blocks|key|5148988|text|默认情况下，Gradle使用ant任务来构建Scala代码，https://issues.scala-lang.org/browse/SI-8966显示，JVM1.8直到Scala2.11.5才被添加为受支持的目标。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|5148989|您可以通过添加下面的gradle构建文件来尝试使用基于锌的编译器。|5148990|++++tasks.withType(ScalaCompile)+{
++++++scalaCompileOptions.useAnt+=+false
++++}|code-block|syntax|javascript|5148991|您还可能需要将锌编译器添加到依赖项列表中。|5148992|entityMap|0|LINK|mutability|MUTABLE|url|https://issues.scala-lang.org/browse/SI-8966^0|U|18|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|6|7|Y|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|Z|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|10|8|@]|9|@]|C|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

Gradle by default use the ant task to build Scala code, and <a href="https://issues.scala-lang.org/browse/SI-8966" rel="noreferrer">https://issues.scala-lang.org/browse/SI-8966</a> shows that jvm 1.8 was not added as a supported target until Scala 2.11.5.

You can try using the Zinc based compiler with by adding the following the gradle build file.

<pre><code> tasks.withType(ScalaCompile) {
 scalaCompileOptions.useAnt = false
 }
</code></pre>

You may also need to add the zinc compiler to your dependency list.

blocks|key|5149048|text|在Intellij+(15+CE)中，添加此scalac编译器选项：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5149049|构建、执行、部署->编译器->+Scala编译器->默认值|5149050|其他编译器选项：-target:jvm-1.7+(为空)。|offset|length|style|CODE|5149051|也有1级的侧写.使用-target:jvm-1.8，所以我也将它们更改为-target:jvm-1.7。|5149052|我使用Scala2.10，JVM+1.8，源代码兼容性1.7。对我的案子有帮助。|5149053|entityMap^0|0|0|8|F|0|A|F|10|F|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@$F|S|G|T|H|I]]|9|@]|A|$]]|$1|J|3|K|5|6|7|U|8|@$F|V|G|W|H|I]|$F|X|G|Y|H|I]]|9|@]|A|$]]|$1|L|3|M|5|6|7|Z|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|10|8|@]|9|@]|A|$]]]|O|$]]

In Intellij IDEA (15 CE) add this scalac compiler option:

Build, Execution, Deployment -> Compiler -> Scala Compiler -> Default

Additional compiler options: <code>-target:jvm-1.7</code> (was empty).

There were also profiles Gradle 1, ... with <code>-target:jvm-1.8</code>, so I changed them also to <code>-target:jvm-1.7</code>.

I'm using Scala 2.10, JVM 1.8, source compatibility 1.7. It helped in my case.

blocks|key|2820635|text|我使用IntelliJ+2017.2.5w/JRE1.8.0、Scala2.10.5和gradle+3.3获得了相同的错误消息。我通过检查IntelliJ的IDE中的“委托IDE构建/运行操作到分级”复选框(位于|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2820636|Settings>Build，执行，Deployment>Build+Tools>Gradle>Runner|2820637|详细信息可以在这里找到：plugin.html#ideaTargetVersion和https://www.jetbrains.com/help/idea/gradle.html|offset|length|2820638|值得注意的是，我能够在IntelliJ之外构建我的gradle项目(即cmd行)，并且仅在尝试使用IntelliJ+IDE进行构建时才收到此错误。|2820639|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.gradle.org/4.2.1/userguide/scala_plugin.html#ideaTargetVersion|1|https://www.jetbrains.com/help/idea/gradle.html^0|0|0|C|T|0|16|1B|1|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|V|8|@]|9|@$F|W|G|X|1|Y]|$F|Z|G|10|1|11]]|A|$]]|$1|H|3|I|5|6|7|12|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]|R|$5|M|N|O|A|$P|S]]]]

I got the same error message using IntelliJ 2017.2.5 w/ JRE 1.8.0, scala 2.10.5 and gradle 3.3. I solved my problem by checking the "Delegate IDE build/run actions to gradle" checkbox in IntelliJ's IDE located at

Settings>Build,Execution,Deployment>Build Tools>Gradle>Runner

Details can be found here: <a href="https://docs.gradle.org/4.2.1/userguide/scala_plugin.html#ideaTargetVersion" rel="noreferrer">https://docs.gradle.org/4.2.1/userguide/scala_plugin.html#ideaTargetVersion</a> and <a href="https://www.jetbrains.com/help/idea/gradle.html" rel="noreferrer">https://www.jetbrains.com/help/idea/gradle.html</a>

Of note, I was able to build my gradle project outside of IntelliJ (i.e. cmd line) and only received this error on attempting to build using the IntelliJ IDE.

blocks|key|5149007|text|我为这个问题找了很久的解决方案，终于找到了--分享给其他人看。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5149008|摘自：https://devnet.jetbrains.com/message/5523902|offset|length|5149009|subprojects+{
++++tasks.withType(ScalaCompile)+{
++++++++sourceCompatibility+=+"1.7"
++++++++targetCompatibility+=+"1.7"
++++}
}|code-block|syntax|javascript|5149010|entityMap|0|LINK|mutability|MUTABLE|url|https://devnet.jetbrains.com/message/5523902^0|0|3|18|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@$D|U|E|V|1|W]]|A|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

I was searching for a solution for this for ages, finally found it - sharing for anyone else reading this.

Taken from: <a href="https://devnet.jetbrains.com/message/5523902" rel="noreferrer">https://devnet.jetbrains.com/message/5523902</a>

<pre><code>subprojects {
 tasks.withType(ScalaCompile) {
 sourceCompatibility = "1.7"
 targetCompatibility = "1.7"
 }
}
</code></pre>

blocks|key|2325338|text|如果您使用JDK1.8作为您的IntelliJ项目SDK，那么默认的项目语言级别和源代码兼容性可能设置为版本8。这也将反映在IntelliJ的Scala编译器设置中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2325339|要覆盖默认的Java+8语言级别，只需要在build.gradle中添加以下内容|offset|length|style|CODE|2325340|sourceCompatibility+=+1.7|code-block|syntax|javascript|2325341|完成之后，让IntelliJ+IDEA再次导入Gradle项目。然后，您应该通过在“设置IntelliJ编译、执行、部署->编译器->+Scala编译器”下面检查，确认该更改是否已被->捕获。|2325342|查看列出的每个模块的附加编译器选项字段，确保它包含-target:jvm-1.7，而不是-target:jvm-1.8。|2325343|在“项目设置->模块”下，您应该看到语言级别现在也设置为7。|2325344|注:将sourceCompatibility属性设置在Gradle属性allprojects、subprojects或使用tasks.withType(ScalaCompile)下对我无效；它必须单独指定才能被拾取。|2325345|(这适用于我使用IntelliJ+IDEA+2017.2.3、Gradle+4.1、Gradle+Scala插件和Scala版本2.10)|2325346|entityMap^0|0|L|C|0|0|0|P|F|18|F|0|0|3|J|Z|B|1B|B|1P|S|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@$D|10|E|11|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|12|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|13|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|14|8|@$D|15|E|16|F|G]|$D|17|E|18|F|G]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|19|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|1A|8|@$D|1B|E|1C|F|G]|$D|1D|E|1E|F|G]|$D|1F|E|1G|F|G]|$D|1H|E|1I|F|G]]|9|@]|A|$]]|$1|U|3|V|5|6|7|1J|8|@]|9|@]|A|$]]|$1|W|3|-4|5|6|7|1K|8|@]|9|@]|A|$]]]|X|$]]

If you're using JDK 1.8 as your IntelliJ Project SDK, then the default project language level and source compatibility may be set to version 8 by default. This will also be reflected in IntelliJ's Scala compiler settings.

To override default Java 8 language level, it was only necessary for me to add the following to my <code>build.gradle</code>:

<pre><code>sourceCompatibility = 1.7
</code></pre>

After doing that, make IntelliJ IDEA import the Gradle project again. You should then confirm that the change has been picked up by IntelliJ by checking under: Settings -> Build, Execution, Deployment -> Compiler -> Scala Compiler

Look at the Additional compiler options field for each of the modules listed and make sure that it contains <code>-target:jvm-1.7</code>, and not <code>-target:jvm-1.8</code>. 

Under Project Settings -> Modules, you should see that the Language Level is now set to 7 too.

N.B. Setting the <code>sourceCompatibility</code> property under the Gradle properties <code>allprojects</code>, <code>subprojects</code> or using <code>tasks.withType(ScalaCompile)</code> did not work for me; it had to be specified separately to be picked up.

(This worked for me using IntelliJ IDEA 2017.2.3, Gradle 4.1, the Gradle Scala plugin and Scala version 2.10)

blocks|key|2325412|text|在我的例子中，我通过删除POM中提到的scala和全局库中导入之间的冲突来解决问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2325413|检查pom.xml中的scala版本，并检查您添加的全局库scala。应该是一样的。|2325414|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

In my case, I have resolved by removing conflict between scala-sdk mentioned in POM and importing in global libraries.

Check scala-sdk version in the pom.xml and also check the global libraries scala-sdk you have added. it should be same.

blocks|key|2325424|text|从阿兰·埃菲里克的答案中添加。JVM+1.8直到Scala2.11.5才被添加为受支持的目标。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2325425|在我的IDE中，Scala版本被选择为2.11.0，将其更新到最新的2.11.12解决了这个问题。|2325426|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Adding from @Alan Effrig's answer.
JVM 1.8 was not added as a supported target until Scala 2.11.5.
In my IDE, Scala version was selected as 2.11.0, updating it to latest 2.11.12 solved the issue.

IntelliJ complains with the following exception when I try to make my project.

<pre><code>Error:scalac: 'jvm-1.8' is not a valid choice for '-target'
Error:scalac: bad option: '-target:jvm-1.8'
</code></pre>

But a 'gradlew clean install' works just fine. 

The project setup is:

gradle version 2.3

scala 2.10 and java

3 of the 4 modules use java 1.7 (source and target compatibility), the 4th module has source and target compatibility 1.8 and is causing the problem.

Any ideas how I can avoid the error? (moving to java 7 is not an option, upgrading scala is)

'jvm-1.8' is not a valid choice for '-target'

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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当我尝试制作我的项目时，IntelliJ会出现以下异常。Error:scalac: 'jvm-1.8' is not a valid choice for '-target'Error:scalac: bad option: '-target:jvm-1.8'但是，“梯度清洁安装”工作得很好。项目设置如下：分级版本2.3scala 2.10和java4个模块中的3个模块使用了Java1.7(源代码

问‘’jvm 1.8‘不是“目标”的有效选择。
EN

回答 7

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问‘’jvm 1.8‘不是“目标”的有效选择。EN

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问‘’jvm 1.8‘不是“目标”的有效选择。
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