Strange behaviour of Grails' application connected to PostgreSQL - postgresql

Question

I'm trying to switch my grails application from h2 to PostgreSQL.
Steps I've done to reach my goal:
Download JDBC from http://jdbc.postgresql.org/download.html (JDBC4 Postgresql Driver, Version 9.3-1100)
Attach JDBC to /lib folder
Change DataSource. Now it looks like:
dataSource {
pooled = true
driverClassName = "org.postgresql.Driver"
dialect="org.hibernate.dialect.PostgreSQLDialect"
username = "postgres"
password = "admin"
}
hibernate {
cache.use_second_level_cache = true
cache.use_query_cache = false
cache.region.factory_class = 'net.sf.ehcache.hibernate.EhCacheRegionFactory'
}
// environment specific settings
environments {
development {
dataSource {
dbCreate = "update" // one of 'create', 'create-drop', 'update', 'validate', ''
//url = "jdbc:h2:mem:devDb;MVCC=TRUE;LOCK_TIMEOUT=10000"
url = "jdbc:postgresql://localhost:5432/admin_panel"
}
}
test {
dataSource {
dbCreate = "update"
url = "jdbc:postgresql://localhost:5432/admin_panel"
}
}
production {
dataSource {
dbCreate = "update"
url = "jdbc:postgresql://localhost:5432/admin_panel"
pooled = true
properties {
maxActive = -1
minEvictableIdleTimeMillis=1800000
timeBetweenEvictionRunsMillis=1800000
numTestsPerEvictionRun=3
testOnBorrow=true
testWhileIdle=true
testOnReturn=true
validationQuery="SELECT 1"
}
}
}
}
And now the game starts. I type 'run-app' in GGTS and I get an error. Objects I'm trying to create using BootStrap cannot be initialized because of Validation: Error initializing the application: Validation Error(s) occurred during save() .
It is really strange because the message says that reference to previously created object is null: Field error in object 'adminpanel.component.Text' on field 'subpage': rejected value [null];.
There should be no possibility that "subpage" is null in this line, so I go to the pgAdmin III to check if this record is created and there I notice that no table is created at all.
Everetyhing works if application is connected to H2, but starts to freak out when I switch it to postgres. Additionally, when I remove everything from BootStrap, application starts and I can create objects normally, but I still cannot see them into pgAdmin. Do you have any advice what else can I check or why GORM does not create tables in my app when I use PostgreSQL ?
Thanks in advance.
EDIT:
I found the source of the problem after few tests more...
PostgreSQL gives a strange value for 'id' column in every table. When I was using H2, I had values from 1..x in every table, in PostgreSQL I have something like this:
table1
id:
1
2
3
-
7
8
9
table2
id:
4
5
6
-
10
11
As you probably noticed, values are given interchangeably for all rows in different tables, so I cannot have e.g. object table1 with id 1 and object table2 with id 1. Do you have idea why?

Answer 1

Grails/Hibernate uses Sequence for object ID for databases like Postgres (or Oracle, etc). By default, Grails uses a shared sequence (hibernate_sequence). So all object will have uniq id, but unique per whole database, not per table.
You can configure domain to use a different Sequence for a domain, like:
static mapping = {
id generator: 'sequence', params: [sequence: 'my_own_sequence']
}
See also
http://www.postgresql.org/docs/9.1/static/sql-createsequence.html
http://grails.org/doc/2.3.4/ref/Database%20Mapping/id.html