scala - SBT编译的软件包在Scala REPL中无法正常工作(SBT-compiled package not working properly in Scala REPL)

Question

I'm developing a Scala package using an sbt project scheme through IntelliJ.

(我正在通过IntelliJ使用sbt项目方案开发Scala软件包。)

I wanted to use the classes in this package in the Scala REPL, so I followed the instructions in this post .

(我想在这个包在斯卡拉REPL使用类，所以我跟着说明这个职位 。)

Namely,

(即)

1. Navigate to where my package's source files are located (MyProject/src/main/scala/mypackage)

   (导航到我的包的源文件所在的位置（MyProject / src / main / scala / mypackage）)

2. Run "sbt compile"

   (运行“ sbt编译”)

3. Navigate to where sbt stores the compiled source files (MyProject/src/main/scala/mypackage/target/scala-2.12/classes/mytest)

   (导航到sbt存储已编译源文件的位置（MyProject / src / main / scala / mypackage / target / scala-2.12 / classes / mytest）)

4. Run "scala -cp ."

   (运行“ scala -cp”。)

This all works fine until I try to create an instance of one of my package's classes and I get the error MyClass does not have a constructor .

(在我尝试创建包的一个类的实例并且收到错误MyClass does not have a constructor之前，所有方法都工作正常。)

However, if I just paste the class definitions into the Scala REPL, I can create instances with no errors.

(但是，如果仅将类定义粘贴到Scala REPL中，则可以创建没有错误的实例。)

What am I doing wrong here?

(我在这里做错了什么？)

---

As a reproducible example, I created a package mytest with two files TraitOne.scala and ClassOne.scala .

(作为可重现的示例，我使用两个文件TraitOne.scala和ClassOne.scala创建了一个包mytest 。)

The first file looks like

(第一个文件看起来像)

package mytest

trait TraitOne {
  val a: Double
  def aMinus(x: Double): Double = a - x
}

The second file looks like

(第二个文件看起来像)

package mytest

class ClassOne(val a: Double) extends TraitOne {
  def aPlus(x: Double): Double = a + x 
}

If I follow steps 1 - 4 as listed above and write val temp = new ClassOne(1.0) , I get the error ClassOne does not have a constructor .

(如果我按照上面列出的步骤1-4编写val temp = new ClassOne(1.0) ， ClassOne does not have a constructor收到错误ClassOne does not have a constructor 。)

But if I paste

(但是如果我粘贴)

trait TraitOne {
  val a: Double
  def aMinus(x: Double): Double = a - x
}
class ClassOne(val a: Double) extends TraitOne {
  def aPlus(x: Double): Double = a + x 
}

into the REPL, val temp = new ClassOne(1.0) works fine.

(在REPL中， val temp = new ClassOne(1.0)可以正常工作。)

  ask by zack translate from so

Answer 1

Run scala -cp MyProject/src/main/scala/mypackage/target/scala-2.12/classes

(运行scala -cp MyProject/src/main/scala/mypackage/target/scala-2.12/classes)

Don't include the package in classpath

(不要将包包含在类路径中)