Write presentation

Author: Mikkel Kjeldsen

Makefile

@@ -60,6 +60,9 @@ LATEXMK := latexmk $(if $(xelatex),-xelatex,-pdflatex="pdflatex %O %S") \
 
 ## ---- build rules ----
 
+plantuml_diagrams_pu := $(wildcard media/*.pu)
+plantuml_diagrams_png := $(plantuml_diagrams_pu:.pu=.png)
+
 notes_md := $(wildcard $(NOTES)/*.md)
 
 notes_tex := $(patsubst $(NOTES)/%.md,lectures/%.tex,$(notes_md))
@@ -96,6 +99,10 @@ $(handouts_notes_tex): handouts/%.tex: $(NOTES)/%.md
 	    -V scuro="" \
 	    -o $@ $<
 
+media/%.png: media/%.pu
+	java -jar plantuml.jar -tpng $<
+	optipng $@
+
 phony_pdfs := $(if $(always_latexmk),$(pdfs) $(notes_pdf))
 
 # phony targets to make all three PDFS for a single source
@@ -117,7 +124,7 @@ $(notes_pdf): %.pdf: %.tex
 	pdfjam --nup 2x2 --landscape $(dir $@)$(temp_dir)/$(notdir $@) -o $@
 	rm -r $(dir $@)$(temp_dir)
 
-all: $(pdfs) $(notes_pdf)
+all: $(plantuml_diagrams_png) $(pdfs) $(notes_pdf)
 
 # clean up everything except final pdfs
 clean:

media/openjdk.png

@@ -0,0 +1,41 @@
+@startuml
+
+frame Source {
+artifact repo as "openjdk.hg"
+}
+
+frame Builds {
+artifact others as "..."
+
+frame Oracle {
+artifact ojdk as "Oracle JDK"
+artifact oojdk as "Oracle OpenJDK"
+}
+
+artifact ajdk as "Azul Zulu"
+artifact aojdk as "AdoptOpenJDK"
+}
+
+frame "Technology Compatibility Kit" {
+card tck as ""Java SE compatible""
+}
+
+repo --> ojdk
+repo --> oojdk
+repo --> ajdk
+repo --> aojdk
+repo --> others
+
+ojdk   ..> tck
+oojdk  ..> tck
+ajdk   ..> tck
+aojdk  ..> tck
+others ..> tck
+
+tck ..> aojdk
+tck ..> ajdk
+tck ..> ojdk
+tck ..> oojdk
+tck ..> others
+
+@enduml

media/openjdk.pu

@@ -0,0 +1,179 @@
+---
+title: |
+  Overview of new Java\
+  release and licensing strategy
+subtitle: or, "_can I use `var` yet?_"
+sansfont: DejaVu Sans
+slide-numbers: true
+links-as-notes: true
+---
+
+# watsit
+
+## Motivation
+
+\center\includegraphics[width=4\TPHorizModule]{../media/shot-java.jpg}
+
+## Primary resources
+
+- \href{https://bit.do/java-still-free}{Java Is Still Free}
+- \href{https://blog.joda.org/}{Stephen Colebourne}
+- \href{https://www.reddit.com/r/java}{/r/java}
+
+## Terminology
+
+> - "feature": new toys
+> - "update": toy maintenance
+> - "support": babysitters
+> - "free as in beer" a.k.a. "\$free": gratis
+> - "free as in speech" a.k.a. "free": unconstrained
+> - "development": something that supports yourself
+> - "production": something that supports others
+
+## Guiding principles
+
+> "_Maybe jumping on the "release train" is right for you or maybe sticking to
+> LTS is, but making a big commitment to either right now, based on
+> speculation, is neither wise nor necessary._" --- /u/pron98
+
+## Guiding principles
+
+- Reduce unnecessary risk
+    - Big decisions not _necessary_ yet
+    - Community has no experience with new strategy yet
+    - Stay with HotSpot
+- Reduce development and operational overhead
+    - Spend less time on upgrades
+    - Require less buy-in for upgrading
+    - More toys faster
+- Expect responsible maintenance
+    - Updates regularly, in timely manner
+- Reassess in 2020
+    - Better understanding of impact of new strategy
+    - Expected biggest obstacle: third-party dependencies (i.e. not JDK or JVM)
+
+# Recommendations\
+for next 18 months
+
+## Developers
+
+- Use distro\footnote{If not an option, use AdoptOpenJDK} OpenJDK
+- Build on JDK._LTS_\footnote{Expect to be stuck on Java 8 for a while}
+- Test build on
+    - JDK._LTS_
+    - JDK._stable_
+    - JDK._next_\footnote{\textit{Super} important}\footnote{Also really easy
+      in Travis CI}
+
+## Operations
+
+- Provide JDK._LTS_, JDK._stable_, **and** JDK._next_
+    - Use distro\footnote{If not an option, use AdoptOpenJDK} OpenJDK
+    - For _future option_ of paid support, use Azul Zulu
+- Use JDK._LTS_ in production\footnote{We still have to keep it updated}
+    - Consider shift to per-application JDK\footnote{This may happen
+      automatically as LTO becomes common}
+
+## Avoid
+
+- Oracle JDK in production --- requires license and we don't use commercial
+  support today anyway\footnote{Not because we shouldn't pay but because we
+  don't use what we'd be paying for}
+- Oracle JDK 8 in development --- legal but pointless
+- Oracle OpenJDK 8 in development --- legal but pointless
+- Oracle OpenJDK in production --- legal but irresponsible
+- Neglecting JDK in production
+- Relying on `--release=<platform JDK>`\footnote{We still need to specify it}
+  --- too superficial guarantees
+- JDK._stable_ in production --- third-party dependencies could trip us up
+
+# New release strategy
+
+## Versioning
+
+- Java language: \$FEATURE.0.\$UPDATE (e.g. 11.0.1)
+- Java SE runtime: \$YEAR.\$MONTH (e.g. 18.10)
+- JRE: superseded by LTO via `jlink`
+- No more "major" versions
+
+## Release plan
+
+- Feature release every 6 months, starting March 2018
+    - Features get updates for 6 months
+- Update release every 3 months, starting January 2018
+    - I.e. 2 updates per feature
+- LTS feature release every 3 years, starting September 2018
+
+## "Long-term" support
+
+- "Updates available for at least three years, possibly longer"
+    - ... but not from Oracle, unless we pay
+- Feature-to-feature upgrade "easy"
+- LTS-to-LTS upgrade "as difficult as 7-to-8 or 8-to-9"
+
+# New licensing
+
+## OpenJDK by any other name
+
+\center\includegraphics{../media/openjdk.png}
+
+## \href{https://openjdk.java.net/}{Oracle}
+
+- OpenJDK
+    - Gratis in production
+    - No extended update period\footnote{Approximately 1 month to update to new
+      feature release}
+    - No support
+- Oracle JDK
+    - Gratis for development, subscription license for production
+    - Extended update period
+    - Includes support
+
+## \href{https://adoptopenjdk.net/}{AdoptOpenJDK}
+
+- OpenJDK
+    - Gratis in production
+    - Best-effort extended update period
+        - LTS updates by community, probably stewarded by ~~Red Hat~~ IBM
+    - No support
+
+## \href{https://www.azul.com/downloads/zulu/}{Azul}
+
+- Zulu Community
+    - Gratis in production
+    - No extended update period
+    - No support
+- Zulu Enterprise
+    - Extended update period
+        - additional concept of _medium-term_ support
+    - Includes support
+
+## Distro versions
+
+- Comparable to AdoptOpenJDK
+    - ... but be mindful of which _version_ is distributed
+
+## Others
+
+- Basically same story
+
+# _Or else..._
+
+## What if we don't get in line?
+
+- We'll be increasingly vulnerable to exploits
+- People won't want to work for us
+- Alternatively, we'll expose ourselves to litigation
+
+# Summary
+
+## Summary
+
+- Prioritized list of OpenJDK builds, subject to perspective on support need
+    1. Distro OpenJDK
+    1. AdoptOpenJDK
+    1. Azul Zulu or Oracle JDK
+- Build for JDK._LTS_
+- Run on JDK._LTS_
+- Test on JDK._next_
+- Revisit in 12-18 months