Play Framework 2.6 (Java) environment construction in Eclipse
This is a summary of the procedure for creating a new Play Framework 2.6 (Java) project and importing it into Eclipse. Since the activator command that was used up to v2.5.x has reached EOL, sbt [^ 1] will be used directly after v2.6.x.
Pre-conditions
- Java 1.8 --sbt v0.13.13 or later --Eclipse must be installed
Install sbt with Homebrew for Mac and from here for Windows. Please give me. If sbt is already included, you can check the version with the about option.
$ sbt about
=> [info] This is sbt 1.0.4
Project creation
sbt new [Template name]Create a new project with. You will be asked for the project name and scala version, but if you press enter without entering anything[]The default value in is adopted.
$ sbt new playframework/play-java-seed.g8
[info] Set current project to play (in build file:〜〜〜)
This template generates a Play Java project
name [play-java-seed]:
organization [com.example]:
scala_version [2.12.3]:
play_version [2.6.7]:
sbt_version [1.0.2]:
The app is launched by sbt run, http://localhost:You can check the operation from 9000 (in the case of the first execution, it takes time because the library is dropped).
### Add settings for Eclipse
Added plugin settings to project / plugins.sbt.
#### **`plugins.sbt`**
```sbt
addSbtPlugin("com.typesafe.sbteclipse" % "sbteclipse-plugin" % "5.2.2")
Next, add the settings for Eclipse to build.sbt.
build.sbt
EclipseKeys.preTasks := Seq(compile in Compile, compile in Test)
EclipseKeys.projectFlavor := EclipseProjectFlavor.Java
EclipseKeys.createSrc := EclipseCreateSrc.ValueSet(EclipseCreateSrc.ManagedClasses, EclipseCreateSrc.ManagedResources)
Import into eclipse
Generate .classpath and .project files for Eclipse.
$ sbt eclipse
You can now import it into Eclipse (File> Import> Existing Projects into Workspace). However, in the imported state in this way, Eclipse does not refer to the class generated from view (* .scala.html), so a compile error occurs in Controller. To solve this, set an additional build path.
- Right-click on the project in Eclipse> Build Path> Configure Build Path ...
- Select Add Class Folder from the Library tab
- In the dialog that opens, check target / scala-2.12 / classes and OK
[^ 1]: Build tool for Scala. activator used sbt internally
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