine.data.JRBeanCollectionDataSource.getFieldV alue(JRBeanCollectionDataSource.java:104) at net.sf.jasperreports.engine.fill.JRFillDataset.setOldValues(JRFillDat aset.java:787) at net.sf.jasperreports.engine.fill.JRFillDataset.next(JRFillDataset.jav a:751) at net.sf.jasperreports.engine.fill.JRBaseFiller.next(JRBaseFiller.java: 1422) at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReport(JRVertic alFiller.java:111) at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java: 879) at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java: 801) at net.sf.jasperreports.engine.fill.JRFiller.fillReport(JRFiller.java:89 ) at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillMa nager.java:601) at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillMa nager.java:582) at br.com.projetobase.report.RelatorioUsuario.geraRelatorio(RelatorioUsu ario.java:47) at br.com.projetobase.bean.UsuarioBean.relatorioGeral(UsuarioBean.java:3 35) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl. java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces sorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at com.sun.el.parser.AstValue.invoke(AstValue.java:187) at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:297)

at com.sun.facelets.el.TagMethodExpression.invoke(TagMethodExpression.ja
va:68)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(Met
hodBindingMethodExpressionAdapter.java:77)
at org.apache.myfaces.application.ActionListenerImpl.processAction(Actio
nListenerImpl.java:57)
at javax.faces.component.UICommand.broadcast(UICommand.java:383)
at org.ajax4jsf.component.AjaxViewRoot.processEvents(AjaxViewRoot.java:3
21)
at org.ajax4jsf.component.AjaxViewRoot.broadcastEvents(AjaxViewRoot.java
:296)
at org.ajax4jsf.component.AjaxViewRoot.processPhase(AjaxViewRoot.java:25
3)
at org.ajax4jsf.component.AjaxViewRoot.processApplication(AjaxViewRoot.j
ava:466)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicat
ionPhase.java:97)
at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:266)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:132)

at javax.faces.webapp.FacesServlet.service(FacesServlet.java:244)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487
)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(Servlet
Handler.java:1093)
at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:178)

at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFil
ter.java:390)
at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:517)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(Servlet
Handler.java:1084)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:3
60)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.jav
a:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:1
81)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:7
26)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)

at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHand
lerCollection.java:206)
at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.
java:114)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:1
52)
at org.mortbay.jetty.Server.handle(Server.java:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:50
5)
at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnectio
n.java:843)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:648)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.ja
va:395)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.j
ava:488)
Caused by: java.lang.NoSuchMethodException: Unknown property 'usuario_id_usuario
'
at org.apache.commons.beanutils.PropertyUtils.getSimpleProperty(Property
Utils.java:1175)
at org.apache.commons.beanutils.PropertyUtils.getNestedProperty(Property
Utils.java:772)
at org.apache.commons.beanutils.PropertyUtils.getProperty(PropertyUtils.
java:801)
at net.sf.jasperreports.engine.data.JRAbstractBeanDataSource.getBeanProp
erty(JRAbstractBeanDataSource.java:115)
... 54 more

Grato!