Cannot get many to many relationship in spring bootstrap - spring-boot

Question

I have a very simple many to many scenario: One ORDER has many PRODUCT, and each product can belong to many orders.
order :
#Entity
#Table(name = "ORDER")
public class OrderEntity {
#Id
#Column(name="ORDER_ID")
#GeneratedValue(strategy = GenerationType.AUTO)
private long id;
#Column(name="ORDER_NAME")
private String name;
#Column(name="ORDER_DATE")
private Date date;
#ManyToMany
private List<ProductEntity> selectedProducts = new ArrayList<>();
product:
#Entity
#Table(name = "PRODUCT")
public class ProductEntity {
#Id
#Column(name="PRODUCT_ID")
#GeneratedValue(strategy = GenerationType.AUTO)
private long id;
#Column(name="PRODUCT_NAME")
private String name;
#Column(name="PRODUCT_PRICE")
private BigDecimal price;
#ManyToMany
private List<OrderEntity> orders = new ArrayList<>();
(removed getters and setters and constructors for brevity)
However when I startup bootstrap then I get a whole host of errors :
Error executing DDL "drop table order if exists" via JDBC Statement
Syntax error in SQL statement "DROP TABLE ORDER[*] IF EXISTS "; expected "identifier"; SQL statement:
Error executing DDL "create table order (order_id bigint not null, order_date timestamp, order_name varchar(255), primary key (order_id))" via JDBC Statement
Syntax error in SQL statement "CREATE TABLE ORDER[*] (ORDER_ID BIGINT NOT NULL, ORDER_DATE TIMESTAMP, ORDER_NAME VARCHAR(255), PRIMARY KEY (ORDER_ID)) "; expected "identifier"; SQL statement:
create table order (order_id bigint not null, order_date timestamp, order_name varchar(255), primary key (order_id)) [42001-199]
Error executing DDL "alter table order_selected_products add constraint FKrbll8c9ubhjqangdfw2sgkurw foreign key (order_entity_order_id) references order" via JDBC Statement
Syntax error in SQL statement "ALTER TABLE ORDER_SELECTED_PRODUCTS ADD CONSTRAINT FKRBLL8C9UBHJQANGDFW2SGKURW FOREIGN KEY (ORDER_ENTITY_ORDER_ID) REFERENCES ORDER[*] "; expected "identifier"; SQL statement:
alter table order_selected_products add constraint FKrbll8c9ubhjqangdfw2sgkurw foreign key (order_entity_order_id) references order [42001-199]
Error executing DDL "alter table product_orders add constraint FK9pa3r9u6x44jjxrkkhdvhu23k foreign key (orders_order_id) references order" via JDBC Statement
Syntax error in SQL statement "ALTER TABLE PRODUCT_ORDERS ADD CONSTRAINT FK9PA3R9U6X44JJXRKKHDVHU23K FOREIGN KEY (ORDERS_ORDER_ID) REFERENCES ORDER[*] "; expected "identifier"; SQL statement:
alter table product_orders add constraint FK9pa3r9u6x44jjxrkkhdvhu23k foreign key (orders_order_id) references order [42001-199]
I'm not sure why there are these syntax errors. Is this some kind of SQL dialect issue?

Answer 1

ORDER is a very common reserved keyword and that is the root cause of the errors you see.
Change your table name to something else, such as ORDERS, or if you really want to use that name you can try escaping it:
#Entity
#Table(name = "\"ORDERS\"")
public class OrderEntity {
....
}
List of reserved keywords for some common databases:
https://docs.oracle.com/cd/B28359_01/appdev.111/b31231/appb.htm#BABDFFBA
https://learn.microsoft.com/en-us/sql/t-sql/language-elements/reserved-keywords-transact-sql?view=sql-server-2017
https://www.postgresql.org/docs/current/sql-keywords-appendix.html
https://dev.mysql.com/doc/refman/8.0/en/keywords.html