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When we run our application in GWT Dev Mode, we are getting serialization exceptions as shown below that we do not get if we run from outside of dev mode. Any ideas? Please note that the class MySDO in question extends from com.extjs.gxt.ui.client.data.BaseModel which is itself serializable & also has a public no parameter contructor

Caused by: com.google.gwt.user.client.rpc.SerializationException: Type 'com.foo.MySDO' was not assignable to 'com.google.gwt.user.client.rpc.IsSerializable' and did not have a custom field serializer.For security purposes, this type will not be serialized.: instance = com.foo.MySDO@fd4410
    at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:610) [:]
    at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:129) [:]
    at com.google.gwt.user.client.rpc.core.java.util.Collection_CustomFieldSerializerBase.serialize(Collection_CustomFieldSerializerBase.java:43) [:]
    at com.google.gwt.user.client.rpc.core.java.util.ArrayList_CustomFieldSerializer.serialize(ArrayList_CustomFieldSerializer.java:36) [:]
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  • do you have an empty constructor MySDO() in that class? Commented Apr 19, 2011 at 17:17
  • Yes I do have an empty constructor. Additionally I also have a data member that is part of this class. It also extends from GXT BaseModel & has en empty constructor. Commented Apr 20, 2011 at 4:17

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May be com.foo.MySDO include some other not serialiseble type

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