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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