Embed Java 8 modules in 3.0 databind.

[lpandzic]

From jackson-dev google group:

I would also be interested in devising ways to embed Java 8 parameter name access dynamically, so that for 2.8 we could then embed this functionality, and eliminated need for parameter-names module. Further on would be handling of Optional type, and last Date/Time types (jsr310).
I don't think there is absolute need to keep parameter name access as pluggable module if it can be automatically enabled while still allowing Java7 usage (for short/medium term).

[lpandzic]

This might be of interest:
https://spring.io/blog/2015/04/03/how-spring-achieves-compatibility-with-java-6-7-and-8

[cowtowncoder]

Parameter names, OptionalXxx included in Jackson 3.0; pending future discussions on whether 2.12 (or such) should require Java 8 could open up embedding for 2.x too.
Java 8 date/time is separate question.

[cowtowncoder]

One quick note: I will propose Java 8 baseline for Jackson 2.13: that could lead to embedding of same modules as what 3.x embeds.

[cowtowncoder]

Alas, cannot embed even "datatypes" module, at least in 2.13, due to non-migrateable option:

FasterXML/jackson-modules-java8#216

which I will deprecate for 2.13.

This leaves possibility of parameter names inclusion; will need to see how complex that inclusion would be,

[cowtowncoder]

This has been implemented for Jackson 3.0, via:

• Merge Java8 datatype (Optional, Stream) support in core databind #1774 (jackson-datatype-jdk8)
• Merge Java8 parameter name support (jackson-module-parameter-names) in core databind #1775 (jackson-module-parameter-names)
• Move jackson-datatype-jsr310 into jackson-databind #5032 (jsr-310)