Java

• Set
• HashMap
• ArrayList
• LinkedList

• • atomicity
  • visibility
  • happens-before
  • execution re-order
• volatile
• Lock
• concurrent collection
• AQS
• JVM

JVM

• JVM
• GC
• ClassLoader
• Object layout
  I/O
• Blocking I/O
• NIO
• NIO2

Servlet

• Async IO

AOP

• CgLib
• AspectJ
• Spring AOP

Serialization

• False sharing
• Cache line

Troubleshooting

• memory leak
• non-heap memory leak
• infinite loop
• deadlock