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POProblems with GWT and Enum
 

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    <p>I have an enum in the client part of a GWT application and I am getting an exception when I try to run it that is related to serialization problems. Am I doing anything wrong? I read that enums are supported by GWT and I am using the last version.</p> <p>The enum:</p> <pre><code>public enum AnEnum implements Serializable { ITEM_A("Item a description"), ITEM_B("Item b description"); private String description; private AnEnum(String description) { this.description = description; } public String getDescription() { return description; } public void setDescription(String description) { this.description = description; } } </code></pre> <p>The exception:</p> <pre><code>Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serializeWithCustomSerializer(ServerSerializationStreamWriter.java:742) ... 47 more Caused by: com.google.gwt.user.client.rpc.SerializationException: Type '(...).client.(...).AnEnum' was not included in the set of types which can be serialized by this SerializationPolicy or its Class object could not be loaded. For security purposes, this type will not be serialized.: instance = ITEM_A 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.LinkedList_CustomFieldSerializer.serialize(LinkedList_CustomFieldSerializer.java:36) ... 52 more </code></pre>
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    1. USAntonioJunior
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    1. COwhat package is the enum in, and what paths are listed in gwt.xml's source tags?
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      1. USantony.trupe
    2. COThere definitely seems to be a problem/bug with enums and GWTRPC! I tested your code with GWT 2.0.3, and it works (a no-arg constructor isn't even required). But when I use `setDescription("new value")` before calling the service method, that change to `description` is **lost** during transfer to the server - i.e. the server sees `description` as still being set to "Item a description". I haven't tried it with the latest version of GWT, but maybe Google attempted to fix that problem for GWT 2.1, but introduced the serialization problem.
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      1. USChris Lercher
    3. COJust found something in the [documentation](http://code.google.com/webtoolkit/doc/latest/DevGuideServerCommunication.html) about this: "Enumeration constants are serialized as a name only; none of the field values are serialized." Therefore, it's probably not a good idea to use enums with mutable fields together with GWTRPC.
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