How internally works packagesToScan in Spring?

Question

In Spring, Hibernate/JPA Configuration, to load all entities we are using packagesToScan property. How this one internally works and loads all entities.

<property name="packagesToScan">
    <array>
        <value>com.test1</value>
        <value>com.test2</value>
    </array>
</property>

score 1 · Accepted Answer · answered Jun 07 '16 at 06:58

1

JPA implementation scans all classes within the identified packages and checks them if they are annotated as entity using @Entity on class level, if the class annotated then it is an entity class, otherwise it will be ignored.

answered Jun 07 '16 at 06:58

AmjadD

73
1
9

Here i have two questions. – Ranga Reddy Jun 07 '16 at 07:14
1. How internally loads all classes in a Particular package. – Ranga Reddy Jun 07 '16 at 07:15
2. How it will look class is annotated with @Entity annotation. – Ranga Reddy Jun 07 '16 at 07:15
They use reflection to load the needed classes and check if they annotated by a specific annotation. for more details read http://stackoverflow.com/questions/37628/what-is-reflection-and-why-is-it-useful – AmjadD Jun 07 '16 at 07:24
so if you annotate a class using the @Entity tag, then you don't need to add the the packagesToScan in the XML? – JpersaudCodezit Sep 07 '18 at 19:19

How internally works packagesToScan in Spring?

1 Answers1