What Does `spring.jpa.open-in-view=true` Do in Spring Boot JPA, and Why Is It Often Discouraged?

Understanding the Purpose of the spring.jpa.open-in-view=true Property

In Spring Boot's JPA configuration, the property spring.jpa.open-in-view is encountered. This property controls the default behavior of handling lazy loading exceptions in a web application. To understand its role effectively, let's explore its implications.

Property Default Value

1. Is the true default value for this property if it's not provided at all?

   • No, the default value for spring.jpa.open-in-view is false if not explicitly set.

Property Function

2. What does this really do? I did not find any good explaining for it.

   • The spring.jpa.open-in-view property enables or disables the Open Session in View (OSIV) anti-pattern. When enabled, it forces the persistence context to remain open during the rendering of the view, allowing lazy-initialized associations to be loaded without triggering a LazyInitializationException.

Relation to SessionFactory and EntityManagerFactory

3. Does it make you use SessionFactory instead of EntityManagerFactory? If yes, how can I tell it to allow me to use EntityManagerFactory instead?

   • spring.jpa.open-in-view does not have any direct impact on whether you use SessionFactory or EntityManagerFactory. Both are supported in Spring Boot's JPA implementation.

Why OSIV is Considered Problematic

The OSIV anti-pattern is generally discouraged due to its detrimental effects on performance and scalability:

• Auto-commit after service layer transactions
• Lack of transaction boundaries
• N 1 query issues
• Increased database connection lease time

Disable OSIV in Spring Boot

To disable OSIV in Spring Boot, set spring.jpa.open-in-view to false in the application.properties file or via another configuration source.

Conclusion

Understanding the implications of the spring.jpa.open-in-view property is crucial for optimizing the performance and scalability of your Spring Boot JPA applications. By disabling OSIV when appropriate, you can avoid common pitfalls associated with this anti-pattern.

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