Question

我正在尝试在ANT中构建一个jar.Below是我生成jar文件的代码。我不知道为什么会出现这个错误（“试图覆盖任务javac的旧定义”）。有时它不会生成jar。

<?xml version="1.0" ?> 
<project name="HelloWorld" default="compress">

    <presetdef name="javac">
            <javac includeantruntime="false" />
    </presetdef>

    <target name="init">
        <mkdir dir="build/classes" />
        <mkdir dir="dist" />
    </target>

    <target name="compile" depends="init">
        <javac srcdir="src" destdir="build/classes"/>
    </target>  

    <target name="compress" depends="compile">
            <jar destfile="dist/sample.jar" basedir="build/classes" />

    </target>

    <target name="execute" depends="compile">
        <java classname="src" classpath="build/classes" />
    </target> 

    <target name="clean">

    </target>

</project>

输出如下：

Buildfile: E:\GAD project\project\GAD\build.xml
Trying to override old definition of task javac
init:
    [mkdir] Created dir: E:\GAD project\project\GAD\dist
compile:
compress:
      [jar] Building jar: E:\GAD project\project\GAD\dist\sample.jar
BUILD SUCCESSFUL
Total time: 1 second

让我知道如何纠正错误消息？

Answer 1

试试这个

<presetdef name="my.javac">
            <javac includeantruntime="false" />
    </presetdef>


    <target name="compile" depends="init">
        <my.javac srcdir="src" destdir="build/classes"/>
    </target>

Answer 2

我的build.xml中有以下导入导致问题

<import file="${sdk.dir}/tools/ant/build.xml" />

ANT |试图覆盖任务javac错误的旧定义

2 个答案: