Transactional propagation Propagation REQUIRED

Question

if some one can explain what this annotation do and when exactly we use it     Transactional propagation Propagation REQUIRED    Thanks

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In Spring applications  if you enable annotation based transaction support using  lt tx annotation-driven  gt  and annotate any class method with  Transactional propagation Propagation REQUIRED  then Spring framework will start a transaction and executes the method and commits the transaction  If any RuntimeException occurred  then the transaction will be rolled back    Actually propagation Propagation REQUIRED is default propagation level  you don t need to explicitly mentioned it    For further info   http   static springsource org spring docs 3 1 x spring-framework-reference html transaction html transaction-declarative-annotations

User · Answer

If you need a laymans explanation of the use beyond that provided in the Spring Docs  Consider this code     class Service        Transactional propagation Propagation REQUIRED      public void doSomething                access a database using a DAO           When doSomething   is called it knows it has to start a Transaction on the database before executing  If the caller of this method has already started a Transaction then this method will use that same physical Transaction on the current database connection   This  Transactional annotation provides a means of telling your code when it executes that it must have a Transaction  It will not run without one  so you can make this assumption in your code that you wont be left with incomplete data in your database  or have to clean something up if an exception occurs   Transaction management is a fairly complicated subject so hopefully this simplified answer is helpful

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To understand the various transactional settings and behaviours adopted for Transaction management  such as REQUIRED  ISOLATION etc  you ll have to understand the basics of transaction management itself    Read Trasaction management for more on explanation

User · Answer

When the propagation setting is PROPAGATION REQUIRED  a logical transaction scope is created for each method upon which the setting is applied  Each such logical transaction scope can determine rollback-only status individually  with an outer transaction scope being logically independent from the inner transaction scope  Of course  in case of standard PROPAGATION REQUIRED behavior  all these scopes will be mapped to the same physical transaction  So a rollback-only marker set in the inner transaction scope does affect the outer transaction s chance to actually commit  as you would expect it to      http   static springsource org spring docs 3 1 x spring-framework-reference html transaction html

[java] @Transactional(propagation=Propagation.REQUIRED)

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