[hibernate-dev] JDK9 testing

[Sanne Grinovero]

We had several jobs failing on ci.hibernate.org as I had previously
uploaded a "Jigsaw enabled" build of JDK9. Turns out that was a bit
too a daring leap.

I've now replaced it with the latest build JDK 9 b93 "regular", so I
expect most issues to be gone.. I still wish to pursue Jigsaw
compatibility at some point, but let's at least aim at keeping our
projects stable on the regular one as a first step.

There are some goodies in this last build; quoting Rory O'Donnell:

>>>

JEP 254: Compact Strings (http://openjdk.java.net/jeps/254)

This JEP adopts a more space-efficient internal representation for strings.

We propose to change the internal representation of the String class
from a UTF-16 char array to a byte array plus an encoding-flag field.
The new String class will store characters encoded either as
ISO-8859-1/Latin-1 (one byte per character), or as UTF-16 (two bytes
per character), based upon the contents of the string. The encoding
flag will indicate which encoding is used.

JEP 165: Compiler Control (http://openjdk.java.net/jeps/165)

This JEP proposes an improved way to control the JVM compilers. It
enables runtime manageable, method dependent compiler flags.
(Immutable for the duration of a compilation.)

Method-context dependent control of the compilation process is a
powerful tool for writing small contained JVM compiler tests that can
be run without restarting the entire JVM. It is also very useful for
creating workarounds for bugs in the JVM compilers.

JEP 243: Java-Level JVM Compiler Interface (http://openjdk.java.net/jeps/243)

This JEP instruments the data flows within the JVM which are used by
the JIT compiler to allow Java code to observe, query, and affect the
JVM's compilation process and its associated metadata.

JEP 268: XML Catalog API (http://openjdk.java.net/jeps/268)

This JEP develops a standard XML Catalog API that supports the OASIS
XML Catalogs standard, v1.1. The API will define catalog and
catalog-resolver abstractions which can be used with the JAXP
processors that accept resolvers.

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Thanks,
Sanne