How to Resolve 'Table DBNAME.hibernate_sequence Doesn't Exist' Error in Spring Boot and JPA

How can I resolve the error 'Table DBNAME.hibernate_sequence doesn't exist' while using Spring Boot with JPA?

The error 'Table hibernate_sequence doesn't exist' occurs when your Spring Boot application attempts to access a sequence table that has not been created in your database. This typically happens when using the `@GeneratedValue(strategy = GenerationType.AUTO)` annotation for primary keys without an existing sequence set up in the database. Below are steps to resolve this issue.

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;

Causes

• Using `GenerationType.AUTO` defaults to using a sequence in certain database configurations, which may not exist in your database.
• There might be a missing or misconfigured database migration that should have created the required sequence table.
• Your database might be set to a mode that does not support the auto-generated sequences.

Solutions

• Change the ID generation strategy to `GenerationType.IDENTITY` which uses the auto-increment feature of the database, avoiding the need for a separate sequence table.
• Manually create the `hibernate_sequence` table in your database if you prefer to use sequences. You can create it with the following SQL statement: `CREATE TABLE hibernate_sequence (next_val BIGINT NOT NULL); INSERT INTO hibernate_sequence VALUES (1);`
• Check your entity configuration to ensure that there are no conflicting annotations or configurations that might lead to this issue.

Mistake: Not migrating the database schema before running the application.

Solution: Ensure you run all necessary migrations using tools like Flyway or Liquibase to update your database schema.

Mistake: Assuming `GenerationType.AUTO` will work seamlessly across all databases without proper setup.

Solution: Review and adjust the ID generation strategy based on your specific database compatibility.