Simple(Des|S)erializers not a good fit for handling generic types: what is a good fit?

[gapag]

Hi all

Time and again whenever I want to configure a mapper to do something more than reading/writing POJOS, I end up bumping here:

https://github.com/FasterXML/jackson-databind/blob/b2487d0a33a347ce476282f94a0a125f2adcb559/src/main/java/com/fasterxml/jackson/databind/module/SimpleSerializers.java#L27

Where I read:

/**

 * Simple implementation {@link Serializers} which allows registration of
 * serializers based on raw (type erased class).
 * It can work well for basic bean and scalar type serializers, but is not

 * a good fit for handling generic types (like {@link Map}s and {@link Collection}s).

[...]

 */

Then I am puzzled because I have no idea on what a 'good fit' could be:

* I usually end up hammering a solution that does not look like a good fit (because it still uses SimpleSerializers & SimpleDeserializers)

* and it feels I am repeating work that might be already done in the library.

Could you give examples/pointers to e.g. create a module with  'good fits' to handle generic types, both serializing and deserializing them?

E.g. where should I look to define a module that 

* does not use `SimpleSerializers`, because...

* has custom serializer/deserializer for

     * `Collection<Integer>`

     * `Collection<BigDecimal>`

     * `Map<Integer, List<String>>`

* and uses defaults for all other types

Many thanks in advance.

-gapag

[Gabriele Paganelli]

By module here I mean a Jackson module.

[Tatu Saloranta]

Correct, `SimpleSerializers`/`-Deserializers` won't work for generic
types in general, and structured types specifically.

On implementations that do support these, `jackson-datatype-guava`
from https://github.com/FasterXML/jackson-datatypes-collections/
might be a good example: it supports some of Guava's Map etc types.

-+ Tatu +-

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