未找到 javac1.8 类 [英] javac1.8 class not found

问题描述

我已经安装了两个 jdk - jdk 1.5 和 jdk 1.8.我有以下 Ant build.xml 配置文件:

I have installed two jdks - jdk 1.5 and jdk 1.8. I have following Ant build.xml config file :

<target name="compileCustomSrc">
    <javac srcdir="src" destdir="build/classes" source="1.5" target="1.5" >
        <classpath>
            <fileset dir="C:/lib/">
                <include name="*.jar" />
            </fileset>
        </classpath>
    </javac>
</target>

在安装 jdk1.8 之前，从 Eclipse 调用 Ant 编译所有源代码成功.但是现在，我有以下错误消息:

Before installing jdk1.8, Ant invoked from Eclipse compiled all sources successful. But now, I have following error message:

Class not found: javac1.8

我的 JAVA_HOME 和 JRE_HOME:

My JAVA_HOME and JRE_HOME:

JAVA_HOME = C:\Program Files (x86)\Java\jdk1.5.0_16
JRE_HOME = C:\Program Files (x86)\Java\jre1.5.0_16

并在 Eclipse JRE 中设置为 1.5.Java 1.8 在安装过程中是否设置了一些配置?

and set in Eclipse JRE to 1.5. Does Java 1.8 set some configs during installation?

推荐答案

Class not found: javac1.8

已知此错误发生在低于 1.9.0 的 Apache Ant 版本 - 与 Java 8 不兼容.如果您使用的是 Ant <1.9.0，您应该更新到 1.9.x 版本.

This error is known to happen with Apache Ant versions less than 1.9.0 - which aren't compatible with Java 8. If you're using a version of Ant < 1.9.0, you should update to a 1.9.x release.

这是相关的错误报告:https://issues.apache.org/bugzilla/show_bug.cgi?id=53347

顺便说一句，如果您只想使用 Java 8 进行编译，但不需要编译任何实际的 Java 8 语法，那么您可以将以下参数作为 解决方法 传递给 javac，这将允许您继续使用旧版本的 Ant:

Btw, if you just want to compile with Java 8, but don't need to compile any actual Java 8 syntax, then you can pass the following argument to javac as a workaround, which would allow you to continue using an older version of Ant:

-Dbuild.compiler=javac1.7

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