# Synchronizing classes

As you work with the classes in your Java project, you will need to update the `persistence.xml` file to reflect the changes.

Use this procedure to synchronize the `persistence.xml` file:

1. Right-click the `persistence.xml` file in the Package Explorer and select JPA Tools > Synchronize Classes.

   Note: Use this function if you selected Annotated classes must be listed in the persistence.xml option in the JPA Facet page. In general, you do not have to use this function within the container.

   Synchronizing the persistence.xml File

   Dali adds the necessary `<class>` elements to the `persistence.xml` file.

2. Use the Persistence XML Editor to continue editing the `persistence.xml` file.

Using the XML Editor to edit the persistence.xml file

The persistence.xml file