因爲沒有找到類，Java ant build失敗

Question

我正在學習Java ant。我在eclipse call hello world中創建了一個項目。然後我做了一個項目導出並創建了一個ant構建文件。當運行失敗的螞蟻文件抱怨：BUILD FAILED C：\用戶** \工作空間\的HelloWorld \ build.xml中：31：沒有發現類別：javac1.8

並指向這一行：

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

我正在使用eclipse kepler。

這裏是我的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> 

有誰知道爲什麼發生這種情況？

Answer 1

您的Ant版本是否低於1.9.0？ 如果是這樣，它與java不兼容8. 您最好更新當前版本的Ant。

如果你不使用任何Java 8語法，只是想用它來編譯，你可以通過「-Dbuild.compiler = javac1.7」到javac的