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https://issues.apache.org/jira/browse/GROOVY-8499?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16390470#comment-16390470
]
Daniel Sun commented on GROOVY-8499:
------------------------------------
As the following test shows, multiple parameters should have been supported...
[https://github.com/apache/groovy/blob/master/src/test/groovy/transform/stc/LambdaTest.groovy#L72]
{code:java}
import groovy.transform.CompileStatic
import java.util.stream.Collectors
import java.util.stream.Stream
@CompileStatic
public class Test1 {
public static void main(String[] args) {
p();
}
public static void p() {
assert 13 == [1, 2, 3].stream().reduce(7, (Integer r, Integer
e) -> r + e);
}
}
{code}
> Glitch with native lambda support possibly relating to multiple params
> ----------------------------------------------------------------------
>
> Key: GROOVY-8499
> URL: https://issues.apache.org/jira/browse/GROOVY-8499
> Project: Groovy
> Issue Type: Bug
> Affects Versions: 3.x
> Reporter: Paul King
> Priority: Major
>
> The following code works:
> {code}
> import groovy.transform.*
> @CompileStatic
> def method() {
> ['ab'.chars, '12'.chars].combinations().collect{x, y -> "$x$y"}.each{
> println it }
> }
> method()
> {code}
> but the lambda equivalent doesn't:
> {code}
> import groovy.transform.*
> @CompileStatic
> def method() {
> ['ab'.chars, '12'.chars].combinations().stream().map((x, y) ->
> "$x$y").forEach{ println it }
> }
> method()
> {code}
> giving the following error:
> {noformat}
> Exception thrown
> 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 ConsoleScript33.method(ConsoleScript33:5)
> at ConsoleScript33.run(ConsoleScript33:9)
> at
> groovy.lang.GroovyShell.runScriptOrMainOrTestOrRunnable(GroovyShell.java:265)
> at groovy.lang.GroovyShell.run(GroovyShell.java:378)
> at groovy.lang.GroovyShell.run(GroovyShell.java:357)
> at groovy.lang.GroovyShell.run(GroovyShell.java:173)
> at groovy.lang.GroovyShell$run$0.call(Unknown Source)
> at
> groovy.ui.Console$_runScriptImpl_closure18.doCall(Console.groovy:1118)
> at groovy.ui.Console$_runScriptImpl_closure18.doCall(Console.groovy)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:103)
> at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
> at
> org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:264)
> at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1037)
> at groovy.lang.Closure.call(Closure.java:419)
> at groovy.lang.Closure.call(Closure.java:413)
> at groovy.lang.Closure.run(Closure.java:500)
> at java.lang.Thread.run(Thread.java:748)
> Caused by: java.lang.invoke.LambdaConversionException: Incorrect number of
> parameters for instance method invokeVirtual
> ConsoleScript33$_method_lambda1.doCall:(ConsoleScript33,Object,Object)Object;
> 2 captured parameters, 1 functional interface method parameters, 3
> implementation parameters
> at
> java.lang.invoke.AbstractValidatingLambdaMetafactory.validateMetafactoryArgs(AbstractValidatingLambdaMetafactory.java:193)
> at
> java.lang.invoke.LambdaMetafactory.metafactory(LambdaMetafactory.java:303)
> at java.lang.invoke.CallSite.makeSite(CallSite.java:302)
> ... 23 more
> {noformat}
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