Java – Useful high level information and links

Latest Release Notes:

Link: http://www.oracle.com/technetwork/java/javase/releasenotes-136954.html

For a less cryptic, more detailed view of the what’s in the latest build of Java’s Standard Edition (JDK and JRE)

Root: http://download.oracle.com/javase/

• So for Java Standard Edition 6 – The details of what’s on the platform is at the following link ….  It is a great starting point for newbies
  • Link: http://download.oracle.com/javase/6/docs/index.html
• Socket Direct Protocol over Infiniband (TCP bypass) –
  • Link:http://download.oracle.com/javase/tutorial/sdp/sockets/overview.html
  • Also read about the  difference in IPv4 and IPv6 here
• Read about the JVM and Hotspot
  • Remember that there are more than one VM in the JDK – there is the Hotspot Client and HotSpot Server
  • Link: http://download.oracle.com/javase/6/docs/technotes/guides/vm/index.html
• JVM Ergonomics – in J2SE5.0
  • -Xms  = maxOf(1/64th of max physical mem, some reasonable number)
    • Note: on a 2GB machine = 1/64th => 32MB for -Xms
  • and -Xmx = minOf( 1/4th of max , 1 GB)
    • Note: on a 2GB machine = 1/4th is 512 MB
  • GC is a Parallel Collector by default  (-XX:+UseParallelGC)

  • Java GC FAQ – lots of answers here
  • Link: http://download.oracle.com/javase/6/docs/technotes/guides/vm/gc-ergonomics.html
• Java NIO
  • From google book on Java NIO link here
  • IBM Article on Merlin NIO – link here
  • NIO examples
  • J2SE 1.4/JDK  1.4.2  links here