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To develop on Daffodil using Eclipse, you will need Eclipse with the Scala IDE add-ins. Versions from 4.5 (Mars) seem to work acceptablyThe ScalaIDE add-ins are not being maintained however (as of 2021-02-01), and latest version of them is from 2018. However, the ScalaIDE does still work quite well with Daffodil.

• Downloading the entire ScalaIDE 4.7 (pre-built) works reliably.
• Loading the ScalaIDE from the update site has been unreliable at creating a real working environment.
  • Specifically: Eclipse 20-12 does not  work with the ScalaIDE update site for ScalaIDE 4.7.

You will need the Java SDK (not just the JRE), and Daffodil requires Java 8 (aka 1.8) at least.

The ScalaIDE 4.7 also requires Java 8 (not newer), so Java 8 JDK is a hard requirement.

• If you are also using other JVM versions or want the default Java to be a newer one, then you can setup the eclipse.ini for ScalaIDE to specifically always use the Java 8 installation.
  • See this page: https://wiki.eclipse.org/Eclipse.ini

Setup Eclipse Projects

You will need the sbtEclipse plugin. Version 5.2.4 is known to work.

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For Daffodil 3.0.0 and older:

1. Enable the sbt ecilpse plugin by create the file ~/.sbt/1.0/plugins/plugins.sbt  with the following content

   Code Block
   language scala title plugins.sbt
   addSbtPlugin("com.typesafe.sbteclipse" % "sbteclipse-plugin" % "5.2.4")

   
   

2. Set the DAFFODIL_HOME environment variable to the directory where you have Daffodil checked out. You can run the following, or put it in configureation file like ~/.bashrc
   

   Code Block
   export DAFFODIL_HOME="/path/to/daffodil.git"

   
   

3. Run the following sbt command to generate eclipse project files:
   

   Code Block
   sbt updateClassifiers compile eclipse updateEclipseClasspaths

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1. 
   

For Daffodil 3.1.0 and newer:

1. Run the following sbt command to generate eclipse project files:

   Code Block
   sbt updateClassifiers compile eclipse

   
   

For all Daffodil versions:

The above This will create an Eclipse .project, .classpath and .settings within each sub-project.

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1. First turn off automatic build
   1. Project menu at top, ensure "Build Automatically" is unchecked.
2. Import all the daffodil projects
   1. File -> Import, Projects from Git, Existing local repository,
   2. select the daffodil directory -> next -> Import existing Eclipse projects -> Next.
   3. All projects should be pre-selected for you. -> Next.
   4. You should now have a collection of project folders displayed in the package explorer.
3. Fix daffodil-lib (This may be unnecessary. Check it, but 'sbt eclipse' seems to set this up properly.)
   
   1. resource_managed/main folder: right-click Build-Path → add as source folder.
   2. src_managed/main folder also add as source folder
4. Fix daffodil-japi: Edit daffodil-japi/.settings/org.scala-ide.sdt.core.prefs
   1. Delete the line that begins with "XPlugin="
   2. Delete the line that begins with "P="
5. Select and refresh all projects.

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