Heroku Postgres：该连接已关闭

Question

我开发了一个小型的Heroku + Grails + Postreg应用程序。在部署后的20分钟内，它能够良好运行，但之后我总是遇到以下问题：

 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

- Macchiatow

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你能否将你的数据源设置粘贴到Grails中？ - Lalit Agarwal

Answer 1

我已经通过在DataSource.groovy中添加以下内容解决了这个问题：

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

- Macchiatow

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这些属性中有哪个实际上起了作用？ - Jonik

我在一个Spring Boot应用程序中遇到了同样的问题（使用Tomcat JDBC中的DataSource），看起来我通过使用"setTestOnBorrow(true); setTestWhileIdle(true); setTestOnReturn(true); setValidationQuery("SELECT 1");"（javadocs）解决了它。谢谢！ - Jonik

Answer 2

结合@Macchiatow的回答和@Jonik的评论，这是我用来工作的代码，使用了更少的属性:

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

- mnd