performance - Obsolete Java Optimization Tips

Question

There are number of performance tips made obsolete by Java compiler and especially Profile-guided optimization. For example, these platform-provided optimizations can drastically (according to sources) reduces the cost of virtual function calls. VM is also capable of method inlining, loop unrolling etc.

What are other performance optimization techniques you came around still being applied but are actually made obsolete by optimization mechanisms found in more modern JVMs?

Answer 1

The final modifier on methods and method parameters doesn't help with the performance at all.

Also, the Java HotSpot wiki gives a good overview of the optimizations used by HotSpot and how to efficiently use them in Java code.