如何以独立于操作系统的方式设置 Gradle `options.bootClasspath`? [英] How to set Gradle `options.bootClasspath` in an os independent manner?

问题描述

因为我的 Java 源代码和目标必须与 JRE 1.6 兼容，所以我需要将 options.bootClasspath 设置为包含 1.6 版本的 rt.jar 和 <代码>jce.jar.它必须在 Windows 和 Unix (Linux/Solaris) 上构建.这样做的正确方法是什么?我现在在我的顶级 build.gradle 中使用以下方法，它有效，但它似乎远非优雅，尤其是依赖于操作系统的分隔符 : 或 ;:

Because my Java sources and targets must be JRE 1.6 compatible, I need to set options.bootClasspath to a path that contains the 1.6 versions of rt.jar and jce.jar. It must build on both Windows and Unix (Linux/Solaris). What is the proper way to do this? I now use the following approach in my top-level build.gradle, it works, but it seems far from elegant, especially the os-dependent separator : or ;:

import org.apache.tools.ant.taskdefs.condition.Os

subprojects {
  apply plugin: 'java'

  compileJava {
    sourceCompatibility = 1.6
    targetCompatibility = 1.6
    def java6_home = System.getenv("JAVA_HOME_6")
    def java6_lib = "C:/localdata/Program Files (x86)/Java/jdk1.6.0_45/jre/lib/"

    if (java6_home != null) {
      java6_lib = java6_home + "/jre/lib/"
    }

    def sep = ':'
    if (Os.isFamily(Os.FAMILY_WINDOWS)) {
      sep = ';'
    }
    options.bootClasspath = java6_lib + "rt.jar" + sep + java6_lib + "jce.jar"
  }
}

推荐答案

我正在使用以下代码(假设 JDK6_HOME 指向 JDK 1.6 安装的根目录):

I am using the following code (assuming the JDK6_HOME points to the root of the JDK 1.6 installation):

tasks.withType(JavaCompile) {
    doFirst {
        if (sourceCompatibility == '1.6' && System.env.JDK6_HOME != null) {
            options.fork = true
            options.bootClasspath = "$System.env.JDK6_HOME/jre/lib/rt.jar"
            options.bootClasspath += "$File.pathSeparator$System.env.JDK6_HOME/jre/lib/jsse.jar"
            // use the line above as an example to add jce.jar 
            // and other specific JDK jars
        }
    }
}

这种方法会自动检测环境变量的存在，并为所有声明 sourceCompatibility 为 1.6 的模块自动设置 bootClasspath.

This approach automatically detects the presence of the environment variable and automatically sets the bootClasspath for all modules that declare sourceCompatibility as 1.6.

当您使用 bootClasspath 时，options.fork = true 是必需的.

The options.fork = true is required when you use bootClasspath.

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