如何运行使用简单构建工具创建的包？

Question

我运行：

$ echo 'object Hi { def main(args: Array[String]) { println("Hi!") } }' > hw.scala 
$ sbt 
> warn 
Set log level to warn 
> run 
Hi! 
> package 
$ java -jar target/scala_2.7.7/test_2.7.7-1.0.jar 
Exception in thread "main" java.lang.NoClassDefFoundError: scala/ScalaObject 
at java.lang.ClassLoader.defineClass1(Native Method) 
at java.lang.ClassLoader.defineClass(ClassLoader.java:621) 
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124) 
at java.net.URLClassLoader.defineClass(URLClassLoader.java:260) 

为什么我不能运行这个jar包这种方式？

Answer 1

您正试图在没有scala运行时的情况下运行它。无论是使用Scala的可执行文件：

scala -jar target/scala_2.7.7/test_2.7.7-1.0.jar 

，或者斯卡拉jar添加到classpath

java -cp target/scala_2.7.7/test_2.7.7-1.0.jar:$PATH_TO_SCALA_JAR Hi 

Answer 2

我不知道你正在使用的SBT的版本，或者你用什么项目设置，但通常你的hw.scala文件应该放在src/main/scala目录中以便找到它。另外，正如synesso所言，scala运行时似乎不存在。通常sbt只会在创建新项目时下载这些内容。 我只是试图在一个FRES项目中使用SBT 0.7.3，而这个作品：

 
$ sbt 
Project does not exist, create new project? (y/N/s) y 
Name: test 
Organization: test 
Version [1.0]: 
Scala version [2.7.7]: 
sbt version [0.7.3]: 
Getting Scala 2.7.7 ... 
:: retrieving :: org.scala-tools.sbt#boot-scala 
    confs: [default] 
    2 artifacts copied, 0 already retrieved (9911kB/26ms) 
Getting org.scala-tools.sbt sbt_2.7.7 0.7.3 ... 
:: retrieving :: org.scala-tools.sbt#boot-app 
    confs: [default] 
    15 artifacts copied, 0 already retrieved (4023kB/25ms) 
[success] Successfully initialized directory structure. 
[info] Building project test 1.0 against Scala 2.7.7 
[info] using sbt.DefaultProject with sbt 0.7.3 and Scala 2.7.7 

> exit 

$echo 'object Hi { def main(args: Array[String]) { println("Hi!") } }' > src/main/scala/hw.scala 

> sbt 
[info] Building project test 1.0 against Scala 2.7.7 
[info] using sbt.DefaultProject with sbt 0.7.3 and Scala 2.7.7 
> run 
Hi! 

> package 
[info] 
[info] == compile == 
[info] Source analysis: 0 new/modified, 0 indirectly invalidated, 0 removed. 
[info] Compiling main sources... 
[info] Nothing to compile. 
[info] Post-analysis: 2 classes. 
[info] == compile == 
[info] 
[info] == package == 
[info] == package == 
[success] Successful.