Pattern: Redundant custom Enum serialization
Issue: -
Checks for enums that define writeObject() or writeReplace() methods, or declare serialPersistentFields or serialVersionUID fields, all of which are ignored for enums.
From the javadoc for ObjectOutputStream:
The process by which enum constants are serialized cannot be customized; any class-specific writeObject and writeReplace methods defined by enum types are ignored during serialization. Similarly, any serialPersistentFields or serialVersionUID field declarations are also ignored--all enum types have a fixed serialVersionUID of 0L.
Example of violations:
enum SomeEnum {
ONE, TWO, THREE
private static final long serialVersionUID = 1234567L // violation
private static final ObjectStreamField[] serialPersistentFields = // violation
{ new ObjectStreamField("name", String.class) }
String name;
Object writeReplace() throws ObjectStreamException { .. } // violation
private void writeObject(ObjectOutputStream stream) { .. } // violation
}