Cannot be serialized

[chekanov]

Hello,

The current of exp4j breaks the serialization mechanism of the DMelt project (http:/jwork.org/dmelt/).
For example, the objects created by the class Expression and ExpressionBuilder cannot be serialized
(java.io.NotSerializableException) due to the keys used to create maps inside exp4j. This problem exists after adding " implements java.io.Serializable" statements for Expression and ExpressionBuilder classes.

best, Sergei

[leogtzr]

Have you tried adding "implements Serializable" to the remaining classes?
I agree that we should implement from Serializable.

[chekanov]

Yes, of course. I've added "implements Serializable" to Expression and ExpressionBuilder. It still cannot be serialized. It has a long sting of exceptions that seems related to the unserializable keys of the map used to evaluate expression.

[leogtzr]

You have to do the same with Function, Operator, etc ...

[fasseg]

@chekanov: Currently this is out of scope for exp4j. But I'll leave this feature request open if someone wants to chime in and supply a PR.