How do you fix could not find any meta-INF persistence XML file in the classpath?

You need to move persistence. xml to a location on your app server’s class path. For a Maven project, that is typically in the src/main/resources folder. Check the Hibernate documentation to see if Hibernate expects the file to be in a sub-folder, or if putting it in the root of the classpath is OK.

Where is persistence xml stored?

The persistence. xml file is typically present in the src/META-INF directory of the persistence (JPA) project. If the project was created with Eclipse, it is typically created and placed there by default.

What does persistence xml do?

The persistence. xml configuration file is used to configure a given JPA Persistence Unit. The Persistence Unit defines all the metadata required to bootstrap an EntityManagerFactory , like entity mappings, data source, and transaction settings, as well as JPA provider configuration properties.

What is JTA persistence xml?

The jta-data-source (for JTA-aware data sources) and non-jta-data-source (for non-JTA-aware data sources) elements specify the global JNDI name of the data source to be used by the container. The JAR file or directory whose META-INF directory contains persistence. xml is called the root of the persistence unit.

How do I run persistence xml?

  1. 3.1 Provide a description of your persistence unit.
  2. 3.2 Specify the managed classes included in your persistence unit.
  3. 3.3 Reference a mapping file.
  4. 3.4 Use a specific persistence provider.
  5. 3.5 Reference a datasource.
  6. 3.6 Activate the 2nd level cache.
  7. 3.7 Deactivate automatic validation of your entities.

What is persistence xml DataSource?

The persistence. xml is also the configuration file where you can use tags to define any global settings for the persistence unit. This is, for example, jta-data-source , which is the name of the DataSource that is used to connect to the database.

What is JPA persistence unit?

A JPA Persistence Unit is a logical grouping of user defined persistable classes (entity classes, embeddable classes and mapped superclasses) with related settings. Defining a persistence unit is optional when using ObjectDB, but required by JPA.

How do I create a persistence unit persistence xml?

So, let’s take a look at JPA’s optional configuration elements and what they enable you to do.

  1. Provide a description of your persistence unit.
  2. Specify the managed classes included in your persistence unit.
  3. Reference a mapping file.
  4. Use a specific persistence provider.
  5. Reference a datasource.
  6. Activate the 2nd level cache.