Exception serializing double[][]

[rsc1975]

To reproduce it (v. 2.8.3):

        ObjectMapper mapper = new ObjectMapper(new CBORFactory());
        byte[] cborBytes = mapper.writeValueAsBytes(new double[][]{ {1.2323132131} });

I suspect that the problem is in CBORGenerator the line 678, the call to _verifyValueWrite("") has been already performed in the parent method, line 601, but I'm not familiar with the code, maybe there is another cause.

    private final void _writeNumberNoCheck(double d) throws IOException {
        _verifyValueWrite("write number");
        _ensureRoomForOutput(11);

The exception log trace:

Exception in thread "main" com.fasterxml.jackson.core.JsonGenerationException: Array size mismatch: number of element encoded is not equal to reported array/map size.
    at com.fasterxml.jackson.core.JsonGenerator._reportError(JsonGenerator.java:1897)
    at com.fasterxml.jackson.dataformat.cbor.CBORGenerator._failSizedArrayOrObject(CBORGenerator.java:1089)
    at com.fasterxml.jackson.dataformat.cbor.CBORGenerator._verifyValueWrite(CBORGenerator.java:1080)
    at com.fasterxml.jackson.dataformat.cbor.CBORGenerator._writeNumberNoCheck(CBORGenerator.java:678)
    at com.fasterxml.jackson.dataformat.cbor.CBORGenerator.writeArray(CBORGenerator.java:604)
    at com.fasterxml.jackson.databind.ser.std.StdArraySerializers$DoubleArraySerializer.serialize(StdArraySerializers.java:686)
    at com.fasterxml.jackson.databind.ser.std.StdArraySerializers$DoubleArraySerializer.serialize(StdArraySerializers.java:620)
    at com.fasterxml.jackson.databind.ser.std.ObjectArraySerializer.serializeContents(ObjectArraySerializer.java:256)
    at com.fasterxml.jackson.databind.ser.std.ObjectArraySerializer.serialize(ObjectArraySerializer.java:216)
    at com.fasterxml.jackson.databind.ser.std.ObjectArraySerializer.serialize(ObjectArraySerializer.java:26)
    at com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue(DefaultSerializerProvider.java:292)
    at com.fasterxml.jackson.databind.ObjectMapper._configAndWriteValue(ObjectMapper.java:3672)
    at com.fasterxml.jackson.databind.ObjectMapper.writeValueAsBytes(ObjectMapper.java:3072)

[cowtowncoder]

Thank you for reporting this. writeArray() is a relatively recent addition which makes sense as otherwise this code path should be tested reasonably well.

[cowtowncoder]

Yes, you are right: there was an extra check (funny that method said "noCheck"... first line was check).
Fix will be in 2.8.5 (2.7 does not suffer from the issue).