What is PlatformTransactionManager in spring?

What is PlatformTransactionManager in spring?

The PlatformTransactionManager helps the template to create, commit, or rollback transactions. When using Spring Boot, an appropriate bean of type PlatformTransactionManager will be automatically registered, so we just need to simply inject it. Otherwise, we should manually register a PlatformTransactionManager bean.

How do you use PlatformTransactionManager?

PlatformTransactionManager directly to manage your transaction. Simply pass the implementation of the PlatformTransactionManager you are using to your bean through a bean reference. Then, using the TransactionDefinition and TransactionStatus objects you can initiate transactions, roll back, and commit.

When should we use @transactional annotation?

The @Transactional annotation makes use of the attributes rollbackFor or rollbackForClassName to rollback the transactions, and the attributes noRollbackFor or noRollbackForClassName to avoid rollback on listed exceptions. The default rollback behavior in the declarative approach will rollback on runtime exceptions.

How does Spring @transactional really work?

So when you annotate a method with @Transactional , Spring dynamically creates a proxy that implements the same interface(s) as the class you’re annotating. And when clients make calls into your object, the calls are intercepted and the behaviors injected via the proxy mechanism.

Which PlatformTransactionManager s Can you use with JPA?

nanda is right, you can only use JpaTransactionManager. The Transaction Manager abstraction we are talking about here is Spring’s PlatformTransactionManager interface, and JPATransactionManager is the only implementation of that interface that understands JPA.

Which of the following are common implementations of PlatformTransactionManager?

PlatformTransactionManager implementations normally require knowledge of the environment in which they work: JDBC, JTA, Hibernate, and so on.

What is @transactional used for?

@Transactional annotation is used when you want the certain method/class(=all methods inside) to be executed in a transaction.

Can we use @transactional in repository?

The usage of the @Repository annotation or @Transactional . @Repository is not needed at all as the interface you declare will be backed by a proxy the Spring Data infrastructure creates and activates exception translation for anyway.

What is @transactional in Java?

Transactional annotation provides the application the ability to declaratively control transaction boundaries on CDI managed beans, as well as classes defined as managed beans by the Java EE specification, at both the class and method level where method level annotations override those at the class level.

How do you manage transactions across Microservices?

Prepare phase — during this phase, all participants of the transaction prepare for commit and notify the coordinator that they are ready to complete the transaction. Commit or Rollback phase — during this phase, either a commit or a rollback command is issued by the transaction coordinator to all participants.

What is @configuration and @bean in Spring?

Annotating a class with the @Configuration indicates that the class can be used by the Spring IoC container as a source of bean definitions. The @Bean annotation tells Spring that a method annotated with @Bean will return an object that should be registered as a bean in the Spring application context.

Is @transactional mandatory?

MANDATORY Propagation When the propagation is MANDATORY, if there is an active transaction, then it will be used. If there isn’t an active transaction, then Spring throws an exception: @Transactional(propagation = Propagation.

What is 2 phase commit in microservices?

Two-Phase Commit Protocol Two-phase commit protocol (or 2PC) is a mechanism for implementing a transaction across different software components (multiple databases, message queues etc.)

What is the most accepted transaction strategy for microservices?

The most accepted transaction strategy for microservices is avoidance of transactions….

• Such approach could very well lead to merging all microservices to a single monolithic application in the end.
• This is the correct approach.

What is difference between @bean and @component?

No. It is used to explicitly declare a single bean, rather than letting Spring do it automatically. If any class is annotated with @Component it will be automatically detect by using classpath scan. We should use @bean, if you want specific implementation based on dynamic condition.

Can we use @bean without @configuration?

@Bean methods may also be declared within classes that are not annotated with @Configuration. For example, bean methods may be declared in a @Component class or even in a plain old class. In such cases, a @Bean method will get processed in a so-called ‘lite’ mode.

What do you mean by dirty read?

Dirty Reads A dirty read occurs when a transaction reads data that has not yet been committed. For example, suppose transaction 1 updates a row. Transaction 2 reads the updated row before transaction 1 commits the update.

Why do we need 2 phase commit?

A two-phase commit is a standardized protocol that ensures that a database commit is implementing in the situation where a commit operation must be broken into two separate parts. In database management, saving data changes is known as a commit and undoing changes is known as a rollback.

What is Saga pattern in microservice?

The Saga design pattern is a way to manage data consistency across microservices in distributed transaction scenarios. A saga is a sequence of transactions that updates each service and publishes a message or event to trigger the next transaction step.

What are disadvantages of microservices?

Microservices has all the associated complexities of the distributed system. There is a higher chance of failure during communication between different services. Difficult to manage a large number of services.