Why do we need persistence.xml

Views: Add Comment Cancel reply. Name required. Email required. Website optional. How do we configure the underlying object-relational-mapping engine and cache for better performance and trouble shooting? The persistence. If you do not specify the jta-data-source tag explicitly, a vendor-specific default is used. You can also add other configuration elements to the persistence. The only mandatory element is the name property of the persistence-unit tag, which the SAP NetWeaver Developer Studio includes in the file automatically.

In the Developer Studio , the persistence. Typically, you use the relevant data source alias name to specify the DataSource. Make sure that the value of the jta-data-source tag is the same as the value of the alias tag in the data-source-aliases.

Specify the name of your version generator table as a value of the com. This is a sample persistence. Improve this answer. Thanks for the answer. I spoke with my colleague who knew more about the project and he says we have no persistence. We don't use hibernate. I'll update the question with the actual file now. NickRosencrantz: If I where you I would not mess around with the settings of Eclipse, rather, I would put another persistance.

Many thanks for the investigation. It turns out that my persistence. Should the web project and EJB project have the same version of the same file? NickRosencrantz: You could do that, but you will have to reflect the changes in both which could be problematic if it slips up your mind. Again, if I where you I would have 1 file in this case with the actual settings and any other files will just contain the location of the actual file.

SparkAndShine Kalaiselvan Velmurugan Kalaiselvan Velmurugan 25 2 2 bronze badges.