-
Bug
-
Resolution: Unresolved
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P4
-
11, 15, 16, 17, 18
A DESCRIPTION OF THE PROBLEM :
Intersection types and different order of supertypes in type parameters cause incorrect bootstrap method parameters generated.
STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile and execute the provided code example.
EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Code compiles without errors and prints "null" (or a compilation error is reported).
ACTUAL -
Exception in thread "main" java.lang.BootstrapMethodError: bootstrap method initialization exception
at java.base/java.lang.invoke.BootstrapMethodInvoker.invoke(BootstrapMethodInvoker.java:194)
at java.base/java.lang.invoke.CallSite.makeSite(CallSite.java:307)
at java.base/java.lang.invoke.MethodHandleNatives.linkCallSiteImpl(MethodHandleNatives.java:258)
at java.base/java.lang.invoke.MethodHandleNatives.linkCallSite(MethodHandleNatives.java:248)
at j.Test.test(Test.java:23)
at j.Test.main(Test.java:27)
Caused by: java.lang.invoke.LambdaConversionException: Type mismatch for instantiated parameter 0: interface j.Test$X is not a subtype of interface j.Test$Y
at java.base/java.lang.invoke.AbstractValidatingLambdaMetafactory.checkDescriptor(AbstractValidatingLambdaMetafactory.java:308)
at java.base/java.lang.invoke.AbstractValidatingLambdaMetafactory.validateMetafactoryArgs(AbstractValidatingLambdaMetafactory.java:294)
at java.base/java.lang.invoke.LambdaMetafactory.metafactory(LambdaMetafactory.java:328)
at java.base/java.lang.invoke.BootstrapMethodInvoker.invoke(BootstrapMethodInvoker.java:127)
... 5 more
---------- BEGIN SOURCE ----------
package j;
public class Test {
interface X {}
interface Y {}
interface A extends X, Y {}
interface B extends X, Y {}
interface IFoo<T extends Y & X> {
void foo(T x);
}
static <T> T sel(T a, T b) { return a; }
static class G<T extends X & Y> {
void check(IFoo<? extends T> foo) {
foo.foo(null);
}
}
static void test(G<A> ga, G<B> gb) {
sel(ga, gb).check(v -> System.out.println(v));
}
public static void main(String[] args) {
test(new G<>(), new G<>());
}
}
---------- END SOURCE ----------
FREQUENCY : always
Intersection types and different order of supertypes in type parameters cause incorrect bootstrap method parameters generated.
STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile and execute the provided code example.
EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Code compiles without errors and prints "null" (or a compilation error is reported).
ACTUAL -
Exception in thread "main" java.lang.BootstrapMethodError: bootstrap method initialization exception
at java.base/java.lang.invoke.BootstrapMethodInvoker.invoke(BootstrapMethodInvoker.java:194)
at java.base/java.lang.invoke.CallSite.makeSite(CallSite.java:307)
at java.base/java.lang.invoke.MethodHandleNatives.linkCallSiteImpl(MethodHandleNatives.java:258)
at java.base/java.lang.invoke.MethodHandleNatives.linkCallSite(MethodHandleNatives.java:248)
at j.Test.test(Test.java:23)
at j.Test.main(Test.java:27)
Caused by: java.lang.invoke.LambdaConversionException: Type mismatch for instantiated parameter 0: interface j.Test$X is not a subtype of interface j.Test$Y
at java.base/java.lang.invoke.AbstractValidatingLambdaMetafactory.checkDescriptor(AbstractValidatingLambdaMetafactory.java:308)
at java.base/java.lang.invoke.AbstractValidatingLambdaMetafactory.validateMetafactoryArgs(AbstractValidatingLambdaMetafactory.java:294)
at java.base/java.lang.invoke.LambdaMetafactory.metafactory(LambdaMetafactory.java:328)
at java.base/java.lang.invoke.BootstrapMethodInvoker.invoke(BootstrapMethodInvoker.java:127)
... 5 more
---------- BEGIN SOURCE ----------
package j;
public class Test {
interface X {}
interface Y {}
interface A extends X, Y {}
interface B extends X, Y {}
interface IFoo<T extends Y & X> {
void foo(T x);
}
static <T> T sel(T a, T b) { return a; }
static class G<T extends X & Y> {
void check(IFoo<? extends T> foo) {
foo.foo(null);
}
}
static void test(G<A> ga, G<B> gb) {
sel(ga, gb).check(v -> System.out.println(v));
}
public static void main(String[] args) {
test(new G<>(), new G<>());
}
}
---------- END SOURCE ----------
FREQUENCY : always
- blocks
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JDK-8269121 Type inference bug with method references
- Open
- relates to
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JDK-8174983 LambdaMetafactory: standardize supported type conversions
- In Progress