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https://issues.apache.org/jira/browse/GROOVY-10746?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17601411#comment-17601411
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Eric Milles commented on GROOVY-10746:
--------------------------------------
I don't have a recreation script/project yet, so I am going to speculate a bit.
To make "super.keys()" work in dynamic groovy, it creates a MOP method
"super$n$keys()" in {{SortedProperties}}. The "n" is based on the distance
between {{SortedProperties}} and {{Object}}. Anyways, we have seen cases where
the "n" changes from release to release. You can use javap on your
{{SortedProperties.class}} to see which was chosen at compile time. The other
half of this is the selection of "keys()" or "super$n$keys()" in the
{{MetaMethodIndex}}. You can see in the debugger
{{MetaClassImpl#invokeMethod}} read the method index and pick from what's there
for "super.keys()" aka "invokeMethodOnSuper0(...)".
You can also put {{@groovy.transform.CompileStatic}} on your method which makes
the "super.keys()" method call to get static (aka compile-time) selection like
java provides.
> Calling method in Super class causes java.lang.StackOverflowError with Java
> 1.8
> -------------------------------------------------------------------------------
>
> Key: GROOVY-10746
> URL: https://issues.apache.org/jira/browse/GROOVY-10746
> Project: Groovy
> Issue Type: Bug
> Affects Versions: 2.5.17, 3.0.12, 4.0.4
> Reporter: Troy Harris
> Priority: Major
> Labels: StackOverflowError
>
> Consider the class SortedProperties below which extends java.util.Properties
> and overrides Properties.keys().
> {code:java}
> import java.util.Enumeration;
> import java.util.Collections;
> class SortedProperties extends Properties {
>
> @Override
> public synchronized Enumeration keys() {
> Enumeration keysEnum = super.keys();
> Vector keyList = new Vector();
> while(keysEnum.hasMoreElements()){
> keyList.add(keysEnum.nextElement());
> }
> Collections.sort(keyList);
> return keyList.elements();
> }
> } {code}
> In this scenario the Groovy class above is compiled with Groovy 3.0.12 and
> JDK 11 but using the flag "--release 1.8" for JDK 1.8 compatibility.
> Attempting to call the overridden keys() method from the following TestGroovy
> class (compiled the same way) will yield a StackOverflowException when
> running with Java 1.8. This error is not reproduceable when running with
> Java 11.
> {code:java}
> import java.util.Properties;
> public class TestGroovy {
> public static void main(String[] args) {
> SortedProperties properties = new SortedProperties();
> properties.setProperty("FirstName", "John");
> properties.setProperty("LastName", "Doe");
> properties.keys();
> }
> } {code}
> Truncated Stacktrace:
> {noformat}
> Exception in thread "main" java.lang.StackOverflowError
> at
> org.codehaus.groovy.runtime.metaclass.MetaMethodIndex.getMethods(MetaMethodIndex.java:210)
> at
> groovy.lang.MetaClassImpl.getMethodWithCaching(MetaClassImpl.java:1371)
> at groovy.lang.MetaClassImpl.getMetaMethod(MetaClassImpl.java:1280)
> at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1132)
> at
> org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuperN(ScriptBytecodeAdapter.java:144)
> at
> org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuper0(ScriptBytecodeAdapter.java:164)
> at com.foo.SortedProperties.keys(SortedProperties.groovy:12)
> at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
> 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:107)
> at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:323)
> at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1268)
> at
> org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuperN(ScriptBytecodeAdapter.java:144)
> at
> org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuper0(ScriptBytecodeAdapter.java:164)
> at com.foo.SortedProperties.keys(SortedProperties.groovy:12)
> at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
> 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:107)
> at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:323)
> at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1268)
> at
> org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuperN(ScriptBytecodeAdapter.java:144)
> at
> org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodOnSuper0(ScriptBytecodeAdapter.java:164)
> at com.foo.SortedProperties.keys(SortedProperties.groovy:12){noformat}
>
>
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