如何在项目中更新 sbt? [英] How can I update sbt in project?

问题描述

我正在学习 Coursera 上关于 Scala 的课程，他们有作业要我做.我下载了项目，里面有 build.sbt .我在终端、Eclipse 和 Idea 中尝试使用 sbt 命令，但没有任何效果.终端中的消息说:

I'm going through course on Coursera about scala, and they have assignments for me to do. I downloaded project and there is build.sbt in it. I tried with sbt command in terminal, Eclipse and Idea, nothing works. Message in terminal says:

[info] Compiling 8 Scala sources to /Users/(Path to project)/project/target/scala-2.9.2/sbt-0.12/classes...
[error] error while loading CharSequence, class file '/Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home/jre/lib/rt.jar(java/lang/CharSequence.class)' is broken
[error] (bad constant pool tag 18 at byte 10)
[error] error while loading Comparator, class file '/Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home/jre/lib/rt.jar(java/util/Comparator.class)' is broken
[error] (bad constant pool tag 18 at byte 20)
[error] error while loading AnnotatedElement, class file '/Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Contents/Home/jre/lib/rt.jar(java/lang/reflect/AnnotatedElement.class)' is broken
[error] (bad constant pool tag 18 at byte 76)
[error] /Users/(Path to project)/project/ScalaTestRunner.scala:66: overloaded method value replace with alternatives:
[error]   (java.lang.CharSequence,java.lang.CharSequence)java.lang.String <and>
[error]   (Char,Char)java.lang.String
[error]  cannot be applied to (java.lang.String, java.lang.String)
[error]   private def runPathString(file: File) = file.getAbsolutePath().replace(" ", "\\ ")
[error]                                                                  ^
[error] four errors found
[error] (compile:compile) Compilation failed

据我了解 sbt 0.12 使用 scala 2.9.2，它不能正确处理 Java 1.8.当然，降级java是可行的，但这不是解决方案，因为我需要Java 1.8.我已经安装了最新的sbt和scala，但是我觉得这个项目有他自己的sbt什么的.所以，我需要的是专门为这个项目升级 sbt 或降级 java.第二个更受欢迎，因为我担心升级 sbt 会导致我的工作在他们的服务器上失败.我是这方面的新手，所以，如果我说了一些非常愚蠢的话，对不起.

As I understand sbt 0.12 using scala 2.9.2, that doesn't handle Java 1.8 correctly. Of course, downgrading java works, but it's not a solution, because I need Java 1.8. I have installed latest sbt and scala, but I think this project has his own sbt, or something. So, what I need is upgrade sbt or downgrade java specifically for this project. Second is more preferred, because I'm afraid upgrading sbt can result my work to fail on their servers. I'm a very newbee at this so, if I said something very stupid, sorry.

推荐答案

嘿，其实很简单，如果你知道该怎么做.只需在项目目录中创建 .javaversion 文件(或以上，据我所知，它首先在目录树中搜索)并用 oracle64-1.7.0.76 填充它，或者任何你想.此外，有一个很好的插件，可以让它变得更容易.

Heh, that what was actually very easy, if you know what to do. Just create .javaversion file in project directory (or above, as I understand, it searches first in dirs tree) and fill it with oracle64-1.7.0.76, or any you want. Also, there is nice plugin to make it even more easy.

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