Question

我正在学习Java ant。我在eclipse中创建了一个调用hello world的项目。然后我对项目进行了导出并创建了一个ant构建文件。当我运行ant文件时，它失败了抱怨： BUILD FAILED C：\ Users ** \ workspace \ HelloWorld \ build.xml：31：找不到类：javac1.8

并指向这一行：

<javac debug="true" debuglevel="${debuglevel}" destdir="bin" includeantruntime="false" source="${source}" target="${target}">

我正在使用eclipse kepler。

这是我的build.xml文件：

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!-- WARNING: Eclipse auto-generated file.
              Any modifications will be overwritten.
              To include a user specific buildfile here, simply create one in the same
              directory with the processing instruction <?eclipse.ant.import?>
              as the first entry and export the buildfile again. -->
<project basedir="." default="build" name="HelloWorld">
    <property environment="env"/>
    <property name="debuglevel" value="source,lines,vars"/>
    <property name="target" value="1.2"/>
    <property name="source" value="1.3"/>
    <path id="HelloWorld.classpath">
        <pathelement location="bin"/>
    </path>
    <target name="init">
        <mkdir dir="bin"/>
        <copy includeemptydirs="false" todir="bin">
            <fileset dir="src">
                <exclude name="**/*.java"/>
            </fileset>
        </copy>
    </target>
    <target name="clean">
        <delete dir="bin"/>
    </target>
    <target depends="clean" name="cleanall"/>
    <target depends="build-subprojects,build-project" name="build"/>
    <target name="build-subprojects"/>
    <target depends="init" name="build-project">
        <echo message="${ant.project.name}: ${ant.file}"/>
        <javac debug="true" debuglevel="${debuglevel}" destdir="bin" includeantruntime="false" source="${source}" target="${target}">
            <src path="src"/>
            <classpath refid="HelloWorld.classpath"/>
        </javac>
    </target>
    <target description="Build all projects which reference this project. Useful to propagate changes." name="build-refprojects"/>
    <target name="HelloWorld">
        <java classname="HelloWorld" failonerror="true" fork="yes">
            <classpath refid="HelloWorld.classpath"/>
        </java>
    </target>
</project>

有谁知道为什么会这样？

Answer 1

您的Ant版本是否低于1.9.0？如果是这样，它与java 8不兼容。您最好更新当前版本的Ant。

如果你没有使用任何java 8语法，只想用它编译，你可以将“-Dbuild.compiler = javac1.7”传递给javac

Java ant构建失败，因为找不到类

1 个答案: