使用 ANT 构建时"Build Failed: failed to create task or type classpath"

Question

> BUILD FAILED
> C:Usersdt208672PerforcedepotebillAutomationSelenium_eBillRunningPowerbuild.xml:37:
> Problem: failed to create task or type classpath Cause: The name is
> undefined. Action: Check the spelling. Action: Check that any custom
> tasks/types have been declared. Action: Check that any
> <presetdef>/<macrodef> declarations have taken place.

这是尝试用Apache Ant构建应用程序时的错误。似乎错误与类路径有关。我的程序可以编译，但不能运行。有人告诉我，解决这个问题的方法是在运行时包含类路径，然而，这个问题仍然存在。也许我写的不对?不知道

<?xml version="1.0" ?>
<project name="SeleniumProjectDataDriven" basedir="." default="run">
<target name="init">
    <property name="src.dir" value="src" />
    <property name="build.dir" value="build" />
    <property name="classes.dir" value="${build.dir}/class" />
    <property name="lib.dir" value="RunningPowerJars" />
</target>
<target name="clean" depends="init">
     <delete dir="build"/>
 </target>
<target name="compile" description="Compiles the code" depends="clean" >
    <mkdir dir="${classes.dir}" />
    <javac srcdir="${src.dir}" destdir="${classes.dir}" includeantruntime="false">
        <classpath>
            <fileset dir="${lib.dir}">
                <include name="**/*.jar" />
            </fileset>
        </classpath>
    </javac>
</target>
<target name="jar" description="Packages the code into jar" depends="compile">
    <mkdir dir="build/jar"/>
        <jar destfile="build/jar/RunningPower.jar" basedir="build/class">
            <manifest>
                <attribute name="Main-Class" value="RunningPower"/>
            </manifest> 
        </jar> 
</target>
<target name="run" description="Run the jar file" depends="jar" >
    <java jar="build/jar/RunningPower.jar" fork="true">
        <classpath>
            <fileset dir="${lib.dir}">
            <include name="**/*.jar" /> 
            </fileset> 
        </classpath>
    </java>
</target>

Answer 1

在运行jar文件(<java jar="...")时不能指定<classpath>。

引用java doc:

当您使用-jar选项时，指定的JAR文件是所有用户类的源文件，其他类路径设置将被忽略。