Could not fetch the SequenceInformation from the database ERROR but still everything works - spring

Question

I've created user and userRole tables
user entity
#Entity
#Table(name = "USERS")
public class User {
#Id
#Column(name = "USERNAME", nullable = false, unique = true)
private String username;
#Column(name = "PASSWORD", nullable = false)
private String password;
#Column(name = "ENABLED", nullable = false)
private boolean enabled = true;
#OneToMany(cascade = CascadeType.ALL, mappedBy = "user", fetch = FetchType.EAGER)
private Set<UserRole> userRole = new HashSet<>();
userRole entity
#Entity
#Table(name = "USER_ROLES", uniqueConstraints = #UniqueConstraint(
columnNames = { "ROLE", "USERNAME" }))
public class UserRole {
#Id
#GeneratedValue(strategy = IDENTITY)
#Column(name = "user_role_id",
unique = true, nullable = false)
private Integer userRoleId;
#Column(name = "ROLE")
private String role;
#ManyToOne(fetch = FetchType.EAGER)
#JoinColumn(name = "USERNAME")
private User user;
When i launch my app i get an Error and this stack trace:
ERROR JdbcEnvironmentImpl:420 - Could not fetch the SequenceInformation from the database
org.h2.jdbc.JdbcSQLException: Column "start_with" not found [42122-197]
But i don't have any 'start_with' columns. Before my UserRole entity was without userRoleId column and everything worked fine but then i added it to do 'role' column not unique and then this happened. But still everything works fine, i just disturbed by this error, what can be the couse of it?

Answer 1

I suggest checking your Hibernate dialect.
I had a similar error because of a start_value column that Hibernate was looking for in sequences of my PostgresQL database. This field name is a default value in Hibernate's SequenceInformationExtractorLegacyImpl class which has many subclasses, each depending on your precise database server and its version. Hibernate loads the right class according to the dialect you specify.
In my case, I was using the org.hibernate.dialect.PostgreSQLDialect dialect, a (deprecated) class meant to be used with a PostgesQL 8.2 version. I switched to org.hibernate.dialect.PostgreSQL9Dialect since my database was hosted on a PostgresQL 9 server. And the issue was gone.