CODEWITHSUNDEEP
javaserialization
user253202
user253202

Reputation:

Serialization of anonymous class in Java

Is it possible to searialize/desearialize anonymous class in Java?

Example:

ByteArrayOutputStream operationByteArrayStream = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(operationByteArrayStream);
oos.writeObject(new Task() {
    public void execute() {
        System.out.println("Do some custom task"));
    }
});

My problem is that I want to do some custom admin tasks so that i don't need a release for every task. So what i'm trying to do - is via Groovy scripting engine post custom task via HTTP endpoint and serialize them into db to run them in time.

Upvotes: 8

Views: 4715

Answers (4)

user1619637
user1619637

Reputation: 71

Note that in addition to Task implementing Serializable, the outer class must also be Serializable. You may end up serializing unnecessary member states.

Upvotes: 7

Peter Lawrey
Peter Lawrey

Reputation: 533530

It is possible, by dangerous. The name/number of anonymous classes is generated by the compiler and is based on the order they appear in the file. e.g. if you swap the order of two classes, their names will swap as well. (Classes are deserialized by name)

Upvotes: 8

João Fernandes
João Fernandes

Reputation: 1101

Sure! In your case class Task should implement the Serializable interface.

Upvotes: 0

Simon
Simon

Reputation: 1851

This is certainly possible. Java generates an internal name for anonymous classes (Similar to DeclaredInThisClass$1, DeclaredInThisClass$2 if you declare them in a class called DeclaredInThisClass) and will happily serialize/deserialize them.

Upvotes: 0

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