jsf validate two fields in one time [duplicate]

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Best what you can do is to grab the other UIInput component by UIViewRoot#findComponent() inside the validate() method and then determine the submitted value by either UIInput#getSubmittedValue() (when it occurs after the currently validated component in the component tree) or UIInput#getValue() (when it occurs before the current component and thus is already validated).

E.g.

public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException {
    UIInput otherInput = (UIInput) context.getViewRoot().findComponent("clientId");
    String otherValue = (String) otherInput.getSubmittedValue();
    // ...
}

See also:

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