不明确的规则定义了“T …”的类型
以下测试之一不起作用。 为什么？
public class SortedInterfacesTest { private static final Logger log = LoggerFactory.getLogger(SortedInterfacesTest.class); void forAll(Consumer consumer, T... values) { } @Test public void firstTest() { forAll(Shape::draw, new MyShape(), new Universal()); } @Test public void secondTest() { log.info("\njava.version {}", System.getProperty("java.version")); forAll(Picture::draw, new MyPicture(), new Universal()); } interface Shape { void draw(); } interface Marker { } interface Picture { void draw(); } class MyShape implements Marker, Shape { public void draw() {} } class MyPicture implements Marker, Picture { public void draw() {} } class Universal implements Marker, Picture, Shape { public void draw() {} } } 毕竟，一对Shape和MyShape是一对对称的Picture和MyPicture。
第二次测试失败，出现以下错误（使用cli：mvn.exe test）：
------------------------------------------------------- TESTS (Java.version: 1.8.0_102) ------------------------------------------------------- Running SortedInterfacesTest 01:36:28.234 [main] INFO SortedInterfacesTest - java.version 1.8.0_102 Tests run: 2, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.223 sec <<< FAILURE! secondTest(SortedInterfacesTest) Time elapsed: 0.009 sec <<< ERROR! java.lang.BootstrapMethodError: call site initialization exception at java.lang.invoke.CallSite.makeSite(Unknown Source) at java.lang.invoke.MethodHandleNatives.linkCallSiteImpl(Unknown Source) at java.lang.invoke.MethodHandleNatives.linkCallSite(Unknown Source) at SortedInterfacesTest.secondTest(SortedInterfacesTest.java:18)
Java 9 + 181上的Stacktrace：
java.lang.BootstrapMethodError: call site initialization exception at java.base/java.lang.invoke.CallSite.makeSite(CallSite.java:385) at java.base/java.lang.invoke.MethodHandleNatives.linkCallSiteImpl(MethodHandleNatives.java:250) at java.base/java.lang.invoke.MethodHandleNatives.linkCallSite(MethodHandleNatives.java:240) at play.Play.firstTest(Play.java:12) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:564) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) at org.junit.runners.ParentRunner.run(ParentRunner.java:363) at org.junit.runner.JUnitCore.run(JUnitCore.java:137) at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68) at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47) at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242) at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70) Caused by: java.lang.invoke.LambdaConversionException: Invalid receiver type interface play.Play$Marker; not a subtype of implementation type interface play.Play$Shape at java.base/java.lang.invoke.AbstractValidatingLambdaMetafactory.validateMetafactoryArgs(AbstractValidatingLambdaMetafactory.java:254) at java.base/java.lang.invoke.LambdaMetafactory.metafactory(LambdaMetafactory.java:311) at java.base/java.lang.invoke.CallSite.makeSite(CallSite.java:332) ... 25 more
一个新的错误已被注册为JDK-8191655。 解决方法：使用普通的lambda表达式而不是方法引用。