Heroku Postgres: questa connessione è stata chiusa

Question

Ho sviluppato una piccola applicazione Heroku + Grails + Postreg. Essa avrebbe funzionato bene un po 'a 20 minuti dopo la distribuzione, dopo che ottengo sempre:

This connection has been closed.. Stacktrace follows: Heroku/myapp 
- org.postgresql.util.PSQLException: This connection has been closed. Heroku/myapp 
- at org.postgresql.jdbc2.AbstractJdbc2Connection.checkClosed(AbstractJdbc2Connection.java:837) Heroku/myapp 
- at org.postgresql.jdbc2.AbstractJdbc2Connection.getAutoCommit(AbstractJdbc2Connection.java:798) Heroku/myapp 
- at org.grails.datastore.gorm.GormStaticApi$_methodMissing_closure2.doCall(GormStaticApi.groovy:102) Heroku/myapp 
- at com.myapp.WorkspaceController.list(WorkspaceController.groovy:18) Heroku/myapp 
- at grails.plugin.cache.web.filter.PageFragmentCachingFilter.doFilter(PageFragmentCachingFilter.java:198) Heroku/myapp 
- at grails.plugin.cache.web.filter.AbstractFilter.doFilter(AbstractFilter.java:63) Heroku/myapp 
- at grails.plugin.springsecurity.web.filter.GrailsAnonymousAuthenticationFilter.doFilter(GrailsAnonymousAuthenticationFilter.java:53) Heroku/myapp 
- at grails.plugin.springsecurity.web.authentication.RequestHolderAuthenticationFilter.doFilter(RequestHolderAuthenticationFilter.java:53) Heroku/myapp 
- at grails.plugin.springsecurity.web.authentication.logout.MutableLogoutFilter.doFilter(MutableLogoutFilter.java:62) Heroku/myapp 
- at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) Heroku/myapp 
- at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) Heroku/myapp 
- at java.lang.Thread.run(Thread.java:745) Heroku/myapp 
- 2015-08-07 15:11:10,685 [http-nio-20850-exec-5] ERROR spi.SqlExceptionHelper - This connection has been closed. Heroku/myapp 
- 2015-08-07 15:11:10,689 [http-nio-20850-exec-5] ERROR spi.SqlExceptionHelper - This connection has been closed. Heroku/myapp 
- 2015-08-07 15:11:10,696 [http-nio-20850-exec-5] ERROR errors.GrailsExceptionResolver - PSQLException occurred when processing request: [GET] /api/users/21/workspaces Heroku/myapp 
- This connection has been closed.. Stacktrace follows: Heroku/myapp 

Answer 1

ho risolto io stesso con l'aggiunta di questo DataSource.groovy:

dataSource { 
    pooled = true 
    properties { 
     maxActive = -1 
     minEvictableIdleTimeMillis=1800000 
     timeBetweenEvictionRunsMillis=1800000 
     numTestsPerEvictionRun=3 
     testOnBorrow=true 
     testWhileIdle=true 
     testOnReturn=true 
     validationQuery="SELECT 1" 
    } 
} 

Answer 2

Una combinazione di @ risposta di Macchiatow e @ Commento di Jonik, questo è quello che ho usato per lavorare, con meno proprietà:

dataSource { 
    pooled = true 
    properties { 
     testOnBorrow = true 
     testWhileIdle = true 
     testOnReturn = true 
     validationQuery = "SELECT 1" 
    } 
    driverClassName = "org.postgresql.Driver" 
    dialect = "..." 
}