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https://issues.apache.org/jira/browse/GROOVY-4214?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16616624#comment-16616624
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Hari Krishna Dara commented on GROOVY-4214:
-------------------------------------------
I just bumped into this same issue. I was trying to load another script and
have methods defined in the other script appear in the local script's
namespace, similar to the one in the description. I can verify that it works if
I copy methods individually, so this seems to be a bug in {{metaClass.mixin}}.
In the sample from description, instead of {{this.metaClass.mixin script}}, if
you copy individual methods, e.g., {{this.metaClass.say = script.&say}}, then
it would work fine. I got the below generalization to work, in case anyone is
looking for a workaround:
{noformat}
script.metaClass.methods.each {
if (it.declaringClass.getTheClass() == script.class && !
it.name.contains('$') && it.name != 'main' && it.name != 'run') {
this.metaClass."$it.name" = script.&"$it.name"
}
}
{noformat}
> StackOverflowError tyring to mixin loaded script
> ------------------------------------------------
>
> Key: GROOVY-4214
> URL: https://issues.apache.org/jira/browse/GROOVY-4214
> Project: Groovy
> Issue Type: Bug
> Components: groovy-runtime
> Reporter: Ittay Dror
> Priority: Major
> Labels: mixin
>
> In groovyConsole I have this:
> {code}
> import groovy.util.*
> import org.codehaus.groovy.runtime.*
> def gse = new GroovyScriptEngine("c:\\temp")
> def script = gse.loadScriptByName("say.groovy")
> this.metaClass.mixin script
> say("bye")
> {code}
> say.groovy contains
> {code}
> def say(String msg) {
> println(msg)
> }
> {code}
> I get:
> {noformat}
> java.lang.StackOverflowError
> at sun.reflect.GeneratedMethodAccessor548.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at
> org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:88)
> at
> org.codehaus.groovy.runtime.metaclass.MixinInstanceMetaMethod.invoke(MixinInstanceMetaMethod.java:38)
> at groovy.lang.ExpandoMetaClass.invokeMethod(ExpandoMetaClass.java:913)
> at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:886)
> at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:706)
> at
> org.codehaus.groovy.runtime.metaclass.OwnedMetaClass.invokeMethod(OwnedMetaClass.java:97)
> at
> groovy.lang.GroovyObjectSupport.invokeMethod(GroovyObjectSupport.java:44)
> at groovy.lang.Script.invokeMethod(Script.java:78)
> at sun.reflect.GeneratedMethodAccessor548.invoke(Unknown Source)
> ...
> {noformat}
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