new domain object created with grails console not visible in dbconsole - grails

Question

I am trying to create a new domain object in the grails console with the help of this guide.
According to the console output the new object is created:
grails> shell
groovy:000> new foo.Book(title: 'bar').save(failOnError: true, flush: true)
groovy:000> foo.Book : 1
groovy:000> foo.Book.list()
groovy:000> [foo.Book : 1]
But this new book entity is not visible in the dbconsole
The table BOOK is present when I connect with the JDBC url for the dev environment as found in DataSource.groovy:
jdbc:h2:mem:devDb;MVCC=TRUE
username: sa
password: <blank>
but a select returns 0 rows
The relevant piece of DataSource.groovy config (the default)
dataSource {
pooled = true
driverClassName = "org.h2.Driver"
username = "sa"
password = ""
}
hibernate {
cache.use_second_level_cache = true
cache.use_query_cache = false
cache.region.factory_class = 'net.sf.ehcache.hibernate.EhCacheRegionFactory' // Hibernate 3
// cache.region.factory_class = 'org.hibernate.cache.ehcache.EhCacheRegionFactory' // Hibernate 4
}
// environment specific settings
environments {
development {
dataSource {
dbCreate = "create-drop" // one of 'create', 'create-drop', 'update', 'validate', ''
url = "jdbc:h2:mem:devDb;MVCC=TRUE;LOCK_TIMEOUT=10000"
}
}
When the entity is created using the console, rather than the groovy shell, the issue remains.
I am using the newest grails build at this moment, which is 2.3.1
The embedded H2 database vrsion = H2 1.3.173 (2013-07-28)

Answer 1

I think the problem is that the database is getting locked. Let's try this one then (works on my experiment):
edit your grails-app/conf/spring/resources.groovy and make it looking like this:
// Place your Spring DSL code here
beans = {
h2Server(org.h2.tools.Server, "-tcp,-tcpPort,8043") { bean ->
bean.factoryMethod = "createTcpServer"
bean.initMethod = "start"
bean.destroyMethod = "stop"
}
}
Then, modify your grails-app/conf/DataSource.groovy to look like this:
test {
dataSource {
dbCreate = "update"
url = "jdbc:h2:mem:devDb;MVCC=TRUE;LOCK_TIMEOUT=10000"
}
}
Now, you are ready to add some new objects as per the tutorial:
$ grails
grails> run-app
grails> shell
groovy:000> new test.Book(title: 'Book 1').save(failOnError: true)
===> test.Book : 1
groovy:000> new test.Book(title: 'Book 2').save(failOnError: true)
===> test.Book : 2
groovy:000> test.Book.list()
===> [test.Book : 1, test.Book : 2]
To view the H2 console, go to
http://localhost:8080/{project}/dbconsole
but select [Generic H2 Server] from the list and on the JDBC URL enter:
jdbc:h2:tcp://localhost:8043/mem:devDb
and connect. I hope that helps
======================
After a bit further experimentation, it appears that locking was your problem and you need to use a mixed mode approach when connecting to your H2. You can read more information here:
http://www.h2database.com/html/features.html#auto_mixed_mode
So, the simplest thing to do is use this jdbc connection URL:
url = "jdbc:h2:/tmp/myDB;MVCC=TRUE;LOCK_TIMEOUT=10000;AUTO_SERVER=TRUE"
for both your application and the H2 dbconsole (notice the AUTO_SERVER=TRUE) (no need to modify the spring bean)

Answer 2

I suggest to change the
dbCreate = "create-drop"
to
dbCreate = "update"
on your DataSource.groovy and try again

Answer 3

When I modified the spring bean as Nick suggested, I could not start run-app and at the same time start the grails console or shell. Here is the error I got:
Message: Error creating bean with name 'h2Server': Invocation of init method failed; nested exception is org.h2.jdbc.JdbcSQLException: Exception opening port "8043" (port may be in use), cause: "java.net.BindException: Address already in use" [90061-173]
The simple change to url worked, thanks Nick -:)