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To solve this problem, you need to make sure that the UUID field in your entity is annotated properly with @GeneratedValue(strategy=GenerationType.AUTO). This will ensure that the UUID field is automatically generated by the database when the entity is persisted.
If this doesn't work, you may also need to check the type of the UUID field in your entity. It should be a java.util.UUID object, and not a String or any other data type.
If none of these solutions work, you may need to manually generate a UUID before persisting the entity, and set it to the UUID field. You can use the java.util.UUID class to generate a UUID.