org.hibernate.exception.SQLGrammarException: could not prepare statement

In case of Spring-boot with H2 Database, need to use properties,

spring.jpa.hibernate.naming.physical-strategy=org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl

Error was becoz Tables name and columns converted to UpperCase with underscore.

For example

createdOn -> CREATED_ON.

The table name you used, GROUP, is a reserved keyword for h2 databases. Rename your table with a name like ADMIN_GROUP.

Here's an extract from the h2 documentation:

Keywords / Reserved Words

There is a list of keywords that can't be used as identifiers (table names, column names and so on), unless they are quoted (surrounded with double quotes). The list is currently:

CROSS, CURRENT_DATE, CURRENT_TIME, CURRENT_TIMESTAMP, DISTINCT, EXCEPT, EXISTS, FALSE, FOR, FROM, FULL, GROUP, HAVING, INNER, INTERSECT, IS, JOIN, LIKE, LIMIT, MINUS, NATURAL, NOT, NULL, ON, ORDER, PRIMARY, ROWNUM, SELECT, SYSDATE, SYSTIME, SYSTIMESTAMP, TODAY, TRUE, UNION, UNIQUE, WHERE

Certain words of this list are keywords because they are functions that can be used without '()' for compatibility, for example CURRENT_TIMESTAMP.

after about 40 minutes I found that user and currentUser should not be used as well

//this cause error
@Column()
private String user; 

this causes: could not prepare statement; SQL [insert into table_progress (id, created, user, progress, updated, xdip) values (default, ?, ?, ?, ?, ?)]

//changed to this and works    
@Column()
private String userP;