As some of you may already know, starting with Java 7, OpenJDK is the Reference Implementation (RI) to Java. This presentation walks you through just about that and throws light into many areas that are not common knowledge about this subject.

1. Java

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10. 2006 2007 2010 Beyond
Sun
launches
OpenJDK
(javac,
Hotspot)
Rest of
OpenJDK
is released
Oracle
adopts
OpenJDK
(Sun is
acquired)
Lambdas,
Nashorn &
Adopt
OpenJDK
OpenJDK:
Reference
implementation
of Java 7 SE
Java 10
Java 9
2011 2012 2014
Java 8
World-wide
Community
involvement

18. … JDK6 ⇒ OpenJDK7 → JDK7
JDK7 ⇒ OpenJDK8 → JDK8
JDK8 ⇒ OpenJDK9 → JDK9 …
⇒ applied to
→ produces

19. JDK7 ⇒ OpenJDK8 → JDK8* (1)
JDK8* ⇒ OpenJDK8 → JDK8 (2)
⇒ applied to
→ produces

20. make
$ make [clean] images
$ make bootcycle-images
$ make [component-name]
$ make [module-name]
$ make JOBS=<n>
# Run <n> parallel make jobs

24. GenCollectorPolicy* gc_policy;
if (UseSerialGC) {
gc_policy = new MarkSweepPolicy();
} else if (UseConcMarkSweepGC) {
#ifndef SERIALGC
if (UseAdaptiveSizePolicy) {
gc_policy = new ASConcurrentMarkSweepPolicy();
} else {
gc_policy = new ConcurrentMarkSweepPolicy();
}
#else // SERIALGC
fatal("UseConcMarkSweepGC not supported in this VM.");
#endif // SERIALGC
} else { // default old generation
gc_policy = new MarkSweepPolicy();
}
Universe::_collectedHeap = new GenCollectedHeap(gc_policy);

26. $ git clone <repo-name>

27. $ git pull origin master

28. $ mvn clean install

29. $ hg clone http://hg.openjdk.java.net/jdk8/jdk8 jdk8
$ hg clone http://hg.openjdk.java.net/jdk9/jdk9 jdk9

30. $ ./get_source.sh

31. $ bash configure --with-boot-jdk=<path to jdk8 image>

32. $ make clean images

33. $ make install

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47. See Resources section at the bottom of the page

48. Java

55. … JDK6 ⇒ OpenJDK7 → JDK7
JDK7 ⇒ OpenJDK8 → JDK8
JDK8 ⇒ OpenJDK9 → JDK9 …
⇒ applied to
→ produces

56. make
$ make [clean] images
$ make bootcycle-images
$ make [component-name]
$ make [module-name]
$ make JOBS=<n>
# Run <n> parallel make jobs

57. $ git clone <repo-name>

58. $ git pull origin master

59. $ mvn clean install

60. $ hg clone http://hg.openjdk.java.net/jdk8/jdk8 jdk8
$ hg clone http://hg.openjdk.java.net/jdk9/jdk9 jdk9

61. $ ./get_source.sh

62. $ bash configure --with-boot-jdk=<path to jdk8 image>

63. $ make clean images

69. See Resources section at the bottom of the page