Squeryl和Play的问题！ scala中的框架

正常使用和其他一切工作完全正常.但是,如果我在同一个请求中使用多个事务,则会出错.

这就是我设置Squeryl的方式：

def initDB() {
  import org.squeryl._
  import play.db.DB

  Class.forName("com.mysql.jdbc.Driver")
  SessionFactory.concreteFactory = Some(() =>
    Session.create( DB.getConnection,new MySQLAdapter) )
}

示例事务,也是下面的堆栈跟踪中引用的事务：

transaction {
  import models.Game
  Game.planets.insert(planetList) 
  Game.moons.insert(moonList)
}

堆栈跟踪：

Internal Server Error (500) for request GET /generate-galaxy

Execution exception (In /app/Generator.scala around line 330)
SQLException occured : You can't operate on a closed Connection!!!

play.exceptions.JavaExecutionException: You can't operate on a closed Connection!!!
    at play.mvc.ActionInvoker.invoke(ActionInvoker.java:228)
    at Invocation.HTTP Request(Play!)
Caused by: java.sql.SQLException: You can't operate on a closed Connection!!!
    at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:106)
    at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:65)
    at org.squeryl.dsl.QueryDsl$class._executeTransactionWithin(QueryDsl.scala:95)
    at org.squeryl.dsl.QueryDsl$class.transaction(QueryDsl.scala:64)
    at org.squeryl.PrimitiveTypeMode$.transaction(PrimitiveTypeMode.scala:40)
    at generator.Generator$$anonfun$generatePlanets$2.apply(Generator.scala:330)
    at generator.Generator$$anonfun$generatePlanets$2.apply(Generator.scala:55)
    at generator.Generator$.generatePlanets(Generator.scala:55)
    at generator.Generator$.generateGalaxy(Generator.scala:36)
    at controllers.MainRouter$.generateGalaxy(MainRouter.scala:29)
    at play.mvc.ActionInvoker.invokeWithContinuation(ActionInvoker.java:543)
    at play.mvc.ActionInvoker.invoke(ActionInvoker.java:499)
    at play.mvc.ActionInvoker.invokeControllerMethod(ActionInvoker.java:493)
    at play.mvc.ActionInvoker.invokeControllerMethod(ActionInvoker.java:470)
    at play.mvc.ActionInvoker.invoke(ActionInvoker.java:158)
    ... 1 more
Caused by: java.lang.NullPointerException
    ... 14 more

我知道问题不在我的查询中,因为它们在使用scalatra作为Web框架时工作正常.我可以把所有东西放到一个事务块中,但这不是很优雅,我也不确定它是否适用于这种情况 – planetList列表有大约300万个成员,这导致scala在我分裂之前耗尽内存数据库插入到50k元素的较小块中.