Collections.sublist() not serializable

Ran into a strange serialization issue when trying to add a Java class to memcached…

Caused by:

java.io.NotSerializableException: java.util.RandomAccessSubList
java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1164)
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518)
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483)
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:330)
net.spy.memcached.transcoders.BaseSerializingTranscoder.serialize(
BaseSerializingTranscoder.java:105)

The problem was with a class member that was initialized with Collections.sublist() method. This method returns an instance of java.util.RandomAccessSubList which is not serializable.

The solution was to wrap initialize the list as an ArrayList.

new ArrayList<String>(biglist.subList(2, 4))
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