sbt/notes/0.13.10.markdown

  [@eed3si9n]: https://github.com/eed3si9n
  [@jsuereth]: https://github.com/jsuereth
  [@dwijnand]: http://github.com/dwijnand
  [@Duhemm]: http://github.com/Duhemm
  [@gkossakowski]: https://github.com/gkossakowski
  [@adriaanm]: https://github.com/adriaanm
  [@jrudolph]: https://github.com/jrudolph
  [@stuhood]: https://github.com/stuhood
  [@pdalpra]: https://github.com/pdalpra
  [@fkorotkov]: http://github.com/fkorotkov
  [@hgiddens]: https://github.com/hgiddens
  [@DavidPerezIngeniero]: https://github.com/DavidPerezIngeniero
  [2302]: https://github.com/sbt/sbt/issues/2302
  [2303]: https://github.com/sbt/sbt/pull/2303
  [1967]: https://github.com/sbt/sbt/issues/1967
  [2085]: https://github.com/sbt/sbt/pull/2085
  [2071]: https://github.com/sbt/sbt/issues/2071
  [2091]: https://github.com/sbt/sbt/pull/2091
  [2092]: https://github.com/sbt/sbt/pull/2092
  [2095]: https://github.com/sbt/sbt/pull/2095
  [2094]: https://github.com/sbt/sbt/pull/2094
  [2112]: https://github.com/sbt/sbt/pull/2112
  [2108]: https://github.com/sbt/sbt/pull/2108
  [2106]: https://github.com/sbt/sbt/pull/2106
  [2041]: https://github.com/sbt/sbt/issues/2041
  [2087]: https://github.com/sbt/sbt/issues/2087
  [2103]: https://github.com/sbt/sbt/pull/2103
  [2107]: https://github.com/sbt/sbt/issues/2107
  [2114]: https://github.com/sbt/sbt/pull/2114
  [2117]: https://github.com/sbt/sbt/pull/2117
  [2109]: https://github.com/sbt/sbt/issues/2109
  [2127]: https://github.com/sbt/sbt/pull/2127
  [14]: https://github.com/sbt/ivy/pull/14
  [2118]: https://github.com/sbt/sbt/issues/2118
  [2137]: https://github.com/sbt/sbt/pull/2137
  [2139]: https://github.com/sbt/sbt/pull/2139
  [2142]: https://github.com/sbt/sbt/pull/2142
  [2155]: https://github.com/sbt/sbt/issues/2155
  [2160]: https://github.com/sbt/sbt/pull/2160
  [2158]: https://github.com/sbt/sbt/pull/2158
  [1681]: https://github.com/sbt/sbt/issues/1681
  [2173]: https://github.com/sbt/sbt/pull/2173
  [JLine2]: https://github.com/jline/jline2
  [2151]: https://github.com/sbt/sbt/pull/2151
  [1750]: https://github.com/sbt/sbt/issues/1750
  [17]: https://github.com/sbt/ivy/pull/17
  [2163]: https://github.com/sbt/sbt/pull/2163
  [18]: https://github.com/sbt/ivy/pull/18
  [2186]: https://github.com/sbt/sbt/pull/2186
  [2197]: https://github.com/sbt/sbt/pull/2197
  [2192]: https://github.com/sbt/sbt/pull/2192
  [2201]: https://github.com/sbt/sbt/pull/2201
  [2214]: https://github.com/sbt/sbt/pull/2214
  [1933]: https://github.com/sbt/sbt/issues/1933
  [2258]: https://github.com/sbt/sbt/pull/2258
  [2228]: https://github.com/sbt/sbt/issues/2228
  [2271]: https://github.com/sbt/sbt/pull/2271
  [2285]: https://github.com/sbt/sbt/pull/2285
  [2256]: https://github.com/sbt/sbt/issues/2256
  [2272]: https://github.com/sbt/sbt/pull/2272
  [1968]: https://github.com/sbt/sbt/issues/1968
  [2264]: https://github.com/sbt/sbt/issues/2264
  [2172]: https://github.com/sbt/sbt/pull/2172
  [2217]: https://github.com/sbt/sbt/issues/2217
  [2336]: https://github.com/sbt/sbt/issues/2336

### Fixes with compatibility implications

- sbt 0.13.10 adds a new setting `useJCenter`, which is set to `false` by default. When set to `true`, JCenter will be placed as the first external resolver to find library dependencies. [#2217][2217] by [@eed3si9n][@eed3si9n]
- sbt will no longer pass `-J<flag>` options to the local Java compiler. [#1968][1968]/[#2272][2272] by [@Duhemm][@Duhemm]

### Improvements

- Scala version used by the build is updated to 2.10.6. [#2311][2311] by [@eed3si9n][@eed3si9n]
- `makePom` warns when it sees intransitive dependencies, which do not translate to Maven. [#2127][2127] by [@jsuereth][@jsuereth]
- Adds `Def.settings`, which facilitates mixing settings with seq of settings. See below.
- Adds configurable compiler bridge. See below.
- sbt Serialization is updated to 0.1.2. [2117][#2117] by [@dwijnand][@dwijnand]
- Hides the stack trace on compilation error in build definition. [#2071][2071]/[#2091][2091] by [@Duhemm][@Duhemm]
- Makes the dummy `Logger.Null` public. [#2094][2094] by [@pdalpra][@pdalpra]
- Uses diagnostic classes to get lines contents in local Java compiler. [#2108][2108]/[#2201][2201] by [@fkorotkov][@fkorotkov]
- Logs javaOptions used when forking. [#2087][2087]/[#2103][2103] by [@pdalpra][@pdalpra]
- Warns when javaOptions are defined but fork is set to false. [#2041][2041]/[#2103][2103] by [@pdalpra][@pdalpra]
- Adds an `Append.Sequence` instance for `List` to allow `+=`/`++=` on `developers` setting. [#2107][2107]/[#2114][2114] by [@pdalpra][@pdalpra]
- Fixes warnings, and other clean ups. [#2112][2112]/[#2137][2137]/[#2139][2139]/[#2142][2142] by [@pdalpra][@pdalpra]
- Adds `localIfFile` to `MavenRepository`, to force artifacts to be copied to the cache. [#2172][2172] by [@dwijnand][@dwijnand]
- Adds `Resolver.bintrayIvyRepo(owner, repo)`. [#2285][2285] by [@dwijnand][@dwijnand]

### Bug fixes

- Fixes the false positive of inconsistent duplicate warnings. [#1933][1933]/[#2258][2258] by
  [@Duhemm][@Duhemm]
- Updated Ivy to merge IVY-1526 fix. [sbt/ivy#14][14]/[#2118][2118] by [@jsuereth][@jsuereth]
- Fixes `updateClassifiers` downloading updated snapshot sources and docs.
  [#1750][1750]/[sbt/ivy#17][17]/[#2163][2163]/[sbt/ivy#18][18]/[#2186][2186] by [@dwijnand][@dwijnand]
- Fixes `updateClassifiers` on Ivy modules without `default` configuration.
  [#2264][2264] by [@eed3si9n][@eed3si9n]/[@Duhemm][@Duhemm]
- Updated [JLine][JLine2] to version 2.13. [#1681][1681]/[#2173][2173]
- Changing the value of a constant (final-static-primitive) field will now
  correctly trigger incremental compilation for downstream classes. This is to
  account for the fact that Java compilers may inline constant fields in
  downstream classes. [#1967][1967]/[#2085][2085] by [@stuhood][@stuhood]
- Fixes classfile location detection. [#2214][2214] by [@stuhood][@stuhood]
- Fixes a few typos in keys descriptions. [#2092][2092] by [@pdalpra][@pdalpra]
- Avoids the use of `ListBuffer#readOnly`. [#2095][2095] by [@adriaanm][@adriaanm]
- Expands transitive dependency exclusions when using sbt-maven-resolver-plugin [#2109][2109] by [@jsuereth][@jsuereth]
- Fixes incremental compilation of traits by including private members into the API hash. [#2155][2155]/[#2160][2160]
- Fixes name hashing error messages. [#2158][2158] by [@stuhood][@stuhood]
- Adds more robustness to `tasks` and `settings` command. [#2192][2192] by [@DavidPerezIngeniero][@DavidPerezIngeniero]
- Fixes Java compilation inconsistencies between sbt and `javac` by always failing if the local Java compiler reported errors. [#2228][2228]/[#2271][2271] by [@Duhemm][@Duhemm]
- Fixes `JavaErrorParser` to parse non-compile-errors [#2256][2256]/[#2272][2272] by [@Duhemm][@Duhemm]

- Fixes task scheduling performance on large builds by skipping checks in `sbt.Execute`. [#2302][2302]/[#2303][2303] by [@jrudolph][@jrudolph]

### Def.settings

Using `Def.settings` it is now possible to nicely define settings as such:

    val modelSettings = Def.settings(
      sharedSettings,
      libraryDependencies += foo
    )

[#2151][2151] by [@dwijnand][@dwijnand]

### Configurable Scala compiler bridge

sbt 0.13.10 adds `scalaCompilerBridgeSource` setting to specify the compiler brigde source. This allows different implementation of the bridge for Scala versions, and also allows future versions of Scala compiler implementation to diverge. The source module will be retrieved using library management configured by `bootIvyConfiguration` task.

[#2106][2106]/[#2197][2197]/[#2336][2336] by [@Duhemm][@Duhemm]