The document discusses various techniques for improving Java application performance, including: 1. Using tools like JVisualVM and JConsole to analyze performance bottlenecks and determine where to focus optimization efforts. 2. Customizing the Java runtime environment through JVM options and garbage collection settings. 3. Following programming tips like using object scopes and final modifiers efficiently, choosing appropriate collection types, leveraging concurrency constructs properly. 4. Reading further on techniques involving Java I/O, NIO, locks, and lock-free programming.

1. Java Performance Tuning Minh Hoang TO Portal Team

3. Performance Measure

8. JRE Customization

13. Programming Tips

16. Object Scope String wideScope; for(int i =0; i <10000000; i++) { wideScope = “” + i; } vs for(int i = 0; i < 10000000; i++) { String narrowScope = “” + i; }

29. WeakHashMap private static class Entry<K,V> extends WeakReference<K> implements Map.Entry<K,V> { private V value; private final int hash; private Entry<K,V> next; … . }

39. Code from Component class in WebUI Framework public Event getUIComponentEventConfig(String eventName) throws Exception { if(eventMap == null) { synchronized(this) { if(eventMap == null) {…} } } }

41. private volatile long counter; private void nonAtomicOperation(){ counter++;} private void atomicOperation(){ counter = 281283;}

44. Reading Suggestions

46. Thank you!