Gradle Copy任务说没有来源

Question

我有这个Gradle脚本作为deploy.gradle（Gradle 4.3.1）：

defaultTasks 'echoProp'
import org.apache.tools.ant.filters.ReplaceTokens

task copyWar(type: Copy) {
    from "${source}"
    into "${target}"
    include '*.war'
}

task echoProp(dependsOn: copyWar) << {
    println "source dir: ${source}"
    println "target dir: ${target}"
    println "source = ${project.property('source')}"
    def currentJvm = org.gradle.internal.jvm.Jvm.current()
    println currentJvm
}

这是粗略的输出：

                                        The Task.leftShift(Closure) method has been deprecated and is scheduled to be removed in Gradle 5.0. Please use Task.doLast(Action) instead.
    at deploy_13e4yjnom30svmprt2wccq4te.run(E:\environments\GRADLE_TEST\TEST\TESTDEPLOY\source\71\deploy.gradle:10)
    (Run with --stacktrace to get the full stack trace of this deprecation warning.)
:copyWar NO-SOURCE
:echoProp
source dir: E:/environments/GRADLE_TEST/TEST/TESTDEPLOY/source/71
target dir: E:/environments/GRADLE_TEST/TEST/TESTDEPLOY/target
source = E:/environments/GRADLE_TEST/TEST/TESTDEPLOY/source/71
1.8.0_31 (Oracle Corporation 25.31-b07)

BUILD SUCCESSFUL in 1s
1 actionable task: 1 executed

它在Windows Server 2012 R2计算机上运行。我检查了一下，在定义的源目录中是否存在.war文件。

我不知道为什么它不能复制到testApp.war文件上。我的意思是，其他任务也很好地定义了源目录，但是为什么copyWar任务找不到这些文件？

---

删除<<并使用--info标志运行的结果：

Initialized native services in: C:\Windows\System32\config\systemprofile\.gradle\native
The client will now receive all logging from the daemon (pid: 5580). The daemon log file: C:\Windows\System32\config\systemprofile\.gradle\daemon\4.3.1\daemon-5580.out.log
Starting 19th build in daemon [uptime: 1 hrs 14 mins 1.715 secs, performance: 98%, no major garbage collections]
Using 2 worker leases.
Creating new cache for fileHashes, path E:\environments\GRADLE_TEST\TEST\TESTDEPLOY\source\72\.gradle\4.3.1\fileHashes\fileHashes.bin, access org.gradle.cache.internal.DefaultCacheAccess@6e59e113
Creating new cache for plugin-use-metadata, path C:\Windows\System32\config\systemprofile\.gradle\caches\4.3.1\plugin-resolution\plugin-use-metadata.bin, access org.gradle.cache.internal.DefaultCacheAccess@4092835c
Creating new cache for client-status, path C:\Windows\System32\config\systemprofile\.gradle\caches\4.3.1\plugin-resolution\client-status.bin, access org.gradle.cache.internal.DefaultCacheAccess@4092835c
Starting Build
Settings evaluated using settings file.
Projects loaded. Root project using build file 'E:\environments\GRADLE_TEST\TEST\TESTDEPLOY\source\72\deploy.gradle'.
Included projects: [root project '72']
Evaluating root project '72' using build file 'E:\environments\GRADLE_TEST\TEST\TESTDEPLOY\source\72\deploy.gradle'.
Compiling build file 'E:\environments\GRADLE_TEST\TEST\TESTDEPLOY\source\72\deploy.gradle' using SubsetScriptTransformer.
Compiling build file 'E:\environments\GRADLE_TEST\TEST\TESTDEPLOY\source\72\deploy.gradle' using BuildScriptTransformer.
source dir: file tree
target dir: E:/environments/GRADLE_TEST/TEST/TESTDEPLOY/target
source dir: E:/environments/GRADLE_TEST/TEST/TESTDEPLOY/source/72
target dir: E:/environments/GRADLE_TEST/TEST/TESTDEPLOY/target
source = E:/environments/GRADLE_TEST/TEST/TESTDEPLOY/source/72
1.8.0_31 (Oracle Corporation 25.31-b07)
All projects evaluated.
No tasks specified. Using project default tasks 'echoProp'
Selected primary task 'echoProp' from project :
Tasks to be executed: [task ':copyWar', task ':echoProp']
Creating new cache for resourceHashesCache, path E:\environments\GRADLE_TEST\TEST\TESTDEPLOY\source\72\.gradle\4.3.1\fileHashes\resourceHashesCache.bin, access org.gradle.cache.internal.DefaultCacheAccess@6e59e113
Creating new cache for taskHistory, path E:\environments\GRADLE_TEST\TEST\TESTDEPLOY\source\72\.gradle\4.3.1\taskHistory\taskHistory.bin, access org.gradle.cache.internal.DefaultCacheAccess@1e64a7a6
Creating new cache for outputFiles, path E:\environments\GRADLE_TEST\TEST\TESTDEPLOY\source\72\.gradle\buildOutputCleanup\outputFiles.bin, access org.gradle.cache.internal.DefaultCacheAccess@4faa606d
:copyWar (Thread[Daemon worker Thread 15,5,main]) started.
:copyWar
Putting task artifact state for task ':copyWar' into context took 0.0 secs.
Skipping task ':copyWar' as it has no source files and no previous output files.
:copyWar NO-SOURCE
:copyWar (Thread[Daemon worker Thread 15,5,main]) completed. Took 0.002 secs.
:echoProp (Thread[Daemon worker Thread 15,5,main]) started.
:echoProp
Skipping task ':echoProp' as it has no actions.
:echoProp UP-TO-DATE
:echoProp (Thread[Daemon worker Thread 15,5,main]) completed. Took 0.004 secs.

另外，我的Gradle.properties的源变量和目标变量：

source=E\:/environments/GRADLE_TEST/TEST/TESTDEPLOY/source/72
target=E\:/environments/GRADLE_TEST/TEST/TESTDEPLOY/target

我是Gradle的新手，所以我不确定这意味着什么。

Answer 1

您的错误是该Copy任务具有名为的属性source。
您toString()将此方法的表示形式（是file tree）赋予了from方法。
当然，找不到WAR文件，因此复制任务无关。
将您的source属性重命名为其他名称，或者用于project.source显式引用source项目的属性，而不是任务中的属性。

除此之外，into "${target}"相同into target但性能更高。source并且target已经是字符串，但是您将它们用作占位符，这意味着需要首先评估占位符，这没有太大意义。