找不到 taskdef ant 任务 [英] The taskdef ant task cannot be found

问题描述

全部 -

我遵循此页面上最简单的说明:

http://ant.apache.org/manual/develop.html

但是，当我尝试执行目标main"时，在 netbeans 中出现此错误:

<块引用>

taskdef class dec102012.MyAntTask 无法使用类加载器 AntClassLoader[] 找到

但是这个错误没有意义，因为我的扩展Task"的新 Java 类看起来像这样:

包 dec102012;导入 org.apache.tools.ant.BuildException;公共类 MyAntTask 扩展了 org.apache.tools.ant.Task{私人字符串味精；//执行任务的方法public void execute() 抛出 BuildException {System.out.println(msg);}//消息"属性的设置器公共无效setMessage(字符串味精){this.msg = msg;}}

我的 build.xml 中的相关部分如下所示:

<目标名称=主要"><mytask message="Hello World！MyVeryOwnTask 有效！"/></目标>

解决方案

问题是 Ant 类加载器需要知道 *.class 文件所在的位置.

一旦我将 build.xml 更改为如下所示:

<目标名称=主要"><mytask message="Hello World！MyVeryOwnTask 有效！"/></目标>

它起作用了(即它打印出 Hello World 消息).

All -

I'm following the most simplest instructions on this page:

http://ant.apache.org/manual/develop.html

However, when I try to execute the target "main" I get this error in netbeans:

taskdef class dec102012.MyAntTask cannot be found using the classloader AntClassLoader[]

But this error does not make sense because my new Java class that extends "Task" looks like this:

package dec102012;

import org.apache.tools.ant.BuildException;

public class MyAntTask extends org.apache.tools.ant.Task{
    private String msg;

    // The method executing the task
    public void execute() throws BuildException {
        System.out.println(msg);
    }

    // The setter for the "message" attribute
    public void setMessage(String msg) {
        this.msg = msg;
    }
}

The relevant portion in my build.xml looks like:

<taskdef name="mytask" classname="dec102012.MyAntTask" classpath="dec102012"/>

<target name="main">
    <mytask message="Hello World! MyVeryOwnTask works!"/>
</target>

解决方案

The problem is the Ant Classloader needs to know where the *.class file sits.

Once I changed the build.xml to look like:

<taskdef name="mytask" classname="dec102012.MyAntTask" classpath="build/classes"/>

  <target name="main">
    <mytask message="Hello World! MyVeryOwnTask works!"/>
  </target>

it worked (i.e. it printed out the Hello World message).

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