scala 2.9.1 控制台中的 '：javap' 命令需要 'classpath' 中的工具.jar(来自 JDK6(。从cmd行可以使用"-cp"参数或CLASSPATH环境变量来完成。
如何对使用"控制台"和"控制台快速"命令从 SBT 调用的 scala 控制台执行相同的操作？
长答案，这可能会在其他地方对您有所帮助。
如果我想了解SBT中的某些内容，我inspect：
> inspect console
[info] Task: Unit
[info] Description:
[info] Starts the Scala interpreter with the project classes on the classpath.
[info] Provided by:
[info] {file:/home/dcs/github/anti-xml/}default-39679a/compile:console
[info] Dependencies:
[info] compile:compilers(for console)
[info] compile:full-classpath
[info] compile:scalac-options(for console)
[info] compile:initial-commands(for console)
[info] compile:streams(for console)
[info] Delegates:
[info] compile:console
[info] *:console
[info] {.}/compile:console
[info] {.}/*:console
[info] */compile:console
[info] */*:console
[info] Related:
[info] test:console
好的，compile:full-classpath中有一个有趣的依赖关系。我希望它是compile:full-classpath(for console)，但事实并非如此。不过，在这种情况下，它不应该给我带来麻烦。让我们inspect一下。
> inspect compile:full-classpath
[info] Task: scala.collection.Seq[sbt.Attributed[java.io.File]]
[info] Description:
[info] The exported classpath, consisting of build products and unmanaged and managed, internal and external dependencies.
[info] Provided by:
[info] {file:/home/dcs/github/anti-xml/}default-39679a/compile:full-classpath
[info] Dependencies:
[info] compile:exported-products
[info] compile:dependency-classpath
[info] Reverse dependencies:
[info] compile:console
[info] Delegates:
[info] compile:full-classpath
[info] *:full-classpath
[info] {.}/compile:full-classpath
[info] {.}/*:full-classpath
[info] */compile:full-classpath
[info] */*:full-classpath
[info] Related:
[info] compile:full-classpath(for doc)
[info] test:full-classpath
[info] test:full-classpath(for doc)
[info] *:full-classpath(for console)
[info] runtime:full-classpath
[info] compile:full-classpath(for console)
好的，我可以进一步了解依赖项，但我认为没有必要。让我们看看里面有什么：
> show compile:full-classpath
[warn] Credentials file /home/dcs/.ivy2/.credentials does not exist
[info] List(Attributed(/home/dcs/github/anti-xml/target/scala-2.9.1/classes), Attributed(/home/dcs/.sbt/boot/scala-2.9.1/lib/scala-library.jar))
[success] Total time: 0 s, completed Dec 7, 2011 3:49:30 PM
好吧，没有什么意外。让我们添加tools.jar.
要更改某些内容，我必须使用set，并且我必须尊重一堆骆驼大小写和其他规则才能使其正常工作。如果我有compile:full-classpath(for console)，那会变成fullClasspath in Compile in console。注意Compile中的大写字母，full-classpath变成了fullClasspath，以及元素名称的一般重新排序。详情请见此处。
我认为人们应该能够获取show的输出(或者至少是inspect(并将其直接反馈给set，但事实并非如此(无论如何，目前(，所以只需学习这些转换规则。
我不想重新键入所有内容，只需添加一个 JAR 文件。我需要为此使用+=。可以在此处找到用于更改事物的运算符。
类路径似乎需要一些Attributed的东西。在 SBT wiki 中查看 Classpath 上的详细文档，并弄清楚如何提出一个文档。幸运的是，我可能想要更改的大多数值并不像这个值那样难以创建。
> set fullClasspath in Compile += Attributed.blank(file("/usr/lib/jvm/java-6-sun-1.6.0.26/lib/tools.jar"))
[info] Reapplying settings...
[info] Set current project to anti-xml (in build file:/home/dcs/github/anti-xml/)
似乎已经奏效了。让我们show它的内容来确认，因为即使写compile而不是Compile也可能让它改变错误的东西。
> show compile:full-classpath
[warn] Credentials file /home/dcs/.ivy2/.credentials does not exist
[info] List(Attributed(/home/dcs/github/anti-xml/target/scala-2.9.1/classes), Attributed(/home/dcs/.sbt/boot/scala-2.9.1/lib/scala-library.jar), Attributed(/usr/lib/jvm/java-6-sun-1.6.0.26/lib/tools.jar))
[success] Total time: 0 s, completed Dec 7, 2011 3:50:07 PM
是的，就是这样。让我们测试一下：
> console
[warn] Credentials file /home/dcs/.ivy2/.credentials does not exist
[info] Starting scala interpreter...
[info]
import com.codecommit.antixml._
bookstore: com.codecommit.antixml.Elem = <bookstore><book><title>For Whom the Bell Tolls</title><author>Hemmingway</author></book><book><title>I, Robot</title><author>Isaac Asimov</author></book><book><title>Programming Scala</title><author>Dean Wampler</author><author>Alex Payne</author></book></bookstore>
books: com.codecommit.antixml.Zipper[com.codecommit.antixml.Elem] = <book><title>For Whom the Bell Tolls</title><author>Hemmingway</author></book><book><title>I, Robot</title><author>Isaac Asimov</author></book><book><title>Programming Scala</title><author>Dean Wampler</author><author>Alex Payne</author></book>
Welcome to Scala version 2.9.1.final (Java HotSpot(TM) 64-Bit Server VM, Java 1.6.0_26).
Type in expressions to have them evaluated.
Type :help for more information.
scala> :javap com.codecommit.antixml.Elem
Compiled from "node.scala"
public class com.codecommit.antixml.Elem extends java.lang.Object implements com.codecommit.antixml.Node,com.codecommit.antixml.Selectable,scala.ScalaObject,scala.Product,scala.Serializable{
public static final scala.Function1 tupled();
public static final scala.Function1 curry();
public static final scala.Function1 curried();
public static final boolean isValidName(java.lang.String);
public scala.collection.Iterator productIterator();
public scala.collection.Iterator productElements();
public java.lang.Object $bslash(com.codecommit.antixml.Selector, com.codecommit.antixml.CanBuildFromWithZipper);
public java.lang.Object $bslash$bslash(com.codecommit.antixml.Selector, com.codecommit.antixml.CanBuildFromWithZipper);
public java.lang.Object $bslash$bslash$bang(com.codecommit.antixml.Selector, com.codecommit.antixml.CanBuildFromWithZipper);
public java.lang.Object select(com.codecommit.antixml.Selector, com.codecommit.antixml.CanBuildFromWithZipper);
public com.codecommit.antixml.Zipper toZipper();
public scala.Option prefix();
public java.lang.String name();
public com.codecommit.antixml.Attributes attrs();
public scala.collection.immutable.Map scope();
public com.codecommit.antixml.Group children();
public com.codecommit.antixml.Elem canonicalize();
public java.lang.String toString();
public com.codecommit.antixml.Group toGroup();
public com.codecommit.antixml.Group copy$default$5();
public scala.collection.immutable.Map copy$default$4();
public com.codecommit.antixml.Attributes copy$default$3();
public java.lang.String copy$default$2();
public scala.Option copy$default$1();
public com.codecommit.antixml.Elem copy(scala.Option, java.lang.String, com.codecommit.antixml.Attributes, scala.collection.immutable.Map, com.codecommit.antixml.Group);
public int hashCode();
public boolean equals(java.lang.Object);
public java.lang.String productPrefix();
public int productArity();
public java.lang.Object productElement(int);
public boolean canEqual(java.lang.Object);
public com.codecommit.antixml.Elem(scala.Option, java.lang.String, com.codecommit.antixml.Attributes, scala.collection.immutable.Map, com.codecommit.antixml.Group);
}
成功！！！
当然，这次会议是谎言。我花了更长的时间才到达那里，但这主要是练习。
https://github.com/ensime/ensime-server/blob/master/build.sbt#L35
// epic hack to get the tools.jar JDK dependency
val JavaTools = List[Option[String]] (
// manual
sys.env.get("JDK_HOME"),
sys.env.get("JAVA_HOME"),
// osx
try Some("/usr/libexec/java_home".!!.trim)
catch {
case _: Throwable => None
},
// fallback
sys.props.get("java.home").map(new File(_).getParent),
sys.props.get("java.home")
).flatten.map { n =>
new File(n + "/lib/tools.jar")
}.find(_.exists).getOrElse (
throw new FileNotFoundException (
"""Could not automatically find the JDK/lib/tools.jar.
|You must explicitly set JDK_HOME or JAVA_HOME.""".stripMargin
)
)