Java Memory Management

Introduction

• Introduction

1. How Memory Works in Java

• Why memory is important
• The role of the stack
• The role of the Heap

2. Values and References

• Passing variables by value
• How objects are passed
• The final keyword
• Memory exercise
• Exercise walkthrough

3. Escaping References

• What are escaping references?
• An escaping references example
• How to avoid escaping references with collections
• Avoiding escaping references with custom objects, part 1
• Avoiding escaping references with custom objects, part 2
• Escaping references exercise
• Exercise walkthrough

4. Introduction to Garbage Collection

• String pools
• Garbage eligibility
• The gc() and finalize() methods
• Understanding what soft leaks are
• Detecting soft leaks

5. Generational Garbage Collection

• Mark and sweep
• Generational garbage collection
• Using the Visual GC tool to view a soft leak
• Using the Memory Analyzer tool
• PermGen and the Metaspace

6. Tuning the Virtual Machine

• Heap size
• PermGen size
• Garbage collection and generation sizes
• Generating heap dumps
• Choosing a garbage collector

7. Hunting for a Memory Leak

• Introducing the example application
• Monitoring the application
• Fixing a memory leak

Conclusion

• Course summary