Scala:Hello World Script不起作用

Question

我正在学习Scala而且我被困在hello world脚本中.

我的hello.scala是:

Console.println("Hello World")  

我正在运行这样的脚本:

scala hello.scala  

我得到一个奇怪的例外:

java.net.UnknownHostException: salil: salil: Name or service not known
    at java.net.InetAddress.getLocalHost(InetAddress.java:1438)
    at scala.tools.nsc.io.Socket$.localhost(Socket.scala:38)
    at scala.tools.nsc.CompileSocket.getsock$1(CompileSocket.scala:169)
    at scala.tools.nsc.CompileSocket.getOrCreateSocket(CompileSocket.scala:184)
    at scala.tools.nsc.ScriptRunner.compileWithDaemon(ScriptRunner.scala:80)
    at scala.tools.nsc.ScriptRunner.compile$1(ScriptRunner.scala:123)
    at scala.tools.nsc.ScriptRunner$$anonfun$withCompiledScript$1.apply$mcZ$sp(ScriptRunner.scala:157)
    at scala.tools.nsc.ScriptRunner$$anonfun$withCompiledScript$1.apply(ScriptRunner.scala:131)
    at scala.tools.nsc.ScriptRunner$$anonfun$withCompiledScript$1.apply(ScriptRunner.scala:131)
    at scala.tools.nsc.util.package$.waitingForThreads(package.scala:26)
    at scala.tools.nsc.ScriptRunner.withCompiledScript(ScriptRunner.scala:130)
    at scala.tools.nsc.ScriptRunner.runScript(ScriptRunner.scala:188)
    at scala.tools.nsc.ScriptRunner.runScriptAndCatch(ScriptRunner.scala:201)
    at scala.tools.nsc.MainGenericRunner.runTarget$1(MainGenericRunner.scala

我的SCALA_HOME是/opt/scala-2.9.1.final
,我的Path里面有$ SCALA_HOME/bin.
我的JAVA_HOME是:/usr/java/jdk1.7.0

这是我的设置的问题还是由于Scala库和JDK1.7的某些问题？

Answer 1

您的主机名似乎无法解析为正确的IP地址,因此scala无法连接到编译器服务.请检查您的/ etc/hosts文件,它应该有如下记录:

127.0.0.1    salil

设置主机名/ IP映射后,可以使用ping salil命令确认设置是否正确.