[GROOVY-10933] Bootstrap Method Error on non-void lambda for Consumer

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.0.9
• Fix Version/s: 3.0.16, 4.0.10
• Component/s: Static compilation
• Assignee: Eric Milles
• Reporter: Christopher Smith
• Created: 13/Feb/23 21:19
• Updated: 13/Mar/23 12:14
• Resolved: 14/Feb/23 15:48

Description

When a method that returns a value is used as a Consumer, a runtime Error is produced.

class BugRepro extends Specification {
    def 'repro'() {
        expect:
        new Demo().run()
    }
}

@CompileStatic
class Demo {
    List<String> strings = []

    void run() {
        Optional.of('hello')
            .ifPresent(strings::add)
    }
}

Condition failed with Exception:

new Demo().run()
|          |
|          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 Demo.run(BugRepro.groovy:18)
|          	at BugRepro.repro(BugRepro.groovy:9)
|          Caused by: java.lang.invoke.LambdaConversionException: Type mismatch for lambda expected return: boolean is not convertible to void
|          	at java.base/java.lang.invoke.AbstractValidatingLambdaMetafactory.checkDescriptor(AbstractValidatingLambdaMetafactory.java:317)
|          	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
<Demo@18e8473e strings=[]>

	at BugRepro.repro(BugRepro.groovy:9)
Caused by: 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 Demo.run(BugRepro.groovy:18)
	... 1 more
Caused by: java.lang.invoke.LambdaConversionException: Type mismatch for lambda expected return: boolean is not convertible to void
	at java.base/java.lang.invoke.AbstractValidatingLambdaMetafactory.checkDescriptor(AbstractValidatingLambdaMetafactory.java:317)
	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