[JAVA] How to run Ant in Gradle

You may want to execute the target of Ant build.xml from Gradle, such as when you already have Ant assets in a project using Java.

I've found out how to do that, so I'll spell it out with a note.

Import build.xml

Use the ant.importBuild () method to import.

▼ Prepare one target to echo in build.xml


<?xml version="1.0" encoding="utf-8" ?>

<project name="antsample" default="target01">
    <target name="target01">
        <echo message="message01" />

▼ Import so that build.xml can be used on the build.gradle side


ant.importBuild 'build.xml'

▼ The target defined in build.xml can be used.

$ gradle tasks --all
Other tasks

$ gradle target01
> Task :target01
[ant:echo] message01

1 actionable task: 1 executed

When the target name of Ant and the task name of Gradle are duplicated

As a caveat, if the task name prepared in Gradle is duplicated with target in build.xml, an error will occur. Therefore, it seems good to be able to execute the target of ant with ant. [Target name] as shown below.


ant.importBuild('build.xml') {
    antTaskName -> "ant.${antTaskName}".toString()
$ gradle tasks --all
Other tasks

Property setting method

You could specify an argument with -D when running Ant, but you can do the same with Gradle.

▼ Define property on build.xml side


<?xml version="1.0" encoding="utf-8" ?>

<project name="antsample" default="target01">
    <property name="message" value="default message"/>
    <target name="target01">
        <echo message="${message}" />

▼ Gradle side only needs to import build.xml


ant.importBuild 'build.xml'

▼ I was able to specify a message and echo

$ gradle target01 -Dmessage='message param'
> Task :target01
[ant:echo] message param

1 actionable task: 1 executed


I just had to run Ant from Gradle with arguments, but I had a lot of trouble. At first, I used ant.properties on the gradle.build side to pass arguments, but I was able to execute target directly from the command line with "-D" without using it, so it was quite refreshing.

Gradle and Groovy are interesting to touch, so I'll post if I've learned anything again.


Gradle User Guide Gradle (build.gradle) Introduction to reading and writing

Thank you for your cooperation.

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