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Troubleshooting Guide: Windows 11 Taskbar Not Showing - How to Fix It

  If your Windows 11 taskbar is not showing, you can try several troubleshooting steps to resolve the issue. Here are some potential solutions you can try:
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Understanding spring.jpa.open-in-view=true: Managing Database Sessions in Spring Boot

 The property spring.jpa.open-in-view in Spring Boot configures the Open Session in View (OSIV) pattern for managing database sessions in a Spring application that uses Spring Data JPA.

By default, when using JPA in Spring, each database transaction has a separate session that is created and closed automatically. This means that when you retrieve an entity from the database within a transaction, the session is closed once the transaction completes, and any subsequent access to lazily loaded properties of that entity will result in a LazyInitializationException.

The Open Session in View pattern is a solution to this problem. It allows the session to remain open beyond the transaction boundary, effectively keeping the session open until the view rendering is complete. This way, when accessing lazily loaded properties of an entity in the view layer (such as in a web page), the session is still available, and the properties can be accessed without exceptions.

Setting spring.jpa.open-in-view to true enables the OSIV pattern by registering a special interceptor that binds the session to the thread for the entire processing of the request. This way, even though the transaction may have completed, the session remains open until the view is fully rendered.

However, it's worth noting that enabling OSIV has some drawbacks. It can lead to long-running database sessions, increased memory consumption, and potential performance issues. It's generally recommended to avoid relying on OSIV and instead use appropriate strategies like eager fetching or DTO projections to load the necessary data before the transaction completes.

In newer versions of Spring Boot, starting from version 2.0, spring.jpa.open-in-view is set to true by default. If you want to disable OSIV, you can set the property to false.

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