Anton Pryamostanov created GROOVY-8881:
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Summary: Inner class - qualified "this" reference cast exception
inside 2 closures
Key: GROOVY-8881
URL: https://issues.apache.org/jira/browse/GROOVY-8881
Project: Groovy
Issue Type: Bug
Components: Compiler, groovy-runtime
Reporter: Anton Pryamostanov
Let's consider the below example of qualified (Outer class) "this" reference
from within the Inner class, used inside a closure defined inside another
closure (2 layers of closures):
{code:java}
class OuterClass implements Runnable {
class InnerClass {
String bar() {
Closure closureOne = {
Closure closureTwo = {
OuterClass outerClassViaQualifiedThisReference =
OuterClass.this
return outerClassViaQualifiedThisReference
}
return closureTwo.call()
}
closureOne.call()
}
}
String toString() {
return "OuterClass"
}
void run() {
System.out.println(new InnerClass().bar())
}
}
{code}
It produces the below runtime exception:
{code}
java.lang.ClassCastException: OuterClass$InnerClass cannot be cast to
OuterClass$InnerClass$_bar_closure1
at
OuterClass$InnerClass$_bar_closure1$_closure2.doCall(ConsoleScript279:8)
at
OuterClass$InnerClass$_bar_closure1$_closure2.doCall(ConsoleScript279)
at OuterClass$InnerClass$_bar_closure1.doCall(ConsoleScript279:11)
at OuterClass$InnerClass$_bar_closure1.doCall(ConsoleScript279)
at OuterClass$InnerClass.bar(ConsoleScript279:13)
at OuterClass$InnerClass$bar.call(Unknown Source)
at OuterClass.run(ConsoleScript279:23)
{code}
However the below code runs fine (if only 1 closure is used):
{code:groovy}
class OuterClass implements Runnable {
class InnerClass {
String bar() {
Closure closureOne = {
//Closure closureTwo = {
OuterClass outerClassViaQualifiedThisReference =
OuterClass.this
return outerClassViaQualifiedThisReference
//}
//return closureTwo.call()
}
closureOne.call()
}
}
String toString() {
return "OuterClass"
}
void run() {
System.out.println(new InnerClass().bar())
}
}
{code}
*Expected result*:
Code should run in both cases without runtime exceptions and should output
"OuterClass".
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