Javadoc and sample consistent sample code is missing.

[nicenemo]

Javadoc is missing on a lot of code.
Please provide useful API documentation. Not "a, this is an a" kind of documentation.

I Now have to guess from .NET, NodeJS, Java Documentation and outdated blogposts on how stuff works.
This sometime breaks due to API changes.

[JunyiYi]

Good suggestion of Javadoc for java-core packages.

[JunyiYi]

We have introduced the javadoc toolchain, and we have also written some of the Javadocs. I will close this issue and add more documentation later.