What is ActionSupport in Struts2?

ActionSupport class It is a convenient class that implements many interfaces such as Action, Validateable, ValidationAware, TextProvider, LocaleProvider and Serializable .

Which of the following type of validation are supported by Struts2?

Struts2 XML based validation provides more options of validation like email validation, integer range validation, form validation field, expression validation, regex validation, required validation, requiredstring validation, stringlength validation and etc.

When validate method is called in Struts2?

validate method If any of the if statements are true, Struts 2 will call its addFieldError method (which our Action class inherited by extending ActionSupport). If any errors have been added then Struts 2 will not proceed to call the execute method.

Which type of validation we must implement the Validateable interface or extend ActionSupport class and provide the implementation of validate method?

Custom Validation
1) By Custom Validation Here, we must implement the Validateable interface (or extend ActionSupport class) and provide the implementation of validate method. 2) By Input Validation (built-in validators) Struts 2 provides a lot of predefined that can be used in struts 2 application to perform validation.

What is spring boot validation?

The Spring MVC Validation is used to restrict the input provided by the user. To validate the user’s input, the Spring 4 or higher version supports and use Bean Validation API. It can validate both server-side as well as client-side applications.

What is struts2 interceptor ref?

Interceptor is an object that is invoked at the preprocessing and postprocessing of a request. In Struts 2, interceptor is used to perform operations such as validation, exception handling, internationalization, displaying intermediate result etc.

What does validate () method of action form returns?

The validate() method returns an ActionErrors instance. If its not null, then the validation fails, and Struts redisplays the form to the user along with any error messages.

What are struts for?

Struts is an open source framework that extends the Java Servlet API and employs a Model, View, Controller (MVC) architecture. It enables you to create maintainable, extensible, and flexible web applications based on standard technologies, such as JSP pages, JavaBeans, resource bundles, and XML.

How do I validate a REST API in Spring boot?

Let’s create a step-by-step example to demonstrate how to validate the Spring boot REST API request using Hibernate validator.

1. Create Spring boot application in STS.
2. Maven Dependencies.
3. Create User Class.
4. Configure Database.
5. Create UserRepository.
6. Create UserService Class.
7. Create UserController Class.
8. Create ValidationHandler.

What is @RequestBody in Spring boot?

The @RequestBody annotation allows us to retrieve the request’s body. We can then return it as a String or deserialize it into a Plain Old Java Object (POJO). Spring has built-in mechanisms for deserializing JSON and XML objects into POJOs, which makes this task a lot easier as well.

How to do validation in Struts2?

The second method of doing validation is by placing an xml file next to the action class. Struts2 XML based validation provides more options of validation like email validation, integer range validation, form validation field, expression validation, regex validation, required validation, requiredstring validation, stringlength validation and etc.

Why is my validate method not working in actionsupport?

Make sure that your action class extends the ActionSupport class, otherwise your validate method will not be executed. As shown in the above example, the validation method checks whether the ‘Name’ field has a value or not. If no value has been supplied, we add a field error for the ‘Name’ field with a custom error message.

How do I manually validate a form in Joomla Struts2?

Validation in Struts2 can be done manually, by providing a validate method in the Action class which extends ActionSupport or Validatable and ValidationAware. Struts2 Validation: Validating Forms Manually Home Joomla! Back Joomla! Tutorials