[英]Set ant bootclasspath: JDK 1.7 has a new javac warning for setting an older source without bootclasspath
How do I set the ant bootclasspath in conjunction with -source 1.5 -target 1.5? 如何将ant bootclasspath与-source 1.5 -target 1.5一起设置?
How can this not be a hardcoded path to the 1.5 JDK? 这怎么可能不是1.5 JDK的硬编码路径? Can I set an environment variable to bootclasspath similar to how JAVA_HOME can be used from ant? 我可以将环境变量设置为bootclasspath,类似于如何从ant使用JAVA_HOME吗?
Ideally I would like to do something like set an environment variable or pass an argument to ant. 理想情况下,我想做一些事情,例如设置环境变量或将参数传递给ant。
Here's an illustration of how you might fetch the Java 5 boot classes location from an environment variable, then use it. 以下是如何从环境变量中获取Java 5引导类位置,然后使用它的说明。
First, set the environment variable - say JAVA5_BOOTCLASSES
. 首先,设置环境变量 - 比如说JAVA5_BOOTCLASSES
。 The property
task gives you access to the environment, then the bootclasspath
argument of the javac
task passes the setting to the compiler. property
任务使您可以访问环境,然后javac
任务的bootclasspath
参数将设置传递给编译器。
<property environment="env" />
<property name="java5.boot.classpath" value="${env.JAVA5_BOOTCLASSES}" />
<javac source="1.5" target="1.5"
bootclasspath="${java5.boot.classpath}"
...
/>
Note that if the environment variable is not set, Ant will ignore it and proceed without - so the compiler will fall back to the default boot classpath. 请注意,如果未设置环境变量,Ant将忽略它并继续运行 - 因此编译器将回退到默认的引导类路径。
Another option, if appropriate, is to switch off the warnings , and not bother with the bootclasspath. 如果合适,另一个选项是关闭警告 ,而不是打扰bootclasspath。 Something like 就像是
<javac srcdir= ... >
<compilerarg arg="-Xlint:-options" />
</javac>
But that's likely to expose you to some subtle bugs. 但这可能会让你暴露出一些微妙的错误。
It's worth noticing that variable JAVA5_BOOTCLASSES
should contain all needed libraries not just rt.jar. 值得注意的是,变量JAVA5_BOOTCLASSES
应该包含所有需要的库,而不仅仅是rt.jar。 In my case it was also jce.jar So it's good to set this variable using this simple snippet when in *nix environment: 在我的情况下,它也是jce.jar所以在* nix环境中使用这个简单的代码段来设置这个变量是很好的:
export JAVA5_BOOTCLASSES=""
for i in /usr/lib/jvm/java/jre/lib/*.jar; do
export JAVA5_BOOTCLASSES=$JAVA5_BOOTCLASSES:$i
done
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