![]() ![]() You can imporve performance and optimize your app by using read-only data-sources (set "readOnly=true" in you JNDI data-source in server.xml) read "Declarative transaction management" in Spring Docs.Rollback can be controlled declaratively, not merely programmatically. The Spring Framework offers declarative rollback rules: a feature with no EJB equivalent, which we'll discuss below. see Provided JPA/Spring Template and Properties file:Ģ) inject it into the entiry manager factory (see Entity Management).We recommend using a declarative approach to make use of the transaction manager.see "Dealing with multiple persistence units" in Spring Docs.One Transaction Manager per Persistence Unit Declarative should be used for most applications.Pragmatic Transaction Management: which to use These are the kind of questions you need to be asking when deciding where to put the Declarative vs. If the email fails (probably should have some kind of fail safe on this so it won't fail) then should it roll baack the change password and the audit? So in the above, if the audit fails, then should the password change also fail? If so, then the transaction should be around 1 and 2 (so at the service layer). email the client that the password has changed.Transactional Annotations should be placed around all operations that are inseparable.įor example, your call is "change password". For best performance annotating is more Annotation, when to annotate at the service layer.If you have several DAOs injected into a Service that need to work together in a single transaction A Service might make use of various DAOs to achieve what it needs, i.e.Service layer should be annotated, since it's the one that knows about units of work and use cases.note: do NOT use JTA unless you are faimiliar with Java Transaction API Annotation, DAO vs.recommend:Atomikos JTA transaction manager, since it's open-source, free and easy to configure.hence if you need to use this within tomcat you need to use a 3rd party library JTA: requires a full-blown J2EE server which tomcat is NOT.RESOURCE_LOCAL means transactions are visible to the application and not globally.Recommend RESOURCE_LOCAL: Most applications do NOT need to access a global transaction manager, hence the use of RESOURCE_LOCAL.JPA & Spring Transaction Managment Section in Spring Documentationīest Practices & How To's Persistence-unit transaction-type: RESOURCE_LOCAL vs. ![]() To gain an undestanding of JPA and Spring Transction Management, Please refer to: The diagram below illustrates the relationships between the primary components of the JPA architecture. How to configure a transaction manager for unit-testing locally.How to setup multiple transaction managers (multiple transactional data-sources).How to setup an applicatoin managed transaction manager (RESOURCE_LOCAL) in your web-app.This page contains information and reference about the following topics/questions/how to's
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