Spring Boot Test Db Rollback

In this tutorial, you'll learn about Fix Spring Boot Test Database Changes Not Rolling Back. We cover key concepts, practical examples, and best practices.

The Problem

Test data persists between test runs and causes failures.

Quick Fix

Add @Transactional

Wrong:

// No @Transactional

Output:

Test data persists

Right:

@Test
@Transactional
void testCreateUser() { }

Output:

Changes rolled back after test

Use @Rollback

Wrong:

// @Rollback not configured

Output:

Changes not reverted

Right:

@Test
@Rollback
void testUpdateUser() { }

Output:

Changes reverted

Set up test data

Wrong:

// No data setup

Output:

Test has no data

Right:

@Sql(statements = "INSERT INTO users VALUES (1, 'test')")
void testFindUser() { }

Output:

Test data available

Prevention

• Use @Transactional for automatic rollback
• Use @Sql for test data setup
• Clean up test data in @AfterEach when not using @Transactional

Common Mistakes with boot test db rollback

1. Overlapping type class instances that cause GHC to reject the program with ambiguous dispatch errors
2. Non-exhaustive pattern matches that compile with warnings then crash at runtime
3. Misunderstanding that String is [Char] with poor performance for large text operations

These mistakes appear frequently in real-world SPRING code. DodaTech's contributors have identified these patterns through analysis of open-source projects and production systems.

Practice Exercise

Write a pure function that safely divides two integers using Maybe, then test it with edge cases like division by zero and negative numbers.

This exercise reinforces the concepts covered in this guide. Try implementing it before checking online solutions.

FAQ

This quick fix is part of the DodaTech Spring & JVM ecosystem series. Built by the developers of Doda Browser, DodaZIP, and Durga Antivirus Pro.