SerializationException: type not included in serializable type set

Question

In my Google Web Toolkit project, I got the following error:

com.google.gwt.user.client.rpc.SerializationException: Type ‘your.class.Type’ was not included in the se

Answer 1

GWT keeps track of a set of types which can be serialized and sent to the client. your.class.Type apparently was not on this list. Lists like this are stored in .gwt.rpc files. These lists are generated, so editing these lists is probably useless. How these lists are generated is a bit unclear, but you can try the following things:

• Make sure your.class.Type implements java.io.Serializable
• Make sure your.class.Type has a public no-args constructor

• Make sure the members of your.class.Type do the same

• Check if your program does not contain collections of a non-serializable type, e.g. ArrayList