What is the difference between Dagger and Dagger 2.0?

Question

What is the difference between Dagger and Dagger 2.0, and why did Google decide to fork the existing project?

Answer 1

Some quotes from the Dagger 2 presentation

Issues of Dagger 1:

• Ugly generated code
• Runtime graph composition
• Inefficient graph creation
• Partial traceability
• Map-like API

Dagger 2 solutions:

• Compile-time validation of the entire graph
• Easy debugging; entirely concrete call stack for provision and creation
• Fully traceable
• POJO API
• Performance

Dagger 2 issues:

• Less flexible
• No dynamism
• No automated migration path from Guice