JDK 1.8 / Java 8 (자바 8)의 새 기능 주요 특징과 설명 New features #2

JDK 1.8 / Java 8 (자바 8)의 새 기능 주요 특징과 설명 New features #2

1 Reduce Cache Contention on Specified Fields
Define a way to specify that one or more fields in an object are likely to be highly contended across processor cores so that the VM can arrange for them not to share cache lines with other fields, or other objects, that are likely to be independently accessed.

2 Remove the Permanent Generation
Remove the permanent generation from the Hotspot JVM and thus the need to tune the size of the permanent generation.

3 Retire Some Rarely-Used GC Combinations
Remove three rarely-used combinations of garbage collectors in order to reduce ongoing development, maintenance, and testing costs.

4 Enhanced Verification Errors
Provide additional contextual information about bytecode-verification errors to ease diagnosis of bytecode or stackmap deficiencies in the field.

5 Reduce Class Metadata Footprint
Reduce HotSpot’s class metadata memory footprint in order to improve performance on small devices.

6 Small VM
Support the creation of a small VM that is no larger than 3MB.

7 Fence Intrinsics
Add three memory-ordering intrinsics to the sun.misc.Unsafe class.

8 Launch JavaFX Applications
Enhance the java command-line launcher to launch JavaFX applications.