Don't print to error stream about failure to load JDK 7 types

[Villane]

In version 2.7.x, it is supposedly usable on Java 6, since Java 7 types are loaded dynamically. However, what is the reasoning for printing to error stream "WARNING: Could not load ..." when running on Java 6? If Jackson 2.7 in general still works with Java 6, I don't want my application error stream to be polluted just for fun - my tests may actually be expecting a clean error stream!

[cowtowncoder]

@Villane Did you even try to figure out what was going on? It's not printed directly to error stream, nor for fun. It is logging a warning using java.util.logging.

[Villane]

I beg to differ, please check the 2.7 branch, as I'm talking about 2.7.x. It clearly has System.err.println usages:

https://github.com/FasterXML/jackson-databind/blob/2.7/src/main/java/com/fasterxml/jackson/databind/ext/OptionalHandlerFactory.java

[cowtowncoder]

@Villane Ok. Then this is incorrect. I thought it was using java.util.Logger. Thank you for reporting this.

[cowtowncoder]

Ah ok. So, Jackson 2.7 did indeed only use System.err. 2.8 change to use java.util.logging for Java 7 classes. But there was one other place (for DOM Node and Document types) where System.err was used, will fix that.

Will also backport in 2.7, although it is not certain if new versions from that branch will be released.