[2.0] Cannot register class in Ebean server - how to debug

[Thomas Koeppen]

Hi everybody,

After "play run" we get several non-reproducable errors, for example [1]:
Configuration error [Cannot register class [models.Order] in Ebean server]

No code change was made, just restarted play and then we got this error.

Workaround is stop play, "play clean compile" and "play run".

What is the recommended way to debug play and ebean itself to see what happens behind the scenes?

Kind regards,
Thomas

[1] [error] application -

! @69a4o42lg - Internal server error, for request [GET /] ->

play.api.Configuration$$anon$1: Configuration error [Cannot register class [models.Order] in Ebean server]
    at play.api.Configuration$.play$api$Configuration$$configError(Configuration.scala:70) ~[play_2.9.1.jar:2.0-RC1-SNAPSHOT]
    at play.api.Configuration.reportError(Configuration.scala:257) ~[play_2.9.1.jar:2.0-RC1-SNAPSHOT]
    at play.Configuration.reportError(Configuration.java:119) ~[play_2.9.1.jar:2.0-RC1-SNAPSHOT]
    at play.db.ebean.EbeanPlugin.onStart(EbeanPlugin.java:70) ~[play_2.9.1.jar:2.0-RC1-SNAPSHOT]
    at play.api.Play$$anonfun$start$1.apply(Play.scala:60) ~[play_2.9.1.jar:2.0-RC1-SNAPSHOT]
    at play.api.Play$$anonfun$start$1.apply(Play.scala:60) ~[play_2.9.1.jar:2.0-RC1-SNAPSHOT]
Caused by: java.lang.VerifyError: (class: models/Order, method: toJson signature: ()Lcontrollers/Orders$OrderJson;) Incompatible object argument for function call
    at java.lang.Class.forName0(Native Method) ~[na:1.6.0_29]
    at java.lang.Class.forName(Class.java:247) ~[na:1.6.0_29]
    at play.db.ebean.EbeanPlugin.onStart(EbeanPlugin.java:68) ~[play_2.9.1.jar:2.0-RC1-SNAPSHOT]
    at play.api.Play$$anonfun$start$1.apply(Play.scala:60) ~[play_2.9.1.jar:2.0-RC1-SNAPSHOT]
    at play.api.Play$$anonfun$start$1.apply(Play.scala:60) ~[play_2.9.1.jar:2.0-RC1-SNAPSHOT]
    at scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:59) ~[scala-library.jar:0.11.2]

[werner hoffmann]

same problem here.
Described Workaround does not work.

Do you have any solutions for me? Where to look for the bug?
Wrong configuration in database?

[simon VACHER]

Hi !
We are experiencing the same problem here .... Does anyone have a solution please ?
Thanks in advance !

[Ömer Faruk Gül]

Have anyone found a solution to this? I am about to abonden play2 beacuse of this "magical" problems.

[Hamilton Lima]

got the same issue but the : clean / compile didn't work :\

[alex s]

пятница, 12 июля 2013 г., 7:02:08 UTC+4 пользователь Hamilton Lima написал:

got the same issue but the : clean / compile didn't work :\

Stack trace?

[Ömer Faruk Gül]

Well, in my case I didn't have setters and getters for all the properties of my model.

The solution was to define a setter and a getter for the "id" property and always use object.getId() instead of object.id

Maybe that could help.

[Ashesh Ambasta]

This is still a problem in 2.4.x and which is why we're moving away from Play Framework and replacing services written in it in production.

[Erol Merdanović]

Afaik, Play will automatically generate setters and getters. Have you tried defining them manually? In my case, clean and rerun solves the problem.