从 Java 运行 Ant 时设置 JAVA_HOME [英] Setting JAVA_HOME when running Ant from Java

问题描述

原因又长又无聊，但我需要运行 Ant 脚本才能从 Java 1.4 应用程序编译 Java 1.5 代码.不过，我不断收到此错误:

The reason is long and boring, but I need to run an Ant script to compile Java 1.5 code from a Java 1.4 app. I keep getting this error, though:

BUILD FAILED

build.xml:16: Unable to find a javac compiler;
com.sun.tools.javac.Main is not on the classpath.
Perhaps JAVA_HOME does not point to the JDK.
It is currently set to "C:j2sdk1.4.2_16jre"

在我的代码中，我有:

Project p = new Project();
p.setUserProperty("ant.file", buildFile.getAbsolutePath());
p.setProperty("java.home", "C:Program FilesJavajdk1.6.0_04");
p.fireBuildStarted();
p.init();
// so on and so forth

但它忽略了它.我也试过 p.setUserProperty(String, String)，但这也不起作用.有没有办法在不启动单独的进程的情况下做到这一点?

but it ignores it. I've also tried p.setUserProperty(String, String), but that doesn't do the trick, either. Is there a way to do it without launching a separate process?

推荐答案

你的构建文件中的 javac 任务有 fork="yes" 吗?如果不是，那么 java.home 属性设置为什么无关紧要；ant 将尝试在同一个 java 进程中调用 javac Main 方法，从你的错误来看，它是一个 JRE，而不是一个 JDK.

Does the javac task in your buildfile have fork="yes"? If not, then it doesn't matter what the java.home property is set to; ant will attempt to call the javac Main method in the same java process, which from your error is a JRE, not a JDK.

EDIT 尝试将 javac 任务的 executable 属性设置为 javac 二进制文件的完整路径并添加 compiler="extJavac" 到任务.

EDIT Try setting the executable property of your javac task to the full path to the javac binary and add compiler="extJavac" to the task.

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