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NetBeans Plugin for Scala

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Octocat-spinner-32 libs.local patched scala diff. December 29, 2013
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Octocat-spinner-32 libs.scala.compiler module names of libs. January 06, 2014
Octocat-spinner-32 libs.scala.continuations module names of libs. January 06, 2014
Octocat-spinner-32 libs.scala.library module names of libs. January 06, 2014
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Octocat-spinner-32 libs.scalariform module names of libs. January 06, 2014
Octocat-spinner-32 libs.xtc netbeans.version to RELEASE74 October 23, 2013
Octocat-spinner-32 scala.console find root project recursively. January 04, 2014
Octocat-spinner-32 scala.core EmacsStandard color: fixed color of package names. April 08, 2014
Octocat-spinner-32 scala.debugger.projects Fixed *****.jar is not a valid classpath entry; use a jar-protocol URL. April 01, 2014
Octocat-spinner-32 scala.debugger Upgraded to nbm-maven-pluging 3.9 February 19, 2013
Octocat-spinner-32 scala.editor Minor fixes. April 18, 2014
Octocat-spinner-32 scala.kit skip surefire test until… December 18, 2013
Octocat-spinner-32 scala.maven Extracted scalariform preferences from sbt/maven project setting and March 26, 2014
Octocat-spinner-32 scala.platform Upgraded to nbm-maven-pluging 3.9 February 19, 2013
Octocat-spinner-32 scala.project Debug file in sbt project. December 25, 2013
Octocat-spinner-32 scala.refactoring log more global exceptions. January 06, 2014
Octocat-spinner-32 scala.sbt Tried to fix #110 April 04, 2014
Octocat-spinner-32 scala.stdplatform Upgraded to nbm-maven-pluging 3.9 February 19, 2013
Octocat-spinner-32 .gitignore Add .swp to ignored file list August 14, 2011
Octocat-spinner-32 Increment versions of scala-debug-project/scala-sbt to April 01, 2014
Octocat-spinner-32 nbactions.xml Maven 3.0 Support, split of used Scala binaries into 3 separate modules August 14, 2011
Octocat-spinner-32 pom.xml Increment versions of scala-debug-project/scala-sbt to April 01, 2014

NetBeans Plugin for Scala


  1. Common Informations
    1. Where to start?
    2. Community
    3. Snapshot Builds
  2. Build Instructions
  3. Project Details

Common Informations

This is a plugin of the Netbeans Platform for the scala language. In the case of a maven scala project, no local installation of scala is needed. It enables syntax checking, syntax highlighting, auto-completion, pretty formatter, occurrences mark, brace matching, indentation, code folding, function navigator, go to declaration, project management and a shell console. It's is specially useful if you are a maven user.

Where to start ?

The project central point is There are some other places, where the project was hosted before, but they are abandoned now.


Until recently, this has mostly been a one man project. Some patches were supplied by different people, but I'm still convinced that it will gather a community soon. For questions and bug reports use the issue tracker. If interested in joining the project, you can write me directly or send patches/pull requests.

Where to download

Released builds can be found here Choose proper folder which begins with NetBeans version number then followed supported Scala version. If I have time, the plugins will also be uploaded to, and may be avaliable via the NetBeans Update Center automatically when it passed verification by NetBeans staffs.


Make sure you don't have an old version installed. (Check your netbeans installation for a 'nbscala' directory: if it exists, delete it.)

  1. Download the latest release at
  2. Extract all files into a directory.
  3. Start Netbeans.
  4. Select Tools -> Plugins -> Downloaded -> Add Plugins...
  5. Select all extracted files.
  6. Accept the license and the installation of unsigned plugins.

Build Instructions

Cause of the small group of people involved in the project we only supply updates for the latest netbeans version.

Requirement - Run:

  • Java 1.6+
  • NetBeans 7.4+

Requirement - Build:

  • Java 1.7 (for master branch)
  • Java 1.6 (for 2.9.x branch)
  • Maven 2.x/3.x
  • NetBeans 7.4+


  • master -- tracking Scala 2.10.x currently
  • 2.9.x -- for Scala 2.9.x

Setting nb.installation property for maven

Hint: This is going to be removed in the future. There is already a nbm-application based subproject which can be used to run all modules of the plugin. See the for more information, what is still missing.

Make a new copy of your installed NetBeans (which will be used to run 'mvn nbm:run-ide' goal), check if there is a directory 'nbscala' under this copy, if yes, delete it. Then set 'nb.installation' property in your maven settings.xml (.m2/settings.xml) to point to this copy:


Set system environment variable for building.


or even more:

MAVEN_OPTS=-Xss8M -Xmx1024M

Build all nbms

cd nbscala
mvn clean install

Generate auto-update site:

cd nbscala
mvn nbm:autoupdate

the nbms and update site can be found at nbscala/target/netbeans_site

Run/Debug ide:

cd nbscala
mvn nbm:cluster

To run:

mvn nbm:run-ide

To debug:

mvn nbm:run-ide -Pdebug-ide

Build-Run-Cycle: (after changed module was successfuly built)

mvn nbm:cluster nbm:run-ide

Build-Debug-Cycle: (after changed module was successfuly built)

mvn nbm:cluster nbm:run-ide -Pdebug-ide

Publish to

Generate keys/keystore (note: The keystore and key password needs to be the same):

keytool -genkey -dname "CN=Caoyuan Deng, OU=nbscala,, L=Richmond, S=BC, C=CA" -alias nbscala -validity 1800
keytool -list -v

Enable signing modules by adding all three keystore related parameters in ~/m2/settings.xml as:


Pack a zip file for

mvn nbm:autoupdate
cd target/netbeans_site
zip *.nbm

Installation Notes:

  • After installation, it's always better to restart NetBeans
  • You may need to delete NetBeans' old cache to get improved features working. To find the cache location, read the netbeans.conf at:


Project Details

The Project targets version 2.10.x of the scala release.

Scala Console Integration

A new Scala shell console was implemented recently (since Feb 27, 2013)

To open it, right click on project, and choose "Open Scala Console"


  • Be aware of project's classpath that could be imported, new, run under console
  • Popup auto-completion when press <tab>
  • Applied also to Java SE projects and Maven projects

Sbt Integration

Only Scala-2.10+ is supported under NetBeans

  • That is, always try to set your project's Scala version to 2.10+ in Build.scala or build.sbt:

    scalaVersion := "2.10.0"

Supported features

  • Recognize sbt project and open in NetBeans
  • Open sbt console in NetBeans (Right click on sbt project, choose "Open Sbt")
  • Jump to/Open compile error lines

How to

  • Install the newest nbscala plugins, download directly or build by yourself on NetBeans 7.4+.
  • Git clone, build and publish-local a NetBeans special sbt plugin (nbsbt-plugin 1.1.2 has been deployed to, that means it will be automatilly resolved when you run sbt):

    git clone
    cd nbsbt
    sbt clean compile publish-local
  • Add nbsbt to your plugin definition file. You can use either the global one at ~/.sbt/0.13/plugins/plugins.sbt or the project-specific one at PROJECT_DIR/project/plugins.sbt

    addSbtPlugin("org.netbeans.nbsbt" % "nbsbt-plugin" % "1.1.2")


Q: NetBeans' response becomes slower after a while.

A: Edit your NetBeans configuration file (NetBeansInstallationPlace/etc/netbeans.conf), add -J-Xmx1024M (or bigger)

Q: How to navigate sbt project's dependency sources.

A: From version 1.6.3, this plugin supported to open ivy's sources jar. You may need to have sbt download the dependency's sources, please see

Q: I got:

[error] sbt.IncompatiblePluginsException: Binary incompatibility in plugins detected.

A: Try to remove published nbsbt plugin from your local .ivy2 repository and sbt plugins cache:

rm -r ~/.ivy2/local/org.netbeans.nbsbt
rm -r ~/.sbt/plugins/target

and redo 'publish-local' for the NetBeans sbt plugin

Q: I got:

[error] Not a valid command: netbeans
[error] Expected '/'
[error] Expected ':'
[error] Not a valid key: netbeans (similar: test, tags, streams)
[error] netbeans
[error]         ^

A: Try to remove the project/target folder under your project base directory, there may be something cached here, and was not reflected to the newest condition.

Q: What will this plugin do upon my project?

A: It will generate a NetBeans project definition file ".classpath_nb" for each project.

Q: It seems there are some suspicious error hints displayed on the edited source file, how can I do?

A: There may be varies causes, you can try open another source file, then switch back to this one, the error hints may have disappeared. If not, right click in editing window, choose 'Reset Scala Parser', and try the steps mentioned previous again.

Q: My project's definition was changed, how to reflect these changes to NetBeans.

A: Right click on the root project, choose "Reload Project".

Q: Exiting from Scala console leaves terminal unusable.

A: Under some unix-like environment, scala interactive console started with some stty setting, but not for NetBeans's integrated one. You can try 'reset' after quit from NetBeans.

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