在gradle 与jacoco集成以后build时会报以上错误，原因是SourceSetOutput.getClassesDir() 是 Gradle 4中的方法，在Gradle 5中被标记过时，替代方法是 getClassesDirs() ，此时返回值是FileCollection。要想获得File,需调用getSingleFile()。
解决方式如下：
将 output.classesDir 替换成 output.classesDirs.singleFile
修改后的集成脚本如下：
//Additional SourceSets can be added to the jacocoOfflineSourceSets as needed by
project.ext.jacocoOfflineSourceSets = [ 'main' ]
task doJacocoOfflineInstrumentation(dependsOn: [ classes, project.configurations.jacocoAnt ]) {
inputs.files classes.outputs.files
File outputDir = new File(project.buildDir, 'instrumentedClasses')
outputs.dir outputDir
doFirst {
project.delete(outputDir)
ant.taskdef(
resource: 'org/jacoco/ant/antlib.xml',
classpath: project.configurations.jacocoAnt.asPath,
uri: 'jacoco'
)
def instrumented = false
jacocoOfflineSourceSets.each { sourceSetName ->
if (file(sourceSets[sourceSetName].output.classesDirs.singleFile).exists()) {
def instrumentedClassedDir = "${outputDir}/${sourceSetName}"
ant.'jacoco:instrument'(destdir: instrumentedClassedDir) {
fileset(dir: sourceSets[sourceSetName].output.classesDirs.singleFile, includes: '**/*.class')
}
//Replace the classes dir in the test classpath with the instrumented one
sourceSets.test.runtimeClasspath -= files(sourceSets[sourceSetName].output.classesDirs.singleFile)
sourceSets.test.runtimeClasspath += files(instrumentedClassedDir)
instrumented = true
}
}
if (instrumented) {
//Disable class verification based on https://github.com/jayway/powermock/issues/375
test.jvmArgs += '-noverify'
}
}
}
test.dependsOn doJacocoOfflineInstrumentation
jacocoTestReport {
reports {
xml.enabled true
csv.enabled true
html.enabled true
}
}
check.dependsOn jacocoTestReport
Gradle 5.6 源码链接： https://docs.gradle.org/current/javadoc/org/gradle/api/tasks/SourceSetOutput.html?_ga=2.59713389.1546270617.1566195252-732042021.1552302913#getClassesDirs--