FULL PRODUCT VERSION :
java version "1.8.0_121"
Java(TM) SE Runtime Environment (build 1.8.0_121-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.121-b13, mixed mode)
ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]
A DESCRIPTION OF THE PROBLEM :
For variables of a bound-type, where the type is multiply-bound eg. <E extends X & Y>, using method references for the second type does not produce the correct instantiedMethodType bootstrap method argument.
STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
# Run the test method of the following code after compiling with javac, using TestNG. Alternatively, the TestNG code can be removed, with the apply method being called directly.
package com.example;
import static java.util.Optional.ofNullable;
import static org.testng.Assert.assertEquals;
import java.util.function.Supplier;
import org.testng.annotations.Test;
public class MultiplyBoundMethodReferenceBug
{
public enum ValuedEnum implements Supplier<String>
{
ONE_HUNDRED( "100" );
private final String myValue;
private ValuedEnum( final String value )
{
myValue = value;
}
@Override
public String get()
{
return myValue;
}
}
private static <E extends Enum<E> & Supplier<?>> Object apply( final E e )
{
return ofNullable( e )
.map( Supplier::get )
.orElse( null );
}
@Test
public void test() throws Exception
{
assertEquals( apply( ValuedEnum.ONE_HUNDRED ), "100" );
}
}
EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Expected the test to pass.
Expected the following instantiated method type signature in the invokedynamic instruction generated for Supplier::get
(Ljava/util/function/Supplier;)Ljava/lang/Object;
ACTUAL -
Received the following stack trace:
java.lang.BootstrapMethodError: call site initialization exception
at java.lang.invoke.CallSite.makeSite(CallSite.java:341)
at java.lang.invoke.MethodHandleNatives.linkCallSiteImpl(MethodHandleNatives.java:307)
at java.lang.invoke.MethodHandleNatives.linkCallSite(MethodHandleNatives.java:297)
at com.example.MultiplyBoundMethodReferenceBug.apply(MultiplyBoundMethodReferenceBug.java:34)
at com.example.MultiplyBoundMethodReferenceBug.test(MultiplyBoundMethodReferenceBug.java:41)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:84)
at org.testng.internal.Invoker.invokeMethod(Invoker.java:714)
at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:901)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1231)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:127)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:111)
at org.testng.TestRunner.privateRun(TestRunner.java:767)
at org.testng.TestRunner.run(TestRunner.java:617)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:334)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:329)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:291)
at org.testng.SuiteRunner.run(SuiteRunner.java:240)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1224)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1149)
at org.testng.TestNG.run(TestNG.java:1057)
at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:132)
at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:236)
at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:81)
Caused by: java.lang.invoke.LambdaConversionException: Invalid receiver type class java.lang.Enum; not a subtype of implementation type interface java.util.function.Supplier
at java.lang.invoke.AbstractValidatingLambdaMetafactory.validateMetafactoryArgs(AbstractValidatingLambdaMetafactory.java:233)
at java.lang.invoke.LambdaMetafactory.metafactory(LambdaMetafactory.java:303)
at java.lang.invoke.CallSite.makeSite(CallSite.java:302)
... 28 more
Saw the following instantiated method type signature in the invokedynamic instruction generated for Supplier::get
(Ljava/lang/Enum;)Ljava/lang/Object;
ERROR MESSAGES/STACK TRACES THAT OCCUR :
java.lang.BootstrapMethodError: call site initialization exception
at java.lang.invoke.CallSite.makeSite(CallSite.java:341)
at java.lang.invoke.MethodHandleNatives.linkCallSiteImpl(MethodHandleNatives.java:307)
at java.lang.invoke.MethodHandleNatives.linkCallSite(MethodHandleNatives.java:297)
at com.example.MultiplyBoundMethodReferenceBug.apply(MultiplyBoundMethodReferenceBug.java:34)
at com.example.MultiplyBoundMethodReferenceBug.test(MultiplyBoundMethodReferenceBug.java:41)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:84)
at org.testng.internal.Invoker.invokeMethod(Invoker.java:714)
at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:901)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1231)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:127)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:111)
at org.testng.TestRunner.privateRun(TestRunner.java:767)
at org.testng.TestRunner.run(TestRunner.java:617)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:334)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:329)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:291)
at org.testng.SuiteRunner.run(SuiteRunner.java:240)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1224)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1149)
at org.testng.TestNG.run(TestNG.java:1057)
at org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:132)
at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:236)
at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:81)
Caused by: java.lang.invoke.LambdaConversionException: Invalid receiver type class java.lang.Enum; not a subtype of implementation type interface java.util.function.Supplier
at java.lang.invoke.AbstractValidatingLambdaMetafactory.validateMetafactoryArgs(AbstractValidatingLambdaMetafactory.java:233)
at java.lang.invoke.LambdaMetafactory.metafactory(LambdaMetafactory.java:303)
at java.lang.invoke.CallSite.makeSite(CallSite.java:302)
... 28 more
REPRODUCIBILITY :
This bug can be reproduced rarely.
---------- BEGIN SOURCE ----------
package com.example;
import static java.util.Optional.ofNullable;
import static org.testng.Assert.assertEquals;
import java.util.function.Supplier;
import org.testng.annotations.Test;
public class MultiplyBoundMethodReferenceBug
{
public enum ValuedEnum implements Supplier<String>
{
ONE_HUNDRED( "100" );
private final String myValue;
private ValuedEnum( final String value )
{
myValue = value;
}
@Override
public String get()
{
return myValue;
}
}
private static <E extends Enum<E> & Supplier<?>> Object apply( final E e )
{
return ofNullable( e )
.map( Supplier::get )
.orElse( null );
}
@Test
public void test() throws Exception
{
assertEquals( apply( ValuedEnum.ONE_HUNDRED ), "100" );
}
}
---------- END SOURCE ----------