如何在Java模块中指定源和目标兼容性？ [英] How to specify source and target compatibility in Java module?

问题描述

我有一个由Android模块组成的Gradle项目（ com.android.library 插件应用于 build.gradle file）和一个Java模块（在 build.gradle 文件中应用 java 插件）。在Java模块的 build.gradle 文件中，我之前指定了源和目标兼容性如下：

 apply plugin：'java'
 
 compileJava {
 sourceCompatibility = 1.7 
 targetCompatibility = 1.7 
} 
  code> 

我刚刚更新了项目的Android Gradle for Gradle和Gradle Wrapper版本到最新版本（2.2.3和3.2.1），现在我看到Java模块中的警告如下：

 访问'sourceCompatibility'超过其访问权限
访问'targetCompatibility'超出其访问权限
  

如果我将 sourceCompatibility 和 targetCompatibility 声明到模块的 build.gradle
pre $ apply plugin：'java'

sourceCompatibility = 1.7
targ etCompatibility = 1.7


...然后我收到警告消息，告诉我没有使用任务。 / p>

在最新的Gradle版本中指定Java模块的源和目标兼容级别的正确方式是什么？

我认为最后一个（根中的声明）是正确的，它必须正常工作，尽管它会在IDE中引发警告。无处可谈，声明它的最佳方式是什么，并且官方文档，它用作：

  sourceCompatibility = 1.6 
  build.gradle 的根目录下的c $ c> 

。

I have a Gradle project consisting of an Android module (the com.android.library plugin is applied in the build.gradle file) and a Java module (the java plugin is applied in the build.gradle file). Within the build.gradle file of the Java module I was previously specifying the source and target compatibility as follows:

apply plugin: 'java'

compileJava {
    sourceCompatibility = 1.7
    targetCompatibility = 1.7
}

I've just updated the project's "Android Plugin for Gradle" and "Gradle Wrapper" versions to the latest releases (2.2.3 and 3.2.1 respectively) and I'm now seeing warnings in the Java module as follows:

Access to 'sourceCompatibility' exceeds its access rights
Access to 'targetCompatibility' exceeds its access rights

If I move the sourceCompatibility and targetCompatibility declarations to the root-level of the module's build.gradle file as follows...

apply plugin: 'java'

sourceCompatibility = 1.7
targetCompatibility = 1.7

... then I get warning messages telling me that the assignments are not used.

What is the correct manner of specifying the source and target compatibility level of a Java module in the latest Gradle release?

解决方案

I think that the last one(declaration in the root) is the correct one and it has to work properly, though it causes warnings in IDE. It's nowhere said, what is the prefered way to declare it and there is only one example in the official docs, where it's used as:

sourceCompatibility = 1.6

in the root of the build.gradle.

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