How Can I Serialize a Java Lambda Without Creating a Dummy Interface?

Serializing Lambdas in Java

Attempting to serialize a lambda in Java can result in a NotSerializableException. This article explores how to elegantly overcome this hurdle without resorting to creating a SerializableRunnable "dummy" interface.

In the example provided, the lambda is defined as:

Runnable r = () -> System.out.println("Can I be serialized?");

Writing this lambda to an ObjectOutputStream throws the NotSerializableException.

Solution

Java 8 introduces the ability to cast an object to an intersection of types. This can be leveraged in the context of serialization, as shown below:

Runnable r = (Runnable & Serializable)() -> System.out.println("Serializable!");

This cast effectively modifies the lambda to implement both the Runnable and Serializable interfaces. Consequently, the lambda becomes serializable without the need for a separate "dummy" interface.

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