Ant target fails then imported into gradle

[kec2 (Klaus Christiansen)]

I have a problem with an Ant target imported into a gradle build file.

There is no problem running the Ant target ‘generate-xsd’ from Ant. But I get an exception if I do it from gradle.

Im using gradle 2.14

Ant build file: build.xml

<?xml version="1.0" encoding="UTF-8" ?>
<project name="CAGenTUI2Forms" default="generate-xsd" basedir=".">
    <description>
        Generate Java source files from *.xsd in dk.xact.tui.
    </description>

    <property name="src" location="src" />
    <property name="xsd-dir" location="${src}/dk/xact/xsd" />
    <property name="java-dir" location="${src}/dk/xact/tui" />
    <property name="package" value="dk.xact.tui" />

    <taskdef name="xjc" classname="com.sun.tools.xjc.XJCTask">
        <classpath>
            <pathelement location="lib/jaxb-xjc.jar" />
        </classpath>
    </taskdef>

    <!-- Generate Java source files. -->
    <target name="generate-xsd-to-java" description="Generate XSD to Java source files">
        <echo message="Generate XSD to Java source files" />

        <xjc destdir="${src}" package="${package}">
            <produces dir="${java-dir}" />
            <schema dir="${xsd-dir}" includes="*.xsd" />
        </xjc>
    </target>

    <!-- Remove time from timestamps. -->
    <target name="generate-xsd" depends="generate-xsd-to-java">
        <echo message="Remove time from timestamps" />

        <replaceregexp byline="true">
            <regexp pattern="^(\/\/ Generated on\: \d+\.\d+\.\d+) at .+$"/>
            <substitution expression="\1"/>
            <fileset dir="${java-dir}">
                <include name="*.java"/>
            </fileset>
        </replaceregexp>
    </target>
</project>

gralde build file: build.gradle

apply plugin: 'java'

sourceCompatibility = 1.7
targetCompatibility = 1.7

repositories {
    mavenCentral()
}

dependencies {
    compile group: 'javax.xml.bind', name: 'jaxb-api', version: '2.2.12'
}

sourceSets {
    main {
        java.srcDirs = ['src']
    }
}

ant.importBuild 'build.xml'

classes {
    dependsOn 'generate-xsd'
}

Stacktrace:

:compileJava
:generate-xsd-to-java
[ant:echo] Generate XSD to Java source files
:generate-xsd
[ant:echo] Remove time from timestamps
:generate-xsd FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':generate-xsd'.
> org/apache/tools/ant/launch/Launcher

* Try:
Run with --info or --debug option to get more log output.

* Exception is:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':generate-xsd'.
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:69)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:46)
        at org.gradle.api.internal.tasks.execution.PostExecutionAnalysisTaskExecuter.execute(PostExecutionAnalysisTaskExecuter.java:35)
        at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:66)
        at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:58)
        at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:52)
        at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:52)
        at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:53)
        at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43)
        at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:203)
        at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:185)
        at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.processTask(AbstractTaskPlanExecutor.java:66)
        at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.run(AbstractTaskPlanExecutor.java:50)
        at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor.process(DefaultTaskPlanExecutor.java:25)
        at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:110)
        at org.gradle.execution.SelectedTaskExecutionAction.execute(SelectedTaskExecutionAction.java:37)
        at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:37)
        at org.gradle.execution.DefaultBuildExecuter.access$000(DefaultBuildExecuter.java:23)
        at org.gradle.execution.DefaultBuildExecuter$1.proceed(DefaultBuildExecuter.java:43)
        at org.gradle.execution.DryRunBuildExecutionAction.execute(DryRunBuildExecutionAction.java:32)
        at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:37)
        at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:30)
        at org.gradle.initialization.DefaultGradleLauncher$4.run(DefaultGradleLauncher.java:153)
        at org.gradle.internal.Factories$1.create(Factories.java:22)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:91)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:53)
        at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:150)
        at org.gradle.initialization.DefaultGradleLauncher.access$200(DefaultGradleLauncher.java:32)
        at org.gradle.initialization.DefaultGradleLauncher$1.create(DefaultGradleLauncher.java:98)
        at org.gradle.initialization.DefaultGradleLauncher$1.create(DefaultGradleLauncher.java:92)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:91)
        at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:63)
        at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:92)
        at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:83)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter$DefaultBuildController.run(InProcessBuildActionExecuter.java:99)
        at org.gradle.tooling.internal.provider.ExecuteBuildActionRunner.run(ExecuteBuildActionRunner.java:28)
        at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:48)
        at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:30)
        at org.gradle.launcher.exec.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:81)
        at org.gradle.launcher.exec.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:46)
        at org.gradle.launcher.exec.DaemonUsageSuggestingBuildActionExecuter.execute(DaemonUsageSuggestingBuildActionExecuter.java:51)
        at org.gradle.launcher.exec.DaemonUsageSuggestingBuildActionExecuter.execute(DaemonUsageSuggestingBuildActionExecuter.java:28)
        at org.gradle.launcher.cli.RunBuildAction.run(RunBuildAction.java:43)
        at org.gradle.internal.Actions$RunnableActionAdapter.execute(Actions.java:173)
        at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:239)
        at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:212)
        at org.gradle.launcher.cli.JavaRuntimeValidationAction.execute(JavaRuntimeValidationAction.java:35)
        at org.gradle.launcher.cli.JavaRuntimeValidationAction.execute(JavaRuntimeValidationAction.java:24)
        at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:33)
        at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:22)
        at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:205)
        at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:169)
        at org.gradle.launcher.Main.doAction(Main.java:33)
        at org.gradle.launcher.bootstrap.EntryPoint.run(EntryPoint.java:45)
        at org.gradle.launcher.bootstrap.ProcessBootstrap.runNoExit(ProcessBootstrap.java:55)
        at org.gradle.launcher.bootstrap.ProcessBootstrap.run(ProcessBootstrap.java:36)
        at org.gradle.launcher.GradleMain.main(GradleMain.java:23)
        at org.gradle.wrapper.BootstrapMainStarter.start(BootstrapMainStarter.java:30)
        at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:129)
        at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:61)
Caused by: java.lang.NoClassDefFoundError: org/apache/tools/ant/launch/Launcher
        at org.apache.tools.ant.ComponentHelper.diagnoseCreationFailure(ComponentHelper.java:893)
        at org.apache.tools.ant.UnknownElement.getNotFoundException(UnknownElement.java:499)
        at org.apache.tools.ant.UnknownElement.makeObject(UnknownElement.java:432)
        at org.apache.tools.ant.UnknownElement.maybeConfigure(UnknownElement.java:164)
        at org.apache.tools.ant.Task.perform(Task.java:347)
        at org.apache.tools.ant.Target.execute(Target.java:435)
        at org.apache.tools.ant.Target.performTasks(Target.java:456)
        at org.gradle.api.tasks.ant.AntTarget.executeAntTarget(AntTarget.java:37)
        at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:75)
        at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.doExecute(AnnotationProcessingTaskFactory.java:228)
        at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:221)
        at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:210)
        at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:621)
        at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:604)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:80)
        at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:61)
        ... 60 more
Caused by: java.lang.ClassNotFoundException: org.apache.tools.ant.launch.Launcher
        ... 76 more

BUILD FAILED

Total time: 5.16 secs

[aspevec (Andelko)]

Hey,

I posted here the same problem with example, explanation and current fix.

Issue when executing XJC Ant task through Gradle - ClassNotFoundException

Hello all, we had an ClassNotFoundException happening after executing XJC Ant task through Gradle. And we managed to find the root cause for this and it’s in the JAXB implementation. That implementation closes ClassLoader (ant-loader) from Gradle and prevents from loading new classes. Issue for that is opened: https://github.com/eclipse-ee4j/jaxb-ri/issues/1391 I’m writing this here just in case somebody from the community has the same issue and to save them the trouble of debugging ClassLoad…

It’s the issue with JAXB/XJB library and issue is reported: XJC task is closing wrong ClassLoader - ClassNotFoundException · Issue #51 · eclipse-ee4j/jaxb-istack-commons · GitHub

If you execute:

./gradlew generate_xsd --full-stacktrace --debug

You will get something like:

[DEBUG] [org.gradle.api.internal.project.ant.AntLoggingAdapter] Could not load class (org.apache.tools.ant.taskdefs.Replace) for type replace

We solved it with downgrading JAXB/XJC libraries until this is fixed. You can check GitHub - aspevec/xjc_ant_gradle: Repository for simulating bug in XJC implementation for example and more explanations.

[kec2 (Klaus Christiansen)]

Thanks.

I had forgotten all about this.

My solution was to have Eclipse run the ANT task via a builder in order to generate Java files.