class cast exception for a key serializer for an enum type

[benson-basis]

See https://github.com/benson-basis/jackson-enum-key-ser-tc with Jackson 2.4.3.

boom(org.fasterxml.tc.EnumKeyBoomTest)  Time elapsed: 0.228 sec  <<< ERROR!
com.fasterxml.jackson.databind.JsonMappingException: org.fasterxml.tc.TestEnumSerializer cannot be cast to com.fasterxml.jackson.databind.ser.std.StdSerializer
        at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:125)
        at com.fasterxml.jackson.databind.ObjectMapper._configAndWriteValue(ObjectMapper.java:2866)
        at com.fasterxml.jackson.databind.ObjectMapper.writeValueAsString(ObjectMapper.java:2323)
        at org.fasterxml.tc.EnumKeyBoomTest.boom(EnumKeyBoomTest.java:39)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)

[benson-basis]

The problem here is that enum maps can't tolerate custom serializers on their key enums.

[cowtowncoder]

I think one part of the solution could be to revert to using standard Map serializer in this case, as it should handle keys of various types, and leave EnumMapSerializer for "simple" cases.

[benson-basis]

Is that something you do or I do? :-)

[cowtowncoder]

I'll try to figure out. Thank you for reporting this!

[cowtowncoder]

Hmmh. Handling is quite messy. I may have to fix this in 2.5, to pass more information for EnumMapSerializer constructor.