Question

我开发了一个小的Heroku + Grails + Postreg应用程序。部署后20分钟它会工作正常，之后我总是得到：

 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

我已经通过将其添加到DataSource.groovy来解决了这个问题：

<html>
<head>  
    <title>tester</title>
 </head>
 <body> 
 <table width="100%">
  <tr>
  <td>
 <table style="border:1px solid black;border-collapse:collapse;float:left;margin:10px">  
    <th style="border:1px solid black;padding:3px" bgcolor="#DDDDDD" align="left">First</th>  
    <th style="border:1px solid black;padding:3px" bgcolor="#DDDDDD" align="left">last</th>  
    <tr bgcolor="#FFFFFF" style ="height:23px;">    
        <td style="border:1px solid black;padding:3px" align="left"><code> </code></td>    
        <td style="border:1px solid black;padding:3px" align="right"><code> </code></td>  
    </tr>  
    <tr bgcolor="#FFFFFF">    
    <td style="border:1px solid black;padding:3px" align="left"><code>Bob</code></td>    
    <td style="border:1px solid black;padding:3px" align="left"><code>Smith</code></td>  
    </tr>  
</table>
 </td>
 <td>
 <table style="border:1px solid black;border-collapse:collapse;float:left;margin:10px">  
    <th style="border:1px solid black;padding:3px" bgcolor="#DDDDDD" align="left">First</th>  
    <th style="border:1px solid black;padding:3px" bgcolor="#DDDDDD" align="left">last</th>  
    <tr bgcolor="#FFFFFF" style ="height:23px;">    
        <td style="border:1px solid black;padding:3px" align="left"><code> </code></td>    
        <td style="border:1px solid black;padding:3px" align="right"><code> </code></td>  
    </tr>  
    <tr bgcolor="#FFFFFF">    
    <td style="border:1px solid black;padding:3px" align="left"><code>Stevev</code></td>    
    <td style="border:1px solid black;padding:3px" align="left"><code>Clarck</code></td>  
    </tr>  
</table>
</td>
</tr>
</table>
</body>
</html>

Answer 2

@Macchiatow的答案和@ Jonik的评论的组合，这是我以前工作的，具有较少的属性：

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

Heroku Postgres：此连接已关闭

2 个答案: