java - H2 index name uniqueness -

i have small problem uniqueness of index names in h2 database. mysql/mariadb possible define index named "x" table , table b @ same time. h2 database not possible, since name of index should unique per database.

it problem me, since have base jpa entity class following property defined:

@org.hibernate.annotations.index(name = "x") protected string x; 

it inherited class , b , index creation fails class b following error:

error [main] o.h.tool.hbm2ddl.schemaupdate   - hhh000388: unsuccessful: create index x on b(x) error [main] o.h.tool.hbm2ddl.schemaupdate   - index "x" exists 

is possible tell hibernate automatically create index name or somehow create adapter h2 prefix such index names table names?

although should have database drive schema evolution , use flywaydb migrate schema versions, can override @index want.

i added test on github prove this.

the classes this:

@entity(name = "base") @table(name="base") @inheritance(strategy = inheritancetype.joined) public static abstract class base {      @id     @generatedvalue(strategy = generationtype.auto)     private long id;      @transient     protected string x;      public long getid() {         return id;     }      public string getx() {         return x;     }      public void setx(string x) {         this.x = x;     } }  @entity(name = "childy") @table(name="childy") @discriminatorvalue("y") public static class childy extends base {      private string y;      @override     @org.hibernate.annotations.index(name = "xy")     @access(accesstype.property)     public string getx() {         return x;     } }  @entity(name = "childz") @table(name="childz") @inheritance(strategy = inheritancetype.joined) @discriminatorvalue("z") public static class childz extends base {      private string z;      @override     @org.hibernate.annotations.index(name = "xz")     @access(accesstype.property)     public string getx() {         return x;     } } 

the schema generated this:

create table base (id bigint generated default identity (start 1), primary key (id)) create table childy (x varchar(255), y varchar(255), id bigint not null, primary key (id)) create table childz (x varchar(255), z varchar(255), id bigint not null, primary key (id)) create index xy on childy (x) create index xz on childz (x) 

this way:

1. you retain base class property in domain model (field, getter , setter)
2. each table gets own x column associated index

the problem can't have field in base class, hibernate attempt create twice. can file jira issue on hibernate , mention hbm schema generation should skip index if it's created.

the elegant solution use proper database schema , remove hbm-ddl schema generation.