Throwing error from backing bean on button click?

Question

Hi Everyone,
i have two lovs out of 2 lovs user has to select atleast one lov value and click on find button.
On clicking on find button im getting lov values if atleast one is not selected i need to throw one error message.
How can i throw error message?
Thanks.

Answer 1

Hi,
i used this code:
public String showMessage() {
System.out.println("inside error msg");
String messageText="Please select emp or ename";
FacesMessage fm = new FacesMessage(messageText);
* set the type of the message.
* Valid types: error, fatal,info,warning
//fm.setSeverity(FacesMessage.SEVERITY_INFO);
fm.setSeverity(FacesMessage.SEVERITY_ERROR);
FacesContext context = FacesContext.getCurrentInstance();
context.addMessage(null, fm);
System.out.println("end of error msg");
return null;
And called this method on clicking on find button in the method binding of the find button but it didnt show any error dialog bax rather it moved to the next page as usual.
Code in the find backing bean:
public String Find(){
if(Emp.equalsIgnoreCase("ALL") && EmpNo.equalsIgnoreCase("ALL")) {
String k=this.showMessage();
return "Find"; // to navigate to next page
what to do now?