I forgot the Stack Trace(a part of it, which i think important to the problem is): java.lang.NullPointerException | at org.arcs.methcancerdb.model.CancerType.equals(CancerType.java:43) | at javax.faces.component.UISelectOne.matchValue(UISelectOne.java:185) | at javax.faces.component.UISelectOne.validateValue(UISelectOne.java:137) | at javax.faces.component.UIInput.validate(UIInput.java:867) | at javax.faces.component.UIInput.executeValidate(UIInput.java:1065) | at javax.faces.component.UIInput.processValidators(UIInput.java:666) | at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1030) | at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1030) | at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1030) | at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1030) | at javax.faces.component.UIForm.processValidators(UIForm.java:229) | at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1030) | at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:662) | at org.ajax4jsf.framework.ajax.AjaxViewRoot.access$201(AjaxViewRoot.java:53) | at org.ajax4jsf.framework.ajax.AjaxViewRoot$3.invokeRoot(AjaxViewRoot.java:315) | at org.ajax4jsf.framework.ajax.JsfOneOneInvoker.invokeOnRegionOrRoot(JsfOneOneInvoker.java:53) | at org.ajax4jsf.framework.ajax.AjaxContext.invokeOnRegionOrRoot(AjaxContext.java:191) | at org.ajax4jsf.framework.ajax.AjaxViewRoot.processValidators(AjaxViewRoot.java:329) |
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