GridFSDBFile sporadic ClassCastException

[Carlos Quiroz]

Hi

I have a spray application that uses casbah and needs to read GridFS. My application works in general ok but there is a small percentage of cases where I get this:

app: java.lang.ClassCastException: com.mongodb.gridfs.GridFSDBFile cannot be cast to com.mongodb.casbah.gridfs.GridFSDBFileSafeJoda

app: at com.mongodb.casbah.gridfs.GridFS.findOne(GridFS.scala:215) ~[casbah-gridfs_2.10-2.6.5.jar:2.6.5]

I'm running a small benchmark that loads the same file all over and only sometimes I get this exception

Just in case I'm not using JodaTime nor calling the RegisterJodaTimeHelpers method

Cheers

Carlos

[Alex FY]

I got the same exception only once with casbah 2.7.1 : 

 java.lang.ClassCastException: com.mongodb.gridfs.GridFSDBFile cannot be cast to com.mongodb.casbah.gridfs.GridFSDBFileSafeJoda

at com.mongodb.casbah.gridfs.GridFS.findOne(GridFS.scala:214) ~[org.mongodb.casbah-gridfs_2.11-2.7.1.jar:2.7.1]

at com.mongodb.casbah.gridfs.GridFS.findOne(GridFS.scala:221) ~[org.mongodb.casbah-gridfs_2.11-2.7.1.jar:2.7.1]

at com.fontyou.factory.services.FileService.findFileById(FileService.scala:46) ~[services.services-0.1-SNAPSHOT.jar:0.1-SNAPSHOT]
        ...

[Alex FY]

I have this exception every day on my production server since i upgrade to casbah 2.7.1 from 2.5.0.

I don't use Casbah JodaTime features, only java.util.Date, can I disable joda features?

[Alex FY]

Nobody have this problem ?

I upgraded to 2.7.3

waiting for a better solution i use this workaround : 

  def findFileById(id: String): Option[Blob] = {

    val doc = try {

      gridFS.findOne(whereIdIs(id))

    } catch {

      case e:java.lang.ClassCastException if(e.getMessage() == "com.mongodb.gridfs.GridFSDBFile cannot be cast to com.mongodb.casbah.gridfs.GridFSDBFileSafeJoda") => {

        log.warn(e.getMessage + " try again")

        gridFS.findOne(whereIdIs(id))

      }

    }

    doc.map(toBlob)

  }

[Ross Lawley]

Hi Alex,

Just to confirm are you using Joda Dates in your application? Have you registered the handlers?

Ross

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[Elmar Weber]

Hello,

we encountered this issue today, unable to reproduce in a stable manner, every few tries it occurs. The workaround with a retry is of course a solution, but I was wondering if anyone has an idea / Update on this?

We do not use JodaTime and we use casbah 2.8.2 with mongodb 3.0 and Scala 2.11.7

Thanks,
Elmar

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[Alex FY]

Hi,

I only use java.util.Date

And i don't register the handler.

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[Ross Lawley]

Hi Alex,

Unfortunately, no one has been able to provide a test case reproducing the issue.  If you're still seeing this issue it would be good to understand what data is causing it and if you can abstract it into a test case.

Ross

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[Elmar Weber]

Hi,

I would not be able to give a reproduceable test case because it happens only sporadic, we actually implemented in code for this case a handler that retries with the exact same data. 90% of the cases it works on the first try, 96% on the 2nd, 99% 3rd, some require a fourth and fifths. After the 10th we break off, but so far no one reached this level =)

Not sure what would help you to debug it further?

Thanks,
Elmar

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[Ross Lawley]

This is bizarre - what versions of Scala and Casbah are you running?

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{ name     : "Ross Lawley",
  title    : "Senior Software Engineer",
  location : "London, UK",
  twitter  : ["@RossC0", "@MongoDB"],
  facebook :"MongoDB"}

[Elmar Weber]

On Thursday, January 7, 2016 at 5:50:34 PM UTC+1, Ross Lawley wrote:

This is bizarre -

I agree =)
 

what versions of Scala and Casbah are you running?

We are using Scala 2.11.7 and Casbah 2.8.2.