Liquibase - Error : relation "databasechangelog" already exists

for h2 database ı was have the same problem.

my connection string was

jdbc:h2:mem:testdb;DB_CLOSE_DELAY=-1;DATABASE_TO_UPPER=false;

After I removed DATABASE_TO_UPPER=false from the end it starts working.

last connection string as follows:

jdbc:h2:mem:testdb;DB_CLOSE_DELAY=-1;

Got this working, we were using older version of posgres, with 9.1 version its accepting defaultSchemaName and its workign now. Thanks for all the suggestions.