在https://github.com/gradle/gradle/issues/15038中似乎提到了这个问题，但是从该线程中不清楚如何解决它，所以在这里发布。我正在运行 Java 15：
> java --version
openjdk 15.0.2 2021-01-19
和 Gradle 6.6.1：
> gradle --version
------------------------------------------------------------
Gradle 6.6.1
------------------------------------------------------------
Build time: 2020-08-25 16:29:12 UTC
Revision: f2d1fb54a951d8b11d25748e4711bec8d128d7e3
Kotlin: 1.3.72
Groovy: 2.5.12
Ant: Apache Ant(TM) version 1.10.8 compiled on May 10 2020
JVM: 14.0.1 (Oracle Corporation 14.0.1+14)
OS: Mac OS X 10.16 x86_64
我已经开始了一个测试项目，选择Application它的类型，并添加了jacoco插件：
plugins {
// Apply the java plugin to add support for Java
id 'java'
// Apply the application plugin to add support for building a CLI application.
id 'application'
id 'jacoco'
}
但是，如果我尝试./gradlew test我得到以下错误：
> ./gradlew test
> Task :test
java.lang.instrument.IllegalClassFormatException: Error while instrumenting sun/util/resources/cldr/provider/CLDRLocaleDataMetaInfo.
at org.jacoco.agent.rt.internal_43f5073.CoverageTransformer.transform(CoverageTransformer.java:94)
at java.instrument/java.lang.instrument.ClassFileTransformer.transform(ClassFileTransformer.java:246)
at java.instrument/sun.instrument.TransformerManager.transform(TransformerManager.java:188)
at java.instrument/sun.instrument.InstrumentationImpl.transform(InstrumentationImpl.java:563)
at java.base/java.lang.ClassLoader.defineClass2(Native Method)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1108)
at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:183)
at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:784)
at java.base/jdk.internal.loader.BuiltinClassLoader.findClassInModuleOrNull(BuiltinClassLoader.java:705)
at java.base/jdk.internal.loader.BuiltinClassLoader.findClass(BuiltinClassLoader.java:586)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:634)
at java.base/java.lang.Class.forName(Class.java:546)
at java.base/java.util.ServiceLoader.loadProvider(ServiceLoader.java:854)
at java.base/java.util.ServiceLoader$ModuleServicesLookupIterator.hasNext(ServiceLoader.java:1078)
at java.base/java.util.ServiceLoader$2.hasNext(ServiceLoader.java:1301)
at java.base/java.util.ServiceLoader$3.hasNext(ServiceLoader.java:1386)
at java.base/sun.util.cldr.CLDRLocaleProviderAdapter$1.run(CLDRLocaleProviderAdapter.java:89)
at java.base/sun.util.cldr.CLDRLocaleProviderAdapter$1.run(CLDRLocaleProviderAdapter.java:86)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:554)
at java.base/sun.util.cldr.CLDRLocaleProviderAdapter.<init>(CLDRLocaleProviderAdapter.java:86)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:64)
at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500)
at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481)
at java.base/sun.util.locale.provider.LocaleProviderAdapter.forType(LocaleProviderAdapter.java:188)
at java.base/sun.util.locale.provider.LocaleProviderAdapter.findAdapter(LocaleProviderAdapter.java:287)
at java.base/sun.util.locale.provider.LocaleProviderAdapter.getAdapter(LocaleProviderAdapter.java:258)
at java.base/java.util.Calendar.createCalendar(Calendar.java:1693)
at java.base/java.util.Calendar.getInstance(Calendar.java:1661)
at java.base/java.text.SimpleDateFormat.initializeCalendar(SimpleDateFormat.java:677)
at java.base/java.text.SimpleDateFormat.<init>(SimpleDateFormat.java:621)
at java.base/java.text.SimpleDateFormat.<init>(SimpleDateFormat.java:600)
at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.getLastResortErrorLogFile(SystemApplicationClassLoaderWorker.java:162)
at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:111)
at org.gradle.process.internal.worker.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:71)
at worker.org.gradle.process.internal.worker.GradleWorkerMain.run(GradleWorkerMain.java:69)
at worker.org.gradle.process.internal.worker.GradleWorkerMain.main(GradleWorkerMain.java:74)
Caused by: java.io.IOException: Error while instrumenting sun/util/resources/cldr/provider/CLDRLocaleDataMetaInfo.
at org.jacoco.agent.rt.internal_43f5073.core.instr.Instrumenter.instrumentError(Instrumenter.java:159)
at org.jacoco.agent.rt.internal_43f5073.core.instr.Instrumenter.instrument(Instrumenter.java:109)
at org.jacoco.agent.rt.internal_43f5073.CoverageTransformer.transform(CoverageTransformer.java:92)
... 37 more
Caused by: java.lang.IllegalArgumentException: Unsupported class file major version 59
at org.jacoco.agent.rt.internal_43f5073.asm.ClassReader.<init>(ClassReader.java:195)
at org.jacoco.agent.rt.internal_43f5073.asm.ClassReader.<init>(ClassReader.java:176)
at org.jacoco.agent.rt.internal_43f5073.asm.ClassReader.<init>(ClassReader.java:162)
at org.jacoco.agent.rt.internal_43f5073.core.internal.instr.InstrSupport.classReaderFor(InstrSupport.java:280)
at org.jacoco.agent.rt.internal_43f5073.core.instr.Instrumenter.instrument(Instrumenter.java:75)
at org.jacoco.agent.rt.internal_43f5073.core.instr.Instrumenter.instrument(Instrumenter.java:107)
... 38 more
BUILD SUCCESSFUL in 1s
3 actionable tasks: 3 executed
前面提到的 GitHub 问题页面似乎说可以通过指定项目扩展名（https://docs.gradle.org/6.7/userguide/jacoco_plugin.html#sec:configuring_the_jacoco_plugintoolVersion ）来解决这个错误，但目前还不清楚我要选择哪个工具版本；我试过了jacoco
jacoco {
toolVersion "0.8.5"
}
但具有相同的错误结果。知道如何解决此错误吗？