Deserializing an empty string as an array field return a non-empty list of one empty String

[aksh3ll]

I have a csv with 11 columns separated with tabulation the last one is an array separated by pipes.
I've declared a schema for the maping.
When the array field have one or many values it works fine, but when it has no value, instead of an empty list, i get a list of one empty String "".

I've found this thread http://stackoverflow.com/questions/12933394/jackson-deserialize-as-an-empty-list but, even with adding the DeserializationFeature presented it didn't change anything (i've try with and withFeatures, i don't see the difference?).

Even if i can't modify the source file, i've tried with quotes, it doesn't change anything.

        CsvSchema schema = CsvSchema.builder()
                .setColumnSeparator('\t')
                .setArrayElementSeparator('|')
                .disableEscapeChar()
                .disableQuoteChar()
                .setUseHeader(false)
                .setNullValue("")
                .addNumberColumn("extId") // 0
                .addNumberColumn("intId") // 1
                .addNumberColumn("pct") // 2
                .addNumberColumn("mask") // 3
                .addColumn(Column.PLACEHOLDER) // 4
                .addColumn("singName") // 5
                .addColumn("PlurName") // 6
                .addColumn(Column.PLACEHOLDER) // 7
                .addColumn(Column.PLACEHOLDER) // 8
                .addColumn(Column.PLACEHOLDER) // 9
                .addArrayColumn("aliases") // 10
                .build();

        CsvMapper mapper = new CsvMapper();
        this.it = mapper
                .reader(clazz)
                .withFeatures(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT, 
                        DeserializationFeature.ACCEPT_EMPTY_ARRAY_AS_NULL_OBJECT,
                        DeserializationFeature.USE_JAVA_ARRAY_FOR_JSON_ARRAY)
                .with(schema)
                .readValues(reader);

According to the idea of the thread i've modified my setter, but it's not a good solution.

    @JsonProperty("aliases")
    public void setAliases(List<String> aliases) {
        if (aliases == null || (aliases.size() == 1 && "".equals(aliases.get(0))))
            this.aliases = new ArrayList<String>();
        else
            this.aliases = aliases;
    }

Maybe i've missed something?

[cowtowncoder]

This sounds more like a bug; and since array handling was added in 2.5.0, I suspect it is just an edge case that was not tested or handled correctly.
Thank you for reproting this!