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  1. Gradle
  2. GRADLE-771

Handle name clashes between Gradle tasks and imported Ant targets

    Details

    • Type: Improvement
    • Status: Resolved
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 2.2-rc-1

      Description

      a typical migration scenario of your Ant Java project starts with build.gradle looking like this:
      ant.importBuild 'build.xml'
      usePlugin 'java'

      it will probably fail because of name clash of tasks from build.xml and those provided by Java plugin:
      FAILURE: Build failed with an exception.

      • Where:
        Build file '/home/tomek/temp/reportng/reportng/build.gradle' line: 3
      • What went wrong:
        A problem occurred evaluating root project 'reportng'.
        Cause: Cannot add task ':clean' as a task with that name already exists.

      Possible solutions (ideas from mailing list discussion):
      a) implement an "ovewriteTaskByDefault" feature in Gradle
      b) I think the solution lives on AntBuilder or some other Ant-specific thing. Some options:

      • ant.import() allows you to specify a namespace for the imported tasks, eg prefix each task with 'ant.'
      • ant.import() allows you to specify which tasks to include or exclude when importing.

        Activity

        Hide
        taytay Taylor Brown added a comment -

        Being able to put a namespace on my imported tasks would be helpful. I am in the process of migrating from ant, and this feature would have helped me. I use the GradleFx plugin which defines a "test" task. So does my ant build. I will be editing my build.xml of course, but it would have been nice to say, "Put all of these tasks into my custom namespace".

        Show
        taytay Taylor Brown added a comment - Being able to put a namespace on my imported tasks would be helpful. I am in the process of migrating from ant, and this feature would have helped me. I use the GradleFx plugin which defines a "test" task. So does my ant build. I will be editing my build.xml of course, but it would have been nice to say, "Put all of these tasks into my custom namespace".
        Hide
        rmathur Rohitashva Mathur added a comment -

        You can create your own namespace for these ant tasks by leveraging an intermediate ant build file that references the original ant build file and attaches a namespace to the tasks defined therein.

        So, if the original build file is build.xml, create another ant build file called wrapper.xml and define it like the following fragment -

        <project default="test">

        <include file="build.xml" as="somename"/>

        </project>

        in the gradle build script instead of referring build.xml, refer wrapper.xml

        //ant.importBuild 'build.xml'
        ant.importBuild 'wrapper.xml'

        All the ant tasks are now available under namespace "somename". A task named 'clean' in build.xml can now be invoked via gradle with names as somename.clean, and build.gradle can have its own version of clean.

        gradle clean – clean in build.gradle
        gradle somename.clean – clean from the build.xml

        Show
        rmathur Rohitashva Mathur added a comment - You can create your own namespace for these ant tasks by leveraging an intermediate ant build file that references the original ant build file and attaches a namespace to the tasks defined therein. So, if the original build file is build.xml, create another ant build file called wrapper.xml and define it like the following fragment - <project default="test"> <include file="build.xml" as="somename"/> </project> in the gradle build script instead of referring build.xml, refer wrapper.xml //ant.importBuild 'build.xml' ant.importBuild 'wrapper.xml' All the ant tasks are now available under namespace "somename". A task named 'clean' in build.xml can now be invoked via gradle with names as somename.clean, and build.gradle can have its own version of clean. gradle clean – clean in build.gradle gradle somename.clean – clean from the build.xml
        Hide
        schipy Peter Sipos added a comment -

        This would also be very useful when using multiple plugins. Actually even for simple use-cases like a flex build which publishes to a maven repo, you need maven plugin, which requires Java plugin and gradleFx both defining the basic tasks, like clean, test. I also encountered the migration issue when imported legacy build.xml - it will surely have 'clean' and similar basic tasks names. This feature is a MUST.

        Show
        schipy Peter Sipos added a comment - This would also be very useful when using multiple plugins. Actually even for simple use-cases like a flex build which publishes to a maven repo, you need maven plugin, which requires Java plugin and gradleFx both defining the basic tasks, like clean, test. I also encountered the migration issue when imported legacy build.xml - it will surely have 'clean' and similar basic tasks names. This feature is a MUST.
        Hide
        erik.vonderheid@gmail.com Erik Vonderheid added a comment - - edited

        Here is another solution without a wrapper XML:

        Thanks for the solution Peter.

        C:\Users\mahmood\dev\gradle\ant-with-local-buildXml>tree /F /A | findstr "build settings ant"
        | build.gradle
        | build.xml
        | settings.gradle
        ---ant

        C:\Users\mahmood\dev\gradle\ant-with-local-buildXml>type build.gradle

        project(':ant') {
        ant.importBuild '../build.xml'
        }

        task hellogradle << {
        println 'hello from gradle'
        }

        task helloant << {
        println 'hello from gradle to ant'
        }
        C:\Users\mahmood\dev\gradle\ant-with-local-buildXml>type settings.gradle
        include 'ant'
        C:\Users\mahmood\dev\gradle\ant-with-local-buildXml>gradle tasks
        :tasks

        Other tasks
        -----------
        helloant
        hellogradle

        Total time: 3.603 secs
        C:\Users\mahmood\dev\gradle\ant-with-local-buildXml>gradle helloant
        :helloant
        hello from gradle to ant
        :ant:helloant
        [ant:echo] hello from ant

        BUILD SUCCESSFUL

        Total time: 3.248 secs
        C:\Users\mahmood\dev\gradle\ant-with-local-buildXml>gradle :ant:helloant
        :ant:helloant
        [ant:echo] hello from ant

        BUILD SUCCESSFUL

        Show
        erik.vonderheid@gmail.com Erik Vonderheid added a comment - - edited Here is another solution without a wrapper XML: Thanks for the solution Peter. C:\Users\mahmood\dev\gradle\ant-with-local-buildXml>tree /F /A | findstr "build settings ant" | build.gradle | build.xml | settings.gradle ---ant C:\Users\mahmood\dev\gradle\ant-with-local-buildXml>type build.gradle project(':ant') { ant.importBuild '../build.xml' } task hellogradle << { println 'hello from gradle' } task helloant << { println 'hello from gradle to ant' } C:\Users\mahmood\dev\gradle\ant-with-local-buildXml>type settings.gradle include 'ant' C:\Users\mahmood\dev\gradle\ant-with-local-buildXml>gradle tasks :tasks Other tasks ----------- helloant hellogradle Total time: 3.603 secs C:\Users\mahmood\dev\gradle\ant-with-local-buildXml>gradle helloant :helloant hello from gradle to ant :ant:helloant [ant:echo] hello from ant BUILD SUCCESSFUL Total time: 3.248 secs C:\Users\mahmood\dev\gradle\ant-with-local-buildXml>gradle :ant:helloant :ant:helloant [ant:echo] hello from ant BUILD SUCCESSFUL
        Hide
        typek_pb Peter Butkovic added a comment -

        not sure why, but workaround proposed by @RohitashvaMathur didn't work for me.

        Show
        typek_pb Peter Butkovic added a comment - not sure why, but workaround proposed by @RohitashvaMathur didn't work for me.

          People

          • Assignee:
            ldaley Luke Daley
            Reporter:
            tomekk Tomek Kaczanowski
          • Votes:
            11 Vote for this issue
            Watchers:
            14 Start watching this issue

            Dates

            • Created:
              Updated:
              Resolved:

              Development