What is the PlatformTransactionManager?
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.
What is the use of Jpatransactionmanager?
This transaction manager is appropriate for applications that use a single JPA EntityManagerFactory for transactional data access. JTA (usually through JtaTransactionManager ) is necessary for accessing multiple transactional resources within the same transaction.
What is programmatic transaction management?
Programmatic transaction management approach allows you to manage the transaction with the help of programming in your source code. That gives you extreme flexibility, but it is difficult to maintain.
What is use of @transactional?
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.
Does rollback end transaction?
A transaction ends when it is committed or rolled back, either explicitly with a COMMIT or ROLLBACK statement or implicitly when a DDL statement is issued.
What is Spring JtaTransactionManager?
Spring provides support for JTA-based global transaction implementations through a PlatformTransactionManager implementation called JtaTransactionManager . If you use it on a JavaEE application server, it will automatically find the correct javax. transaction. UserTransaction reference from JNDI.
What is the use of @EnableJpaRepositories?
Spring Data Jpa provides EnableJpaRepositories annotation which is used to scan the packages for configuration and repository class for Spring Data JPA.
What is Spring boot EntityManager?
The EntityManager API is used to create and remove persistent entity instances, to find entities by their primary key, and to query over entities. The set of entities that can be managed by a given EntityManager instance is defined by a persistence unit.
What is programmatic and declarative transaction management?
Programmatic transaction management − This means that you have to manage the transaction with the help of programming. That gives you extreme flexibility, but it is difficult to maintain. Declarative transaction management − This means you separate transaction management from the business code.
What is spring AOP?
1. What is Spring AOP? Spring AOP enables Aspect-Oriented Programming in spring applications. In AOP, aspects enable the modularization of concerns such as transaction management, logging or security that cut across multiple types and objects (often termed crosscutting concerns).
Can we use @transactional in controller?
The controller can be made @Transactional , but indeed it’s a common recommendation to only make the service layer transactional (the persistence layer should not be transactional either).
Does @transactional lock table?
A transaction holds exclusive row locks for all rows inserted, updated, or deleted within the transaction. For example, assume that a transaction uses a SELECT statement with the FOR UPDATE clause to lock rows of a table. As a result, it acquires the exclusive row locks and a row share table lock for the table.