We'll do our best to compile useful information from a variety of sources here.

Java SE

• Java SE General FAQs
• Common Problems (and their solutions)
• Java Collections API Design FAQ
• Javadoc FAQ
• 'sun.*' package FAQ
• Secure Coding Guidelines

Release Cadence

• Oracle Java SE Releases FAQ

JVM

• Java Virtual Machine Guide
• Garbage Collection Tuning

Subscription & Licensing

• Oracle Java SE Licensing FAQ
• Oracle Java SE Subscription FAQ

OpenJDK

• OpenJDK Developers Guide