Coding⏱️ 2 min read📅 2026-05-31

How to Fix: How to solve the “failed to lazily initialize a collection of role” Hibernate exception

Hibernate LazyInitializationException: failed to lazily initialize a collection of role.

Quick Answer: Use @Fetch(FetchMode.JOIN) on the related entity (TopicComments) or eager-load the collection when retrieving data from the database.

📋 Table of Contents

  1. 🚀 How to Resolve This Issue
  2. 💡 Conclusion

The Hibernate LazyInitializationException occurs when you try to access a lazy-loaded collection without an active session. This can happen when you're trying to fetch related data from the database, but the session has already been closed.

🚀 How to Resolve This Issue

Method 1: Eager Loading

  1. Step 1: Use the @Fetch(FetchType.EAGER) annotation on your collection field to eagerly load the related data.

Method 2: Fetching Related Data in a Single Query

  1. Step 1: Use the @Fetch(FetchType.JOIN) annotation on your collection field to fetch related data using a JOIN.

💡 Conclusion

To avoid the LazyInitializationException, use one of the methods mentioned above. Remember to always keep an active session when accessing lazy-loaded collections.

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