New in the Second Edition

All test results have been updated using the latest versions of the VMs available, including the VMs released with SDK 1.4. The previous edition used Versions 1.1.6, 1.2.0, 1.3.0, and HotSpot 1.0. This edition uses Versions 1.1.8, 1.2.2, 1.3.1_02, and 1.4.0 (which effectively includes HotSpot Version 3.0).

This edition has been thoroughly updated and expanded. Table P-1 provides an overview of material that is new or significantly expanded in this edition.

Table P-1. Second edition highlights

Topic	Covered in
Analyzing garbage-collection statistics	Chapter 2
-Xaprof allocation profiler	Chapter 2
Heap tuning	Chapter 3
Reference types	Chapter 4
SoftReference flushing	Chapter 4
WeakHashMap	Chapter 4
Regular expression tuning	Chapter 5
Assertions	Chapter 6
NIO	Chapter 8
Atomic access	Chapter 10
Optimizing collection queries	Chapter 11
LinkedLists versus ArrayLists	Chapter 11
RandomAccess interface	Chapter 11
Collection classes added in SDK 1.4	Chapter 11
Web services	Chapter 12
Performance planning	Chapter 13
J2EE performance tuning	Chapter 15
JDBC	Chapter 16
Servlets and JSPs	Chapter 17
Enterprise JavaBeans	Chapter 18