- Filters are called before a request hits the DispatcherServlet.They allow for interception-style, chained processing of web requests for security, timeouts, and other purposes.
- Filters are used with a checksum algorithm that will filter invalid bytes out of a byte stream request body and allow for processing of HTTP requests from the DispatcherRequestServlet.
- Filters are used with a checksum algorithm that will filter invalid bytes out of an octet stream a multipart upload and allow for chained processing of WebDispatcherServlet requests.
- Filters are used to validate request parameters out of the byte stream request body and allow for processing of requests from the DispatcherRequestServlet.
- A resource is the actual String literal that composes a URI that is accessed on a RESTful web service.
- It is an abstract concept that represents a typed object, data, relationships, and a set of methods that operate on it that is accessed via a URI.
- A REST service has a pool of resources composed of allocations of memory that allow a request to be processed.
- A resource for a REST service is an explicit allocation of a thread or CPU cycles to allow a request to be processed.
- @AfterError
- @AfterReturning
- @AfterException
- @AfterExecution
- It supports internationalization of web applications by detecting a user's locale.
- It generates a view by mapping a logical view name returned by a controller method to a view technology.
- It creates a unique view determined by the uers's browser type,supporting cross-browser compatibility.
- It maps custom parameters to SQL views in the database, allowing for dynamic content to be created in the response.
- Spring automatically generated code for you based on your YAML config that defined a MethodInterceptor chain that intercept calls to the instance and computed SQL on the fly.
- A JDK proxy instance is created, which backs the repository interface, and a MethodInterceptor intercepts calls to the instance and routes as required.
- The Spring JDK proxy creates a separate runtime process that acts as an intermediary between the database and the Web server, and intercepts calls to the instance and handles requests.
- Spring automatically generated code for you based on your XML config files that define a SpringMethodAutoGeneration factory that intercepts calls to the instance and creates dynamic method that computer SQL on the fly.
- SpEL(Spring Expression Language) runs in the JVM and can act as a drop-in replacement for Groovy or other languages.
- SpEL(Spring Expression Language) supports boolean and relational operators and regular expressions, and is used for querying a graph of objects at runtime.
- SpEL(Spring Expression Language) allows you to build, configure,and execute tasks such as building artifacts and downloading object dependencies.
- SpEL(Spring Expression Language) natively transpiles one JVM language to another, allowing for greater flexibility.
- dynamic chaining
- banding
- weaving
- interleaving
- JDK Dynamic proxy can proxy only interface, so it is used if the target implements at least one interface. A CGLIB proxy can create a proxy by subclassing and is used if the target does not implement an interface.
- Only JDK Dynamic proxies are used in the Spring Bean Lifecycle. CGLIB proxies are used only for integrating with other frameworks.
- Only CGLIB proxies are used in the Spring Bean Lifecycle. JDK Dynamic proxies are used only for integrating with other frameworks.
- JDK Dynamic proxy can only using an abstract class extended by a target. A CGLIB proxy can create a proxy through bytecode interweaving and is used if the target does not extend an abstract class.
- getArgs()
- getExceptions()
- getSignature()
- getTarget()
Q10. In what order do the @PostConstruct annotated method, the init-method parameter method on beans and the afterPropertiesSet() method execute?
- 1. afterPropertiesSet() 2. init-method 3. @PostConstruct
- 1. @PostConstruct 2. afterPropertiesSet() 3. init-method
- 1. init-method 2. afterPropertiesSet() 3. @PostConstruct
- You cannot use these methods together-you must choose only one.
- It's a transaction attribute configured by spring.security.transactions.xml config file that uses Spring's transaction implementation and validation code.
- It's a transaction must actively validate by the bytecode of a transaction using Spring's TransactionBytecodeValidator class. Default Transaction behavior rolls back on validation exception but commits on proper validation
- It creates a proxy that implements the same interface(s) as the annotated class, allowing Spring to inject behaviors before, after, or around method calls into the object being proxied.
- It's a transaction that must be actively validated by Spring's TransactionValidator class using Spring's transaction validation code. Default Transaction behavior rolls back on validation exception.
@SpringBootApplication
public class App {
public static void main(String args[]) {
SpringApplication.run(App.class, args);
System.out.println("startup");
}
}
public class Print implements InitializingBean {
@Override
public void afterPropertiesSet() throws Exception {
System.out.println("init");
}
}- Nothing will print
- startup init
- init
- startup
@Component
public class Test implements InitializingBean {
@Autowired
ApplicationContext context;
@Autowired
static SimpleDateFormt formatter;
@Override
public void afterPropertiesSet() throws Exception {
System.out.println(context.containsBean("formatter") + " ");
System.out.println(context.getBean("formatter").getClass());
System.out.println(formatter.getClass());
System.out.println(context.getClass());
}
}
@Configuration
class TestConfig {
@Bean
public SimpleDateFormat formatter() {
return new SimpleDateFormat();
}
}- formatter.getClass()
- context.getClass()
- context.getBean("formatter").getClass()
- context.containsBean("formatter")
- SpringInitContainer
- ResourceLoader
- ApplicationEventPublisher
- BeanFactory
- @Secured
- @RequiresRole
- @RestrictedTo
- @SecurePath