1. Java Is Still Free
Simon Ritter & Martijn Verburg

2. Terminology
• Java Standard Edition (Java SE)
• Specification of Java language syntax, JVM, core libraries
• Defined by JCP through umbrella JSR
• Java Development Kit (JDK)
• Binary implementation of Java SE (may be a superset)
• Tested using TCK to ensure conformance to Java SE specification
• OpenJDK
• Open source project
• Reference implementation of Java SE standard
• OpenJDK binary
• JDK built directly from OpenJDK source code
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3. The Java Platform Today
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Stable
Secure
Free

4. OpenJDK: New Release Model
• A new version of the JDK will be released every
six months
– March and September
– Started this year with JDK 10 and JDK 11
• OpenJDK development will be more agile
– Previous target was a release every two years
• Features will be included only when ready
– Targeted for a release when feature complete
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5. Long Term Support Releases
• Long term support for all releases is not practical
– One Long Term Support (LTS) release every three years
• Oracle JDK 8 has been classified as an LTS release
– Oracle JDK 8 public updates
• Stop in January 2019 for commercial users
• Non-commercial users get updates until December 2020
• Next LTS release is JDK 11 (then JDK 17, 23, etc.)
• JDK 9 and JDK 10 are feature releases
• Updates for only six months
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6. Which Oracle JDK Binary
• Traditional Oracle branded binary (java.oracle.com)
– Oracle Binary Code License (FoU restrictions)
• New Oracle OpenJDK binary (jdk.java.net)
– GPLv2 with CPE license (no restrictions)
– Security and bug fix updates only for six months
• Only until next JDK release
• Two scheduled updates
– No overlap of updates for previous version
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7. Converged Binaries
Oracle JDK
OpenJDK
Java SE
JDK 10 and earlier
Java SE
OpenJDK
& Oracle JDK
JDK 11 and later

8. Converged Binaries (JDK 11)
• Some closed-source parts of the JDK will be open-
sourced
– Flight recorder
– Mission control
– Others
• Other closed-source parts will be removed
– Browser Plugin
– Java Web Start
– JavaFX
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9. Backwards Compatibility
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"Clean applications that just depend on java.se
should just work" - Oracle
JDK 9 and onwards

10. JDK 9: The Clean Up Starts
• JDK 9 was a significant change for Java
– Deprecated APIs were removed for the first time
• Six methods and one class
• JDK 10 removed 1 package, 6 classes, 9 methods and 1 field
– Redundant features eliminated
• jhat tool, JVM TI hprof agent
• Numerous deprecated GC options removed
– Significant command line changes
• JDK 9 removed 187 -XX flags
• JDK 10 removed 36 -XX flags
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11. Housekeeping Will Continue
• More significant removals in JDK 11
– Applets, Browser Plugin, Web Start, JavaFX
– java.se.ee meta-module
• java.corba
• java.transaction
• java.activation
• java.xml.bind
• java.xml.ws
• java.xml.ws.annotation
• More in the future
– CMS GC and Nashorn deprecated, others?
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12. Backwards Compatibility Not Guaranteed
• New versions of Java may include breaking
changes
– Anything for removal will be deprecated first
– Minimum of one release warning
• Could be only six months
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13. Eliminating Confusion
• There will be an LTS release every three years
– This does NOT mean 3 years of free updates
• Oracle JDK (from JDK 11) can ONLY be used in production with a
commercial Java SE subscription
– The only free JDK 11 and later will be OpenJDK binaries
• Oracle JDK 8 can be used indefinitely for free
– But without any further security patches and bug fixes
• Oracle will only lead and contribute to each JDK for 6 months
– For all JDK: Feature and LTS
– Oracle will not backport updates
– Java community will need to do this for LTS
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14. The Java Platform Today
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Stable
Secure
Free
Choose two out of three

15. Azul's Zulu Java

16. Zulu Java
• Azul’s free binary distribution of OpenJDK
– Passes all TCK tests
• JDK 6, 7, 8, 9,10 and 11 (EA) available
• Wider platform support:
– Intel 64-bit Windows, Mac, Linux
– Intel 32-bit Windows and Linux
– ARM 32 and 64-bit
– PowerPC
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www.azul.com/downloads/zulu

17. AdoptOpenJDK’s Java

18. AdoptOpenJDK Java
• AdoptOpenJDK’s free binary distribution of OpenJDK
– Some builds passes all TCK tests
• No commercial support, i.e. Free binaries only
• JDK 8, 9,10 and 11 (EA) available
• Widest platform support:
– Intel 64-bit Windows, Mac, Linux
– Intel 32-bit Windows and Linux
– ARM 32 and 64-bit
– PowerPC, AIX, Solaris, Linux s390, PowerPC LE et

19. Summary

20. Java Continues To Evolve
• Faster Java releases
– Feature release every 6 months
– Access to free updates is a consideration
– Java remains free
• Lots of ideas to improve Java
– Value types, fibres, syntax improvements
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21. Questions?