Question

I thought I had fixed the problem temporarily, but it turns out I am still having problems.

I am trying to create some specs2 tests for my models layer, I would like to insert some dummy object, and then run some queries to make sure data comes out as expected. Here is what my simple test looks like:

class ModelSpec extends Specification {

    override def is = args(sequential = true) ^ super.is

    object FakeApp extends FakeApplication()

    running(FakeApp){
        println("set up database")
        val newUser = User(
                    email = "[e-mail]",
                    username = "weezybizzle",
                    password = "nutterbutter")
        User.save(newUser)
    }

    running(FakeApp) {
        "User Model" should {
            "be created and retrieved by username" in {
                println("finding someone")
                User.findOneByUsername("weezybizzle") must beSome
            }
            "not find non existant user" in {
                println("finding nobody")
                User.findOneByUsername("nobody") must beNone
            }
        }
    }
}

And here is the stack trace I get from the unit tests:

[info] Compiling 1 Scala source to /www/mojulo3/target/scala-2.9.1/test-classes...
set up database
finding someone
finding nobody
[info] ModelSpec
[info] 
[info] User Model should
[error] ! be created and retrieved by username
[error]     IllegalStateException: this Mongo has been closed (DBTCPConnector.java:123)
[error] com.mongodb.DBTCPConnector._checkClosed(DBTCPConnector.java:123)
[error] com.mongodb.DBTCPConnector.call(DBTCPConnector.java:207)
[error] com.mongodb.DBApiLayer$MyCollection.__find(DBApiLayer.java:313)
[error] com.mongodb.DBApiLayer$MyCollection.__find(DBApiLayer.java:298)
[error] com.mongodb.DBCollection.findOne(DBCollection.java:682)
[error] com.mongodb.DBCollection.findOne(DBCollection.java:661)
[error] com.mongodb.casbah.MongoCollectionBase$class.findOne(MongoCollection.scala:225)
[error] com.mongodb.casbah.MongoCollection.findOne(MongoCollection.scala:897)
[error] com.novus.salat.dao.SalatDAO.findOne(SalatDAO.scala:311)
[error] models.User$.findOneByUsername(User.scala:24)
[error] test.ModelSpec$$anonfun$3$$anonfun$apply$1$$anonfun$apply$2$$anonfun$apply$3.apply(ModelSpec.scala:29)
[error] test.ModelSpec$$anonfun$3$$anonfun$apply$1$$anonfun$apply$2$$anonfun$apply$3.apply(ModelSpec.scala:29)
[error] test.ModelSpec$$anonfun$3$$anonfun$apply$1$$anonfun$apply$2.apply(ModelSpec.scala:29)
[error] test.ModelSpec$$anonfun$3$$anonfun$apply$1$$anonfun$apply$2.apply(ModelSpec.scala:27)
[error] ! not find non existant user
[error]     IllegalStateException: this Mongo has been closed (DBTCPConnector.java:123)
[error] com.mongodb.DBTCPConnector._checkClosed(DBTCPConnector.java:123)
[error] com.mongodb.DBTCPConnector.call(DBTCPConnector.java:207)
[error] com.mongodb.DBApiLayer$MyCollection.__find(DBApiLayer.java:313)
[error] com.mongodb.DBApiLayer$MyCollection.__find(DBApiLayer.java:298)
[error] com.mongodb.DBCollection.findOne(DBCollection.java:682)
[error] com.mongodb.DBCollection.findOne(DBCollection.java:661)
[error] com.mongodb.casbah.MongoCollectionBase$class.findOne(MongoCollection.scala:225)
[error] com.mongodb.casbah.MongoCollection.findOne(MongoCollection.scala:897)
[error] com.novus.salat.dao.SalatDAO.findOne(SalatDAO.scala:311)
[error] models.User$.findOneByUsername(User.scala:24)
[error] test.ModelSpec$$anonfun$3$$anonfun$apply$1$$anonfun$apply$6$$anonfun$apply$7.apply(ModelSpec.scala:35)
[error] test.ModelSpec$$anonfun$3$$anonfun$apply$1$$anonfun$apply$6$$anonfun$apply$7.apply(ModelSpec.scala:35)
[error] test.ModelSpec$$anonfun$3$$anonfun$apply$1$$anonfun$apply$6.apply(ModelSpec.scala:35)
[error] test.ModelSpec$$anonfun$3$$anonfun$apply$1$$anonfun$apply$6.apply(ModelSpec.scala:33)
[info]  
[info]  
[info] Total for specification ModelSpec
[info] Finished in 20 ms
[info] 2 examples, 0 failure, 2 errors
[info] 
[error] Error: Total 2, Failed 0, Errors 2, Passed 0, Skipped 0
[error] Error during tests:
[error]     test.ModelSpec
[error] {file:/www/mojulo3/}mojulo3/test:test: Tests unsuccessful
[error] Total time: 4 s, completed Aug 28, 2012 10:02:33 PM

It looks like the FakeApp is somehow disconnecting from the database, and not reconnecting. I looked into the Play source, and it seems that the application will be stopped and restarted, regardless of whether or not it is actually the same object. I am thinking that the issue may be stemming from the salat onStop() method or onStart() but I am not really sure.

I have been struggling for a while with this, any help, even just on how to reason about the problem, would be greatly appreciated.

Answer 1

This is because it closes the MongoDB connection in the plugin’s onStop method. I’ve submitted a pull request so that this doesn’t happen during testing:

https://github.com/leon/play-salat/pull/27