Message d'erreur http500

Bonjour,
je souhaite passer commande mais au moment de mettre ds le panier un message d'erreur apparaîtTP 500 -

type Rapport d'exception

message

description Le serveur a rencontré une erreur interne () qui l'a empêché de satisfaire la requête.

exception

javax.servlet.ServletException: javax.faces.el.EvaluationException: Error getting property 'caracteristiques' from bean of type ApplicationMetier.ProduitController: java.lang.NullPointerException
javax.faces.webapp.FacesServlet.service(FacesServlet.java:209)
net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:304)
cause mère

javax.faces.el.EvaluationException: javax.faces.el.EvaluationException: Error getting property 'caracteristiques' from bean of type ApplicationMetier.ProduitController: java.lang.NullPointerException
com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:206)
com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:154)
javax.faces.component.UIData.getValue(UIData.java:527)
javax.faces.component.UIData.getDataModel(UIData.java:856)
javax.faces.component.UIData.setRowIndex(UIData.java:379)
javax.faces.component.UIData.iterate(UIData.java:898)
javax.faces.component.UIData.processDecodes(UIData.java:737)
javax.faces.component.UIForm.processDecodes(UIForm.java:144)
javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:880)
javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:880)
javax.faces.component.UIViewRoot.processDecodes(UIViewRoot.java:306)
com.sun.faces.lifecycle.ApplyRequestValuesPhase.execute(ApplyRequestValuesPhase.java:79)
com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:90)
javax.faces.webapp.FacesServlet.service(FacesServlet.java:197)
net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:304)
cause mère

javax.faces.el.EvaluationException: Error getting property 'caracteristiques' from bean of type ApplicationMetier.ProduitController: java.lang.NullPointerException
com.sun.faces.el.PropertyResolverImpl.getValue(PropertyResolverImpl.java:89)
com.sun.faces.el.impl.ArraySuffix.evaluate(ArraySuffix.java:167)
com.sun.faces.el.impl.ComplexValue.evaluate(ComplexValue.java:151)
com.sun.faces.el.impl.ExpressionEvaluatorImpl.evaluate(ExpressionEvaluatorImpl.java:243)
com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:173)
com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:154)
javax.faces.component.UIData.getValue(UIData.java:527)
javax.faces.component.UIData.getDataModel(UIData.java:856)
javax.faces.component.UIData.setRowIndex(UIData.java:379)
javax.faces.component.UIData.iterate(UIData.java:898)
javax.faces.component.UIData.processDecodes(UIData.java:737)
javax.faces.component.UIForm.processDecodes(UIForm.java:144)
javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:880)
javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:880)
javax.faces.component.UIViewRoot.processDecodes(UIViewRoot.java:306)
com.sun.faces.lifecycle.ApplyRequestValuesPhase.execute(ApplyRequestValuesPhase.java:79)
com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:90)
javax.faces.webapp.FacesServlet.service(FacesServlet.java:197)
net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:304)
cause mère

java.lang.NullPointerException
ApplicationMetier.ProduitController.getCaracteristiques(ProduitController.java:4041)
sun.reflect.GeneratedMethodAccessor527.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
com.sun.faces.el.PropertyResolverImpl.getValue(PropertyResolverImpl.java:79)
com.sun.faces.el.impl.ArraySuffix.evaluate(ArraySuffix.java:167)
com.sun.faces.el.impl.ComplexValue.evaluate(ComplexValue.java:151)
com.sun.faces.el.impl.ExpressionEvaluatorImpl.evaluate(ExpressionEvaluatorImpl.java:243)
com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:173)
com.sun.faces.el.ValueBindingImpl.getValue(ValueBindingImpl.java:154)
javax.faces.component.UIData.getValue(UIData.java:527)
javax.faces.component.UIData.getDataModel(UIData.java:856)
javax.faces.component.UIData.setRowIndex(UIData.java:379)
javax.faces.component.UIData.iterate(UIData.java:898)
javax.faces.component.UIData.processDecodes(UIData.java:737)
javax.faces.component.UIForm.processDecodes(UIForm.java:144)
javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:880)
javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:880)
javax.faces.component.UIViewRoot.processDecodes(UIViewRoot.java:306)
com.sun.faces.lifecycle.ApplyRequestValuesPhase.execute(ApplyRequestValuesPhase.java:79)
com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:200)
com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:90)
javax.faces.webapp.FacesServlet.service(FacesServlet.java:197)
net.bull.javamelody.MonitoringFilter.doFilter(MonitoringFilter.java:304)

merci de me répondre
cordialement
Sandrine