public Expression getExpressionStringFromAction(final EvaluateAction act) {
        val field = ReflectionUtils.findField(act.getClass(), "expression");
        Assert.notNull(field, "expression cannot be null");
        ReflectionUtils.makeAccessible(field);
        return (Expression) ReflectionUtils.getField(field, act);
    }
Gets expression string from action.

@param act the act
@return the expression string from action
core/cas-server-core-webflow-api/src/main/java/org/apereo/cas/web/flow/configurer/AbstractCasWebflowConfigurer.java