eclipse Ant 中的“无法创建任务或键入 antlib:org.apache.maven.artifact.ant:mvn”错误

"Failed to create task or type antlib:org.apache.maven.artifact.ant:mvn" error in Ant

提问by Lucky

Ant build failed to run while running the ant tasks in build.xml. I got the following error in the console:

在build.xml. 我在控制台中收到以下错误：

Buildfile: F:\Eclipse Projects\my_project\build.xml
  [typedef] Could not load definitions from resource org/apache/maven/artifact/ant/antlib.xml. It could not be found.

BUILD FAILED
F:\my_project\build.xml:32: Problem: failed to create task or type antlib:org.apache.maven.artifact.ant:mvn
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.
No types or tasks have been defined in this namespace yet

This appears to be an antlib declaration. 
Action: Check that the implementing library exists in one of:
        -F:\eclipse\plugins\org.apache.ant_1.8.3.v20120321-1730\lib
        -C:\Users\Lucky\.ant\lib
        -a directory added on the command line with the -lib argument

I placed the maven-ant-tasks jar file in eclipse plugin's folder and in the WinAnt ANT_HOME/lib directory and also included in the classpath. But it didn't solve my problem and this answeralso couldn't solve the issue.

我将 maven-ant-tasks jar 文件放在 eclipse 插件的文件夹和 WinAnt ANT_HOME/lib 目录中，也包含在类路径中。但这并没有解决我的问题，这个答案也无法解决问题。

回答by Lucky

1. Create a libdirectory in the root of your project and place the maven-ant-tasks.jarfile inside it.
2. Include the import statement in your build.xml

1. lib在项目的根目录中创建一个目录，并将maven-ant-tasks.jar文件放入其中。
2. 在您的导入语句中包含 build.xml

<path id="maven-ant-tasks.classpath" path="lib/maven-ant-tasks-2.1.3.jar" />
<typedef resource="org/apache/maven/artifact/ant/antlib.xml" uri="antlib:org.apache.maven.artifact.ant" classpathref="maven-ant-tasks.classpath" />

The above steps solved my issue. Hope this is helpful to someone in the future.

以上步骤解决了我的问题。希望这对将来的某人有所帮助。

Alternate solutions,

替代解决方案，

• You can also place the maven-ant-tasks.jarfile under the ANT_HOME/libfolder to solve this issue.
• Or you could have it under the eclipse plugins folder.
  eg. eclipse\plugins\org.apache.ant_1.8.3.v20120321-1730\lib

• 您也可以将maven-ant-tasks.jar文件放在ANT_HOME/lib文件夹下以解决此问题。
• 或者您可以将它放在 eclipse plugins 文件夹下。
  例如。eclipse\plugins\org.apache.ant_1.8.3.v20120321-1730\lib

回答by DBraga

In my case, i already had the maven-ant-taksk.jar into directory 'eclipse\plugins\org.apache.ant_1.8.3.v20120321-1730\lib'.

就我而言，我已经将 maven-ant-taksk.jar 放入目录 'eclipse\plugins\org.apache.ant_1.8.3.v20120321-1730\lib'.

I'm using eclipse, so what i needed was, go to Ant Runtime on menu Windows > Preferences > Ant > Runtime, select "Ant Home Entries", click on "Ant Home"button e select the Ant home directory

我正在使用 eclipse，所以我需要的是，在菜单 Windows > Preferences > Ant > Runtime 上转到 Ant Runtime，选择"Ant Home Entries"，单击"Ant Home"按钮 e 选择 Ant 主目录

'eclipse\plugins\org.apache.ant_1.8.3.v20120321-1730\lib'

It worked!

有效！