Heroku + Grails - missing DATABASE_URL when building app on heroku
===

I'm trying to connect my application to Shared Database 5MB using grails tutorial. I'm using grails 2.1.0. On my local machine when I run heroku config I can see that DATABASE_URL is set, but after executing git push... my build stops with error:

    Error packaging application: Error loading DataSource.groovy: null (Use --stacktrace to see the full trace)
    Failed to build app
    Heroku push rejected, failed to compile Grails app

So I've added logging to see how environment looks on heroku. I've added println System.env to Datasource.groovy and I cannot find any DATABASE_URL:

    .[OLDPWD:/app/tmp/repo.git/.cache, SHELL:/bin/bash, SHLVL:2, GIT_DIR:., JAVA_HOME:/usr/lib/jvm/java-6-openjdk, PATH:/app/tmp/repo.git/.cache/.grails/bin::/usr/local/bin:/usr/local/sbin:/usr/bin:/bin:/usr/sbin:/sbin, SSH_CLIENT:XXX, MAIL:XXX, USER:XXX, LOG_TOKEN:t.9e79a5be-dfa2-446e-9f83-f6b4ebbc4eb7, GRAILS_HOME:/app/tmp/repo.git/.cache/.grails, PWD:XXX, HOME:/app/, LOGNAME:u11846, _:/app/tmp/repo.git/.cache/.grails/bin/grails, SSH_CONNECTION:XXX, LD_LIBRARY_PATH:/usr/lib/jvm/java-6-openjdk/jre/lib/amd64/server:/usr/lib/jvm/java-6-openjdk/jre/lib/amd64:/usr/lib/jvm/java-6-openjdk/jre/../lib/amd64]

I have checked with heroku addons that for my application shared database is installed:

    heroku addons
    === XXX Configured Add-ons
    shared-database:5mb


and when I execute heroku config

    heroku config
    === Config Vars for XXX

    DATABASE_URL:        postgres://XXX
    JAVA_OPTS:           -Xmx384m -Xss512k -XX:+UseCompressedOops
    SHARED_DATABASE_URL: postgres://XXX

Datasource.groovy:

    production {
        dataSource {
            dbCreate = "update"
            driverClassName = "org.postgresql.Driver"
            dialect = org.hibernate.dialect.PostgreSQLDialect

            println System.env
            println System.env.DATABASE_URL
            uri = new URI(System.env.DATABASE_URL)
            println uri

            url = "jdbc:postgresql://" + uri.host + uri.path
            username = uri.userInfo.split(":")[0]
            password = uri.userInfo.split(":")[1]
        }
    }

In BuildConfig.groovy I've added

    runtime 'postgresql:postgresql:8.4-702.jdbc3'

I can launch application locally with DATABASE_URL set to local postgresql. I'm building war and running it on jetty.

Can anyone tell me what am I missing?