Copy operation fails with NPE on 0.8.15

[kringol]

How to reproduce:

new ObjectMapper(new MessagePackFactory()).copy();

or just

new MessagePackFactory().copy();

Causes:

java.lang.NullPointerException
	at org.msgpack.jackson.dataformat.ExtensionTypeCustomDeserializers.<init>(ExtensionTypeCustomDeserializers.java:38)
	at org.msgpack.jackson.dataformat.MessagePackFactory.<init>(MessagePackFactory.java:61)
	at org.msgpack.jackson.dataformat.MessagePackFactory.copy(MessagePackFactory.java:147)
	at com.fasterxml.jackson.databind.ObjectMapper.<init>(ObjectMapper.java:499)
	at com.fasterxml.jackson.databind.ObjectMapper.copy(ObjectMapper.java:617)

[komamitsu]

Ah, the test I wrote checked only the case that MessagePackFactory has ExtensionTypeCustomDeserializers...
https://github.com/msgpack/msgpack-java/blob/develop/msgpack-jackson/src/test/java/org/msgpack/jackson/dataformat/MessagePackFactoryTest.java#L69-L79

This can be a workaround. But anyway I'll fix it soon.

ObjectMapper copy = new ObjectMapper(new MessagePackFactory()
                         .setExtTypeCustomDesers(new ExtensionTypeCustomDeserializers())).copy();

Thanks.

[komamitsu]

@kringol @mrniko Released the fix with 0.8.16.

[kringol]

Awesome, thanks @komamitsu
That was quick :)