如何使用gradle强制执行java编译器版本？

Question

在我的所有项目中,我使用gradle并指定以下内容:

sourceCompatibility = "1.7"; // for example
targetCompatibility = "1.7"; // defaults to sourceCompatibility

现在,我安装了三个不同版本的JDK,从1.6到1.8.为了从一个版本切换到另一个版本,我source改变了shell文件PATH,JAVA_HOME甚至JDK_HOME.

偶然可能会发生我使用错误的JDK版本而我不希望...在尝试任何编译任务之前是否有可能检查编译器版本是否等于targetCompatibility？

Answer 1

回答自我,感谢@JBNizet提供初始解决方案......

确实要使用解决方案JavaVersion,它发生在两者sourceCompatibility并targetCompatibility接受一个JavaVersion参数......

因此构建文件变为:

def javaVersion = JavaVersion.VERSION_1_7;
sourceCompatibility = javaVersion;
targetCompatibility = javaVersion; // defaults to sourceCompatibility

然后任务:

task enforceVersion << {
    def foundVersion = JavaVersion.current();
    if (foundVersion != javaVersion) 
        throw new IllegalStateException("Wrong Java version; required is "
            + javaVersion + ", but found " + foundVersion);
}

compileJava.dependsOn(enforceVersion);

它有效:

$ ./gradlew clean compileJava
:clean UP-TO-DATE
:enforceVersion FAILED

FAILURE: Build failed with an exception.

* Where:
Build file '/home/fge/src/perso/grappa-tracer-backport/build.gradle' line: 55

* What went wrong:
Execution failed for task ':enforceVersion'.
> Wrong Java version; required is 1.7, but found 1.8

Answer 2

我使用以下内容:

task checkJavaVersion << {
    if (!JavaVersion.current().isJava6()) {
        String message = "ERROR: Java 1.6 required but " +
                          JavaVersion.current() +
                          " found. Change your JAVA_HOME environment variable.";
        throw new IllegalStateException(message);
    }
}

compileJava.dependsOn checkJavaVersion