Serialization and log4j, any recommendations?

[Dimitris]

Hello there,

I have a Logger instance (log4j library) in a class:

private final static Logger logger = Logger.getLogger(Person.class.getName());

When I try to serialize an object of that class it gives me the following:

com.fasterxml.jackson.databind.JsonMappingException: 

No serializer found for class org.apache.log4j.helpers.NullEnumeration and no properties discovered to create BeanSerializer 

(to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) ) 

(through reference chain: 

com.vmware.vscale.core.AppState["logger"]->org.apache.log4j.Logger["parent"] >org.apache.log4j.spi.RootLogger["allAppenders"])

Adding @JsonIgnore, ignores it and everything works. However, when using the deserialized object it doesn't log anymore...

So the question is, what is a good way to take care of a logger? I just need to have it logging after it's deserialized.

Thank you,

Dimitris

[Tatu Saloranta]

You probably need a custom serializer, deserializer, which includes whatever information you consider necessary to retain. At least name, but also if there is some configuration.

This is not something standard Jackson databind can help a lot with (as it can not contain references to 3rd party libs). But if this is/was common enough need, there is always possibility of simple "jackson-datatype-log4j" module (or even "jackson-datatype-logging" that could support slf4j too?).

Such an extension module could add full and proper handling of logger instances.

Alternatively, perhaps you could just consider using static logger references, which is a common usage pattern with loggers.

-+ Tatu +-

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