javax.faces.validator

Class MethodExpressionValidator

Contents

    • Constructor Detail

      • MethodExpressionValidator

        public MethodExpressionValidator()

    • Method Detail

      • validate

        public void validate(FacesContext context,
                     UIComponent component,
                     Object value)
              throws ValidatorException
        Description copied from interface: Validator

        Perform the correctness checks implemented by this Validator against the specified UIComponent. If any violations are found, a ValidatorException will be thrown containing the FacesMessage describing the failure.

        For a validator to be fully compliant with Version 2 and later of the specification, it must not fail validation on null or empty values unless it is specifically intended to address null or empty values. An application-wide <context-param> is provided to allow validators designed for JSF 1.2 to work with JSF 2 and later. The javax.faces.VALIDATE_EMPTY_FIELDS <context-param> must be set to false to enable this backwards compatibility behavior.

        Specified by:
        validate in interface Validator
        Parameters:
        context - FacesContext for the request we are processing
        component - UIComponent we are checking for correctness
        value - the value to validate
        Throws:
        NullPointerException - if context or component is null
        ValidatorException - if validation fails

      • saveState

        public Object saveState(FacesContext context)
        Description copied from interface: StateHolder

        Gets the state of the instance as a Serializable Object.

        If the class that implements this interface has references to instances that implement StateHolder (such as a UIComponent with event handlers, validators, etc.) this method must call the StateHolder.saveState(javax.faces.context.FacesContext) method on all those instances as well. This method must not save the state of children and facets. That is done via the StateManager

        This method must not alter the state of the implementing object. In other words, after executing this code:

         Object state = component.saveState(facesContext);

        component should be the same as before executing it.

        The return from this method must be Serializable

        Specified by:
        saveState in interface StateHolder

      • isTransient

        public boolean isTransient()
        Description copied from interface: StateHolder

        If true, the Object implementing this interface must not participate in state saving or restoring.

        Specified by:
        isTransient in interface StateHolder

      • setTransient

        public void setTransient(boolean transientValue)
        Description copied from interface: StateHolder

        Denotes whether or not the Object implementing this interface must or must not participate in state saving or restoring.

        Specified by:
        setTransient in interface StateHolder
        Parameters:
        transientValue - boolean pass true if this Object will not participate in state saving or restoring, otherwise pass false.

Document created the 11/06/2005, last modified the 18/08/2025
Source of the printed document:https://www.gaudry.be/en/java-api-javaee-rf-javax/faces/validator/methodexpressionvalidator.html

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