5 ms·

Scala 2.12.0-RC1 released

59 points by pedrorijo91 10y ago

wiradikusuma 10y ago
too bad they require JDK8 while App Engine supports only JDK7 :(
- cel1ne 10y ago
  Try https://kotlinlang.org/ https://kotlinlang.org/. It works with JDK 6+.
  - justinhj 10y ago
    Scala 2.11 also supports 6
- pas 10y ago
  What does this mean? They probably require JDK8 for compiling/building the class files, but can you target 1.7? See target flag for javac ( http://stackoverflow.com/a/21206909 http://stackoverflow.com/a/21206909 )
  - Nullabillity 10y ago
    AFAIK no, 2.12 does a lot to be compatible with equivalent native features of JVM 8. The way to target JVM 7 bytecode is to stick with Scala 2.11.
  - deleted 10y ago
    [deleted]
  - pjmlp 10y ago
    You can only make use of the target flag when not making use of new bytecodes oder APIs introduced in a specific Java version. Scala 2.12 is replacing some of their own code with Java 8 new features, so they rely on a Java 8 compatible JVM. This will also prevent Scala 2.12 to target Android, because even Android N isn't 100% Java 8 compatible, specially the low level JVM features like invokedynamic and method handles are not supported on DEX format.
- adriaanm 10y ago
  True Scala 2.12 generates byte code that requires a Java 8 VM. Scala 2.11 will be supported for a while longer, with as many as the 2.12 features implemented there first (those that don't require Java 8).
- pedrorijo91 10y ago
  doesn't the Flexible Environment fit for you? https://cloud.google.com/appengine/docs https://cloud.google.com/appengine/docs
  - wiradikusuma 10y ago
    i haven't explored it, but from cursory look it's more "work" (and more expensive) than the one that comes out-of-the-box
- melling 10y ago
  Java 8 was released almost 2.5 years ago. How long should they have to wait before they can use it? Java 9 was originally suppose to be released about now.
adriaanm 10y ago
Keen eye! The release is tagged and the artifacts are indeed on maven central, but we are holding the official announcement for a few days to be able to launch with a nice set of community libraries already published. So much for flying under the radar :-)
walkingolof 10y ago
Here is the 2.12 roadmap http://www.scala-lang.org/news/2.12-roadmap http://www.scala-lang.org/news/2.12-roadmap
virtualwhys 10y ago
Great. What's the status on performance slowdown wrt to relying on Java 8 default methods in 2.12[1]? Hopefully this is not a JVM limitation[2] and can be sorted out during the RC cycle. Fewer generated class files and improved performance would very much be a nice-to-have. [1] http://www.scala-lang.org/blog/2016/07/08/trait-method-performance.html http://www.scala-lang.org/blog/2016/07/08/trait-method-perfo... [2] https://bugs.openjdk.java.net/browse/JDK-8161334 https://bugs.openjdk.java.net/browse/JDK-8161334
- PartOSolution25 10y ago
  The blog entry doesn't mention the impact of that performance regression on Scala 3 (aka Dotty).
  - virtualwhys 10y ago
    Sure, but Dotty is like hindsight, (arriving the year) 2020. Regardless, there's a significant performance regression to sort out prior to the 2.12 GA. If it is a JVM limitation it won't be solved until at least Java 9 (according to the fix version listed in the bug report), which will mean 2.12 loses one of the stated goals of the release: reduction in number of generated class files (with perhaps slightly faster build times). Anyway, we'll see in the coming weeks/months if a resolution or workaround manifests.

59 points by pedrorijo91 10y ago

wiradikusuma 10y ago

too bad they require JDK8 while App Engine supports only JDK7 :(

cel1ne 10y ago
Try https://kotlinlang.org/ https://kotlinlang.org/. It works with JDK 6+.
- justinhj 10y ago
  Scala 2.11 also supports 6
pas 10y ago
What does this mean? They probably require JDK8 for compiling/building the class files, but can you target 1.7? See target flag for javac ( http://stackoverflow.com/a/21206909 http://stackoverflow.com/a/21206909 )
- Nullabillity 10y ago
  AFAIK no, 2.12 does a lot to be compatible with equivalent native features of JVM 8. The way to target JVM 7 bytecode is to stick with Scala 2.11.
- deleted 10y ago
  [deleted]
- pjmlp 10y ago
  You can only make use of the target flag when not making use of new bytecodes oder APIs introduced in a specific Java version. Scala 2.12 is replacing some of their own code with Java 8 new features, so they rely on a Java 8 compatible JVM. This will also prevent Scala 2.12 to target Android, because even Android N isn't 100% Java 8 compatible, specially the low level JVM features like invokedynamic and method handles are not supported on DEX format.
adriaanm 10y ago
True Scala 2.12 generates byte code that requires a Java 8 VM. Scala 2.11 will be supported for a while longer, with as many as the 2.12 features implemented there first (those that don't require Java 8).
pedrorijo91 10y ago
doesn't the Flexible Environment fit for you? https://cloud.google.com/appengine/docs https://cloud.google.com/appengine/docs
- wiradikusuma 10y ago
  i haven't explored it, but from cursory look it's more "work" (and more expensive) than the one that comes out-of-the-box
melling 10y ago
Java 8 was released almost 2.5 years ago. How long should they have to wait before they can use it? Java 9 was originally suppose to be released about now.

adriaanm 10y ago

Keen eye! The release is tagged and the artifacts are indeed on maven central, but we are holding the official announcement for a few days to be able to launch with a nice set of community libraries already published. So much for flying under the radar :-)

walkingolof 10y ago

Here is the 2.12 roadmap http://www.scala-lang.org/news/2.12-roadmap http://www.scala-lang.org/news/2.12-roadmap

virtualwhys 10y ago

Great. What's the status on performance slowdown wrt to relying on Java 8 default methods in 2.12[1]? Hopefully this is not a JVM limitation[2] and can be sorted out during the RC cycle. Fewer generated class files and improved performance would very much be a nice-to-have. [1] http://www.scala-lang.org/blog/2016/07/08/trait-method-performance.html http://www.scala-lang.org/blog/2016/07/08/trait-method-perfo... [2] https://bugs.openjdk.java.net/browse/JDK-8161334 https://bugs.openjdk.java.net/browse/JDK-8161334

PartOSolution25 10y ago
The blog entry doesn't mention the impact of that performance regression on Scala 3 (aka Dotty).
- virtualwhys 10y ago
  Sure, but Dotty is like hindsight, (arriving the year) 2020. Regardless, there's a significant performance regression to sort out prior to the 2.12 GA. If it is a JVM limitation it won't be solved until at least Java 9 (according to the fix version listed in the bug report), which will mean 2.12 loses one of the stated goals of the release: reduction in number of generated class files (with perhaps slightly faster build times). Anyway, we'll see in the coming weeks/months if a resolution or workaround manifests.