gradle - 扩展“战争”任务的自定义 gradle 任务看不到一些必需的类

Question

我一直在尝试迁移到 Gradle 一段时间。我必须做的一件事是根据通常添加的条目在 WAR 文件中自动创建其他条目。出于性能和其他原因，我尝试通过在 War 任务的自定义子类中自动执行此操作，以与之前相同的方式执行此操作。由于我必须解决私有可见性和最终字段，这并不像我想要的那么好，但它在开始之前就失败了。当我从 org.apache.tools.zip 包中添加对类的引用时，构建在运行时失败，并出现以下堆栈跟踪：

17:44:32.888 [ERROR] [org.gradle.BuildExceptionReporter] FAILURE: Build failed with an exception.
17:44:32.900 [ERROR] [org.gradle.BuildExceptionReporter]
17:44:32.907 [ERROR] [org.gradle.BuildExceptionReporter] * Where:
17:44:32.914 [ERROR] [org.gradle.BuildExceptionReporter] Build file '...\build.gradle' line: 92
17:44:32.921 [ERROR] [org.gradle.BuildExceptionReporter]
17:44:32.928 [ERROR] [org.gradle.BuildExceptionReporter] * What went wrong:
17:44:32.935 [ERROR] [org.gradle.BuildExceptionReporter] A problem occurred evaluating root project '...'.
17:44:32.942 [ERROR] [org.gradle.BuildExceptionReporter] > Could not generate a proxy class for class ....ProblemWarTask.
17:44:32.953 [ERROR] [org.gradle.BuildExceptionReporter]
17:44:32.960 [ERROR] [org.gradle.BuildExceptionReporter] * Exception is:
17:44:32.969 [ERROR] [org.gradle.BuildExceptionReporter] org.gradle.api.GradleScriptException: A problem occurred evaluating root project '...'.
17:44:32.976 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.groovy.scripts.internal.DefaultScriptRunnerFactory$ScriptRunnerImpl.run(DefaultScriptRunnerFactory.java:54)
17:44:32.983 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.configuration.DefaultScriptPluginFactory$ScriptPluginImpl.apply(DefaultScriptPluginFactory.java:127)
17:44:32.991 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.configuration.BuildScriptProcessor.evaluate(BuildScriptProcessor.java:38)
17:44:32.998 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.configuration.LifecycleProjectEvaluator.evaluate(LifecycleProjectEvaluator.java:44)
17:44:33.005 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.api.internal.project.AbstractProject.evaluate(AbstractProject.java:464)
17:44:33.013 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.api.internal.project.AbstractProject.evaluate(AbstractProject.java:77)
17:44:33.020 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.configuration.DefaultBuildConfigurer$ConfigureProject.execute(DefaultBuildConfigurer.java:38)
17:44:33.027 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.configuration.DefaultBuildConfigurer$ConfigureProject.execute(DefaultBuildConfigurer.java:36)
17:44:33.034 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.api.internal.project.AbstractProject.configure(AbstractProject.java:440)
17:44:33.041 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.api.internal.project.AbstractProject.allprojects(AbstractProject.java:435)
17:44:33.048 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.configuration.DefaultBuildConfigurer.configure(DefaultBuildConfigurer.java:32)
17:44:33.055 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:142)
17:44:33.062 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:113)
17:44:33.069 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:81)
17:44:33.077 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.launcher.cli.ExecuteBuildAction.run(ExecuteBuildAction.java:38)
17:44:33.086 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.launcher.exec.InProcessGradleLauncherActionExecuter.execute(InProcessGradleLauncherActionExecuter.java:39)
17:44:33.095 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.launcher.exec.InProcessGradleLauncherActionExecuter.execute(InProcessGradleLauncherActionExecuter.java:25)
17:44:33.103 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.launcher.cli.RunBuildAction.run(RunBuildAction.java:50)
17:44:33.112 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.api.internal.Actions$RunnableActionAdapter.execute(Actions.java:171)
17:44:33.121 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:201)
17:44:33.130 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:174)
17:44:33.139 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:170)
17:44:33.148 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:139)
17:44:33.157 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:33)
17:44:33.166 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:22)
17:44:33.175 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.launcher.Main.doAction(Main.java:48)
17:44:33.182 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.launcher.bootstrap.EntryPoint.run(EntryPoint.java:45)
17:44:33.190 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.launcher.Main.main(Main.java:39)
17:44:33.197 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.launcher.bootstrap.ProcessBootstrap.runNoExit(ProcessBootstrap.java:50)
17:44:33.206 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.launcher.bootstrap.ProcessBootstrap.run(ProcessBootstrap.java:32)
17:44:33.216 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.launcher.GradleMain.main(GradleMain.java:26)
17:44:33.227 [ERROR] [org.gradle.BuildExceptionReporter] Caused by: org.gradle.api.GradleException: Could not generate a proxy class for class ....ProblemWarTask.
17:44:33.238 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.api.internal.AbstractClassGenerator.generate(AbstractClassGenerator.java:201)
17:44:33.249 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.api.internal.project.taskfactory.TaskFactory.createTaskObject(TaskFactory.java:105)
17:44:33.258 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.api.internal.project.taskfactory.TaskFactory.createTask(TaskFactory.java:70)
17:44:33.266 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory.createTask(AnnotationProcessingTaskFactory.java:93)
17:44:33.276 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.api.internal.project.taskfactory.DependencyAutoWireTaskFactory.createTask(DependencyAutoWireTaskFactory.java:39)
17:44:33.285 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.api.internal.tasks.DefaultTaskContainer.add(DefaultTaskContainer.java:56)
17:44:33.294 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.api.internal.project.AbstractProject.task(AbstractProject.java:921)
17:44:33.301 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.api.internal.BeanDynamicObject$MetaClassAdapter.invokeMethod(BeanDynamicObject.java:216)
17:44:33.311 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.api.internal.BeanDynamicObject.invokeMethod(BeanDynamicObject.java:122)
17:44:33.319 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.api.internal.CompositeDynamicObject.invokeMethod(CompositeDynamicObject.java:147)
17:44:33.328 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.groovy.scripts.BasicScript.methodMissing(BasicScript.java:83)
17:44:33.335 [ERROR] [org.gradle.BuildExceptionReporter]        at build_77lv568h8hqtuhsa63froq7bcr.run(...\build.gradle:92)
17:44:33.343 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.groovy.scripts.internal.DefaultScriptRunnerFactory$ScriptRunnerImpl.run(DefaultScriptRunnerFactory.java:52)
17:44:33.352 [ERROR] [org.gradle.BuildExceptionReporter]        ... 30 more
17:44:33.362 [ERROR] [org.gradle.BuildExceptionReporter] Caused by: java.lang.NoClassDefFoundError: Lorg/apache/tools/zip/ZipOutputStream;
17:44:33.370 [ERROR] [org.gradle.BuildExceptionReporter]        at org.gradle.api.internal.AbstractClassGenerator.generate(AbstractClassGenerator.java:100)
17:44:33.379 [ERROR] [org.gradle.BuildExceptionReporter]        ... 42 more
17:44:33.387 [ERROR] [org.gradle.BuildExceptionReporter] Caused by: java.lang.ClassNotFoundException: org.apache.tools.zip.ZipOutputStream
17:44:33.395 [ERROR] [org.gradle.BuildExceptionReporter]        ... 43 more
17:44:33.403 [ERROR] [org.gradle.BuildExceptionReporter]
17:44:33.411 [LIFECYCLE] [org.gradle.BuildResultLogger]
17:44:33.419 [LIFECYCLE] [org.gradle.BuildResultLogger] BUILD FAILED

这仍然主要是学习 Gradle。我现在最大的问题实际上是不理解为什么会发生这种情况以及我一般缺少什么（即如果/当我编写其他任务时）。为什么这会很好地通过编译阶段（buildSrc.jar 创建得很好）但在运行时失败？

这是稍微混淆的源代码（您会看到它主要是 Gradle 自己的代码的副本 - 即 Zip 任务）：

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.lang.reflect.Constructor;

import org.apache.tools.zip.UnixStat;
import org.apache.tools.zip.ZipEntry;
import org.apache.tools.zip.ZipOutputStream;

import org.gradle.api.file.FileVisitDetails;
import org.gradle.api.GradleException;
import org.gradle.api.internal.file.archive.ZipCopyAction;
import org.gradle.api.internal.file.archive.ZipCopySpecVisitor;
import org.gradle.api.internal.file.copy.CopyAction;
import org.gradle.api.internal.file.copy.CopyActionImpl;
import org.gradle.api.internal.file.copy.CopySpecImpl;
import org.gradle.api.internal.file.copy.CopySpecVisitor;
import org.gradle.api.internal.file.copy.MappingCopySpecVisitor;
import org.gradle.api.internal.file.copy.NormalizingCopySpecVisitor;
import org.gradle.api.internal.file.copy.ReadableCopySpec;
import org.gradle.api.internal.file.copy.ZipCompressor;
import org.gradle.api.internal.file.copy.ZipDeflatedCompressor;
import org.gradle.api.internal.file.FileResolver;
import org.gradle.api.tasks.bundling.War;
import org.gradle.api.tasks.bundling.Zip;
import org.gradle.api.UncheckedIOException;
import org.gradle.internal.nativeplatform.filesystem.FileSystems;

class ProblemWarTask extends War {

  private ZipCopyActionImpl copyAction = null;

  public ProblemWarTask() {}

  protected synchronized Zip.ZipCopyActionImpl getCopyAction() {
    if (copyAction == null) {
      copyAction = new ProblemWarCopyActionImpl(getServices().get(FileResolver.class));
    }
    return copyAction;
  }

  protected class ProblemWarCopyActionImpl extends Zip.ZipCopyActionImpl {
    private final CopySpecVisitor visitor;

    public ProblemWarCopyActionImpl(FileResolver fileResolver) {
      super((FileResolver) fileResolver);
      visitor = new MappingCopySpecVisitor(new NormalizingCopySpecVisitor(new ProblemWarCopySpecVisitor()), FileSystems.getDefault());
    }

    public void execute() {
      visitor.startVisit(this);
      for (ReadableCopySpec spec : getRootSpec().getAllSpecs()) {
        visitor.visitSpec(spec);
        spec.getSource().visit(visitor);
      }
     visitor.endVisit();
    }

    public boolean getDidWork() {
        return visitor.getDidWork();
    }
  }

  protected class ProblemWarCopySpecVisitor extends ZipCopySpecVisitor {
    private ZipOutputStream zipOutStr;
    private File zipFile;

    public void startVisit(CopyAction action) {
      ZipCopyAction archiveAction = (ZipCopyAction) action;
      zipFile = archiveAction.getArchivePath();
      try {
        zipOutStr = archiveAction.getCompressor().createArchiveOutputStream(zipFile);
      } catch (Exception e) {
        throw new GradleException(String.format("Could not create ZIP '%s'.", zipFile), e);
      }
    }

    public void endVisit() {
      try {
        zipOutStr.close();
      } catch (IOException e) {
        throw new UncheckedIOException(e);
      } finally {
        zipOutStr = null;
      }
    }

    public void visitFile(FileVisitDetails fileDetails) {
      try {
        ZipEntry archiveEntry = new ZipEntry(fileDetails.getRelativePath().getPathString());
        archiveEntry.setTime(fileDetails.getLastModified());
        archiveEntry.setUnixMode(UnixStat.FILE_FLAG | fileDetails.getMode());
        zipOutStr.putNextEntry(archiveEntry);
        fileDetails.copyTo(zipOutStr);
        zipOutStr.closeEntry();
      } catch (Exception e) {
        throw new GradleException(String.format("Could not add %s to ZIP '%s'.", fileDetails, zipFile), e);
      }

      // Now do a little more - add stuff

      try {
        if (...) { 
          byte[] buffer;
          ...
          ZipEntry archiveEntry = new ZipEntry(secondPath);
          archiveEntry.setTime(fileDetails.getLastModified());
          archiveEntry.setUnixMode(UnixStat.FILE_FLAG | fileDetails.getMode());
          zipOutStr.putNextEntry(archiveEntry);
          zipOutStr.write(buffer, 0, buffer.length);
          zipOutStr.closeEntry();
        }
      } catch (Exception e) {
        throw new GradleException(String.format("Could not add secondary form of %s to ZIP '%s'.", fileDetails, zipFile), e);
      }
    }

    public void visitDir(FileVisitDetails dirDetails) {
      try {
        // Trailing slash in name indicates that entry is a directory
        ZipEntry archiveEntry = new ZipEntry(dirDetails.getRelativePath().getPathString() + '/');
        archiveEntry.setTime(dirDetails.getLastModified());
        archiveEntry.setUnixMode(UnixStat.DIR_FLAG | dirDetails.getMode());
        zipOutStr.putNextEntry(archiveEntry);
        zipOutStr.closeEntry();
      } catch (Exception e) {
        throw new GradleException(String.format("Could not add %s to ZIP '%s'.", dirDetails, zipFile), e);
      }
    }
  }
}

目前构建脚本本身并没有做任何特别的事情：

task war(type: ....ProblemWarTask) {
  ...
}

主体与我用于“战争”任务的主体相同，甚至与此任务（ProblemWarTask）的初始实验相同。当我添加对注意到的包的引用时，异常开始发生。困扰我的是，当“战争”任务最终具有与该任务相同的一组运行时依赖项时，它如何能够正常运行。

这是 Gradle 1.5。我还尝试将以下内容添加到 build.gradle 但没有帮助（同样的错误）：

buildscript {
  dependencies {
    classpath files(".../gradle/lib/ant-1.8.4.jar")
  }
}

编辑- 尝试使用 Gradle 1.6，没有变化。也发布在 Gradle 论坛中：

http://forums.gradle.org/gradle/topics/custom_gradle_task_extending_the_war_task_does_not_see_some_required_classes?rfm=1

编辑 2 - 可以在以下位置找到独立的示例文件：

http://wikisend.com/download/241430/sample.zip

score 3 · Accepted Answer

诸如此类的任务类型War并非旨在由用户进行子类化。与其子类化和使用大量内部构件，不如编写一个插件（在最简单的情况下只是另一个应用的构建脚本apply from: "path/to/script.gradle"），使用其公共 API 预配置任务，通常会更好（也更容易）。例如：

tasks.withType(War) {
    eachFile { FileCopyDetails details -> ... }
}

如果绝对必要，这种配置也可以进入子类的构造函数。

也就是说，我不确定您为什么会遇到 Ant 类的类加载器问题。如果您可以在http://forums.gradle.org上提交带有自包含可重现示例的问题，我们会看看。

gradle - 扩展“战争”任务的自定义 gradle 任务看不到一些必需的类

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