如何使用SBT编译Java 8源 [英] How do I compile Java 8 sources with SBT

问题描述

我正在尝试使用SBT 0.13.7使用lambda编译包含一些Java 8源文件的项目. 现在，我设置

I am trying to compile a project containing some Java 8 source files using lambdas using SBT 0.13.7. Now, I set

-java-home /Library/Java/JavaVirtualMachines/jdk1.8.0_25.jdk/Home

在

/usr/local/etc/sbtopts

显然SBT确实考虑了这一点，因为如果我提供了错误的路径，它会抱怨不存在Java.

And apparently SBT does take this into consideration, because if I supply the wrong path it complains about no java being present.

但是，当我尝试编译时，会得到以下内容

However, when I try compiling, I get the following

[error] /Users/edafinov/GitRepos/Java8SBTTest/src/main/java/Main.java:10: error: illegal start of        expression
[error]     new ArrayList<Integer>().stream().filter(i -> i%2 ==0).count();
[error]                                                 ^
[error] 1 error
[error] (compile:compile) javac returned nonzero exit code
[error] Total time: 1 s, completed Dec 26, 2014 12:28:55 PM

这似乎表明SBT不使用javac 1.8，而是使用1.7(这是我的系统的默认值).

This seems to indicate that SBT does not use javac 1.8, but rather the 1.7 one which is the default one for my system.

我在做什么错了?

提前谢谢

推荐答案

显然，如果路径中包含JDK，即使您已显式设置-java-home选项，SBT也会尝试使用该JDK.我通过从$ PATH中删除默认的JDK解决了我的问题

Apparently if you have a JDK in the path, SBT would try to use that one, even when you have explicitly set the -java-home option. I solved my problem by removing the default JDK from $PATH

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