Quick Answer: Is RestController Thread Safe?

Is Spring MVC multi threaded?

3 Answers.

With all frameworks of that type, it is safe to assume that the controller methods will be processed simultaneously (i.e.

in multiple concurrent threads)..

What is difference between @controller and RestController?

The @Controller is a common annotation that is used to mark a class as Spring MVC Controller while @RestController is a special controller used in RESTFul web services and the equivalent of @Controller + @ResponseBody. 2.

Is Singleton bean thread safe in spring?

So eventually thread safety depends on the code and the code only. And this is the reason why Spring beans are not thread safe per se. Spring singleton beans are NOT thread-safe just because Spring instantiates them. … Spring just manage the life cycle of singleton bean and maintains single instance of object.

Can we override dispatcher servlet?

This is base class for WebApplicationInitializer implementations that register a DispatcherServlet in the servlet context. Please note that if you need to customize the DispatcherServlet , you can override the createDispatcherServlet() method.

What’s the difference between @component @repository & @service annotations in spring?

@Component is a generic stereotype for any Spring-managed component or bean. @Repository is a stereotype for the persistence layer. @Service is a stereotype for the service layer. @Controller is a stereotype for the presentation layer (spring-MVC).

Is spring boot application thread safe?

In a standard servlet-based Spring web application, every new HTTP request generates a new thread. If the container creates a new bean instance just for that particular request, we can say this bean is thread-safe.

Is HashSet thread safe?

HashSet is not thread safe HashSet in Java is not thread safe as it is not synchronized by default. If you are using HashSet in a multi-threaded environment where it is accessed by multiple threads concurrently and structurally modified too by even a single thread then it must be synchronized externally.

What is @RequestMapping?

@RequestMapping is one of the most common annotation used in Spring Web applications. This annotation maps HTTP requests to handler methods of MVC and REST controllers. In this post, you’ll see how versatile the @RequestMapping annotation is when used to map Spring MVC controller methods.

What are REST API in Java?

The term REST stands for REpresentational State Transfer. It is an architectural style that defines a set of rules in order to create Web Services. In a client-server communication, REST suggests to create an object of the data requested by the client and send the values of the object in response to the user.

How can we make Singleton bean thread safe in spring?

Singleton spring beans has no relation with thread safety. spring container only manages life-cycle of objects and guaranteed that only one object in spring container. so If an Non thread safe object is injected then obviously it is not thread safe. To make it thread safe you have to handle it by coding.

Is StringBuilder thread safe?

StringBuffer is synchronized and therefore thread-safe. StringBuilder is compatible with StringBuffer API but with no guarantee of synchronization. Because it’s not a thread-safe implementation, it is faster and it is recommended to use it in places where there’s no need for thread safety.

Can we have two dispatcher servlet?

You can have as many DispatcherServlets as you want. Basically what you need to do is duplicate the configuration and give the servlet a different name (else it will overwrite the previous one), and have some separate configuration classes (or xml files) for it.

What does @service do in spring?

The @Component annotation marks a java class as a bean so the component-scanning mechanism of spring can pick it up and pull it into the application context. The @Service annotation is also a specialization of the component annotation.

What is @RestController?

Spring RestController annotation is a convenience annotation that is itself annotated with @Controller and @ResponseBody . This annotation is applied to a class to mark it as a request handler. Spring RestController annotation is used to create RESTful web services using Spring MVC.

Which of the following are thread safe?

Since String is immutable in Java, it’s inherently thread-safe. 2) Read-only or final variables in Java are also thread-safe in Java. 3) Locking is one way of achieving thread-safety in Java. … 5) Example of thread-safe class in Java: Vector, Hashtable, ConcurrentHashMap, String, etc.

Why controller is used in spring?

@Controller annotation is an annotation used in Spring MVC framework (the component of Spring Framework used to implement Web Application). The @Controller annotation indicates that a particular class serves the role of a controller. … This class perform the business logic (and can call the services) by its method.

Where we can declare Spring MVC controller?

Our conventional servlet based Spring MVC application with a simple controller is ready, just export it as the WAR file and deploy on Tomcat or any other servlet container. Then go to URL https://localhost:8080/Spring-Controller/hello and you should see the following screen as output.

Does rest controller return view?

@RestController is not meant to be used to return views to be resolved. It is supposed to return data which will be written to the body of the response, hence the inclusion of @ResponseBody .

Is dispatcher servlet thread safe?

Struts2 Action will generate an instance for each request, so there is no thread safety issue. Note: When using Spring to manage Struts2 Action, you need to set the scope of Action to prototype, because the bean in the Spring IOC container is singleton by default.

Is HashMap thread safe?

HashMap is non synchronized. It is not-thread safe and can’t be shared between many threads without proper synchronization code whereas Hashtable is synchronized. … HashMap allows one null key and multiple null values whereas Hashtable doesn’t allow any null key or value.

Is ArrayList thread safe?

Any method that touches the Vector ‘s contents is thread safe. ArrayList , on the other hand, is unsynchronized, making them, therefore, not thread safe. With that difference in mind, using synchronization will incur a performance hit. So if you don’t need a thread-safe collection, use the ArrayList .